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third-party-mirror / systemd / refs/heads/master / . / src / partition / repart.c
blob: 99e7d3cbba241d7df93812ce194cc5cdedc23434 [file] [log] [blame]
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#if HAVE_VALGRIND_MEMCHECK_H
#include <valgrind/memcheck.h>
#endif
#include <fcntl.h>
#include <getopt.h>
#include <linux/fs.h>
#include <linux/loop.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include "sd-device.h"
#include "sd-id128.h"
#include "alloc-util.h"
#include "blkid-util.h"
#include "blockdev-util.h"
#include "btrfs-util.h"
#include "build.h"
#include "chase-symlinks.h"
#include "conf-files.h"
#include "conf-parser.h"
#include "constants.h"
#include "cryptsetup-util.h"
#include "device-util.h"
#include "devnum-util.h"
#include "dirent-util.h"
#include "efivars.h"
#include "errno-util.h"
#include "fd-util.h"
#include "fdisk-util.h"
#include "fileio.h"
#include "format-table.h"
#include "format-util.h"
#include "fs-util.h"
#include "glyph-util.h"
#include "gpt.h"
#include "hexdecoct.h"
#include "hmac.h"
#include "id128-util.h"
#include "initrd-util.h"
#include "io-util.h"
#include "json.h"
#include "list.h"
#include "loop-util.h"
#include "main-func.h"
#include "mkdir.h"
#include "mkfs-util.h"
#include "mount-util.h"
#include "mountpoint-util.h"
#include "nulstr-util.h"
#include "openssl-util.h"
#include "parse-argument.h"
#include "parse-helpers.h"
#include "pretty-print.h"
#include "proc-cmdline.h"
#include "process-util.h"
#include "random-util.h"
#include "resize-fs.h"
#include "rm-rf.h"
#include "sort-util.h"
#include "specifier.h"
#include "stdio-util.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"
#include "sync-util.h"
#include "tmpfile-util.h"
#include "terminal-util.h"
#include "tpm-pcr.h"
#include "tpm2-util.h"
#include "user-util.h"
#include "utf8.h"
/* If not configured otherwise use a minimal partition size of 10M */
#define DEFAULT_MIN_SIZE (10ULL*1024ULL*1024ULL)
/* Hard lower limit for new partition sizes */
#define HARD_MIN_SIZE 4096ULL
/* We know up front we're never going to put more than this in a verity sig partition. */
#define VERITY_SIG_SIZE (HARD_MIN_SIZE*4ULL)
/* libfdisk takes off slightly more than 1M of the disk size when creating a GPT disk label */
#define GPT_METADATA_SIZE (1044ULL*1024ULL)
/* LUKS2 takes off 16M of the partition size with its metadata by default */
#define LUKS2_METADATA_SIZE (16ULL*1024ULL*1024ULL)
/* To do LUKS2 offline encryption, we need to keep some extra free space at the end of the partition. */
#define LUKS2_METADATA_KEEP_FREE (LUKS2_METADATA_SIZE*2ULL)
/* LUKS2 volume key size. */
#define VOLUME_KEY_SIZE (512ULL/8ULL)
/* Note: When growing and placing new partitions we always align to 4K sector size. It's how newer hard disks
* are designed, and if everything is aligned to that performance is best. And for older hard disks with 512B
* sector size devices were generally assumed to have an even number of sectors, hence at the worst we'll
* waste 3K per partition, which is probably fine. */
static enum {
EMPTY_REFUSE, /* refuse empty disks, never create a partition table */
EMPTY_ALLOW, /* allow empty disks, create partition table if necessary */
EMPTY_REQUIRE, /* require an empty disk, create a partition table */
EMPTY_FORCE, /* make disk empty, erase everything, create a partition table always */
EMPTY_CREATE, /* create disk as loopback file, create a partition table always */
} arg_empty = EMPTY_REFUSE;
typedef enum FilterPartitionType {
FILTER_PARTITIONS_NONE,
FILTER_PARTITIONS_EXCLUDE,
FILTER_PARTITIONS_INCLUDE,
_FILTER_PARTITIONS_MAX,
_FILTER_PARTITIONS_INVALID = -EINVAL,
} FilterPartitionsType;
static bool arg_dry_run = true;
static const char *arg_node = NULL;
static char *arg_root = NULL;
static char *arg_image = NULL;
static char **arg_definitions = NULL;
static bool arg_discard = true;
static bool arg_can_factory_reset = false;
static int arg_factory_reset = -1;
static sd_id128_t arg_seed = SD_ID128_NULL;
static bool arg_randomize = false;
static int arg_pretty = -1;
static uint64_t arg_size = UINT64_MAX;
static bool arg_size_auto = false;
static JsonFormatFlags arg_json_format_flags = JSON_FORMAT_OFF;
static PagerFlags arg_pager_flags = 0;
static bool arg_legend = true;
static void *arg_key = NULL;
static size_t arg_key_size = 0;
static EVP_PKEY *arg_private_key = NULL;
static X509 *arg_certificate = NULL;
static char *arg_tpm2_device = NULL;
static uint32_t arg_tpm2_pcr_mask = UINT32_MAX;
static char *arg_tpm2_public_key = NULL;
static uint32_t arg_tpm2_public_key_pcr_mask = UINT32_MAX;
static bool arg_split = false;
static sd_id128_t *arg_filter_partitions = NULL;
static size_t arg_n_filter_partitions = 0;
static FilterPartitionsType arg_filter_partitions_type = FILTER_PARTITIONS_NONE;
static sd_id128_t *arg_defer_partitions = NULL;
static size_t arg_n_defer_partitions = 0;
static uint64_t arg_sector_size = 0;
STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
STATIC_DESTRUCTOR_REGISTER(arg_definitions, strv_freep);
STATIC_DESTRUCTOR_REGISTER(arg_key, erase_and_freep);
STATIC_DESTRUCTOR_REGISTER(arg_private_key, EVP_PKEY_freep);
STATIC_DESTRUCTOR_REGISTER(arg_certificate, X509_freep);
STATIC_DESTRUCTOR_REGISTER(arg_tpm2_device, freep);
STATIC_DESTRUCTOR_REGISTER(arg_tpm2_public_key, freep);
STATIC_DESTRUCTOR_REGISTER(arg_filter_partitions, freep);
typedef struct FreeArea FreeArea;
typedef enum EncryptMode {
ENCRYPT_OFF,
ENCRYPT_KEY_FILE,
ENCRYPT_TPM2,
ENCRYPT_KEY_FILE_TPM2,
_ENCRYPT_MODE_MAX,
_ENCRYPT_MODE_INVALID = -EINVAL,
} EncryptMode;
typedef enum VerityMode {
VERITY_OFF,
VERITY_DATA,
VERITY_HASH,
VERITY_SIG,
_VERITY_MODE_MAX,
_VERITY_MODE_INVALID = -EINVAL,
} VerityMode;
typedef enum MinimizeMode {
MINIMIZE_OFF,
MINIMIZE_BEST,
MINIMIZE_GUESS,
_MINIMIZE_MODE_MAX,
_MINIMIZE_MODE_INVALID = -EINVAL,
} MinimizeMode;
typedef struct Partition {
char *definition_path;
char **drop_in_files;
GptPartitionType type;
sd_id128_t current_uuid, new_uuid;
bool new_uuid_is_set;
char *current_label, *new_label;
sd_id128_t fs_uuid, luks_uuid;
bool dropped;
bool factory_reset;
int32_t priority;
uint32_t weight, padding_weight;
uint64_t current_size, new_size;
uint64_t size_min, size_max;
uint64_t current_padding, new_padding;
uint64_t padding_min, padding_max;
uint64_t partno;
uint64_t offset;
struct fdisk_partition *current_partition;
struct fdisk_partition *new_partition;
FreeArea *padding_area;
FreeArea *allocated_to_area;
char *copy_blocks_path;
bool copy_blocks_path_is_our_file;
bool copy_blocks_auto;
const char *copy_blocks_root;
int copy_blocks_fd;
uint64_t copy_blocks_size;
char *format;
char **copy_files;
char **make_directories;
EncryptMode encrypt;
VerityMode verity;
char *verity_match_key;
MinimizeMode minimize;
uint64_t gpt_flags;
int no_auto;
int read_only;
int growfs;
uint8_t *roothash;
size_t roothash_size;
char *split_name_format;
char *split_path;
struct Partition *siblings[_VERITY_MODE_MAX];
LIST_FIELDS(struct Partition, partitions);
} Partition;
#define PARTITION_IS_FOREIGN(p) (!(p)->definition_path)
#define PARTITION_EXISTS(p) (!!(p)->current_partition)
struct FreeArea {
Partition *after;
uint64_t size;
uint64_t allocated;
};
typedef struct Context {
LIST_HEAD(Partition, partitions);
size_t n_partitions;
FreeArea **free_areas;
size_t n_free_areas;
uint64_t start, end, total;
struct fdisk_context *fdisk_context;
uint64_t sector_size;
uint64_t grain_size;
sd_id128_t seed;
char *node;
bool node_is_our_file;
int backing_fd;
bool from_scratch;
} Context;
static const char *encrypt_mode_table[_ENCRYPT_MODE_MAX] = {
[ENCRYPT_OFF] = "off",
[ENCRYPT_KEY_FILE] = "key-file",
[ENCRYPT_TPM2] = "tpm2",
[ENCRYPT_KEY_FILE_TPM2] = "key-file+tpm2",
};
static const char *verity_mode_table[_VERITY_MODE_MAX] = {
[VERITY_OFF] = "off",
[VERITY_DATA] = "data",
[VERITY_HASH] = "hash",
[VERITY_SIG] = "signature",
};
static const char *minimize_mode_table[_MINIMIZE_MODE_MAX] = {
[MINIMIZE_OFF] = "off",
[MINIMIZE_BEST] = "best",
[MINIMIZE_GUESS] = "guess",
};
DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING_WITH_BOOLEAN(encrypt_mode, EncryptMode, ENCRYPT_KEY_FILE);
DEFINE_PRIVATE_STRING_TABLE_LOOKUP(verity_mode, VerityMode);
DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING_WITH_BOOLEAN(minimize_mode, MinimizeMode, MINIMIZE_BEST);
static uint64_t round_down_size(uint64_t v, uint64_t p) {
return (v / p) * p;
}
static uint64_t round_up_size(uint64_t v, uint64_t p) {
v = DIV_ROUND_UP(v, p);
if (v > UINT64_MAX / p)
return UINT64_MAX; /* overflow */
return v * p;
}
static Partition *partition_new(void) {
Partition *p;
p = new(Partition, 1);
if (!p)
return NULL;
*p = (Partition) {
.weight = 1000,
.padding_weight = 0,
.current_size = UINT64_MAX,
.new_size = UINT64_MAX,
.size_min = UINT64_MAX,
.size_max = UINT64_MAX,
.current_padding = UINT64_MAX,
.new_padding = UINT64_MAX,
.padding_min = UINT64_MAX,
.padding_max = UINT64_MAX,
.partno = UINT64_MAX,
.offset = UINT64_MAX,
.copy_blocks_fd = -EBADF,
.copy_blocks_size = UINT64_MAX,
.no_auto = -1,
.read_only = -1,
.growfs = -1,
};
return p;
}
static Partition* partition_free(Partition *p) {
if (!p)
return NULL;
free(p->current_label);
free(p->new_label);
free(p->definition_path);
strv_free(p->drop_in_files);
if (p->current_partition)
fdisk_unref_partition(p->current_partition);
if (p->new_partition)
fdisk_unref_partition(p->new_partition);
if (p->copy_blocks_path_is_our_file)
unlink_and_free(p->copy_blocks_path);
else
free(p->copy_blocks_path);
safe_close(p->copy_blocks_fd);
free(p->format);
strv_free(p->copy_files);
strv_free(p->make_directories);
free(p->verity_match_key);
free(p->roothash);
free(p->split_name_format);
unlink_and_free(p->split_path);
return mfree(p);
}
static void partition_foreignize(Partition *p) {
assert(p);
assert(PARTITION_EXISTS(p));
/* Reset several parameters set through definition file to make the partition foreign. */
p->definition_path = mfree(p->definition_path);
p->drop_in_files = strv_free(p->drop_in_files);
p->copy_blocks_path = mfree(p->copy_blocks_path);
p->copy_blocks_fd = safe_close(p->copy_blocks_fd);
p->copy_blocks_root = NULL;
p->format = mfree(p->format);
p->copy_files = strv_free(p->copy_files);
p->make_directories = strv_free(p->make_directories);
p->verity_match_key = mfree(p->verity_match_key);
p->priority = 0;
p->weight = 1000;
p->padding_weight = 0;
p->size_min = UINT64_MAX;
p->size_max = UINT64_MAX;
p->padding_min = UINT64_MAX;
p->padding_max = UINT64_MAX;
p->no_auto = -1;
p->read_only = -1;
p->growfs = -1;
p->verity = VERITY_OFF;
}
static bool partition_exclude(const Partition *p) {
assert(p);
if (arg_filter_partitions_type == FILTER_PARTITIONS_NONE)
return false;
for (size_t i = 0; i < arg_n_filter_partitions; i++)
if (sd_id128_equal(p->type.uuid, arg_filter_partitions[i]))
return arg_filter_partitions_type == FILTER_PARTITIONS_EXCLUDE;
return arg_filter_partitions_type == FILTER_PARTITIONS_INCLUDE;
}
static bool partition_defer(const Partition *p) {
assert(p);
for (size_t i = 0; i < arg_n_defer_partitions; i++)
if (sd_id128_equal(p->type.uuid, arg_defer_partitions[i]))
return true;
return false;
}
static Partition* partition_unlink_and_free(Context *context, Partition *p) {
if (!p)
return NULL;
LIST_REMOVE(partitions, context->partitions, p);
assert(context->n_partitions > 0);
context->n_partitions--;
return partition_free(p);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(Partition*, partition_free);
static Context *context_new(sd_id128_t seed) {
Context *context;
context = new(Context, 1);
if (!context)
return NULL;
*context = (Context) {
.start = UINT64_MAX,
.end = UINT64_MAX,
.total = UINT64_MAX,
.seed = seed,
};
return context;
}
static void context_free_free_areas(Context *context) {
assert(context);
for (size_t i = 0; i < context->n_free_areas; i++)
free(context->free_areas[i]);
context->free_areas = mfree(context->free_areas);
context->n_free_areas = 0;
}
static Context *context_free(Context *context) {
if (!context)
return NULL;
while (context->partitions)
partition_unlink_and_free(context, context->partitions);
assert(context->n_partitions == 0);
context_free_free_areas(context);
if (context->fdisk_context)
fdisk_unref_context(context->fdisk_context);
safe_close(context->backing_fd);
if (context->node_is_our_file)
unlink_and_free(context->node);
else
free(context->node);
return mfree(context);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(Context*, context_free);
static int context_add_free_area(
Context *context,
uint64_t size,
Partition *after) {
FreeArea *a;
assert(context);
assert(!after || !after->padding_area);
if (!GREEDY_REALLOC(context->free_areas, context->n_free_areas + 1))
return -ENOMEM;
a = new(FreeArea, 1);
if (!a)
return -ENOMEM;
*a = (FreeArea) {
.size = size,
.after = after,
};
context->free_areas[context->n_free_areas++] = a;
if (after)
after->padding_area = a;
return 0;
}
static void partition_drop_or_foreignize(Partition *p) {
if (!p || p->dropped || PARTITION_IS_FOREIGN(p))
return;
if (PARTITION_EXISTS(p)) {
log_info("Can't grow existing partition %s of priority %" PRIi32 ", ignoring.",
strna(p->current_label ?: p->new_label), p->priority);
/* Handle the partition as foreign. Do not set dropped flag. */
partition_foreignize(p);
} else {
log_info("Can't fit partition %s of priority %" PRIi32 ", dropping.",
p->definition_path, p->priority);
p->dropped = true;
p->allocated_to_area = NULL;
}
}
static bool context_drop_or_foreignize_one_priority(Context *context) {
int32_t priority = 0;
LIST_FOREACH(partitions, p, context->partitions) {
if (p->dropped)
continue;
priority = MAX(priority, p->priority);
}
/* Refuse to drop partitions with 0 or negative priorities or partitions of priorities that have at
* least one existing priority */
if (priority <= 0)
return false;
LIST_FOREACH(partitions, p, context->partitions) {
if (p->priority < priority)
continue;
partition_drop_or_foreignize(p);
/* We ensure that all verity sibling partitions have the same priority, so it's safe
* to drop all siblings here as well. */
for (VerityMode mode = VERITY_OFF + 1; mode < _VERITY_MODE_MAX; mode++)
partition_drop_or_foreignize(p->siblings[mode]);
}
return true;
}
static uint64_t partition_min_size(const Context *context, const Partition *p) {
uint64_t sz;
assert(context);
assert(p);
/* Calculate the disk space we really need at minimum for this partition. If the partition already
* exists the current size is what we really need. If it doesn't exist yet refuse to allocate less
* than 4K.
*
* DEFAULT_MIN_SIZE is the default SizeMin= we configure if nothing else is specified. */
if (PARTITION_IS_FOREIGN(p)) {
/* Don't allow changing size of partitions not managed by us */
assert(p->current_size != UINT64_MAX);
return p->current_size;
}
if (p->verity == VERITY_SIG)
return VERITY_SIG_SIZE;
sz = p->current_size != UINT64_MAX ? p->current_size : HARD_MIN_SIZE;
if (!PARTITION_EXISTS(p)) {
uint64_t d = 0;
if (p->encrypt != ENCRYPT_OFF)
d += round_up_size(LUKS2_METADATA_KEEP_FREE, context->grain_size);
if (p->copy_blocks_size != UINT64_MAX)
d += round_up_size(p->copy_blocks_size, context->grain_size);
else if (p->format || p->encrypt != ENCRYPT_OFF) {
uint64_t f;
/* If we shall synthesize a file system, take minimal fs size into account (assumed to be 4K if not known) */
f = p->format ? round_up_size(minimal_size_by_fs_name(p->format), context->grain_size) : UINT64_MAX;
d += f == UINT64_MAX ? context->grain_size : f;
}
if (d > sz)
sz = d;
}
return MAX(round_up_size(p->size_min != UINT64_MAX ? p->size_min : DEFAULT_MIN_SIZE, context->grain_size), sz);
}
static uint64_t partition_max_size(const Context *context, const Partition *p) {
uint64_t sm;
/* Calculate how large the partition may become at max. This is generally the configured maximum
* size, except when it already exists and is larger than that. In that case it's the existing size,
* since we never want to shrink partitions. */
assert(context);
assert(p);
if (PARTITION_IS_FOREIGN(p)) {
/* Don't allow changing size of partitions not managed by us */
assert(p->current_size != UINT64_MAX);
return p->current_size;
}
if (p->verity == VERITY_SIG)
return VERITY_SIG_SIZE;
if (p->size_max == UINT64_MAX)
return UINT64_MAX;
sm = round_down_size(p->size_max, context->grain_size);
if (p->current_size != UINT64_MAX)
sm = MAX(p->current_size, sm);
return MAX(partition_min_size(context, p), sm);
}
static uint64_t partition_min_padding(const Partition *p) {
assert(p);
return p->padding_min != UINT64_MAX ? p->padding_min : 0;
}
static uint64_t partition_max_padding(const Partition *p) {
assert(p);
return p->padding_max;
}
static uint64_t partition_min_size_with_padding(Context *context, const Partition *p) {
uint64_t sz;
/* Calculate the disk space we need for this partition plus any free space coming after it. This
* takes user configured padding into account as well as any additional whitespace needed to align
* the next partition to 4K again. */
assert(context);
assert(p);
sz = partition_min_size(context, p) + partition_min_padding(p);
if (PARTITION_EXISTS(p)) {
/* If the partition wasn't aligned, add extra space so that any we might add will be aligned */
assert(p->offset != UINT64_MAX);
return round_up_size(p->offset + sz, context->grain_size) - p->offset;
}
/* If this is a new partition we'll place it aligned, hence we just need to round up the required size here */
return round_up_size(sz, context->grain_size);
}
static uint64_t free_area_available(const FreeArea *a) {
assert(a);
/* Determines how much of this free area is not allocated yet */
assert(a->size >= a->allocated);
return a->size - a->allocated;
}
static uint64_t free_area_current_end(Context *context, const FreeArea *a) {
assert(context);
assert(a);
if (!a->after)
return free_area_available(a);
assert(a->after->offset != UINT64_MAX);
assert(a->after->current_size != UINT64_MAX);
/* Calculate where the free area ends, based on the offset of the partition preceding it. */
return round_up_size(a->after->offset + a->after->current_size, context->grain_size) + free_area_available(a);
}
static uint64_t free_area_min_end(Context *context, const FreeArea *a) {
assert(context);
assert(a);
if (!a->after)
return 0;
assert(a->after->offset != UINT64_MAX);
assert(a->after->current_size != UINT64_MAX);
/* Calculate where the partition would end when we give it as much as it needs. */
return round_up_size(a->after->offset + partition_min_size_with_padding(context, a->after), context->grain_size);
}
static uint64_t free_area_available_for_new_partitions(Context *context, const FreeArea *a) {
assert(context);
assert(a);
/* Similar to free_area_available(), but takes into account that the required size and padding of the
* preceding partition is honoured. */
return LESS_BY(free_area_current_end(context, a), free_area_min_end(context, a));
}
static int free_area_compare(FreeArea *const *a, FreeArea *const*b, Context *context) {
assert(context);
return CMP(free_area_available_for_new_partitions(context, *a),
free_area_available_for_new_partitions(context, *b));
}
static uint64_t charge_size(Context *context, uint64_t total, uint64_t amount) {
assert(context);
/* Subtract the specified amount from total, rounding up to multiple of 4K if there's room */
assert(amount <= total);
return LESS_BY(total, round_up_size(amount, context->grain_size));
}
static uint64_t charge_weight(uint64_t total, uint64_t amount) {
assert(amount <= total);
return total - amount;
}
static bool context_allocate_partitions(Context *context, uint64_t *ret_largest_free_area) {
assert(context);
/* This may be called multiple times. Reset previous assignments. */
for (size_t i = 0; i < context->n_free_areas; i++)
context->free_areas[i]->allocated = 0;
/* Sort free areas by size, putting smallest first */
typesafe_qsort_r(context->free_areas, context->n_free_areas, free_area_compare, context);
/* In any case return size of the largest free area (i.e. not the size of all free areas
* combined!) */
if (ret_largest_free_area)
*ret_largest_free_area =
context->n_free_areas == 0 ? 0 :
free_area_available_for_new_partitions(context, context->free_areas[context->n_free_areas-1]);
/* Check that each existing partition can fit its area. */
for (size_t i = 0; i < context->n_free_areas; i++)
if (free_area_current_end(context, context->free_areas[i]) <
free_area_min_end(context, context->free_areas[i]))
return false;
/* A simple first-fit algorithm. We return true if we can fit the partitions in, otherwise false. */
LIST_FOREACH(partitions, p, context->partitions) {
bool fits = false;
uint64_t required;
FreeArea *a = NULL;
/* Skip partitions we already dropped or that already exist */
if (p->dropped || PARTITION_EXISTS(p))
continue;
/* How much do we need to fit? */
required = partition_min_size_with_padding(context, p);
assert(required % context->grain_size == 0);
for (size_t i = 0; i < context->n_free_areas; i++) {
a = context->free_areas[i];
if (free_area_available_for_new_partitions(context, a) >= required) {
fits = true;
break;
}
}
if (!fits)
return false; /* 😢 Oh no! We can't fit this partition into any free area! */
/* Assign the partition to this free area */
p->allocated_to_area = a;
/* Budget the minimal partition size */
a->allocated += required;
}
return true;
}
static int context_sum_weights(Context *context, FreeArea *a, uint64_t *ret) {
uint64_t weight_sum = 0;
assert(context);
assert(a);
assert(ret);
/* Determine the sum of the weights of all partitions placed in or before the specified free area */
LIST_FOREACH(partitions, p, context->partitions) {
if (p->padding_area != a && p->allocated_to_area != a)
continue;
if (p->weight > UINT64_MAX - weight_sum)
goto overflow_sum;
weight_sum += p->weight;
if (p->padding_weight > UINT64_MAX - weight_sum)
goto overflow_sum;
weight_sum += p->padding_weight;
}
*ret = weight_sum;
return 0;
overflow_sum:
return log_error_errno(SYNTHETIC_ERRNO(EOVERFLOW), "Combined weight of partition exceeds unsigned 64bit range, refusing.");
}
static uint64_t scale_by_weight(uint64_t value, uint64_t weight, uint64_t weight_sum) {
assert(weight_sum >= weight);
for (;;) {
if (weight == 0)
return 0;
if (weight == weight_sum)
return value;
if (value <= UINT64_MAX / weight)
return value * weight / weight_sum;
/* Rescale weight and weight_sum to make not the calculation overflow. To satisfy the
* following conditions, 'weight_sum' is rounded up but 'weight' is rounded down:
* - the sum of scale_by_weight() for all weights must not be larger than the input value,
* - scale_by_weight() must not be larger than the ideal value (i.e. calculated with uint128_t). */
weight_sum = DIV_ROUND_UP(weight_sum, 2);
weight /= 2;
}
}
typedef enum GrowPartitionPhase {
/* The zeroth phase: do not touch foreign partitions (i.e. those we don't manage). */
PHASE_FOREIGN,
/* The first phase: we charge partitions which need more (according to constraints) than their weight-based share. */
PHASE_OVERCHARGE,
/* The second phase: we charge partitions which need less (according to constraints) than their weight-based share. */
PHASE_UNDERCHARGE,
/* The third phase: we distribute what remains among the remaining partitions, according to the weights */
PHASE_DISTRIBUTE,
_GROW_PARTITION_PHASE_MAX,
} GrowPartitionPhase;
static bool context_grow_partitions_phase(
Context *context,
FreeArea *a,
GrowPartitionPhase phase,
uint64_t *span,
uint64_t *weight_sum) {
bool try_again = false;
assert(context);
assert(a);
assert(span);
assert(weight_sum);
/* Now let's look at the intended weights and adjust them taking the minimum space assignments into
* account. i.e. if a partition has a small weight but a high minimum space value set it should not
* get any additional room from the left-overs. Similar, if two partitions have the same weight they
* should get the same space if possible, even if one has a smaller minimum size than the other. */
LIST_FOREACH(partitions, p, context->partitions) {
/* Look only at partitions associated with this free area, i.e. immediately
* preceding it, or allocated into it */
if (p->allocated_to_area != a && p->padding_area != a)
continue;
if (p->new_size == UINT64_MAX) {
uint64_t share, rsz, xsz;
bool charge = false;
/* Calculate how much this space this partition needs if everyone would get
* the weight based share */
share = scale_by_weight(*span, p->weight, *weight_sum);
rsz = partition_min_size(context, p);
xsz = partition_max_size(context, p);
if (phase == PHASE_FOREIGN && PARTITION_IS_FOREIGN(p)) {
/* Never change of foreign partitions (i.e. those we don't manage) */
p->new_size = p->current_size;
charge = true;
} else if (phase == PHASE_OVERCHARGE && rsz > share) {
/* This partition needs more than its calculated share. Let's assign
* it that, and take this partition out of all calculations and start
* again. */
p->new_size = rsz;
charge = try_again = true;
} else if (phase == PHASE_UNDERCHARGE && xsz < share) {
/* This partition accepts less than its calculated
* share. Let's assign it that, and take this partition out
* of all calculations and start again. */
p->new_size = xsz;
charge = try_again = true;
} else if (phase == PHASE_DISTRIBUTE) {
/* This partition can accept its calculated share. Let's
* assign it. There's no need to restart things here since
* assigning this shouldn't impact the shares of the other
* partitions. */
assert(share >= rsz);
p->new_size = CLAMP(round_down_size(share, context->grain_size), rsz, xsz);
charge = true;
}
if (charge) {
*span = charge_size(context, *span, p->new_size);
*weight_sum = charge_weight(*weight_sum, p->weight);
}
}
if (p->new_padding == UINT64_MAX) {
uint64_t share, rsz, xsz;
bool charge = false;
share = scale_by_weight(*span, p->padding_weight, *weight_sum);
rsz = partition_min_padding(p);
xsz = partition_max_padding(p);
if (phase == PHASE_OVERCHARGE && rsz > share) {
p->new_padding = rsz;
charge = try_again = true;
} else if (phase == PHASE_UNDERCHARGE && xsz < share) {
p->new_padding = xsz;
charge = try_again = true;
} else if (phase == PHASE_DISTRIBUTE) {
assert(share >= rsz);
p->new_padding = CLAMP(round_down_size(share, context->grain_size), rsz, xsz);
charge = true;
}
if (charge) {
*span = charge_size(context, *span, p->new_padding);
*weight_sum = charge_weight(*weight_sum, p->padding_weight);
}
}
}
return !try_again;
}
static void context_grow_partition_one(Context *context, FreeArea *a, Partition *p, uint64_t *span) {
uint64_t m;
assert(context);
assert(a);
assert(p);
assert(span);
if (*span == 0)
return;
if (p->allocated_to_area != a)
return;
if (PARTITION_IS_FOREIGN(p))
return;
assert(p->new_size != UINT64_MAX);
/* Calculate new size and align. */
m = round_down_size(p->new_size + *span, context->grain_size);
/* But ensure this doesn't shrink the size. */
m = MAX(m, p->new_size);
/* And ensure this doesn't exceed the maximum size. */
m = MIN(m, partition_max_size(context, p));
assert(m >= p->new_size);
*span = charge_size(context, *span, m - p->new_size);
p->new_size = m;
}
static int context_grow_partitions_on_free_area(Context *context, FreeArea *a) {
uint64_t weight_sum = 0, span;
int r;
assert(context);
assert(a);
r = context_sum_weights(context, a, &weight_sum);
if (r < 0)
return r;
/* Let's calculate the total area covered by this free area and the partition before it */
span = a->size;
if (a->after) {
assert(a->after->offset != UINT64_MAX);
assert(a->after->current_size != UINT64_MAX);
span += round_up_size(a->after->offset + a->after->current_size, context->grain_size) - a->after->offset;
}
for (GrowPartitionPhase phase = 0; phase < _GROW_PARTITION_PHASE_MAX;)
if (context_grow_partitions_phase(context, a, phase, &span, &weight_sum))
phase++; /* go to the next phase */
/* We still have space left over? Donate to preceding partition if we have one */
if (span > 0 && a->after)
context_grow_partition_one(context, a, a->after, &span);
/* What? Even still some space left (maybe because there was no preceding partition, or it had a
* size limit), then let's donate it to whoever wants it. */
if (span > 0)
LIST_FOREACH(partitions, p, context->partitions) {
context_grow_partition_one(context, a, p, &span);
if (span == 0)
break;
}
/* Yuck, still no one? Then make it padding */
if (span > 0 && a->after) {
assert(a->after->new_padding != UINT64_MAX);
a->after->new_padding += span;
}
return 0;
}
static int context_grow_partitions(Context *context) {
int r;
assert(context);
for (size_t i = 0; i < context->n_free_areas; i++) {
r = context_grow_partitions_on_free_area(context, context->free_areas[i]);
if (r < 0)
return r;
}
/* All existing partitions that have no free space after them can't change size */
LIST_FOREACH(partitions, p, context->partitions) {
if (p->dropped)
continue;
if (!PARTITION_EXISTS(p) || p->padding_area) {
/* The algorithm above must have initialized this already */
assert(p->new_size != UINT64_MAX);
continue;
}
assert(p->new_size == UINT64_MAX);
p->new_size = p->current_size;
assert(p->new_padding == UINT64_MAX);
p->new_padding = p->current_padding;
}
return 0;
}
static uint64_t find_first_unused_partno(Context *context) {
uint64_t partno = 0;
assert(context);
for (partno = 0;; partno++) {
bool found = false;
LIST_FOREACH(partitions, p, context->partitions)
if (p->partno != UINT64_MAX && p->partno == partno)
found = true;
if (!found)
break;
}
return partno;
}
static void context_place_partitions(Context *context) {
assert(context);
for (size_t i = 0; i < context->n_free_areas; i++) {
FreeArea *a = context->free_areas[i];
_unused_ uint64_t left;
uint64_t start;
if (a->after) {
assert(a->after->offset != UINT64_MAX);
assert(a->after->new_size != UINT64_MAX);
assert(a->after->new_padding != UINT64_MAX);
start = a->after->offset + a->after->new_size + a->after->new_padding;
} else
start = context->start;
start = round_up_size(start, context->grain_size);
left = a->size;
LIST_FOREACH(partitions, p, context->partitions) {
if (p->allocated_to_area != a)
continue;
p->offset = start;
p->partno = find_first_unused_partno(context);
assert(left >= p->new_size);
start += p->new_size;
left -= p->new_size;
assert(left >= p->new_padding);
start += p->new_padding;
left -= p->new_padding;
}
}
}
static int config_parse_type(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
GptPartitionType *type = ASSERT_PTR(data);
int r;
assert(rvalue);
r = gpt_partition_type_from_string(rvalue, type);
if (r < 0)
return log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse partition type: %s", rvalue);
return 0;
}
static int config_parse_label(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
_cleanup_free_ char *resolved = NULL;
char **label = ASSERT_PTR(data);
int r;
assert(rvalue);
/* Nota bene: the empty label is a totally valid one. Let's hence not follow our usual rule of
* assigning the empty string to reset to default here, but really accept it as label to set. */
r = specifier_printf(rvalue, GPT_LABEL_MAX, system_and_tmp_specifier_table, arg_root, NULL, &resolved);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to expand specifiers in Label=, ignoring: %s", rvalue);
return 0;
}
if (!utf8_is_valid(resolved)) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Partition label not valid UTF-8, ignoring: %s", rvalue);
return 0;
}
r = gpt_partition_label_valid(resolved);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to check if string is valid as GPT partition label, ignoring: \"%s\" (from \"%s\")",
resolved, rvalue);
return 0;
}
if (!r) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Partition label too long for GPT table, ignoring: \"%s\" (from \"%s\")",
resolved, rvalue);
return 0;
}
free_and_replace(*label, resolved);
return 0;
}
static int config_parse_weight(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
uint32_t *w = ASSERT_PTR(data), v;
int r;
assert(rvalue);
r = safe_atou32(rvalue, &v);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse weight value, ignoring: %s", rvalue);
return 0;
}
if (v > 1000U*1000U) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Weight needs to be in range 0…10000000, ignoring: %" PRIu32, v);
return 0;
}
*w = v;
return 0;
}
static int config_parse_size4096(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
uint64_t *sz = data, parsed;
int r;
assert(rvalue);
assert(data);
r = parse_size(rvalue, 1024, &parsed);
if (r < 0)
return log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to parse size value: %s", rvalue);
if (ltype > 0)
*sz = round_up_size(parsed, 4096);
else if (ltype < 0)
*sz = round_down_size(parsed, 4096);
else
*sz = parsed;
if (*sz != parsed)
log_syntax(unit, LOG_NOTICE, filename, line, r, "Rounded %s= size %" PRIu64 " %s %" PRIu64 ", a multiple of 4096.",
lvalue, parsed, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), *sz);
return 0;
}
static int config_parse_fstype(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
char **fstype = ASSERT_PTR(data);
assert(rvalue);
if (!filename_is_valid(rvalue))
return log_syntax(unit, LOG_ERR, filename, line, 0,
"File system type is not valid, refusing: %s", rvalue);
return free_and_strdup_warn(fstype, rvalue);
}
static int config_parse_copy_files(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
_cleanup_free_ char *source = NULL, *buffer = NULL, *resolved_source = NULL, *resolved_target = NULL;
const char *p = rvalue, *target;
Partition *partition = ASSERT_PTR(data);
int r;
assert(rvalue);
r = extract_first_word(&p, &source, ":", EXTRACT_CUNESCAPE|EXTRACT_DONT_COALESCE_SEPARATORS);
if (r < 0)
return log_syntax(unit, LOG_ERR, filename, line, r, "Failed to extract source path: %s", rvalue);
if (r == 0) {
log_syntax(unit, LOG_WARNING, filename, line, 0, "No argument specified: %s", rvalue);
return 0;
}
r = extract_first_word(&p, &buffer, ":", EXTRACT_CUNESCAPE|EXTRACT_DONT_COALESCE_SEPARATORS);
if (r < 0)
return log_syntax(unit, LOG_ERR, filename, line, r, "Failed to extract target path: %s", rvalue);
if (r == 0)
target = source; /* No target, then it's the same as the source */
else
target = buffer;
if (!isempty(p))
return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL), "Too many arguments: %s", rvalue);
r = specifier_printf(source, PATH_MAX-1, system_and_tmp_specifier_table, arg_root, NULL, &resolved_source);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to expand specifiers in CopyFiles= source, ignoring: %s", rvalue);
return 0;
}
r = path_simplify_and_warn(resolved_source, PATH_CHECK_ABSOLUTE, unit, filename, line, lvalue);
if (r < 0)
return 0;
r = specifier_printf(target, PATH_MAX-1, system_and_tmp_specifier_table, arg_root, NULL, &resolved_target);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to expand specifiers in CopyFiles= target, ignoring: %s", resolved_target);
return 0;
}
r = path_simplify_and_warn(resolved_target, PATH_CHECK_ABSOLUTE, unit, filename, line, lvalue);
if (r < 0)
return 0;
r = strv_consume_pair(&partition->copy_files, TAKE_PTR(resolved_source), TAKE_PTR(resolved_target));
if (r < 0)
return log_oom();
return 0;
}
static int config_parse_copy_blocks(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
_cleanup_free_ char *d = NULL;
Partition *partition = ASSERT_PTR(data);
int r;
assert(rvalue);
if (isempty(rvalue)) {
partition->copy_blocks_path = mfree(partition->copy_blocks_path);
partition->copy_blocks_auto = false;
return 0;
}
if (streq(rvalue, "auto")) {
partition->copy_blocks_path = mfree(partition->copy_blocks_path);
partition->copy_blocks_auto = true;
partition->copy_blocks_root = arg_root;
return 0;
}
r = specifier_printf(rvalue, PATH_MAX-1, system_and_tmp_specifier_table, arg_root, NULL, &d);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to expand specifiers in CopyBlocks= source path, ignoring: %s", rvalue);
return 0;
}
r = path_simplify_and_warn(d, PATH_CHECK_ABSOLUTE, unit, filename, line, lvalue);
if (r < 0)
return 0;
free_and_replace(partition->copy_blocks_path, d);
partition->copy_blocks_auto = false;
partition->copy_blocks_root = arg_root;
return 0;
}
static int config_parse_make_dirs(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Partition *partition = ASSERT_PTR(data);
const char *p = ASSERT_PTR(rvalue);
int r;
for (;;) {
_cleanup_free_ char *word = NULL, *d = NULL;
r = extract_first_word(&p, &word, NULL, EXTRACT_UNQUOTE);
if (r == -ENOMEM)
return log_oom();
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r, "Invalid syntax, ignoring: %s", rvalue);
return 0;
}
if (r == 0)
return 0;
r = specifier_printf(word, PATH_MAX-1, system_and_tmp_specifier_table, arg_root, NULL, &d);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to expand specifiers in MakeDirectories= parameter, ignoring: %s", word);
continue;
}
r = path_simplify_and_warn(d, PATH_CHECK_ABSOLUTE, unit, filename, line, lvalue);
if (r < 0)
continue;
r = strv_consume(&partition->make_directories, TAKE_PTR(d));
if (r < 0)
return log_oom();
}
}
static DEFINE_CONFIG_PARSE_ENUM_WITH_DEFAULT(config_parse_encrypt, encrypt_mode, EncryptMode, ENCRYPT_OFF, "Invalid encryption mode");
static int config_parse_gpt_flags(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
uint64_t *gpt_flags = ASSERT_PTR(data);
int r;
assert(rvalue);
r = safe_atou64(rvalue, gpt_flags);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse Flags= value, ignoring: %s", rvalue);
return 0;
}
return 0;
}
static int config_parse_uuid(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Partition *partition = ASSERT_PTR(data);
int r;
if (isempty(rvalue)) {
partition->new_uuid = SD_ID128_NULL;
partition->new_uuid_is_set = false;
return 0;
}
if (streq(rvalue, "null")) {
partition->new_uuid = SD_ID128_NULL;
partition->new_uuid_is_set = true;
return 0;
}
r = sd_id128_from_string(rvalue, &partition->new_uuid);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse 128bit ID/UUID, ignoring: %s", rvalue);
return 0;
}
partition->new_uuid_is_set = true;
return 0;
}
static DEFINE_CONFIG_PARSE_ENUM_WITH_DEFAULT(config_parse_verity, verity_mode, VerityMode, VERITY_OFF, "Invalid verity mode");
static DEFINE_CONFIG_PARSE_ENUM_WITH_DEFAULT(config_parse_minimize, minimize_mode, MinimizeMode, MINIMIZE_OFF, "Invalid minimize mode");
static int partition_read_definition(Partition *p, const char *path, const char *const *conf_file_dirs) {
ConfigTableItem table[] = {
{ "Partition", "Type", config_parse_type, 0, &p->type },
{ "Partition", "Label", config_parse_label, 0, &p->new_label },
{ "Partition", "UUID", config_parse_uuid, 0, p },
{ "Partition", "Priority", config_parse_int32, 0, &p->priority },
{ "Partition", "Weight", config_parse_weight, 0, &p->weight },
{ "Partition", "PaddingWeight", config_parse_weight, 0, &p->padding_weight },
{ "Partition", "SizeMinBytes", config_parse_size4096, 1, &p->size_min },
{ "Partition", "SizeMaxBytes", config_parse_size4096, -1, &p->size_max },
{ "Partition", "PaddingMinBytes", config_parse_size4096, 1, &p->padding_min },
{ "Partition", "PaddingMaxBytes", config_parse_size4096, -1, &p->padding_max },
{ "Partition", "FactoryReset", config_parse_bool, 0, &p->factory_reset },
{ "Partition", "CopyBlocks", config_parse_copy_blocks, 0, p },
{ "Partition", "Format", config_parse_fstype, 0, &p->format },
{ "Partition", "CopyFiles", config_parse_copy_files, 0, p },
{ "Partition", "MakeDirectories", config_parse_make_dirs, 0, p },
{ "Partition", "Encrypt", config_parse_encrypt, 0, &p->encrypt },
{ "Partition", "Verity", config_parse_verity, 0, &p->verity },
{ "Partition", "VerityMatchKey", config_parse_string, 0, &p->verity_match_key },
{ "Partition", "Flags", config_parse_gpt_flags, 0, &p->gpt_flags },
{ "Partition", "ReadOnly", config_parse_tristate, 0, &p->read_only },
{ "Partition", "NoAuto", config_parse_tristate, 0, &p->no_auto },
{ "Partition", "GrowFileSystem", config_parse_tristate, 0, &p->growfs },
{ "Partition", "SplitName", config_parse_string, 0, &p->split_name_format },
{ "Partition", "Minimize", config_parse_minimize, 0, &p->minimize },
{}
};
int r;
_cleanup_free_ char *filename = NULL;
const char* dropin_dirname;
r = path_extract_filename(path, &filename);
if (r < 0)
return log_error_errno(r, "Failed to extract filename from path '%s': %m", path);
dropin_dirname = strjoina(filename, ".d");
r = config_parse_many(
STRV_MAKE_CONST(path),
conf_file_dirs,
dropin_dirname,
"Partition\0",
config_item_table_lookup, table,
CONFIG_PARSE_WARN,
p,
NULL,
&p->drop_in_files);
if (r < 0)
return r;
if (partition_exclude(p))
return 0;
if (p->size_min != UINT64_MAX && p->size_max != UINT64_MAX && p->size_min > p->size_max)
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"SizeMinBytes= larger than SizeMaxBytes=, refusing.");
if (p->padding_min != UINT64_MAX && p->padding_max != UINT64_MAX && p->padding_min > p->padding_max)
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"PaddingMinBytes= larger than PaddingMaxBytes=, refusing.");
if (sd_id128_is_null(p->type.uuid))
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"Type= not defined, refusing.");
if ((p->copy_blocks_path || p->copy_blocks_auto) &&
(p->format || !strv_isempty(p->copy_files) || !strv_isempty(p->make_directories)))
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"Format=/CopyFiles=/MakeDirectories= and CopyBlocks= cannot be combined, refusing.");
if ((!strv_isempty(p->copy_files) || !strv_isempty(p->make_directories)) && streq_ptr(p->format, "swap"))
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"Format=swap and CopyFiles= cannot be combined, refusing.");
if (!p->format && (!strv_isempty(p->copy_files) || !strv_isempty(p->make_directories) || (p->encrypt != ENCRYPT_OFF && !(p->copy_blocks_path || p->copy_blocks_auto)))) {
/* Pick "ext4" as file system if we are configured to copy files or encrypt the device */
p->format = strdup("ext4");
if (!p->format)
return log_oom();
}
if (p->minimize != MINIMIZE_OFF && !p->format)
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"Minimize= can only be enabled if Format= is set");
if (p->minimize == MINIMIZE_BEST && !fstype_is_ro(p->format))
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"Minimize=best can only be used with read-only filesystems");
if ((!strv_isempty(p->copy_files) || !strv_isempty(p->make_directories)) && !mkfs_supports_root_option(p->format) && geteuid() != 0)
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EPERM),
"Need to be root to populate %s filesystems with CopyFiles=/MakeDirectories=",
p->format);
if (p->format && fstype_is_ro(p->format) && strv_isempty(p->copy_files) && strv_isempty(p->make_directories))
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"Cannot format %s filesystem without source files, refusing", p->format);
if (p->verity != VERITY_OFF || p->encrypt != ENCRYPT_OFF) {
r = dlopen_cryptsetup();
if (r < 0)
return log_syntax(NULL, LOG_ERR, path, 1, r,
"libcryptsetup not found, Verity=/Encrypt= are not supported: %m");
}
if (p->verity != VERITY_OFF && !p->verity_match_key)
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"VerityMatchKey= must be set if Verity=%s", verity_mode_to_string(p->verity));
if (p->verity == VERITY_OFF && p->verity_match_key)
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"VerityMatchKey= can only be set if Verity= is not \"%s\"",
verity_mode_to_string(p->verity));
if (IN_SET(p->verity, VERITY_HASH, VERITY_SIG) &&
(p->copy_files || p->copy_blocks_path || p->copy_blocks_auto || p->format || p->make_directories))
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"CopyBlocks=/CopyFiles=/Format=/MakeDirectories= cannot be used with Verity=%s",
verity_mode_to_string(p->verity));
if (p->verity != VERITY_OFF && p->encrypt != ENCRYPT_OFF)
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"Encrypting verity hash/data partitions is not supported");
if (p->verity == VERITY_SIG && !arg_private_key)
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"Verity signature partition requested but no private key provided (--private-key=)");
if (p->verity == VERITY_SIG && !arg_certificate)
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"Verity signature partition requested but no PEM certificate provided (--certificate=)");
if (p->verity == VERITY_SIG && (p->size_min != UINT64_MAX || p->size_max != UINT64_MAX))
return log_syntax(NULL, LOG_ERR, path, 1, SYNTHETIC_ERRNO(EINVAL),
"SizeMinBytes=/SizeMaxBytes= cannot be used with Verity=%s",
verity_mode_to_string(p->verity));
/* Verity partitions are read only, let's imply the RO flag hence, unless explicitly configured otherwise. */
if (IN_SET(p->type.designator, PARTITION_ROOT_VERITY, PARTITION_USR_VERITY) && p->read_only < 0)
p->read_only = true;
/* Default to "growfs" on, unless read-only */
if (gpt_partition_type_knows_growfs(p->type) &&
p->read_only <= 0)
p->growfs = true;
if (!p->split_name_format) {
char *s = strdup("%t");
if (!s)
return log_oom();
p->split_name_format = s;
} else if (streq(p->split_name_format, "-"))
p->split_name_format = mfree(p->split_name_format);
return 1;
}
static int find_verity_sibling(Context *context, Partition *p, VerityMode mode, Partition **ret) {
Partition *s = NULL;
assert(p);
assert(p->verity != VERITY_OFF);
assert(p->verity_match_key);
assert(mode != VERITY_OFF);
assert(p->verity != mode);
assert(ret);
/* Try to find the matching sibling partition of the given type for a verity partition. For a data
* partition, this is the corresponding hash partition with the same verity name (and vice versa for
* the hash partition). */
LIST_FOREACH(partitions, q, context->partitions) {
if (p == q)
continue;
if (q->verity != mode)
continue;
assert(q->verity_match_key);
if (!streq(p->verity_match_key, q->verity_match_key))
continue;
if (s)
return -ENOTUNIQ;
s = q;
}
if (!s)
return -ENXIO;
*ret = s;
return 0;
}
static int context_read_definitions(
Context *context,
char **directories,
const char *root) {
_cleanup_strv_free_ char **files = NULL;
Partition *last = NULL;
int r;
const char *const *dirs;
assert(context);
dirs = (const char* const*) (directories ?: CONF_PATHS_STRV("repart.d"));
r = conf_files_list_strv(&files, ".conf", directories ? NULL : root, CONF_FILES_REGULAR|CONF_FILES_FILTER_MASKED, dirs);
if (r < 0)
return log_error_errno(r, "Failed to enumerate *.conf files: %m");
STRV_FOREACH(f, files) {
_cleanup_(partition_freep) Partition *p = NULL;
p = partition_new();
if (!p)
return log_oom();
p->definition_path = strdup(*f);
if (!p->definition_path)
return log_oom();
r = partition_read_definition(p, *f, dirs);
if (r < 0)
return r;
if (r == 0)
continue;
LIST_INSERT_AFTER(partitions, context->partitions, last, p);
last = TAKE_PTR(p);
context->n_partitions++;
}
/* Check that each configured verity hash/data partition has a matching verity data/hash partition. */
LIST_FOREACH(partitions, p, context->partitions) {
if (p->verity == VERITY_OFF)
continue;
for (VerityMode mode = VERITY_OFF + 1; mode < _VERITY_MODE_MAX; mode++) {
Partition *q = NULL;
if (p->verity == mode)
continue;
if (p->siblings[mode])
continue;
r = find_verity_sibling(context, p, mode, &q);
if (r == -ENXIO) {
if (mode != VERITY_SIG)
return log_syntax(NULL, LOG_ERR, p->definition_path, 1, SYNTHETIC_ERRNO(EINVAL),
"Missing verity %s partition for verity %s partition with VerityMatchKey=%s",
verity_mode_to_string(mode), verity_mode_to_string(p->verity), p->verity_match_key);
} else if (r == -ENOTUNIQ)
return log_syntax(NULL, LOG_ERR, p->definition_path, 1, SYNTHETIC_ERRNO(EINVAL),
"Multiple verity %s partitions found for verity %s partition with VerityMatchKey=%s",
verity_mode_to_string(mode), verity_mode_to_string(p->verity), p->verity_match_key);
else if (r < 0)
return log_syntax(NULL, LOG_ERR, p->definition_path, 1, r,
"Failed to find verity %s partition for verity %s partition with VerityMatchKey=%s",
verity_mode_to_string(mode), verity_mode_to_string(p->verity), p->verity_match_key);
if (q) {
if (q->priority != p->priority)
return log_syntax(NULL, LOG_ERR, p->definition_path, 1, SYNTHETIC_ERRNO(EINVAL),
"Priority mismatch (%i != %i) for verity sibling partitions with VerityMatchKey=%s",
p->priority, q->priority, p->verity_match_key);
p->siblings[mode] = q;
}
}
}
return 0;
}
static int determine_current_padding(
struct fdisk_context *c,
struct fdisk_table *t,
struct fdisk_partition *p,
uint64_t secsz,
uint64_t grainsz,
uint64_t *ret) {
size_t n_partitions;
uint64_t offset, next = UINT64_MAX;
assert(c);
assert(t);
assert(p);
if (!fdisk_partition_has_end(p))
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Partition has no end!");
offset = fdisk_partition_get_end(p);
assert(offset < UINT64_MAX / secsz);
offset *= secsz;
n_partitions = fdisk_table_get_nents(t);
for (size_t i = 0; i < n_partitions; i++) {
struct fdisk_partition *q;
uint64_t start;
q = fdisk_table_get_partition(t, i);
if (!q)
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to read partition metadata: %m");
if (fdisk_partition_is_used(q) <= 0)
continue;
if (!fdisk_partition_has_start(q))
continue;
start = fdisk_partition_get_start(q);
assert(start < UINT64_MAX / secsz);
start *= secsz;
if (start >= offset && (next == UINT64_MAX || next > start))
next = start;
}
if (next == UINT64_MAX) {
/* No later partition? In that case check the end of the usable area */
next = fdisk_get_last_lba(c);
assert(next < UINT64_MAX);
next++; /* The last LBA is one sector before the end */
assert(next < UINT64_MAX / secsz);
next *= secsz;
if (offset > next)
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Partition end beyond disk end.");
}
assert(next >= offset);
offset = round_up_size(offset, grainsz);
next = round_down_size(next, grainsz);
*ret = LESS_BY(next, offset); /* Saturated subtraction, rounding might have fucked things up */
return 0;
}
static int fdisk_ask_cb(struct fdisk_context *c, struct fdisk_ask *ask, void *data) {
_cleanup_free_ char *ids = NULL;
int r;
if (fdisk_ask_get_type(ask) != FDISK_ASKTYPE_STRING)
return -EINVAL;
ids = new(char, SD_ID128_UUID_STRING_MAX);
if (!ids)
return -ENOMEM;
r = fdisk_ask_string_set_result(ask, sd_id128_to_uuid_string(*(sd_id128_t*) data, ids));
if (r < 0)
return r;
TAKE_PTR(ids);
return 0;
}
static int fdisk_set_disklabel_id_by_uuid(struct fdisk_context *c, sd_id128_t id) {
int r;
r = fdisk_set_ask(c, fdisk_ask_cb, &id);
if (r < 0)
return r;
r = fdisk_set_disklabel_id(c);
if (r < 0)
return r;
return fdisk_set_ask(c, NULL, NULL);
}
static int derive_uuid(sd_id128_t base, const char *token, sd_id128_t *ret) {
union {
uint8_t md[SHA256_DIGEST_SIZE];
sd_id128_t id;
} result;
assert(token);
assert(ret);
/* Derive a new UUID from the specified UUID in a stable and reasonably safe way. Specifically, we
* calculate the HMAC-SHA256 of the specified token string, keyed by the supplied base (typically the
* machine ID). We use the machine ID as key (and not as cleartext!) of the HMAC operation since it's
* the machine ID we don't want to leak. */
hmac_sha256(base.bytes, sizeof(base.bytes), token, strlen(token), result.md);
/* Take the first half, mark it as v4 UUID */
assert_cc(sizeof(result.md) == sizeof(result.id) * 2);
*ret = id128_make_v4_uuid(result.id);
return 0;
}
static int context_load_partition_table(Context *context) {
_cleanup_(fdisk_unref_contextp) struct fdisk_context *c = NULL;
_cleanup_(fdisk_unref_tablep) struct fdisk_table *t = NULL;
uint64_t left_boundary = UINT64_MAX, first_lba, last_lba, nsectors;
_cleanup_free_ char *disk_uuid_string = NULL;
bool from_scratch = false;
sd_id128_t disk_uuid;
size_t n_partitions;
unsigned long secsz;
uint64_t grainsz;
int r;
assert(context);
assert(!context->fdisk_context);
assert(!context->free_areas);
assert(context->start == UINT64_MAX);
assert(context->end == UINT64_MAX);
assert(context->total == UINT64_MAX);
c = fdisk_new_context();
if (!c)
return log_oom();
if (arg_sector_size > 0)
r = fdisk_save_user_sector_size(c, /* phy= */ 0, arg_sector_size);
else {
uint32_t ssz;
if (context->backing_fd < 0) {
context->backing_fd = open(context->node, O_RDONLY|O_CLOEXEC);
if (context->backing_fd < 0)
return log_error_errno(errno, "Failed to open device '%s': %m", context->node);
}
/* Auto-detect sector size if not specified. */
r = probe_sector_size_prefer_ioctl(context->backing_fd, &ssz);
if (r < 0)
return log_error_errno(r, "Failed to probe sector size of '%s': %m", context->node);
r = fdisk_save_user_sector_size(c, /* phy= */ 0, ssz);
}
if (r < 0)
return log_error_errno(r, "Failed to set sector size: %m");
/* libfdisk doesn't have an API to operate on arbitrary fds, hence reopen the fd going via the
* /proc/self/fd/ magic path if we have an existing fd. Open the original file otherwise. */
r = fdisk_assign_device(
c,
context->backing_fd >= 0 ? FORMAT_PROC_FD_PATH(context->backing_fd) : context->node,
arg_dry_run);
if (r == -EINVAL && arg_size_auto) {
struct stat st;
/* libfdisk returns EINVAL if opening a file of size zero. Let's check for that, and accept
* it if automatic sizing is requested. */
if (context->backing_fd < 0)
r = stat(context->node, &st);
else
r = fstat(context->backing_fd, &st);
if (r < 0)
return log_error_errno(errno, "Failed to stat block device '%s': %m", context->node);
if (S_ISREG(st.st_mode) && st.st_size == 0) {
/* User the fallback values if we have no better idea */
context->sector_size = arg_sector_size ?: 512;
context->grain_size = 4096;
return /* from_scratch = */ true;
}
r = -EINVAL;
}
if (r < 0)
return log_error_errno(r, "Failed to open device '%s': %m", context->node);
if (context->backing_fd < 0) {
/* If we have no fd referencing the device yet, make a copy of the fd now, so that we have one */
context->backing_fd = fd_reopen(fdisk_get_devfd(c), O_RDONLY|O_CLOEXEC);
if (context->backing_fd < 0)
return log_error_errno(context->backing_fd, "Failed to duplicate fdisk fd: %m");
/* Tell udev not to interfere while we are processing the device */
if (flock(context->backing_fd, arg_dry_run ? LOCK_SH : LOCK_EX) < 0)
return log_error_errno(errno, "Failed to lock block device: %m");
}
/* The offsets/sizes libfdisk returns to us will be in multiple of the sector size of the
* device. This is typically 512, and sometimes 4096. Let's query libfdisk once for it, and then use
* it for all our needs. Note that the values we use ourselves always are in bytes though, thus mean
* the same thing universally. Also note that regardless what kind of sector size is in use we'll
* place partitions at multiples of 4K. */
secsz = fdisk_get_sector_size(c);
/* Insist on a power of two, and that it's a multiple of 512, i.e. the traditional sector size. */
if (secsz < 512 || !ISPOWEROF2(secsz))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Sector size %lu is not a power of two larger than 512? Refusing.", secsz);
/* Use at least 4K, and ensure it's a multiple of the sector size, regardless if that is smaller or
* larger */
grainsz = secsz < 4096 ? 4096 : secsz;
log_debug("Sector size of device is %lu bytes. Using grain size of %" PRIu64 ".", secsz, grainsz);
switch (arg_empty) {
case EMPTY_REFUSE:
/* Refuse empty disks, insist on an existing GPT partition table */
if (!fdisk_is_labeltype(c, FDISK_DISKLABEL_GPT))
return log_notice_errno(SYNTHETIC_ERRNO(EHWPOISON), "Disk %s has no GPT disk label, not repartitioning.", context->node);
break;
case EMPTY_REQUIRE:
/* Require an empty disk, refuse any existing partition table */
r = fdisk_has_label(c);
if (r < 0)
return log_error_errno(r, "Failed to determine whether disk %s has a disk label: %m", context->node);
if (r > 0)
return log_notice_errno(SYNTHETIC_ERRNO(EHWPOISON), "Disk %s already has a disk label, refusing.", context->node);
from_scratch = true;
break;
case EMPTY_ALLOW:
/* Allow both an empty disk and an existing partition table, but only GPT */
r = fdisk_has_label(c);
if (r < 0)
return log_error_errno(r, "Failed to determine whether disk %s has a disk label: %m", context->node);
if (r > 0) {
if (!fdisk_is_labeltype(c, FDISK_DISKLABEL_GPT))
return log_notice_errno(SYNTHETIC_ERRNO(EHWPOISON), "Disk %s has non-GPT disk label, not repartitioning.", context->node);
} else
from_scratch = true;
break;
case EMPTY_FORCE:
case EMPTY_CREATE:
/* Always reinitiaize the disk, don't consider what there was on the disk before */
from_scratch = true;
break;
}
if (from_scratch) {
r = fdisk_create_disklabel(c, "gpt");
if (r < 0)
return log_error_errno(r, "Failed to create GPT disk label: %m");
r = derive_uuid(context->seed, "disk-uuid", &disk_uuid);
if (r < 0)
return log_error_errno(r, "Failed to acquire disk GPT uuid: %m");
r = fdisk_set_disklabel_id_by_uuid(c, disk_uuid);
if (r < 0)
return log_error_errno(r, "Failed to set GPT disk label: %m");
goto add_initial_free_area;
}
r = fdisk_get_disklabel_id(c, &disk_uuid_string);
if (r < 0)
return log_error_errno(r, "Failed to get current GPT disk label UUID: %m");
r = sd_id128_from_string(disk_uuid_string, &disk_uuid);
if (r < 0)
return log_error_errno(r, "Failed to parse current GPT disk label UUID: %m");
if (sd_id128_is_null(disk_uuid)) {
r = derive_uuid(context->seed, "disk-uuid", &disk_uuid);
if (r < 0)
return log_error_errno(r, "Failed to acquire disk GPT uuid: %m");
r = fdisk_set_disklabel_id(c);
if (r < 0)
return log_error_errno(r, "Failed to set GPT disk label: %m");
}
r = fdisk_get_partitions(c, &t);
if (r < 0)
return log_error_errno(r, "Failed to acquire partition table: %m");
n_partitions = fdisk_table_get_nents(t);
for (size_t i = 0; i < n_partitions; i++) {
_cleanup_free_ char *label_copy = NULL;
Partition *last = NULL;
struct fdisk_partition *p;
const char *label;
uint64_t sz, start;
bool found = false;
sd_id128_t ptid, id;
size_t partno;
p = fdisk_table_get_partition(t, i);
if (!p)
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to read partition metadata: %m");
if (fdisk_partition_is_used(p) <= 0)
continue;
if (fdisk_partition_has_start(p) <= 0 ||
fdisk_partition_has_size(p) <= 0 ||
fdisk_partition_has_partno(p) <= 0)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Found a partition without a position, size or number.");
r = fdisk_partition_get_type_as_id128(p, &ptid);
if (r < 0)
return log_error_errno(r, "Failed to query partition type UUID: %m");
r = fdisk_partition_get_uuid_as_id128(p, &id);
if (r < 0)
return log_error_errno(r, "Failed to query partition UUID: %m");
label = fdisk_partition_get_name(p);
if (!isempty(label)) {
label_copy = strdup(label);
if (!label_copy)
return log_oom();
}
sz = fdisk_partition_get_size(p);
assert(sz <= UINT64_MAX/secsz);
sz *= secsz;
start = fdisk_partition_get_start(p);
assert(start <= UINT64_MAX/secsz);
start *= secsz;
partno = fdisk_partition_get_partno(p);
if (left_boundary == UINT64_MAX || left_boundary > start)
left_boundary = start;
/* Assign this existing partition to the first partition of the right type that doesn't have
* an existing one assigned yet. */
LIST_FOREACH(partitions, pp, context->partitions) {
last = pp;
if (!sd_id128_equal(pp->type.uuid, ptid))
continue;
if (!pp->current_partition) {
pp->current_uuid = id;
pp->current_size = sz;
pp->offset = start;
pp->partno = partno;
pp->current_label = TAKE_PTR(label_copy);
pp->current_partition = p;
fdisk_ref_partition(p);
r = determine_current_padding(c, t, p, secsz, grainsz, &pp->current_padding);
if (r < 0)
return r;
if (pp->current_padding > 0) {
r = context_add_free_area(context, pp->current_padding, pp);
if (r < 0)
return r;
}
found = true;
break;
}
}
/* If we have no matching definition, create a new one. */
if (!found) {
_cleanup_(partition_freep) Partition *np = NULL;
np = partition_new();
if (!np)
return log_oom();
np->current_uuid = id;
np->type = gpt_partition_type_from_uuid(ptid);
np->current_size = sz;
np->offset = start;
np->partno = partno;
np->current_label = TAKE_PTR(label_copy);
np->current_partition = p;
fdisk_ref_partition(p);
r = determine_current_padding(c, t, p, secsz, grainsz, &np->current_padding);
if (r < 0)
return r;
if (np->current_padding > 0) {
r = context_add_free_area(context, np->current_padding, np);
if (r < 0)
return r;
}
LIST_INSERT_AFTER(partitions, context->partitions, last, TAKE_PTR(np));
context->n_partitions++;
}
}
add_initial_free_area:
nsectors = fdisk_get_nsectors(c);
assert(nsectors <= UINT64_MAX/secsz);
nsectors *= secsz;
first_lba = fdisk_get_first_lba(c);
assert(first_lba <= UINT64_MAX/secsz);
first_lba *= secsz;
last_lba = fdisk_get_last_lba(c);
assert(last_lba < UINT64_MAX);
last_lba++;
assert(last_lba <= UINT64_MAX/secsz);
last_lba *= secsz;
assert(last_lba >= first_lba);
if (left_boundary == UINT64_MAX) {
/* No partitions at all? Then the whole disk is up for grabs. */
first_lba = round_up_size(first_lba, grainsz);
last_lba = round_down_size(last_lba, grainsz);
if (last_lba > first_lba) {
r = context_add_free_area(context, last_lba - first_lba, NULL);
if (r < 0)
return r;
}
} else {
/* Add space left of first partition */
assert(left_boundary >= first_lba);
first_lba = round_up_size(first_lba, grainsz);
left_boundary = round_down_size(left_boundary, grainsz);
last_lba = round_down_size(last_lba, grainsz);
if (left_boundary > first_lba) {
r = context_add_free_area(context, left_boundary - first_lba, NULL);
if (r < 0)
return r;
}
}
context->start = first_lba;
context->end = last_lba;
context->total = nsectors;
context->sector_size = secsz;
context->grain_size = grainsz;
context->fdisk_context = TAKE_PTR(c);
return from_scratch;
}
static void context_unload_partition_table(Context *context) {
assert(context);
LIST_FOREACH(partitions, p, context->partitions) {
/* Entirely remove partitions that have no configuration */
if (PARTITION_IS_FOREIGN(p)) {
partition_unlink_and_free(context, p);
continue;
}
/* Otherwise drop all data we read off the block device and everything we might have
* calculated based on it */
p->dropped = false;
p->current_size = UINT64_MAX;
p->new_size = UINT64_MAX;
p->current_padding = UINT64_MAX;
p->new_padding = UINT64_MAX;
p->partno = UINT64_MAX;
p->offset = UINT64_MAX;
if (p->current_partition) {
fdisk_unref_partition(p->current_partition);
p->current_partition = NULL;
}
if (p->new_partition) {
fdisk_unref_partition(p->new_partition);
p->new_partition = NULL;
}
p->padding_area = NULL;
p->allocated_to_area = NULL;
p->current_uuid = SD_ID128_NULL;
p->current_label = mfree(p->current_label);
}
context->start = UINT64_MAX;
context->end = UINT64_MAX;
context->total = UINT64_MAX;
if (context->fdisk_context) {
fdisk_unref_context(context->fdisk_context);
context->fdisk_context = NULL;
}
context_free_free_areas(context);
}
static int format_size_change(uint64_t from, uint64_t to, char **ret) {
char *t;
if (from != UINT64_MAX) {
if (from == to || to == UINT64_MAX)
t = strdup(FORMAT_BYTES(from));
else
t = strjoin(FORMAT_BYTES(from), " ", special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), " ", FORMAT_BYTES(to));
} else if (to != UINT64_MAX)
t = strjoin(special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), " ", FORMAT_BYTES(to));
else {
*ret = NULL;
return 0;
}
if (!t)
return log_oom();
*ret = t;
return 1;
}
static const char *partition_label(const Partition *p) {
assert(p);
if (p->new_label)
return p->new_label;
if (p->current_label)
return p->current_label;
return gpt_partition_type_uuid_to_string(p->type.uuid);
}
static int context_dump_partitions(Context *context) {
_cleanup_(table_unrefp) Table *t = NULL;
uint64_t sum_padding = 0, sum_size = 0;
int r;
const size_t roothash_col = 13, dropin_files_col = 14, split_path_col = 15;
bool has_roothash = false, has_dropin_files = false, has_split_path = false;
if ((arg_json_format_flags & JSON_FORMAT_OFF) && context->n_partitions == 0) {
log_info("Empty partition table.");
return 0;
}
t = table_new("type",
"label",
"uuid",
"file",
"node",
"offset",
"old size",
"raw size",
"size",
"old padding",
"raw padding",
"padding",
"activity",
"roothash",
"drop-in files",
"split path");
if (!t)
return log_oom();
if (!DEBUG_LOGGING) {
if (arg_json_format_flags & JSON_FORMAT_OFF)
(void) table_set_display(t, (size_t) 0, (size_t) 1, (size_t) 2, (size_t) 3, (size_t) 4,
(size_t) 8, (size_t) 11, roothash_col, dropin_files_col,
split_path_col);
else
(void) table_set_display(t, (size_t) 0, (size_t) 1, (size_t) 2, (size_t) 3, (size_t) 4,
(size_t) 5, (size_t) 6, (size_t) 7, (size_t) 9, (size_t) 10,
(size_t) 12, roothash_col, dropin_files_col,
split_path_col);
}
(void) table_set_align_percent(t, table_get_cell(t, 0, 5), 100);
(void) table_set_align_percent(t, table_get_cell(t, 0, 6), 100);
(void) table_set_align_percent(t, table_get_cell(t, 0, 7), 100);
(void) table_set_align_percent(t, table_get_cell(t, 0, 8), 100);
(void) table_set_align_percent(t, table_get_cell(t, 0, 9), 100);
(void) table_set_align_percent(t, table_get_cell(t, 0, 10), 100);
(void) table_set_align_percent(t, table_get_cell(t, 0, 11), 100);
LIST_FOREACH(partitions, p, context->partitions) {
_cleanup_free_ char *size_change = NULL, *padding_change = NULL, *partname = NULL, *rh = NULL;
char uuid_buffer[SD_ID128_UUID_STRING_MAX];
const char *label, *activity = NULL;
if (p->dropped)
continue;
if (p->current_size == UINT64_MAX)
activity = "create";
else if (p->current_size != p->new_size)
activity = "resize";
label = partition_label(p);
partname = p->partno != UINT64_MAX ? fdisk_partname(context->node, p->partno+1) : NULL;
r = format_size_change(p->current_size, p->new_size, &size_change);
if (r < 0)
return r;
r = format_size_change(p->current_padding, p->new_padding, &padding_change);
if (r < 0)
return r;
if (p->new_size != UINT64_MAX)
sum_size += p->new_size;
if (p->new_padding != UINT64_MAX)
sum_padding += p->new_padding;
if (p->verity != VERITY_OFF) {
Partition *hp = p->verity == VERITY_HASH ? p : p->siblings[VERITY_HASH];
rh = hp->roothash ? hexmem(hp->roothash, hp->roothash_size) : strdup("TBD");
if (!rh)
return log_oom();
}
r = table_add_many(
t,
TABLE_STRING, gpt_partition_type_uuid_to_string_harder(p->type.uuid, uuid_buffer),
TABLE_STRING, empty_to_null(label) ?: "-", TABLE_SET_COLOR, empty_to_null(label) ? NULL : ansi_grey(),
TABLE_UUID, p->new_uuid_is_set ? p->new_uuid : p->current_uuid,
TABLE_PATH_BASENAME, p->definition_path, TABLE_SET_COLOR, p->definition_path ? NULL : ansi_grey(),
TABLE_STRING, partname ?: "-", TABLE_SET_COLOR, partname ? NULL : ansi_highlight(),
TABLE_UINT64, p->offset,
TABLE_UINT64, p->current_size == UINT64_MAX ? 0 : p->current_size,
TABLE_UINT64, p->new_size,
TABLE_STRING, size_change, TABLE_SET_COLOR, !p->partitions_next && sum_size > 0 ? ansi_underline() : NULL,
TABLE_UINT64, p->current_padding == UINT64_MAX ? 0 : p->current_padding,
TABLE_UINT64, p->new_padding,
TABLE_STRING, padding_change, TABLE_SET_COLOR, !p->partitions_next && sum_padding > 0 ? ansi_underline() : NULL,
TABLE_STRING, activity ?: "unchanged",
TABLE_STRING, rh,
TABLE_STRV, p->drop_in_files,
TABLE_STRING, empty_to_null(p->split_path) ?: "-");
if (r < 0)
return table_log_add_error(r);
has_roothash = has_roothash || !isempty(rh);
has_dropin_files = has_dropin_files || !strv_isempty(p->drop_in_files);
has_split_path = has_split_path || !isempty(p->split_path);
}
if ((arg_json_format_flags & JSON_FORMAT_OFF) && (sum_padding > 0 || sum_size > 0)) {
const char *a, *b;
a = strjoina(special_glyph(SPECIAL_GLYPH_SIGMA), " = ", FORMAT_BYTES(sum_size));
b = strjoina(special_glyph(SPECIAL_GLYPH_SIGMA), " = ", FORMAT_BYTES(sum_padding));
r = table_add_many(
t,
TABLE_EMPTY,
TABLE_EMPTY,
TABLE_EMPTY,
TABLE_EMPTY,
TABLE_EMPTY,
TABLE_EMPTY,
TABLE_EMPTY,
TABLE_EMPTY,
TABLE_STRING, a,
TABLE_EMPTY,
TABLE_EMPTY,
TABLE_STRING, b,
TABLE_EMPTY,
TABLE_EMPTY,
TABLE_EMPTY,
TABLE_EMPTY);
if (r < 0)
return table_log_add_error(r);
}
if (!has_roothash) {
r = table_hide_column_from_display(t, roothash_col);
if (r < 0)
return log_error_errno(r, "Failed to set columns to display: %m");
}
if (!has_dropin_files) {
r = table_hide_column_from_display(t, dropin_files_col);
if (r < 0)
return log_error_errno(r, "Failed to set columns to display: %m");
}
if (!has_split_path) {
r = table_hide_column_from_display(t, split_path_col);
if (r < 0)
return log_error_errno(r, "Failed to set columns to display: %m");
}
return table_print_with_pager(t, arg_json_format_flags, arg_pager_flags, arg_legend);
}
static void context_bar_char_process_partition(
Context *context,
Partition *bar[],
size_t n,
Partition *p,
size_t *ret_start) {
uint64_t from, to, total;
size_t x, y;
assert(context);
assert(bar);
assert(n > 0);
assert(p);
if (p->dropped)
return;
assert(p->offset != UINT64_MAX);
assert(p->new_size != UINT64_MAX);
from = p->offset;
to = from + p->new_size;
assert(context->total > 0);
total = context->total;
assert(from <= total);
x = from * n / total;
assert(to <= total);
y = to * n / total;
assert(x <= y);
assert(y <= n);
for (size_t i = x; i < y; i++)
bar[i] = p;
*ret_start = x;
}
static int partition_hint(const Partition *p, const char *node, char **ret) {
_cleanup_free_ char *buf = NULL;
const char *label;
sd_id128_t id;
/* Tries really hard to find a suitable description for this partition */
if (p->definition_path)
return path_extract_filename(p->definition_path, ret);
label = partition_label(p);
if (!isempty(label)) {
buf = strdup(label);
goto done;
}
if (p->partno != UINT64_MAX) {
buf = fdisk_partname(node, p->partno+1);
goto done;
}
if (p->new_uuid_is_set)
id = p->new_uuid;
else if (!sd_id128_is_null(p->current_uuid))
id = p->current_uuid;
else
id = p->type.uuid;
buf = strdup(SD_ID128_TO_UUID_STRING(id));
done:
if (!buf)
return -ENOMEM;
*ret = TAKE_PTR(buf);
return 0;
}
static int context_dump_partition_bar(Context *context) {
_cleanup_free_ Partition **bar = NULL;
_cleanup_free_ size_t *start_array = NULL;
Partition *last = NULL;
bool z = false;
size_t c, j = 0;
assert_se((c = columns()) >= 2);
c -= 2; /* We do not use the leftmost and rightmost character cell */
bar = new0(Partition*, c);
if (!bar)
return log_oom();
start_array = new(size_t, context->n_partitions);
if (!start_array)
return log_oom();
LIST_FOREACH(partitions, p, context->partitions)
context_bar_char_process_partition(context, bar, c, p, start_array + j++);
putc(' ', stdout);
for (size_t i = 0; i < c; i++) {
if (bar[i]) {
if (last != bar[i])
z = !z;
fputs(z ? ansi_green() : ansi_yellow(), stdout);
fputs(special_glyph(SPECIAL_GLYPH_DARK_SHADE), stdout);
} else {
fputs(ansi_normal(), stdout);
fputs(special_glyph(SPECIAL_GLYPH_LIGHT_SHADE), stdout);
}
last = bar[i];
}
fputs(ansi_normal(), stdout);
putc('\n', stdout);
for (size_t i = 0; i < context->n_partitions; i++) {
_cleanup_free_ char **line = NULL;
line = new0(char*, c);
if (!line)
return log_oom();
j = 0;
LIST_FOREACH(partitions, p, context->partitions) {
_cleanup_free_ char *d = NULL;
j++;
if (i < context->n_partitions - j) {
if (line[start_array[j-1]]) {
const char *e;
/* Upgrade final corner to the right with a branch to the right */
e = startswith(line[start_array[j-1]], special_glyph(SPECIAL_GLYPH_TREE_RIGHT));
if (e) {
d = strjoin(special_glyph(SPECIAL_GLYPH_TREE_BRANCH), e);
if (!d)
return log_oom();
}
}
if (!d) {
d = strdup(special_glyph(SPECIAL_GLYPH_TREE_VERTICAL));
if (!d)
return log_oom();
}
} else if (i == context->n_partitions - j) {
_cleanup_free_ char *hint = NULL;
(void) partition_hint(p, context->node, &hint);
if (streq_ptr(line[start_array[j-1]], special_glyph(SPECIAL_GLYPH_TREE_VERTICAL)))
d = strjoin(special_glyph(SPECIAL_GLYPH_TREE_BRANCH), " ", strna(hint));
else
d = strjoin(special_glyph(SPECIAL_GLYPH_TREE_RIGHT), " ", strna(hint));
if (!d)
return log_oom();
}
if (d)
free_and_replace(line[start_array[j-1]], d);
}
putc(' ', stdout);
j = 0;
while (j < c) {
if (line[j]) {
fputs(line[j], stdout);
j += utf8_console_width(line[j]);
} else {
putc(' ', stdout);
j++;
}
}
putc('\n', stdout);
for (j = 0; j < c; j++)
free(line[j]);
}
return 0;
}
static bool context_has_roothash(Context *context) {
LIST_FOREACH(partitions, p, context->partitions)
if (p->roothash)
return true;
return false;
}
static int context_dump(Context *context, bool late) {
int r;
assert(context);
if (arg_pretty == 0 && FLAGS_SET(arg_json_format_flags, JSON_FORMAT_OFF))
return 0;
/* If we're outputting JSON, only dump after doing all operations so we can include the roothashes
* in the output. */
if (!late && !FLAGS_SET(arg_json_format_flags, JSON_FORMAT_OFF))
return 0;
/* If we're not outputting JSON, only dump again after doing all operations if there are any
* roothashes that we need to communicate to the user. */
if (late && FLAGS_SET(arg_json_format_flags, JSON_FORMAT_OFF) && !context_has_roothash(context))
return 0;
r = context_dump_partitions(context);
if (r < 0)
return r;
/* Make sure we only write the partition bar once, even if we're writing the partition table twice to
* communicate roothashes. */
if (FLAGS_SET(arg_json_format_flags, JSON_FORMAT_OFF) && !late) {
putc('\n', stdout);
r = context_dump_partition_bar(context);
if (r < 0)
return r;
putc('\n', stdout);
}
fflush(stdout);
return 0;
}
static bool context_changed(const Context *context) {
assert(context);
LIST_FOREACH(partitions, p, context->partitions) {
if (p->dropped)
continue;
if (p->allocated_to_area)
return true;
if (p->new_size != p->current_size)
return true;
}
return false;
}
static int context_wipe_range(Context *context, uint64_t offset, uint64_t size) {
_cleanup_(blkid_free_probep) blkid_probe probe = NULL;
int r;
assert(context);
assert(offset != UINT64_MAX);
assert(size != UINT64_MAX);
probe = blkid_new_probe();
if (!probe)
return log_oom();
errno = 0;
r = blkid_probe_set_device(probe, fdisk_get_devfd(context->fdisk_context), offset, size);
if (r < 0)
return log_error_errno(errno ?: SYNTHETIC_ERRNO(EIO), "Failed to allocate device probe for wiping.");
errno = 0;
if (blkid_probe_enable_superblocks(probe, true) < 0 ||
blkid_probe_set_superblocks_flags(probe, BLKID_SUBLKS_MAGIC|BLKID_SUBLKS_BADCSUM) < 0 ||
blkid_probe_enable_partitions(probe, true) < 0 ||
blkid_probe_set_partitions_flags(probe, BLKID_PARTS_MAGIC) < 0)
return log_error_errno(errno ?: SYNTHETIC_ERRNO(EIO), "Failed to enable superblock and partition probing.");
for (;;) {
errno = 0;
r = blkid_do_probe(probe);
if (r < 0)
return log_error_errno(errno ?: SYNTHETIC_ERRNO(EIO), "Failed to probe for file systems.");
if (r > 0)
break;
errno = 0;
if (blkid_do_wipe(probe, false) < 0)
return log_error_errno(errno ?: SYNTHETIC_ERRNO(EIO), "Failed to wipe file system signature.");
}
return 0;
}
static int context_wipe_partition(Context *context, Partition *p) {
int r;
assert(context);
assert(p);
assert(!PARTITION_EXISTS(p)); /* Safety check: never wipe existing partitions */
assert(p->offset != UINT64_MAX);
assert(p->new_size != UINT64_MAX);
r = context_wipe_range(context, p->offset, p->new_size);
if (r < 0)
return r;
log_info("Successfully wiped file system signatures from future partition %" PRIu64 ".", p->partno);
return 0;
}
static int context_discard_range(
Context *context,
uint64_t offset,
uint64_t size) {
struct stat st;
int fd;
assert(context);
assert(offset != UINT64_MAX);
assert(size != UINT64_MAX);
if (size <= 0)
return 0;
assert_se((fd = fdisk_get_devfd(context->fdisk_context)) >= 0);
if (fstat(fd, &st) < 0)
return -errno;
if (S_ISREG(st.st_mode)) {
if (fallocate(fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE, offset, size) < 0) {
if (ERRNO_IS_NOT_SUPPORTED(errno))
return -EOPNOTSUPP;
return -errno;
}
return 1;
}
if (S_ISBLK(st.st_mode)) {
uint64_t range[2], end;
range[0] = round_up_size(offset, context->sector_size);
if (offset > UINT64_MAX - size)
return -ERANGE;
end = offset + size;
if (end <= range[0])
return 0;
range[1] = round_down_size(end - range[0], context->sector_size);
if (range[1] <= 0)
return 0;
if (ioctl(fd, BLKDISCARD, range) < 0) {
if (ERRNO_IS_NOT_SUPPORTED(errno))
return -EOPNOTSUPP;
return -errno;
}
return 1;
}
return -EOPNOTSUPP;
}
static int context_discard_partition(Context *context, Partition *p) {
int r;
assert(context);
assert(p);
assert(p->offset != UINT64_MAX);
assert(p->new_size != UINT64_MAX);
assert(!PARTITION_EXISTS(p)); /* Safety check: never discard existing partitions */
if (!arg_discard)
return 0;
r = context_discard_range(context, p->offset, p->new_size);
if (r == -EOPNOTSUPP) {
log_info("Storage does not support discard, not discarding data in future partition %" PRIu64 ".", p->partno);
return 0;
}
if (r == -EBUSY) {
/* Let's handle this gracefully: https://bugzilla.kernel.org/show_bug.cgi?id=211167 */
log_info("Block device is busy, not discarding partition %" PRIu64 " because it probably is mounted.", p->partno);
return 0;
}
if (r == 0) {
log_info("Partition %" PRIu64 " too short for discard, skipping.", p->partno);
return 0;
}
if (r < 0)
return log_error_errno(r, "Failed to discard data for future partition %" PRIu64 ".", p->partno);
log_info("Successfully discarded data from future partition %" PRIu64 ".", p->partno);
return 1;
}
static int context_discard_gap_after(Context *context, Partition *p) {
uint64_t gap, next = UINT64_MAX;
int r;
assert(context);
assert(!p || (p->offset != UINT64_MAX && p->new_size != UINT64_MAX));
if (!arg_discard)
return 0;
if (p)
gap = p->offset + p->new_size;
else
gap = context->start;
LIST_FOREACH(partitions, q, context->partitions) {
if (q->dropped)
continue;
assert(q->offset != UINT64_MAX);
assert(q->new_size != UINT64_MAX);
if (q->offset < gap)
continue;
if (next == UINT64_MAX || q->offset < next)
next = q->offset;
}
if (next == UINT64_MAX) {
next = context->end;
if (gap > next)
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Partition end beyond disk end.");
}
assert(next >= gap);
r = context_discard_range(context, gap, next - gap);
if (r == -EOPNOTSUPP) {
if (p)
log_info("Storage does not support discard, not discarding gap after partition %" PRIu64 ".", p->partno);
else
log_info("Storage does not support discard, not discarding gap at beginning of disk.");
return 0;
}
if (r == 0) /* Too short */
return 0;
if (r < 0) {
if (p)
return log_error_errno(r, "Failed to discard gap after partition %" PRIu64 ".", p->partno);
else
return log_error_errno(r, "Failed to discard gap at beginning of disk.");
}
if (p)
log_info("Successfully discarded gap after partition %" PRIu64 ".", p->partno);
else
log_info("Successfully discarded gap at beginning of disk.");
return 0;
}
static int context_wipe_and_discard(Context *context) {
int r;
assert(context);
/* Wipe and discard the contents of all partitions we are about to create. We skip the discarding if
* we were supposed to start from scratch anyway, as in that case we just discard the whole block
* device in one go early on. */
LIST_FOREACH(partitions, p, context->partitions) {
if (!p->allocated_to_area)
continue;
if (partition_defer(p))
continue;
r = context_wipe_partition(context, p);
if (r < 0)
return r;
if (!context->from_scratch) {
r = context_discard_partition(context, p);
if (r < 0)
return r;
r = context_discard_gap_after(context, p);
if (r < 0)
return r;
}
}
if (!context->from_scratch) {
r = context_discard_gap_after(context, NULL);
if (r < 0)
return r;
}
return 0;
}
typedef struct {
LoopDevice *loop;
int fd;
char *path;
int whole_fd;
} PartitionTarget;
static int partition_target_fd(PartitionTarget *t) {
assert(t);
assert(t->loop || t->fd >= 0 || t->whole_fd >= 0);
return t->loop ? t->loop->fd : t->fd >= 0 ? t->fd : t->whole_fd;
}
static const char* partition_target_path(PartitionTarget *t) {
assert(t);
assert(t->loop || t->path);
return t->loop ? t->loop->node : t->path;
}
static PartitionTarget *partition_target_free(PartitionTarget *t) {
if (!t)
return NULL;
loop_device_unref(t->loop);
safe_close(t->fd);
unlink_and_free(t->path);
return mfree(t);
}
DEFINE_TRIVIAL_CLEANUP_FUNC(PartitionTarget*, partition_target_free);
static int prepare_temporary_file(PartitionTarget *t, uint64_t size) {
_cleanup_(unlink_and_freep) char *temp = NULL;
_cleanup_close_ int fd = -EBADF;
const char *vt;
int r;
assert(t);
r = var_tmp_dir(&vt);
if (r < 0)
return log_error_errno(r, "Could not determine temporary directory: %m");
temp = path_join(vt, "repart-XXXXXX");
if (!temp)
return log_oom();
fd = mkostemp_safe(temp);
if (fd < 0)
return log_error_errno(fd, "Failed to create temporary file: %m");
if (ftruncate(fd, size) < 0)
return log_error_errno(errno, "Failed to truncate temporary file to %s: %m",
FORMAT_BYTES(size));
t->fd = TAKE_FD(fd);
t->path = TAKE_PTR(temp);
return 0;
}
static int partition_target_prepare(
Context *context,
Partition *p,
uint64_t size,
bool need_path,
PartitionTarget **ret) {
_cleanup_(partition_target_freep) PartitionTarget *t = NULL;
_cleanup_(loop_device_unrefp) LoopDevice *d = NULL;
int whole_fd, r;
assert(context);
assert(p);
assert(ret);
assert_se((whole_fd = fdisk_get_devfd(context->fdisk_context)) >= 0);
t = new(PartitionTarget, 1);
if (!t)
return log_oom();
*t = (PartitionTarget) {
.fd = -EBADF,
.whole_fd = -EBADF,
};
if (!need_path) {
if (lseek(whole_fd, p->offset, SEEK_SET) == (off_t) -1)
return log_error_errno(errno, "Failed to seek to partition offset: %m");
t->whole_fd = whole_fd;
*ret = TAKE_PTR(t);
return 0;
}
/* Loopback block devices are not only useful to turn regular files into block devices, but
* also to cut out sections of block devices into new block devices. */
r = loop_device_make(whole_fd, O_RDWR, p->offset, size, 0, 0, LOCK_EX, &d);
if (r < 0 && r != -ENOENT && !ERRNO_IS_PRIVILEGE(r))
return log_error_errno(r, "Failed to make loopback device of future partition %" PRIu64 ": %m", p->partno);
if (r >= 0) {
t->loop = TAKE_PTR(d);
*ret = TAKE_PTR(t);
return 0;
}
/* If we can't allocate a loop device, let's write to a regular file that we copy into the final
* image so we can run in containers and without needing root privileges. On filesystems with
* reflinking support, we can take advantage of this and just reflink the result into the image.
*/
log_debug_errno(r, "No access to loop devices, falling back to a regular file");
r = prepare_temporary_file(t, size);
if (r < 0)
return r;
*ret = TAKE_PTR(t);
return 0;
}
static int partition_target_grow(PartitionTarget *t, uint64_t size) {
int r;
assert(t);
if (t->loop) {
r = loop_device_refresh_size(t->loop, UINT64_MAX, size);
if (r < 0)
return log_error_errno(r, "Failed to refresh loopback device size: %m");
} else if (t->fd >= 0) {
if (ftruncate(t->fd, size) < 0)
return log_error_errno(errno, "Failed to grow '%s' to %s by truncation: %m",
t->path, FORMAT_BYTES(size));
}
return 0;
}
static int partition_target_sync(Context *context, Partition *p, PartitionTarget *t) {
int whole_fd, r;
assert(context);
assert(p);
assert(t);
assert_se((whole_fd = fdisk_get_devfd(context->fdisk_context)) >= 0);
if (t->loop) {
r = loop_device_sync(t->loop);
if (r < 0)
return log_error_errno(r, "Failed to sync loopback device: %m");
} else if (t->fd >= 0) {
struct stat st;
if (lseek(whole_fd, p->offset, SEEK_SET) == (off_t) -1)
return log_error_errno(errno, "Failed to seek to partition offset: %m");
if (lseek(t->fd, 0, SEEK_SET) == (off_t) -1)
return log_error_errno(errno, "Failed to seek to start of temporary file: %m");
if (fstat(t->fd, &st) < 0)
return log_error_errno(errno, "Failed to stat temporary file: %m");
if (st.st_size > (off_t) p->new_size)
return log_error_errno(SYNTHETIC_ERRNO(ENOSPC),
"Partition %" PRIu64 "'s contents (%s) don't fit in the partition (%s)",
p->partno, FORMAT_BYTES(st.st_size), FORMAT_BYTES(p->new_size));
r = copy_bytes(t->fd, whole_fd, UINT64_MAX, COPY_REFLINK|COPY_HOLES|COPY_FSYNC);
if (r < 0)
return log_error_errno(r, "Failed to copy bytes to partition: %m");
} else {
if (fsync(t->whole_fd) < 0)
return log_error_errno(errno, "Failed to sync changes: %m");
}
return 0;
}
static int partition_encrypt(Context *context, Partition *p, const char *node) {
#if HAVE_LIBCRYPTSETUP && HAVE_CRYPT_SET_DATA_OFFSET && HAVE_CRYPT_REENCRYPT_INIT_BY_PASSPHRASE && HAVE_CRYPT_REENCRYPT
struct crypt_params_luks2 luks_params = {
.label = strempty(ASSERT_PTR(p)->new_label),
.sector_size = ASSERT_PTR(context)->sector_size,
.data_device = node,
};
struct crypt_params_reencrypt reencrypt_params = {
.mode = CRYPT_REENCRYPT_ENCRYPT,
.direction = CRYPT_REENCRYPT_BACKWARD,
.resilience = "datashift",
.data_shift = LUKS2_METADATA_SIZE / 512,
.luks2 = &luks_params,
.flags = CRYPT_REENCRYPT_INITIALIZE_ONLY|CRYPT_REENCRYPT_MOVE_FIRST_SEGMENT,
};
_cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
_cleanup_(erase_and_freep) char *base64_encoded = NULL;
_cleanup_fclose_ FILE *h = NULL;
_cleanup_free_ char *hp = NULL;
const char *passphrase = NULL;
size_t passphrase_size = 0;
const char *vt;
int r;
assert(context);
assert(p);
assert(p->encrypt != ENCRYPT_OFF);
r = dlopen_cryptsetup();
if (r < 0)
return log_error_errno(r, "libcryptsetup not found, cannot encrypt: %m");
log_info("Encrypting future partition %" PRIu64 "...", p->partno);
r = var_tmp_dir(&vt);
if (r < 0)
return log_error_errno(r, "Failed to determine temporary files directory: %m");
r = fopen_temporary_child(vt, &h, &hp);
if (r < 0)
return log_error_errno(r, "Failed to create temporary LUKS header file: %m");
/* Weird cryptsetup requirement which requires the header file to be the size of at least one sector. */
r = ftruncate(fileno(h), context->sector_size);
if (r < 0)
return log_error_errno(r, "Failed to grow temporary LUKS header file: %m");
r = sym_crypt_init(&cd, hp);
if (r < 0)
return log_error_errno(r, "Failed to allocate libcryptsetup context for %s: %m", hp);
cryptsetup_enable_logging(cd);
/* Disable kernel keyring usage by libcryptsetup as a workaround for
* https://gitlab.com/cryptsetup/cryptsetup/-/merge_requests/273. This makes sure that we can do
* offline encryption even when repart is running in a container. */
r = sym_crypt_volume_key_keyring(cd, false);
if (r < 0)
return log_error_errno(r, "Failed to disable kernel keyring: %m");
r = sym_crypt_metadata_locking(cd, false);
if (r < 0)
return log_error_errno(r, "Failed to disable metadata locking: %m");
r = sym_crypt_set_data_offset(cd, LUKS2_METADATA_SIZE / 512);
if (r < 0)
return log_error_errno(r, "Failed to set data offset: %m");
r = sym_crypt_format(cd,
CRYPT_LUKS2,
"aes",
"xts-plain64",
SD_ID128_TO_UUID_STRING(p->luks_uuid),
NULL,
VOLUME_KEY_SIZE,
&luks_params);
if (r < 0)
return log_error_errno(r, "Failed to LUKS2 format future partition: %m");
if (IN_SET(p->encrypt, ENCRYPT_KEY_FILE, ENCRYPT_KEY_FILE_TPM2)) {
r = sym_crypt_keyslot_add_by_volume_key(
cd,
CRYPT_ANY_SLOT,
NULL,
VOLUME_KEY_SIZE,
strempty(arg_key),
arg_key_size);
if (r < 0)
return log_error_errno(r, "Failed to add LUKS2 key: %m");
passphrase = strempty(arg_key);
passphrase_size = arg_key_size;
}
if (IN_SET(p->encrypt, ENCRYPT_TPM2, ENCRYPT_KEY_FILE_TPM2)) {
#if HAVE_TPM2
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
_cleanup_(erase_and_freep) void *secret = NULL;
_cleanup_free_ void *pubkey = NULL;
_cleanup_free_ void *blob = NULL, *hash = NULL;
size_t secret_size, blob_size, hash_size, pubkey_size = 0;
ssize_t base64_encoded_size;
uint16_t pcr_bank, primary_alg;
int keyslot;
if (arg_tpm2_public_key_pcr_mask != 0) {
r = tpm2_load_pcr_public_key(arg_tpm2_public_key, &pubkey, &pubkey_size);
if (r < 0) {
if (arg_tpm2_public_key || r != -ENOENT)
return log_error_errno(r, "Failed read TPM PCR public key: %m");
log_debug_errno(r, "Failed to read TPM2 PCR public key, proceeding without: %m");
arg_tpm2_public_key_pcr_mask = 0;
}
}
r = tpm2_seal(arg_tpm2_device,
arg_tpm2_pcr_mask,
pubkey, pubkey_size,
arg_tpm2_public_key_pcr_mask,
/* pin= */ NULL,
&secret, &secret_size,
&blob, &blob_size,
&hash, &hash_size,
&pcr_bank,
&primary_alg);
if (r < 0)
return log_error_errno(r, "Failed to seal to TPM2: %m");
base64_encoded_size = base64mem(secret, secret_size, &base64_encoded);
if (base64_encoded_size < 0)
return log_error_errno(base64_encoded_size, "Failed to base64 encode secret key: %m");
r = cryptsetup_set_minimal_pbkdf(cd);
if (r < 0)
return log_error_errno(r, "Failed to set minimal PBKDF: %m");
keyslot = sym_crypt_keyslot_add_by_volume_key(
cd,
CRYPT_ANY_SLOT,
NULL,
VOLUME_KEY_SIZE,
base64_encoded,
base64_encoded_size);
if (keyslot < 0)
return log_error_errno(keyslot, "Failed to add new TPM2 key: %m");
r = tpm2_make_luks2_json(
keyslot,
arg_tpm2_pcr_mask,
pcr_bank,
pubkey, pubkey_size,
arg_tpm2_public_key_pcr_mask,
primary_alg,
blob, blob_size,
hash, hash_size,
NULL, 0, /* no salt because tpm2_seal has no pin */
0,
&v);
if (r < 0)
return log_error_errno(r, "Failed to prepare TPM2 JSON token object: %m");
r = cryptsetup_add_token_json(cd, v);
if (r < 0)
return log_error_errno(r, "Failed to add TPM2 JSON token to LUKS2 header: %m");
passphrase = base64_encoded;
passphrase_size = strlen(base64_encoded);
#else
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"Support for TPM2 enrollment not enabled.");
#endif
}
r = sym_crypt_reencrypt_init_by_passphrase(
cd,
NULL,
passphrase,
passphrase_size,
CRYPT_ANY_SLOT,
0,
sym_crypt_get_cipher(cd),
sym_crypt_get_cipher_mode(cd),
&reencrypt_params);
if (r < 0)
return log_error_errno(r, "Failed to prepare for reencryption: %m");
/* crypt_reencrypt_init_by_passphrase() doesn't actually put the LUKS header at the front, we have
* to do that ourselves. */
sym_crypt_free(cd);
cd = NULL;
r = sym_crypt_init(&cd, node);
if (r < 0)
return log_error_errno(r, "Failed to allocate libcryptsetup context for %s: %m", node);
r = sym_crypt_header_restore(cd, CRYPT_LUKS2, hp);
if (r < 0)
return log_error_errno(r, "Failed to place new LUKS header at head of %s: %m", node);
reencrypt_params.flags &= ~CRYPT_REENCRYPT_INITIALIZE_ONLY;
r = sym_crypt_reencrypt_init_by_passphrase(
cd,
NULL,
passphrase,
passphrase_size,
CRYPT_ANY_SLOT,
0,
NULL,
NULL,
&reencrypt_params);
if (r < 0)
return log_error_errno(r, "Failed to load reencryption context: %m");
r = sym_crypt_reencrypt(cd, NULL);
if (r < 0)
return log_error_errno(r, "Failed to encrypt %s: %m", node);
log_info("Successfully encrypted future partition %" PRIu64 ".", p->partno);
return 0;
#else
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"libcryptsetup is not supported or is missing required symbols, cannot encrypt: %m");
#endif
}
static int partition_format_verity_hash(
Context *context,
Partition *p,
const char *data_node) {
#if HAVE_LIBCRYPTSETUP
Partition *dp;
_cleanup_(partition_target_freep) PartitionTarget *t = NULL;
_cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL;
_cleanup_free_ uint8_t *rh = NULL;
size_t rhs;
int r;
assert(context);
assert(p);
assert(data_node);
if (p->dropped)
return 0;
if (PARTITION_EXISTS(p)) /* Never format existing partitions */
return 0;
if (p->verity != VERITY_HASH)
return 0;
if (partition_defer(p))
return 0;
assert_se(dp = p->siblings[VERITY_DATA]);
assert(!dp->dropped);
r = dlopen_cryptsetup();
if (r < 0)
return log_error_errno(r, "libcryptsetup not found, cannot setup verity: %m");
r = partition_target_prepare(context, p, p->new_size, /*need_path=*/ true, &t);
if (r < 0)
return r;
r = sym_crypt_init(&cd, partition_target_path(t));
if (r < 0)
return log_error_errno(r, "Failed to allocate libcryptsetup context: %m");
cryptsetup_enable_logging(cd);
r = sym_crypt_format(
cd, CRYPT_VERITY, NULL, NULL, NULL, NULL, 0,
&(struct crypt_params_verity){
.data_device = data_node,
.flags = CRYPT_VERITY_CREATE_HASH,
.hash_name = "sha256",
.hash_type = 1,
.data_block_size = context->sector_size,
.hash_block_size = context->sector_size,
.salt_size = 32,
});
if (r < 0) {
/* libcryptsetup reports non-descriptive EIO errors for every I/O failure. Luckily, it
* doesn't clobber errno so let's check for ENOSPC so we can report a better error if the
* partition is too small. */
if (r == -EIO && errno == ENOSPC)
return log_error_errno(errno,
"Verity hash data does not fit in partition %"PRIu64" with size %s",
p->partno, FORMAT_BYTES(p->new_size));
return log_error_errno(r, "Failed to setup verity hash data: %m");
}
r = partition_target_sync(context, p, t);
if (r < 0)
return r;
r = sym_crypt_get_volume_key_size(cd);
if (r < 0)
return log_error_errno(r, "Failed to determine verity root hash size: %m");
rhs = (size_t) r;
rh = malloc(rhs);
if (!rh)
return log_oom();
r = sym_crypt_volume_key_get(cd, CRYPT_ANY_SLOT, (char *) rh, &rhs, NULL, 0);
if (r < 0)
return log_error_errno(r, "Failed to get verity root hash: %m");
assert(rhs >= sizeof(sd_id128_t) * 2);
if (!dp->new_uuid_is_set) {
memcpy_safe(dp->new_uuid.bytes, rh, sizeof(sd_id128_t));
dp->new_uuid_is_set = true;
}
if (!p->new_uuid_is_set) {
memcpy_safe(p->new_uuid.bytes, rh + rhs - sizeof(sd_id128_t), sizeof(sd_id128_t));
p->new_uuid_is_set = true;
}
p->roothash = TAKE_PTR(rh);
p->roothash_size = rhs;
return 0;
#else
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "libcryptsetup is not supported, cannot setup verity hashes: %m");
#endif
}
static int sign_verity_roothash(
const uint8_t *roothash,
size_t roothash_size,
uint8_t **ret_signature,
size_t *ret_signature_size) {
#if HAVE_OPENSSL
_cleanup_(BIO_freep) BIO *rb = NULL;
_cleanup_(PKCS7_freep) PKCS7 *p7 = NULL;
_cleanup_free_ char *hex = NULL;
_cleanup_free_ uint8_t *sig = NULL;
int sigsz;
assert(roothash);
assert(roothash_size > 0);
assert(ret_signature);
assert(ret_signature_size);
hex = hexmem(roothash, roothash_size);
if (!hex)
return log_oom();
rb = BIO_new_mem_buf(hex, -1);
if (!rb)
return log_oom();
p7 = PKCS7_sign(arg_certificate, arg_private_key, NULL, rb, PKCS7_DETACHED|PKCS7_NOATTR|PKCS7_BINARY);
if (!p7)
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to calculate PKCS7 signature: %s",
ERR_error_string(ERR_get_error(), NULL));
sigsz = i2d_PKCS7(p7, &sig);
if (sigsz < 0)
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to convert PKCS7 signature to DER: %s",
ERR_error_string(ERR_get_error(), NULL));
*ret_signature = TAKE_PTR(sig);
*ret_signature_size = sigsz;
return 0;
#else
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "openssl is not supported, cannot setup verity signature: %m");
#endif
}
static int partition_format_verity_sig(Context *context, Partition *p) {
_cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
_cleanup_free_ uint8_t *sig = NULL;
_cleanup_free_ char *text = NULL;
Partition *hp;
uint8_t fp[X509_FINGERPRINT_SIZE];
size_t sigsz = 0; /* avoid false maybe-uninitialized warning */
int whole_fd, r;
assert(p->verity == VERITY_SIG);
if (p->dropped)
return 0;
if (PARTITION_EXISTS(p))
return 0;
if (partition_defer(p))
return 0;
assert_se(hp = p->siblings[VERITY_HASH]);
assert(!hp->dropped);
assert(arg_certificate);
assert_se((whole_fd = fdisk_get_devfd(context->fdisk_context)) >= 0);
r = sign_verity_roothash(hp->roothash, hp->roothash_size, &sig, &sigsz);
if (r < 0)
return r;
r = x509_fingerprint(arg_certificate, fp);
if (r < 0)
return log_error_errno(r, "Unable to calculate X509 certificate fingerprint: %m");
r = json_build(&v,
JSON_BUILD_OBJECT(
JSON_BUILD_PAIR("rootHash", JSON_BUILD_HEX(hp->roothash, hp->roothash_size)),
JSON_BUILD_PAIR(
"certificateFingerprint",
JSON_BUILD_HEX(fp, sizeof(fp))
),
JSON_BUILD_PAIR("signature", JSON_BUILD_BASE64(sig, sigsz))
)
);
if (r < 0)
return log_error_errno(r, "Failed to build JSON object: %m");
r = json_variant_format(v, 0, &text);
if (r < 0)
return log_error_errno(r, "Failed to format JSON object: %m");
r = strgrowpad0(&text, p->new_size);
if (r < 0)
return log_error_errno(r, "Failed to pad string to %s", FORMAT_BYTES(p->new_size));
if (lseek(whole_fd, p->offset, SEEK_SET) == (off_t) -1)
return log_error_errno(errno, "Failed to seek to partition offset: %m");
r = loop_write(whole_fd, text, p->new_size, /*do_poll=*/ false);
if (r < 0)
return log_error_errno(r, "Failed to write verity signature to partition: %m");
if (fsync(whole_fd) < 0)
return log_error_errno(errno, "Failed to synchronize verity signature JSON: %m");
return 0;
}
static int context_copy_blocks(Context *context) {
int r;
assert(context);
/* Copy in file systems on the block level */
LIST_FOREACH(partitions, p, context->partitions) {
_cleanup_(partition_target_freep) PartitionTarget *t = NULL;
if (p->copy_blocks_fd < 0)
continue;
if (p->dropped)
continue;
if (PARTITION_EXISTS(p)) /* Never copy over existing partitions */
continue;
if (partition_defer(p))
continue;
assert(p->new_size != UINT64_MAX);
assert(p->copy_blocks_size != UINT64_MAX);
assert(p->new_size >= p->copy_blocks_size + (p->encrypt != ENCRYPT_OFF ? LUKS2_METADATA_KEEP_FREE : 0));
r = partition_target_prepare(context, p, p->new_size,
/*need_path=*/ p->encrypt != ENCRYPT_OFF || p->siblings[VERITY_HASH],
&t);
if (r < 0)
return r;
log_info("Copying in '%s' (%s) on block level into future partition %" PRIu64 ".",
p->copy_blocks_path, FORMAT_BYTES(p->copy_blocks_size), p->partno);
r = copy_bytes(p->copy_blocks_fd, partition_target_fd(t), p->copy_blocks_size, COPY_REFLINK);
if (r < 0)
return log_error_errno(r, "Failed to copy in data from '%s': %m", p->copy_blocks_path);
if (p->encrypt != ENCRYPT_OFF) {
r = partition_encrypt(context, p, partition_target_path(t));
if (r < 0)
return r;
}
r = partition_target_sync(context, p, t);
if (r < 0)
return r;
log_info("Copying in of '%s' on block level completed.", p->copy_blocks_path);
if (p->siblings[VERITY_HASH]) {
r = partition_format_verity_hash(context, p->siblings[VERITY_HASH],
partition_target_path(t));
if (r < 0)
return r;
}
if (p->siblings[VERITY_SIG]) {
r = partition_format_verity_sig(context, p->siblings[VERITY_SIG]);
if (r < 0)
return r;
}
}
return 0;
}
static int do_copy_files(Partition *p, const char *root, const Set *denylist) {
int r;
assert(p);
assert(root);
STRV_FOREACH_PAIR(source, target, p->copy_files) {
_cleanup_close_ int sfd = -EBADF, pfd = -EBADF, tfd = -EBADF;
sfd = chase_symlinks_and_open(*source, arg_root, CHASE_PREFIX_ROOT, O_CLOEXEC|O_NOCTTY, NULL);
if (sfd < 0)
return log_error_errno(sfd, "Failed to open source file '%s%s': %m", strempty(arg_root), *source);
r = fd_verify_regular(sfd);
if (r < 0) {
if (r != -EISDIR)
return log_error_errno(r, "Failed to check type of source file '%s': %m", *source);
/* We are looking at a directory */
tfd = chase_symlinks_and_open(*target, root, CHASE_PREFIX_ROOT, O_RDONLY|O_DIRECTORY|O_CLOEXEC, NULL);
if (tfd < 0) {
_cleanup_free_ char *dn = NULL, *fn = NULL;
if (tfd != -ENOENT)
return log_error_errno(tfd, "Failed to open target directory '%s': %m", *target);
r = path_extract_filename(*target, &fn);
if (r < 0)
return log_error_errno(r, "Failed to extract filename from '%s': %m", *target);
r = path_extract_directory(*target, &dn);
if (r < 0)
return log_error_errno(r, "Failed to extract directory from '%s': %m", *target);
r = mkdir_p_root(root, dn, UID_INVALID, GID_INVALID, 0755);
if (r < 0)
return log_error_errno(r, "Failed to create parent directory '%s': %m", dn);
pfd = chase_symlinks_and_open(dn, root, CHASE_PREFIX_ROOT, O_RDONLY|O_DIRECTORY|O_CLOEXEC, NULL);
if (pfd < 0)
return log_error_errno(pfd, "Failed to open parent directory of target: %m");
/* Make sure everything is owned by the user running repart so that
* make_filesystem() can map the user running repart to "root" in a user
* namespace to have the files owned by root in the final image. */
r = copy_tree_at(
sfd, ".",
pfd, fn,
UID_INVALID, GID_INVALID,
COPY_REFLINK|COPY_HOLES|COPY_MERGE|COPY_REPLACE|COPY_SIGINT|COPY_HARDLINKS|COPY_ALL_XATTRS|COPY_GRACEFUL_WARN,
denylist);
} else
r = copy_tree_at(
sfd, ".",
tfd, ".",
UID_INVALID, GID_INVALID,
COPY_REFLINK|COPY_HOLES|COPY_MERGE|COPY_REPLACE|COPY_SIGINT|COPY_HARDLINKS|COPY_ALL_XATTRS|COPY_GRACEFUL_WARN,
denylist);
if (r < 0)
return log_error_errno(r, "Failed to copy '%s%s' to '%s%s': %m",
strempty(arg_root), *source, strempty(root), *target);
} else {
_cleanup_free_ char *dn = NULL, *fn = NULL;
/* We are looking at a regular file */
r = path_extract_filename(*target, &fn);
if (r == -EADDRNOTAVAIL || r == O_DIRECTORY)
return log_error_errno(SYNTHETIC_ERRNO(EISDIR),
"Target path '%s' refers to a directory, but source path '%s' refers to regular file, can't copy.", *target, *source);
if (r < 0)
return log_error_errno(r, "Failed to extract filename from '%s': %m", *target);
r = path_extract_directory(*target, &dn);
if (r < 0)
return log_error_errno(r, "Failed to extract directory from '%s': %m", *target);
r = mkdir_p_root(root, dn, UID_INVALID, GID_INVALID, 0755);
if (r < 0)
return log_error_errno(r, "Failed to create parent directory: %m");
pfd = chase_symlinks_and_open(dn, root, CHASE_PREFIX_ROOT, O_RDONLY|O_DIRECTORY|O_CLOEXEC, NULL);
if (pfd < 0)
return log_error_errno(pfd, "Failed to open parent directory of target: %m");
tfd = openat(pfd, fn, O_CREAT|O_EXCL|O_WRONLY|O_CLOEXEC, 0700);
if (tfd < 0)
return log_error_errno(errno, "Failed to create target file '%s': %m", *target);
r = copy_bytes(sfd, tfd, UINT64_MAX, COPY_REFLINK|COPY_HOLES|COPY_SIGINT);
if (r < 0)
return log_error_errno(r, "Failed to copy '%s' to '%s%s': %m", *source, strempty(arg_root), *target);
(void) copy_xattr(sfd, tfd, COPY_ALL_XATTRS);
(void) copy_access(sfd, tfd);
(void) copy_times(sfd, tfd, 0);
}
}
return 0;
}
static int do_make_directories(Partition *p, const char *root) {
int r;
assert(p);
assert(root);
STRV_FOREACH(d, p->make_directories) {
r = mkdir_p_root(root, *d, UID_INVALID, GID_INVALID, 0755);
if (r < 0)
return log_error_errno(r, "Failed to create directory '%s' in file system: %m", *d);
}
return 0;
}
static bool partition_needs_populate(Partition *p) {
assert(p);
return !strv_isempty(p->copy_files) || !strv_isempty(p->make_directories);
}
static int partition_populate_directory(Partition *p, const Set *denylist, char **ret) {
_cleanup_(rm_rf_physical_and_freep) char *root = NULL;
_cleanup_close_ int rfd = -EBADF;
int r;
assert(ret);
rfd = mkdtemp_open("/var/tmp/repart-XXXXXX", 0, &root);
if (rfd < 0)
return log_error_errno(rfd, "Failed to create temporary directory: %m");
if (fchmod(rfd, 0755) < 0)
return log_error_errno(errno, "Failed to change mode of temporary directory: %m");
r = do_copy_files(p, root, denylist);
if (r < 0)
return r;
r = do_make_directories(p, root);
if (r < 0)
return r;
*ret = TAKE_PTR(root);
return 0;
}
static int partition_populate_filesystem(Partition *p, const char *node, const Set *denylist) {
int r;
assert(p);
assert(node);
log_info("Populating %s filesystem with files.", p->format);
/* We copy in a child process, since we have to mount the fs for that, and we don't want that fs to
* appear in the host namespace. Hence we fork a child that has its own file system namespace and
* detached mount propagation. */
r = safe_fork("(sd-copy)", FORK_DEATHSIG|FORK_LOG|FORK_WAIT|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE, NULL);
if (r < 0)
return r;
if (r == 0) {
static const char fs[] = "/run/systemd/mount-root";
/* This is a child process with its own mount namespace and propagation to host turned off */
r = mkdir_p(fs, 0700);
if (r < 0) {
log_error_errno(r, "Failed to create mount point: %m");
_exit(EXIT_FAILURE);
}
if (mount_nofollow_verbose(LOG_ERR, node, fs, p->format, MS_NOATIME|MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL) < 0)
_exit(EXIT_FAILURE);
if (do_copy_files(p, fs, denylist) < 0)
_exit(EXIT_FAILURE);
if (do_make_directories(p, fs) < 0)
_exit(EXIT_FAILURE);
r = syncfs_path(AT_FDCWD, fs);
if (r < 0) {
log_error_errno(r, "Failed to synchronize written files: %m");
_exit(EXIT_FAILURE);
}
_exit(EXIT_SUCCESS);
}
log_info("Successfully populated %s filesystem with files.", p->format);
return 0;
}
static int make_copy_files_denylist(Context *context, Set **ret) {
_cleanup_set_free_ Set *denylist = NULL;
int r;
assert(context);
assert(ret);
LIST_FOREACH(partitions, p, context->partitions) {
const char *sources = gpt_partition_type_mountpoint_nulstr(p->type);
if (!sources)
continue;
NULSTR_FOREACH(s, sources) {
_cleanup_free_ char *d = NULL;
struct stat st;
r = chase_symlinks_and_stat(s, arg_root, CHASE_PREFIX_ROOT, NULL, &st, NULL);
if (r == -ENOENT)
continue;
if (r < 0)
return log_error_errno(r, "Failed to stat source file '%s%s': %m",
strempty(arg_root), s);
if (set_contains(denylist, &st))
continue;
d = memdup(&st, sizeof(st));
if (!d)
return log_oom();
if (set_ensure_put(&denylist, &inode_hash_ops, d) < 0)
return log_oom();
TAKE_PTR(d);
}
}
*ret = TAKE_PTR(denylist);
return 0;
}
static int context_mkfs(Context *context) {
_cleanup_set_free_ Set *denylist = NULL;
int r;
assert(context);
/* Make a file system */
r = make_copy_files_denylist(context, &denylist);
if (r < 0)
return r;
LIST_FOREACH(partitions, p, context->partitions) {
_cleanup_(rm_rf_physical_and_freep) char *root = NULL;
_cleanup_(partition_target_freep) PartitionTarget *t = NULL;
if (p->dropped)
continue;
if (PARTITION_EXISTS(p)) /* Never format existing partitions */
continue;
if (!p->format)
continue;
/* Minimized partitions will use the copy blocks logic so let's make sure to skip those here. */
if (p->copy_blocks_fd >= 0)
continue;
if (partition_defer(p))
continue;
assert(p->offset != UINT64_MAX);
assert(p->new_size != UINT64_MAX);
assert(p->new_size >= (p->encrypt != ENCRYPT_OFF ? LUKS2_METADATA_KEEP_FREE : 0));
/* If we're doing encryption, we make sure we keep free space at the end which is required
* for cryptsetup's offline encryption. */
r = partition_target_prepare(context, p,
p->new_size - (p->encrypt != ENCRYPT_OFF ? LUKS2_METADATA_KEEP_FREE : 0),
/*need_path=*/ true,
&t);
if (r < 0)
return r;
log_info("Formatting future partition %" PRIu64 ".", p->partno);
/* If we're not writing to a loop device or if we're populating a read-only filesystem, we
* have to populate using the filesystem's mkfs's --root (or equivalent) option. To do that,
* we need to set up the final directory tree beforehand. */
if (partition_needs_populate(p) && (!t->loop || fstype_is_ro(p->format))) {
if (!mkfs_supports_root_option(p->format))
return log_error_errno(SYNTHETIC_ERRNO(ENODEV),
"Loop device access is required to populate %s filesystems.",
p->format);
r = partition_populate_directory(p, denylist, &root);
if (r < 0)
return r;
}
r = make_filesystem(partition_target_path(t), p->format, strempty(p->new_label), root,
p->fs_uuid, arg_discard, context->sector_size, NULL);
if (r < 0)
return r;
log_info("Successfully formatted future partition %" PRIu64 ".", p->partno);
/* If we're writing to a loop device, we can now mount the empty filesystem and populate it. */
if (partition_needs_populate(p) && !root) {
assert(t->loop);
r = partition_populate_filesystem(p, t->loop->node, denylist);
if (r < 0)
return r;
}
if (p->encrypt != ENCRYPT_OFF) {
r = partition_target_grow(t, p->new_size);
if (r < 0)
return r;
r = partition_encrypt(context, p, partition_target_path(t));
if (r < 0)
return log_error_errno(r, "Failed to encrypt device: %m");
}
/* Note that we always sync explicitly here, since mkfs.fat doesn't do that on its own, and
* if we don't sync before detaching a block device the in-flight sectors possibly won't hit
* the disk. */
r = partition_target_sync(context, p, t);
if (r < 0)
return r;
if (p->siblings[VERITY_HASH]) {
r = partition_format_verity_hash(context, p->siblings[VERITY_HASH],
partition_target_path(t));
if (r < 0)
return r;
}
if (p->siblings[VERITY_SIG]) {
r = partition_format_verity_sig(context, p->siblings[VERITY_SIG]);
if (r < 0)
return r;
}
}
return 0;
}
static int parse_x509_certificate(const char *certificate, size_t certificate_size, X509 **ret) {
#if HAVE_OPENSSL
_cleanup_(X509_freep) X509 *cert = NULL;
_cleanup_(BIO_freep) BIO *cb = NULL;
assert(certificate);
assert(certificate_size > 0);
assert(ret);
cb = BIO_new_mem_buf(certificate, certificate_size);
if (!cb)
return log_oom();
cert = PEM_read_bio_X509(cb, NULL, NULL, NULL);
if (!cert)
return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), "Failed to parse X.509 certificate: %s",
ERR_error_string(ERR_get_error(), NULL));
if (ret)
*ret = TAKE_PTR(cert);
return 0;
#else
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "openssl is not supported, cannot parse X509 certificate.");
#endif
}
static int parse_private_key(const char *key, size_t key_size, EVP_PKEY **ret) {
#if HAVE_OPENSSL
_cleanup_(BIO_freep) BIO *kb = NULL;
_cleanup_(EVP_PKEY_freep) EVP_PKEY *pk = NULL;
assert(key);
assert(key_size > 0);
assert(ret);
kb = BIO_new_mem_buf(key, key_size);
if (!kb)
return log_oom();
pk = PEM_read_bio_PrivateKey(kb, NULL, NULL, NULL);
if (!pk)
return log_error_errno(SYNTHETIC_ERRNO(EIO), "Failed to parse PEM private key: %s",
ERR_error_string(ERR_get_error(), NULL));
if (ret)
*ret = TAKE_PTR(pk);
return 0;
#else
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "openssl is not supported, cannot parse private key.");
#endif
}
static int partition_acquire_uuid(Context *context, Partition *p, sd_id128_t *ret) {
struct {
sd_id128_t type_uuid;
uint64_t counter;
} _packed_ plaintext = {};
union {
uint8_t md[SHA256_DIGEST_SIZE];
sd_id128_t id;
} result;
uint64_t k = 0;
int r;
assert(context);
assert(p);
assert(ret);
/* Calculate a good UUID for the indicated partition. We want a certain degree of reproducibility,
* hence we won't generate the UUIDs randomly. Instead we use a cryptographic hash (precisely:
* HMAC-SHA256) to derive them from a single seed. The seed is generally the machine ID of the
* installation we are processing, but if random behaviour is desired can be random, too. We use the
* seed value as key for the HMAC (since the machine ID is something we generally don't want to leak)
* and the partition type as plaintext. The partition type is suffixed with a counter (only for the
* second and later partition of the same type) if we have more than one partition of the same
* time. Or in other words:
*
* With:
* SEED := /etc/machine-id
*
* If first partition instance of type TYPE_UUID:
* PARTITION_UUID := HMAC-SHA256(SEED, TYPE_UUID)
*
* For all later partition instances of type TYPE_UUID with INSTANCE being the LE64 encoded instance number:
* PARTITION_UUID := HMAC-SHA256(SEED, TYPE_UUID || INSTANCE)
*/
LIST_FOREACH(partitions, q, context->partitions) {
if (p == q)
break;
if (!sd_id128_equal(p->type.uuid, q->type.uuid))
continue;
k++;
}
plaintext.type_uuid = p->type.uuid;
plaintext.counter = htole64(k);
hmac_sha256(context->seed.bytes, sizeof(context->seed.bytes),
&plaintext,
k == 0 ? sizeof(sd_id128_t) : sizeof(plaintext),
result.md);
/* Take the first half, mark it as v4 UUID */
assert_cc(sizeof(result.md) == sizeof(result.id) * 2);
result.id = id128_make_v4_uuid(result.id);
/* Ensure this partition UUID is actually unique, and there's no remaining partition from an earlier run? */
LIST_FOREACH(partitions, q, context->partitions) {
if (p == q)
continue;
if (sd_id128_in_set(result.id, q->current_uuid, q->new_uuid)) {
log_warning("Partition UUID calculated from seed for partition %" PRIu64 " already used, reverting to randomized UUID.", p->partno);
r = sd_id128_randomize(&result.id);
if (r < 0)
return log_error_errno(r, "Failed to generate randomized UUID: %m");
break;
}
}
*ret = result.id;
return 0;
}
static int partition_acquire_label(Context *context, Partition *p, char **ret) {
_cleanup_free_ char *label = NULL;
const char *prefix;
unsigned k = 1;
assert(context);
assert(p);
assert(ret);
prefix = gpt_partition_type_uuid_to_string(p->type.uuid);
if (!prefix)
prefix = "linux";
for (;;) {
const char *ll = label ?: prefix;
bool retry = false;
LIST_FOREACH(partitions, q, context->partitions) {
if (p == q)
break;
if (streq_ptr(ll, q->current_label) ||
streq_ptr(ll, q->new_label)) {
retry = true;
break;
}
}
if (!retry)
break;
label = mfree(label);
if (asprintf(&label, "%s-%u", prefix, ++k) < 0)
return log_oom();
}
if (!label) {
label = strdup(prefix);
if (!label)
return log_oom();
}
*ret = TAKE_PTR(label);
return 0;
}
static int context_acquire_partition_uuids_and_labels(Context *context) {
int r;
assert(context);
LIST_FOREACH(partitions, p, context->partitions) {
sd_id128_t uuid;
/* Never touch foreign partitions */
if (PARTITION_IS_FOREIGN(p)) {
p->new_uuid = p->current_uuid;
if (p->current_label) {
r = free_and_strdup_warn(&p->new_label, strempty(p->current_label));
if (r < 0)
return r;
}
continue;
}
if (!sd_id128_is_null(p->current_uuid))
p->new_uuid = uuid = p->current_uuid; /* Never change initialized UUIDs */
else if (p->new_uuid_is_set)
uuid = p->new_uuid;
else {
/* Not explicitly set by user! */
r = partition_acquire_uuid(context, p, &uuid);
if (r < 0)
return r;
/* The final verity hash/data UUIDs can only be determined after formatting the
* verity hash partition. However, we still want to use the generated partition UUID
* to derive other UUIDs to keep things unique and reproducible, so we always
* generate a UUID if none is set, but we only use it as the actual partition UUID if
* verity is not configured. */
if (!IN_SET(p->verity, VERITY_DATA, VERITY_HASH)) {
p->new_uuid = uuid;
p->new_uuid_is_set = true;
}
}
/* Calculate the UUID for the file system as HMAC-SHA256 of the string "file-system-uuid",
* keyed off the partition UUID. */
r = derive_uuid(uuid, "file-system-uuid", &p->fs_uuid);
if (r < 0)
return r;
if (p->encrypt != ENCRYPT_OFF) {
r = derive_uuid(uuid, "luks-uuid", &p->luks_uuid);
if (r < 0)
return r;
}
if (!isempty(p->current_label)) {
/* never change initialized labels */
r = free_and_strdup_warn(&p->new_label, p->current_label);
if (r < 0)
return r;
} else if (!p->new_label) {
/* Not explicitly set by user! */
r = partition_acquire_label(context, p, &p->new_label);
if (r < 0)
return r;
}
}
return 0;
}
static int set_gpt_flags(struct fdisk_partition *q, uint64_t flags) {
_cleanup_free_ char *a = NULL;
for (unsigned i = 0; i < sizeof(flags) * 8; i++) {
uint64_t bit = UINT64_C(1) << i;
char buf[DECIMAL_STR_MAX(unsigned)+1];
if (!FLAGS_SET(flags, bit))
continue;
xsprintf(buf, "%u", i);
if (!strextend_with_separator(&a, ",", buf))
return -ENOMEM;
}
return fdisk_partition_set_attrs(q, a);
}
static uint64_t partition_merge_flags(Partition *p) {
uint64_t f;
assert(p);
f = p->gpt_flags;
if (p->no_auto >= 0) {
if (gpt_partition_type_knows_no_auto(p->type))
SET_FLAG(f, SD_GPT_FLAG_NO_AUTO, p->no_auto);
else {
char buffer[SD_ID128_UUID_STRING_MAX];
log_warning("Configured NoAuto=%s for partition type '%s' that doesn't support it, ignoring.",
yes_no(p->no_auto),
gpt_partition_type_uuid_to_string_harder(p->type.uuid, buffer));
}
}
if (p->read_only >= 0) {
if (gpt_partition_type_knows_read_only(p->type))
SET_FLAG(f, SD_GPT_FLAG_READ_ONLY, p->read_only);
else {
char buffer[SD_ID128_UUID_STRING_MAX];
log_warning("Configured ReadOnly=%s for partition type '%s' that doesn't support it, ignoring.",
yes_no(p->read_only),
gpt_partition_type_uuid_to_string_harder(p->type.uuid, buffer));
}
}
if (p->growfs >= 0) {
if (gpt_partition_type_knows_growfs(p->type))
SET_FLAG(f, SD_GPT_FLAG_GROWFS, p->growfs);
else {
char buffer[SD_ID128_UUID_STRING_MAX];
log_warning("Configured GrowFileSystem=%s for partition type '%s' that doesn't support it, ignoring.",
yes_no(p->growfs),
gpt_partition_type_uuid_to_string_harder(p->type.uuid, buffer));
}
}
return f;
}
static int context_mangle_partitions(Context *context) {
int r;
assert(context);
LIST_FOREACH(partitions, p, context->partitions) {
if (p->dropped)
continue;
if (partition_defer(p))
continue;
assert(p->new_size != UINT64_MAX);
assert(p->offset != UINT64_MAX);
assert(p->partno != UINT64_MAX);
if (PARTITION_EXISTS(p)) {
bool changed = false;
assert(p->current_partition);
if (p->new_size != p->current_size) {
assert(p->new_size >= p->current_size);
assert(p->new_size % context->sector_size == 0);
r = fdisk_partition_size_explicit(p->current_partition, true);
if (r < 0)
return log_error_errno(r, "Failed to enable explicit sizing: %m");
r = fdisk_partition_set_size(p->current_partition, p->new_size / context->sector_size);
if (r < 0)
return log_error_errno(r, "Failed to grow partition: %m");
log_info("Growing existing partition %" PRIu64 ".", p->partno);
changed = true;
}
if (!sd_id128_equal(p->new_uuid, p->current_uuid)) {
r = fdisk_partition_set_uuid(p->current_partition, SD_ID128_TO_UUID_STRING(p->new_uuid));
if (r < 0)
return log_error_errno(r, "Failed to set partition UUID: %m");
log_info("Initializing UUID of existing partition %" PRIu64 ".", p->partno);
changed = true;
}
if (!streq_ptr(p->new_label, p->current_label)) {
r = fdisk_partition_set_name(p->current_partition, strempty(p->new_label));
if (r < 0)
return log_error_errno(r, "Failed to set partition label: %m");
log_info("Setting partition label of existing partition %" PRIu64 ".", p->partno);
changed = true;
}
if (changed) {
assert(!PARTITION_IS_FOREIGN(p)); /* never touch foreign partitions */
r = fdisk_set_partition(context->fdisk_context, p->partno, p->current_partition);
if (r < 0)
return log_error_errno(r, "Failed to update partition: %m");
}
} else {
_cleanup_(fdisk_unref_partitionp) struct fdisk_partition *q = NULL;
_cleanup_(fdisk_unref_parttypep) struct fdisk_parttype *t = NULL;
assert(!p->new_partition);
assert(p->offset % context->sector_size == 0);
assert(p->new_size % context->sector_size == 0);
assert(p->new_label);
t = fdisk_new_parttype();
if (!t)
return log_oom();
r = fdisk_parttype_set_typestr(t, SD_ID128_TO_UUID_STRING(p->type.uuid));
if (r < 0)
return log_error_errno(r, "Failed to initialize partition type: %m");
q = fdisk_new_partition();
if (!q)
return log_oom();
r = fdisk_partition_set_type(q, t);
if (r < 0)
return log_error_errno(r, "Failed to set partition type: %m");
r = fdisk_partition_size_explicit(q, true);
if (r < 0)
return log_error_errno(r, "Failed to enable explicit sizing: %m");
r = fdisk_partition_set_start(q, p->offset / context->sector_size);
if (r < 0)
return log_error_errno(r, "Failed to position partition: %m");
r = fdisk_partition_set_size(q, p->new_size / context->sector_size);
if (r < 0)
return log_error_errno(r, "Failed to grow partition: %m");
r = fdisk_partition_set_partno(q, p->partno);
if (r < 0)
return log_error_errno(r, "Failed to set partition number: %m");
r = fdisk_partition_set_uuid(q, SD_ID128_TO_UUID_STRING(p->new_uuid));
if (r < 0)
return log_error_errno(r, "Failed to set partition UUID: %m");
r = fdisk_partition_set_name(q, strempty(p->new_label));
if (r < 0)
return log_error_errno(r, "Failed to set partition label: %m");
/* Merge the no auto + read only + growfs setting with the literal flags, and set them for the partition */
r = set_gpt_flags(q, partition_merge_flags(p));
if (r < 0)
return log_error_errno(r, "Failed to set GPT partition flags: %m");
log_info("Adding new partition %" PRIu64 " to partition table.", p->partno);
r = fdisk_add_partition(context->fdisk_context, q, NULL);
if (r < 0)
return log_error_errno(r, "Failed to add partition: %m");
assert(!p->new_partition);
p->new_partition = TAKE_PTR(q);
}
}
return 0;
}
static int split_name_printf(Partition *p, char **ret) {
assert(p);
const Specifier table[] = {
{ 't', specifier_string, GPT_PARTITION_TYPE_UUID_TO_STRING_HARDER(p->type.uuid) },
{ 'T', specifier_id128, &p->type.uuid },
{ 'U', specifier_id128, &p->new_uuid },
{ 'n', specifier_uint64, &p->partno },
COMMON_SYSTEM_SPECIFIERS,
{}
};
return specifier_printf(p->split_name_format, NAME_MAX, table, arg_root, p, ret);
}
static int split_node(const char *node, char **ret_base, char **ret_ext) {
_cleanup_free_ char *base = NULL, *ext = NULL;
char *e;
int r;
assert(node);
assert(ret_base);
assert(ret_ext);
r = path_extract_filename(node, &base);
if (r == O_DIRECTORY || r == -EADDRNOTAVAIL)
return log_error_errno(r, "Device node %s cannot be a directory", node);
if (r < 0)
return log_error_errno(r, "Failed to extract filename from %s: %m", node);
e = endswith(base, ".raw");
if (e) {
ext = strdup(e);
if (!ext)
return log_oom();
*e = 0;
}
*ret_base = TAKE_PTR(base);
*ret_ext = TAKE_PTR(ext);
return 0;
}
static int split_name_resolve(Context *context) {
_cleanup_free_ char *parent = NULL, *base = NULL, *ext = NULL;
int r;
assert(context);
r = path_extract_directory(context->node, &parent);
if (r < 0 && r != -EDESTADDRREQ)
return log_error_errno(r, "Failed to extract directory from %s: %m", context->node);
r = split_node(context->node, &base, &ext);
if (r < 0)
return r;
LIST_FOREACH(partitions, p, context->partitions) {
_cleanup_free_ char *resolved = NULL;
if (p->dropped)
continue;
if (!p->split_name_format)
continue;
r = split_name_printf(p, &resolved);
if (r < 0)
return log_error_errno(r, "Failed to resolve specifiers in %s: %m", p->split_name_format);
if (parent)
p->split_path = strjoin(parent, "/", base, ".", resolved, ext);
else
p->split_path = strjoin(base, ".", resolved, ext);
if (!p->split_path)
return log_oom();
}
LIST_FOREACH(partitions, p, context->partitions) {
if (!p->split_path)
continue;
LIST_FOREACH(partitions, q, context->partitions) {
if (p == q)
continue;
if (!q->split_path)
continue;
if (!streq(p->split_path, q->split_path))
continue;
return log_error_errno(SYNTHETIC_ERRNO(ENOTUNIQ),
"%s and %s have the same resolved split name \"%s\", refusing",
p->definition_path, q->definition_path, p->split_path);
}
}
return 0;
}
static int context_split(Context *context) {
int fd = -EBADF, r;
if (!arg_split)
return 0;
assert(context);
/* We can't do resolution earlier because the partition UUIDs for verity partitions are only filled
* in after they've been generated. */
r = split_name_resolve(context);
if (r < 0)
return r;
LIST_FOREACH(partitions, p, context->partitions) {
_cleanup_close_ int fdt = -EBADF;
if (p->dropped)
continue;
if (!p->split_path)
continue;
if (partition_defer(p))
continue;
fdt = open(p->split_path, O_WRONLY|O_NOCTTY|O_CLOEXEC|O_NOFOLLOW|O_CREAT|O_EXCL, 0666);
if (fdt < 0)
return log_error_errno(fdt, "Failed to open split partition file %s: %m", p->split_path);
if (fd < 0)
assert_se((fd = fdisk_get_devfd(context->fdisk_context)) >= 0);
if (lseek(fd, p->offset, SEEK_SET) < 0)
return log_error_errno(errno, "Failed to seek to partition offset: %m");
r = copy_bytes(fd, fdt, p->new_size, COPY_REFLINK|COPY_HOLES);
if (r < 0)
return log_error_errno(r, "Failed to copy to split partition %s: %m", p->split_path);
}
return 0;
}
static int context_write_partition_table(Context *context) {
_cleanup_(fdisk_unref_tablep) struct fdisk_table *original_table = NULL;
int capable, r;
assert(context);
if (!context->from_scratch && !context_changed(context)) {
log_info("No changes.");
return 0;
}
if (arg_dry_run) {
log_notice("Refusing to repartition, please re-run with --dry-run=no.");
return 0;
}
log_info("Applying changes.");
if (context->from_scratch) {
r = context_wipe_range(context, 0, context->total);
if (r < 0)
return r;
log_info("Wiped block device.");
if (arg_discard) {
r = context_discard_range(context, 0, context->total);
if (r == -EOPNOTSUPP)
log_info("Storage does not support discard, not discarding entire block device data.");
else if (r < 0)
return log_error_errno(r, "Failed to discard entire block device: %m");
else if (r > 0)
log_info("Discarded entire block device.");
}
}
r = fdisk_get_partitions(context->fdisk_context, &original_table);
if (r < 0)
return log_error_errno(r, "Failed to acquire partition table: %m");
/* Wipe fs signatures and discard sectors where the new partitions are going to be placed and in the
* gaps between partitions, just to be sure. */
r = context_wipe_and_discard(context);
if (r < 0)
return r;
r = context_copy_blocks(context);
if (r < 0)
return r;
r = context_mkfs(context);
if (r < 0)
return r;
r = context_mangle_partitions(context);
if (r < 0)
return r;
log_info("Writing new partition table.");
r = fdisk_write_disklabel(context->fdisk_context);
if (r < 0)
return log_error_errno(r, "Failed to write partition table: %m");
capable = blockdev_partscan_enabled(fdisk_get_devfd(context->fdisk_context));
if (capable == -ENOTBLK)
log_debug("Not telling kernel to reread partition table, since we are not operating on a block device.");
else if (capable < 0)
return log_error_errno(capable, "Failed to check if block device supports partition scanning: %m");
else if (capable > 0) {
log_info("Telling kernel to reread partition table.");
if (context->from_scratch)
r = fdisk_reread_partition_table(context->fdisk_context);
else
r = fdisk_reread_changes(context->fdisk_context, original_table);
if (r < 0)
return log_error_errno(r, "Failed to reread partition table: %m");
} else
log_notice("Not telling kernel to reread partition table, because selected image does not support kernel partition block devices.");
log_info("All done.");
return 0;
}
static int context_read_seed(Context *context, const char *root) {
int r;
assert(context);
if (!sd_id128_is_null(context->seed))
return 0;
if (!arg_randomize) {
_cleanup_close_ int fd = -EBADF;
fd = chase_symlinks_and_open("/etc/machine-id", root, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC, NULL);
if (fd == -ENOENT)
log_info("No machine ID set, using randomized partition UUIDs.");
else if (fd < 0)
return log_error_errno(fd, "Failed to determine machine ID of image: %m");
else {
r = id128_read_fd(fd, ID128_FORMAT_PLAIN, &context->seed);
if (r < 0) {
if (!ERRNO_IS_MACHINE_ID_UNSET(r))
return log_error_errno(r, "Failed to parse machine ID of image: %m");
log_info("No machine ID set, using randomized partition UUIDs.");
}
return 0;
}
}
r = sd_id128_randomize(&context->seed);
if (r < 0)
return log_error_errno(r, "Failed to generate randomized seed: %m");
return 0;
}
static int context_factory_reset(Context *context) {
size_t n = 0;
int r;
assert(context);
if (arg_factory_reset <= 0)
return 0;
if (context->from_scratch) /* Nothing to reset if we start from scratch */
return 0;
if (arg_dry_run) {
log_notice("Refusing to factory reset, please re-run with --dry-run=no.");
return 0;
}
log_info("Applying factory reset.");
LIST_FOREACH(partitions, p, context->partitions) {
if (!p->factory_reset || !PARTITION_EXISTS(p))
continue;
assert(p->partno != UINT64_MAX);
log_info("Removing partition %" PRIu64 " for factory reset.", p->partno);
r = fdisk_delete_partition(context->fdisk_context, p->partno);
if (r < 0)
return log_error_errno(r, "Failed to remove partition %" PRIu64 ": %m", p->partno);
n++;
}
if (n == 0) {
log_info("Factory reset requested, but no partitions to delete found.");
return 0;
}
r = fdisk_write_disklabel(context->fdisk_context);
if (r < 0)
return log_error_errno(r, "Failed to write disk label: %m");
log_info("Successfully deleted %zu partitions.", n);
return 1;
}
static int context_can_factory_reset(Context *context) {
assert(context);
LIST_FOREACH(partitions, p, context->partitions)
if (p->factory_reset && PARTITION_EXISTS(p))
return true;
return false;
}
static int resolve_copy_blocks_auto_candidate(
dev_t partition_devno,
GptPartitionType partition_type,
dev_t restrict_devno,
sd_id128_t *ret_uuid) {
_cleanup_(blkid_free_probep) blkid_probe b = NULL;
_cleanup_close_ int fd = -EBADF;
_cleanup_free_ char *p = NULL;
const char *pttype, *t;
sd_id128_t pt_parsed, u;
blkid_partition pp;
dev_t whole_devno;
blkid_partlist pl;
int r;
/* Checks if the specified partition has the specified GPT type UUID, and is located on the specified
* 'restrict_devno' device. The type check is particularly relevant if we have Verity volume which is
* backed by two separate partitions: the data and the hash partitions, and we need to find the right
* one of the two. */
r = block_get_whole_disk(partition_devno, &whole_devno);
if (r < 0)
return log_error_errno(
r,
"Unable to determine containing block device of partition %u:%u: %m",
major(partition_devno), minor(partition_devno));
if (restrict_devno != (dev_t) -1 &&
restrict_devno != whole_devno)
return log_error_errno(
SYNTHETIC_ERRNO(EPERM),
"Partition %u:%u is located outside of block device %u:%u, refusing.",
major(partition_devno), minor(partition_devno),
major(restrict_devno), minor(restrict_devno));
fd = r = device_open_from_devnum(S_IFBLK, whole_devno, O_RDONLY|O_CLOEXEC|O_NONBLOCK, &p);
if (r < 0)
return log_error_errno(r, "Failed to open block device " DEVNUM_FORMAT_STR ": %m",
DEVNUM_FORMAT_VAL(whole_devno));
b = blkid_new_probe();
if (!b)
return log_oom();
errno = 0;
r = blkid_probe_set_device(b, fd, 0, 0);
if (r != 0)
return log_error_errno(errno_or_else(ENOMEM), "Failed to open block device '%s': %m", p);
(void) blkid_probe_enable_partitions(b, 1);
(void) blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
errno = 0;
r = blkid_do_safeprobe(b);
if (r == _BLKID_SAFEPROBE_ERROR)
return log_error_errno(errno_or_else(EIO), "Unable to probe for partition table of '%s': %m", p);
if (IN_SET(r, _BLKID_SAFEPROBE_AMBIGUOUS, _BLKID_SAFEPROBE_NOT_FOUND)) {
log_debug("Didn't find partition table on block device '%s'.", p);
return false;
}
assert(r == _BLKID_SAFEPROBE_FOUND);
(void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
if (!streq_ptr(pttype, "gpt")) {
log_debug("Didn't find a GPT partition table on '%s'.", p);
return false;
}
errno = 0;
pl = blkid_probe_get_partitions(b);
if (!pl)
return log_error_errno(errno_or_else(EIO), "Unable read partition table of '%s': %m", p);
pp = blkid_partlist_devno_to_partition(pl, partition_devno);
if (!pp) {
log_debug("Partition %u:%u has no matching partition table entry on '%s'.",
major(partition_devno), minor(partition_devno), p);
return false;
}
t = blkid_partition_get_type_string(pp);
if (isempty(t)) {
log_debug("Partition %u:%u has no type on '%s'.",
major(partition_devno), minor(partition_devno), p);
return false;
}
r = sd_id128_from_string(t, &pt_parsed);
if (r < 0) {
log_debug_errno(r, "Failed to parse partition type \"%s\": %m", t);
return false;
}
if (!sd_id128_equal(pt_parsed, partition_type.uuid)) {
log_debug("Partition %u:%u has non-matching partition type " SD_ID128_FORMAT_STR " (needed: " SD_ID128_FORMAT_STR "), ignoring.",
major(partition_devno), minor(partition_devno),
SD_ID128_FORMAT_VAL(pt_parsed), SD_ID128_FORMAT_VAL(partition_type.uuid));
return false;
}
r = blkid_partition_get_uuid_id128(pp, &u);
if (r == -ENXIO) {
log_debug_errno(r, "Partition " DEVNUM_FORMAT_STR " has no UUID.", DEVNUM_FORMAT_VAL(partition_devno));
return false;
}
if (r < 0) {
log_debug_errno(r, "Failed to read partition UUID of " DEVNUM_FORMAT_STR ": %m", DEVNUM_FORMAT_VAL(partition_devno));
return false;
}
log_debug("Automatically found partition " DEVNUM_FORMAT_STR " of right type " SD_ID128_FORMAT_STR ".",
DEVNUM_FORMAT_VAL(partition_devno),
SD_ID128_FORMAT_VAL(pt_parsed));
if (ret_uuid)
*ret_uuid = u;
return true;
}
static int find_backing_devno(
const char *path,
const char *root,
dev_t *ret) {
_cleanup_free_ char *resolved = NULL;
int r;
assert(path);
r = chase_symlinks(path, root, CHASE_PREFIX_ROOT, &resolved, NULL);
if (r < 0)
return r;
r = path_is_mount_point(resolved, NULL, 0);
if (r < 0)
return r;
if (r == 0) /* Not a mount point, then it's not a partition of its own, let's not automatically use it. */
return -ENOENT;
r = get_block_device(resolved, ret);
if (r < 0)
return r;
if (r == 0) /* Not backed by physical file system, we can't use this */
return -ENOENT;
return 0;
}
static int resolve_copy_blocks_auto(
GptPartitionType type,
const char *root,
dev_t restrict_devno,
dev_t *ret_devno,
sd_id128_t *ret_uuid) {
const char *try1 = NULL, *try2 = NULL;
char p[SYS_BLOCK_PATH_MAX("/slaves")];
_cleanup_(closedirp) DIR *d = NULL;
sd_id128_t found_uuid = SD_ID128_NULL;
dev_t devno, found = 0;
int r;
/* Enforce some security restrictions: CopyBlocks=auto should not be an avenue to get outside of the
* --root=/--image= confinement. Specifically, refuse CopyBlocks= in combination with --root= at all,
* and restrict block device references in the --image= case to loopback block device we set up.
*
* restrict_devno contain the dev_t of the loop back device we operate on in case of --image=, and
* thus declares which device (and its partition subdevices) we shall limit access to. If
* restrict_devno is zero no device probing access shall be allowed at all (used for --root=) and if
* it is (dev_t) -1 then free access shall be allowed (if neither switch is used). */
if (restrict_devno == 0)
return log_error_errno(SYNTHETIC_ERRNO(EPERM),
"Automatic discovery of backing block devices not permitted in --root= mode, refusing.");
/* Handles CopyBlocks=auto, and finds the right source partition to copy from. We look for matching
* partitions in the host, using the appropriate directory as key and ensuring that the partition
* type matches. */
if (type.designator == PARTITION_ROOT)
try1 = "/";
else if (type.designator == PARTITION_USR)
try1 = "/usr/";
else if (type.designator == PARTITION_ROOT_VERITY)
try1 = "/";
else if (type.designator == PARTITION_USR_VERITY)
try1 = "/usr/";
else if (type.designator == PARTITION_ESP) {
try1 = "/efi/";
try2 = "/boot/";
} else if (type.designator == PARTITION_XBOOTLDR)
try1 = "/boot/";
else
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"Partition type " SD_ID128_FORMAT_STR " not supported from automatic source block device discovery.",
SD_ID128_FORMAT_VAL(type.uuid));
r = find_backing_devno(try1, root, &devno);
if (r == -ENOENT && try2)
r = find_backing_devno(try2, root, &devno);
if (r < 0)
return log_error_errno(r, "Failed to resolve automatic CopyBlocks= path for partition type " SD_ID128_FORMAT_STR ", sorry: %m",
SD_ID128_FORMAT_VAL(type.uuid));
xsprintf_sys_block_path(p, "/slaves", devno);
d = opendir(p);
if (d) {
struct dirent *de;
for (;;) {
_cleanup_free_ char *q = NULL, *t = NULL;
sd_id128_t u;
dev_t sl;
errno = 0;
de = readdir_no_dot(d);
if (!de) {
if (errno != 0)
return log_error_errno(errno, "Failed to read directory '%s': %m", p);
break;
}
if (!IN_SET(de->d_type, DT_LNK, DT_UNKNOWN))
continue;
q = path_join(p, de->d_name, "/dev");
if (!q)
return log_oom();
r = read_one_line_file(q, &t);
if (r < 0)
return log_error_errno(r, "Failed to read %s: %m", q);
r = parse_devnum(t, &sl);
if (r < 0) {
log_debug_errno(r, "Failed to parse %s, ignoring: %m", q);
continue;
}
if (major(sl) == 0) {
log_debug("Device backing %s is special, ignoring.", q);
continue;
}
r = resolve_copy_blocks_auto_candidate(sl, type, restrict_devno, &u);
if (r < 0)
return r;
if (r > 0) {
/* We found a matching one! */
if (found != 0)
return log_error_errno(SYNTHETIC_ERRNO(ENOTUNIQ),
"Multiple matching partitions found, refusing.");
found = sl;
found_uuid = u;
}
}
} else if (errno != ENOENT)
return log_error_errno(errno, "Failed open %s: %m", p);
else {
r = resolve_copy_blocks_auto_candidate(devno, type, restrict_devno, &found_uuid);
if (r < 0)
return r;
if (r > 0)
found = devno;
}
if (found == 0)
return log_error_errno(SYNTHETIC_ERRNO(ENXIO),
"Unable to automatically discover suitable partition to copy blocks from.");
if (ret_devno)
*ret_devno = found;
if (ret_uuid)
*ret_uuid = found_uuid;
return 0;
}
static int context_open_copy_block_paths(
Context *context,
dev_t restrict_devno) {
int r;
assert(context);
LIST_FOREACH(partitions, p, context->partitions) {
_cleanup_close_ int source_fd = -EBADF;
_cleanup_free_ char *opened = NULL;
sd_id128_t uuid = SD_ID128_NULL;
uint64_t size;
struct stat st;
assert(p->copy_blocks_fd < 0);
assert(p->copy_blocks_size == UINT64_MAX);
if (PARTITION_EXISTS(p)) /* Never copy over partitions that already exist! */
continue;
if (p->copy_blocks_path) {
source_fd = chase_symlinks_and_open(p->copy_blocks_path, p->copy_blocks_root, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC|O_NONBLOCK, &opened);
if (source_fd < 0)
return log_error_errno(source_fd, "Failed to open '%s': %m", p->copy_blocks_path);
if (fstat(source_fd, &st) < 0)
return log_error_errno(errno, "Failed to stat block copy file '%s': %m", opened);
if (!S_ISREG(st.st_mode) && restrict_devno != (dev_t) -1)
return log_error_errno(SYNTHETIC_ERRNO(EPERM),
"Copying from block device node is not permitted in --image=/--root= mode, refusing.");
} else if (p->copy_blocks_auto) {
dev_t devno = 0; /* Fake initialization to appease gcc. */
r = resolve_copy_blocks_auto(p->type, p->copy_blocks_root, restrict_devno, &devno, &uuid);
if (r < 0)
return r;
assert(devno != 0);
source_fd = r = device_open_from_devnum(S_IFBLK, devno, O_RDONLY|O_CLOEXEC|O_NONBLOCK, &opened);
if (r < 0)
return log_error_errno(r, "Failed to open automatically determined source block copy device " DEVNUM_FORMAT_STR ": %m",
DEVNUM_FORMAT_VAL(devno));
if (fstat(source_fd, &st) < 0)
return log_error_errno(errno, "Failed to stat block copy file '%s': %m", opened);
} else
continue;
if (S_ISDIR(st.st_mode)) {
_cleanup_free_ char *bdev = NULL;
dev_t devt;
/* If the file is a directory, automatically find the backing block device */
if (major(st.st_dev) != 0)
devt = st.st_dev;
else {
/* Special support for btrfs */
r = btrfs_get_block_device_fd(source_fd, &devt);
if (r == -EUCLEAN)
return btrfs_log_dev_root(LOG_ERR, r, opened);
if (r < 0)
return log_error_errno(r, "Unable to determine backing block device of '%s': %m", opened);
}
safe_close(source_fd);
source_fd = r = device_open_from_devnum(S_IFBLK, devt, O_RDONLY|O_CLOEXEC|O_NONBLOCK, &bdev);
if (r < 0)
return log_error_errno(r, "Failed to open block device backing '%s': %m", opened);
if (fstat(source_fd, &st) < 0)
return log_error_errno(errno, "Failed to stat block device '%s': %m", bdev);
}
if (S_ISREG(st.st_mode))
size = st.st_size;
else if (S_ISBLK(st.st_mode)) {
if (ioctl(source_fd, BLKGETSIZE64, &size) != 0)
return log_error_errno(errno, "Failed to determine size of block device to copy from: %m");
} else
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Specified path to copy blocks from '%s' is not a regular file, block device or directory, refusing: %m", opened);
if (size <= 0)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "File to copy bytes from '%s' has zero size, refusing.", opened);
if (size % 512 != 0)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "File to copy bytes from '%s' has size that is not multiple of 512, refusing.", opened);
p->copy_blocks_fd = TAKE_FD(source_fd);
p->copy_blocks_size = size;
free_and_replace(p->copy_blocks_path, opened);
/* When copying from an existing partition copy that partitions UUID if none is configured explicitly */
if (!p->new_uuid_is_set && !sd_id128_is_null(uuid)) {
p->new_uuid = uuid;
p->new_uuid_is_set = true;
}
}
return 0;
}
static int fd_apparent_size(int fd, uint64_t *ret) {
off_t initial = 0;
uint64_t size = 0;
assert(fd >= 0);
assert(ret);
initial = lseek(fd, 0, SEEK_CUR);
if (initial < 0)
return log_error_errno(errno, "Failed to get file offset: %m");
for (off_t off = 0;;) {
off_t r;
r = lseek(fd, off, SEEK_DATA);
if (r < 0 && errno == ENXIO)
/* If errno == ENXIO, that means we've reached the final hole of the file and
* that hole isn't followed by more data. */
break;
if (r < 0)
return log_error_errno(errno, "Failed to seek data in file from offset %"PRIi64": %m", off);
off = r; /* Set the offset to the start of the data segment. */
/* After copying a potential hole, find the end of the data segment by looking for
* the next hole. If we get ENXIO, we're at EOF. */
r = lseek(fd, off, SEEK_HOLE);
if (r < 0) {
if (errno == ENXIO)
break;
return log_error_errno(errno, "Failed to seek hole in file from offset %"PRIi64": %m", off);
}
size += r - off;
off = r;
}
if (lseek(fd, initial, SEEK_SET) < 0)
return log_error_errno(errno, "Failed to reset file offset: %m");
*ret = size;
return 0;
}
static int context_minimize(Context *context) {
_cleanup_set_free_ Set *denylist = NULL;
const char *vt;
int r;
assert(context);
r = make_copy_files_denylist(context, &denylist);
if (r < 0)
return r;
r = var_tmp_dir(&vt);
if (r < 0)
return log_error_errno(r, "Could not determine temporary directory: %m");
LIST_FOREACH(partitions, p, context->partitions) {
_cleanup_(rm_rf_physical_and_freep) char *root = NULL;
_cleanup_(unlink_and_freep) char *temp = NULL;
_cleanup_(loop_device_unrefp) LoopDevice *d = NULL;
_cleanup_close_ int fd = -EBADF;
sd_id128_t fs_uuid;
uint64_t fsz;
if (p->dropped)
continue;
if (PARTITION_EXISTS(p)) /* Never format existing partitions */
continue;
if (!p->format)
continue;
if (p->minimize == MINIMIZE_OFF)
continue;
if (!partition_needs_populate(p))
continue;
assert(!p->copy_blocks_path);
r = tempfn_random_child(vt, "repart", &temp);
if (r < 0)
return log_error_errno(r, "Failed to generate temporary file path: %m");
if (fstype_is_ro(p->format))
fs_uuid = p->fs_uuid;
else {
fd = open(temp, O_CREAT|O_EXCL|O_CLOEXEC|O_RDWR|O_NOCTTY, 0600);
if (fd < 0)
return log_error_errno(errno, "Failed to open temporary file %s: %m", temp);
/* This may seem huge but it will be created sparse so it doesn't take up any space
* on disk until written to. */
if (ftruncate(fd, 1024ULL * 1024ULL * 1024ULL * 1024ULL) < 0)
return log_error_errno(errno, "Failed to truncate temporary file to %s: %m",
FORMAT_BYTES(1024ULL * 1024ULL * 1024ULL * 1024ULL));
r = loop_device_make(fd, O_RDWR, 0, UINT64_MAX, 0, 0, LOCK_EX, &d);
if (r < 0 && r != -ENOENT && !ERRNO_IS_PRIVILEGE(r))
return log_error_errno(r, "Failed to make loopback device of %s: %m", temp);
/* We're going to populate this filesystem twice so use a random UUID the first time
* to avoid UUID conflicts. */
r = sd_id128_randomize(&fs_uuid);
if (r < 0)
return r;
}
if (!d || fstype_is_ro(p->format)) {
if (!mkfs_supports_root_option(p->format))
return log_error_errno(SYNTHETIC_ERRNO(ENODEV),
"Loop device access is required to populate %s filesystems",
p->format);
r = partition_populate_directory(p, denylist, &root);
if (r < 0)
return r;
}
r = make_filesystem(d ? d->node : temp, p->format, strempty(p->new_label), root, fs_uuid,
arg_discard, context->sector_size, NULL);
if (r < 0)
return r;
/* Read-only filesystems are minimal from the first try because they create and size the
* loopback file for us. */
if (fstype_is_ro(p->format)) {
p->copy_blocks_path = TAKE_PTR(temp);
p->copy_blocks_path_is_our_file = true;
continue;
}
if (!root) {
assert(d);
r = partition_populate_filesystem(p, d->node, denylist);
if (r < 0)
return r;
}
/* Other filesystems need to be provided with a pre-sized loopback file and will adapt to
* fully occupy it. Because we gave the filesystem a 1T sparse file, we need to shrink the
* filesystem down to a reasonable size again to fit it in the disk image. While there are
* some filesystems that support shrinking, it doesn't always work properly (e.g. shrinking
* btrfs gives us a 2.0G filesystem regardless of what we put in it). Instead, let's populate
* the filesystem again, but this time, instead of providing the filesystem with a 1T sparse
* loopback file, let's size the loopback file based on the actual data used by the
* filesystem in the sparse file after the first attempt. This should be a good guess of the
* minimal amount of space needed in the filesystem to fit all the required data.
*/
r = fd_apparent_size(fd, &fsz);
if (r < 0)
return r;
/* Massage the size a bit because just going by actual data used in the sparse file isn't
* fool-proof. */
fsz = round_up_size(fsz + (fsz / 2), context->grain_size);
if (minimal_size_by_fs_name(p->format) != UINT64_MAX)
fsz = MAX(minimal_size_by_fs_name(p->format), fsz);
d = loop_device_unref(d);
/* Erase the previous filesystem first. */
if (ftruncate(fd, 0))
return log_error_errno(errno, "Failed to erase temporary file: %m");
if (ftruncate(fd, fsz))
return log_error_errno(errno, "Failed to truncate temporary file to %s: %m", FORMAT_BYTES(fsz));
r = loop_device_make(fd, O_RDWR, 0, UINT64_MAX, 0, 0, LOCK_EX, &d);
if (r < 0 && r != -ENOENT && !ERRNO_IS_PRIVILEGE(r))
return log_error_errno(r, "Failed to make loopback device of %s: %m", temp);
r = make_filesystem(d ? d->node : temp, p->format, strempty(p->new_label), root, p->fs_uuid,
arg_discard, context->sector_size, NULL);
if (r < 0)
return r;
if (!root) {
assert(d);
r = partition_populate_filesystem(p, d->node, denylist);
if (r < 0)
return r;
}
p->copy_blocks_path = TAKE_PTR(temp);
p->copy_blocks_path_is_our_file = true;
}
return 0;
}
static int parse_partition_types(const char *p, sd_id128_t **partitions, size_t *n_partitions) {
int r;
assert(partitions);
assert(n_partitions);
for (;;) {
_cleanup_free_ char *name = NULL;
GptPartitionType type;
r = extract_first_word(&p, &name, ",", EXTRACT_CUNESCAPE|EXTRACT_DONT_COALESCE_SEPARATORS);
if (r == 0)
break;
if (r < 0)
return log_error_errno(r, "Failed to extract partition type identifier or GUID: %s", p);
r = gpt_partition_type_from_string(name, &type);
if (r < 0)
return log_error_errno(r, "'%s' is not a valid partition type identifier or GUID", name);
if (!GREEDY_REALLOC(*partitions, *n_partitions + 1))
return log_oom();
(*partitions)[(*n_partitions)++] = type.uuid;
}
return 0;
}
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-repart", "8", &link);
if (r < 0)
return log_oom();
printf("%s [OPTIONS...] [DEVICE]\n"
"\n%sGrow and add partitions to partition table.%s\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --no-pager Do not pipe output into a pager\n"
" --no-legend Do not show the headers and footers\n"
" --dry-run=BOOL Whether to run dry-run operation\n"
" --empty=MODE One of refuse, allow, require, force, create; controls\n"
" how to handle empty disks lacking partition tables\n"
" --discard=BOOL Whether to discard backing blocks for new partitions\n"
" --pretty=BOOL Whether to show pretty summary before doing changes\n"
" --factory-reset=BOOL Whether to remove data partitions before recreating\n"
" them\n"
" --can-factory-reset Test whether factory reset is defined\n"
" --root=PATH Operate relative to root path\n"
" --image=PATH Operate relative to image file\n"
" --definitions=DIR Find partition definitions in specified directory\n"
" --key-file=PATH Key to use when encrypting partitions\n"
" --private-key=PATH Private key to use when generating verity roothash\n"
" signatures\n"
" --certificate=PATH PEM certificate to use when generating verity\n"
" roothash signatures\n"
" --tpm2-device=PATH Path to TPM2 device node to use\n"
" --tpm2-pcrs=PCR1+PCR2+PCR3+…\n"
" TPM2 PCR indexes to use for TPM2 enrollment\n"
" --tpm2-public-key=PATH\n"
" Enroll signed TPM2 PCR policy against PEM public key\n"
" --tpm2-public-key-pcrs=PCR1+PCR2+PCR3+…\n"
" Enroll signed TPM2 PCR policy for specified TPM2 PCRs\n"
" --seed=UUID 128bit seed UUID to derive all UUIDs from\n"
" --size=BYTES Grow loopback file to specified size\n"
" --json=pretty|short|off\n"
" Generate JSON output\n"
" --split=BOOL Whether to generate split artifacts\n"
" --include-partitions=PARTITION1,PARTITION2,PARTITION3,…\n"
" Ignore partitions not of the specified types\n"
" --exclude-partitions=PARTITION1,PARTITION2,PARTITION3,…\n"
" Ignore partitions of the specified types\n"
" --defer-partitions=PARTITION1,PARTITION2,PARTITION3,…\n"
" Take partitions of the specified types into account\n"
" but don't populate them yet\n"
" --sector-size=SIZE Set the logical sector size for the image\n"
"\nSee the %s for details.\n",
program_invocation_short_name,
ansi_highlight(),
ansi_normal(),
link);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_NO_PAGER,
ARG_NO_LEGEND,
ARG_DRY_RUN,
ARG_EMPTY,
ARG_DISCARD,
ARG_FACTORY_RESET,
ARG_CAN_FACTORY_RESET,
ARG_ROOT,
ARG_IMAGE,
ARG_SEED,
ARG_PRETTY,
ARG_DEFINITIONS,
ARG_SIZE,
ARG_JSON,
ARG_KEY_FILE,
ARG_PRIVATE_KEY,
ARG_CERTIFICATE,
ARG_TPM2_DEVICE,
ARG_TPM2_PCRS,
ARG_TPM2_PUBLIC_KEY,
ARG_TPM2_PUBLIC_KEY_PCRS,
ARG_SPLIT,
ARG_INCLUDE_PARTITIONS,
ARG_EXCLUDE_PARTITIONS,
ARG_DEFER_PARTITIONS,
ARG_SECTOR_SIZE,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
{ "no-legend", no_argument, NULL, ARG_NO_LEGEND },
{ "dry-run", required_argument, NULL, ARG_DRY_RUN },
{ "empty", required_argument, NULL, ARG_EMPTY },
{ "discard", required_argument, NULL, ARG_DISCARD },
{ "factory-reset", required_argument, NULL, ARG_FACTORY_RESET },
{ "can-factory-reset", no_argument, NULL, ARG_CAN_FACTORY_RESET },
{ "root", required_argument, NULL, ARG_ROOT },
{ "image", required_argument, NULL, ARG_IMAGE },
{ "seed", required_argument, NULL, ARG_SEED },
{ "pretty", required_argument, NULL, ARG_PRETTY },
{ "definitions", required_argument, NULL, ARG_DEFINITIONS },
{ "size", required_argument, NULL, ARG_SIZE },
{ "json", required_argument, NULL, ARG_JSON },
{ "key-file", required_argument, NULL, ARG_KEY_FILE },
{ "private-key", required_argument, NULL, ARG_PRIVATE_KEY },
{ "certificate", required_argument, NULL, ARG_CERTIFICATE },
{ "tpm2-device", required_argument, NULL, ARG_TPM2_DEVICE },
{ "tpm2-pcrs", required_argument, NULL, ARG_TPM2_PCRS },
{ "tpm2-public-key", required_argument, NULL, ARG_TPM2_PUBLIC_KEY },
{ "tpm2-public-key-pcrs", required_argument, NULL, ARG_TPM2_PUBLIC_KEY_PCRS },
{ "split", required_argument, NULL, ARG_SPLIT },
{ "include-partitions", required_argument, NULL, ARG_INCLUDE_PARTITIONS },
{ "exclude-partitions", required_argument, NULL, ARG_EXCLUDE_PARTITIONS },
{ "defer-partitions", required_argument, NULL, ARG_DEFER_PARTITIONS },
{ "sector-size", required_argument, NULL, ARG_SECTOR_SIZE },
{}
};
int c, r, dry_run = -1;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case ARG_NO_PAGER:
arg_pager_flags |= PAGER_DISABLE;
break;
case ARG_NO_LEGEND:
arg_legend = false;
break;
case ARG_DRY_RUN:
r = parse_boolean_argument("--dry-run=", optarg, &arg_dry_run);
if (r < 0)
return r;
break;
case ARG_EMPTY:
if (isempty(optarg) || streq(optarg, "refuse"))
arg_empty = EMPTY_REFUSE;
else if (streq(optarg, "allow"))
arg_empty = EMPTY_ALLOW;
else if (streq(optarg, "require"))
arg_empty = EMPTY_REQUIRE;
else if (streq(optarg, "force"))
arg_empty = EMPTY_FORCE;
else if (streq(optarg, "create")) {
arg_empty = EMPTY_CREATE;
if (dry_run < 0)
dry_run = false; /* Imply --dry-run=no if we create the loopback file
* anew. After all we cannot really break anyone's
* partition tables that way. */
} else
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Failed to parse --empty= parameter: %s", optarg);
break;
case ARG_DISCARD:
r = parse_boolean_argument("--discard=", optarg, &arg_discard);
if (r < 0)
return r;
break;
case ARG_FACTORY_RESET:
r = parse_boolean_argument("--factory-reset=", optarg, NULL);
if (r < 0)
return r;
arg_factory_reset = r;
break;
case ARG_CAN_FACTORY_RESET:
arg_can_factory_reset = true;
break;
case ARG_ROOT:
r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_root);
if (r < 0)
return r;
break;
case ARG_IMAGE:
r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_image);
if (r < 0)
return r;
break;
case ARG_SEED:
if (isempty(optarg)) {
arg_seed = SD_ID128_NULL;
arg_randomize = false;
} else if (streq(optarg, "random"))
arg_randomize = true;
else {
r = sd_id128_from_string(optarg, &arg_seed);
if (r < 0)
return log_error_errno(r, "Failed to parse seed: %s", optarg);
arg_randomize = false;
}
break;
case ARG_PRETTY:
r = parse_boolean_argument("--pretty=", optarg, NULL);
if (r < 0)
return r;
arg_pretty = r;
break;
case ARG_DEFINITIONS: {
_cleanup_free_ char *path = NULL;
r = parse_path_argument(optarg, false, &path);
if (r < 0)
return r;
if (strv_consume(&arg_definitions, TAKE_PTR(path)) < 0)
return log_oom();
break;
}
case ARG_SIZE: {
uint64_t parsed, rounded;
if (streq(optarg, "auto")) {
arg_size = UINT64_MAX;
arg_size_auto = true;
break;
}
r = parse_size(optarg, 1024, &parsed);
if (r < 0)
return log_error_errno(r, "Failed to parse --size= parameter: %s", optarg);
rounded = round_up_size(parsed, 4096);
if (rounded == 0)
return log_error_errno(SYNTHETIC_ERRNO(ERANGE), "Specified image size too small, refusing.");
if (rounded == UINT64_MAX)
return log_error_errno(SYNTHETIC_ERRNO(ERANGE), "Specified image size too large, refusing.");
if (rounded != parsed)
log_warning("Specified size is not a multiple of 4096, rounding up automatically. (%" PRIu64 " %s %" PRIu64 ")",
parsed, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), rounded);
arg_size = rounded;
arg_size_auto = false;
break;
}
case ARG_JSON:
r = parse_json_argument(optarg, &arg_json_format_flags);
if (r <= 0)
return r;
break;
case ARG_KEY_FILE: {
_cleanup_(erase_and_freep) char *k = NULL;
size_t n = 0;
r = read_full_file_full(
AT_FDCWD, optarg, UINT64_MAX, SIZE_MAX,
READ_FULL_FILE_SECURE|READ_FULL_FILE_WARN_WORLD_READABLE|READ_FULL_FILE_CONNECT_SOCKET,
NULL,
&k, &n);
if (r < 0)
return log_error_errno(r, "Failed to read key file '%s': %m", optarg);
erase_and_free(arg_key);
arg_key = TAKE_PTR(k);
arg_key_size = n;
break;
}
case ARG_PRIVATE_KEY: {
_cleanup_(erase_and_freep) char *k = NULL;
size_t n = 0;
r = read_full_file_full(
AT_FDCWD, optarg, UINT64_MAX, SIZE_MAX,
READ_FULL_FILE_SECURE|READ_FULL_FILE_WARN_WORLD_READABLE|READ_FULL_FILE_CONNECT_SOCKET,
NULL,
&k, &n);
if (r < 0)
return log_error_errno(r, "Failed to read key file '%s': %m", optarg);
EVP_PKEY_free(arg_private_key);
arg_private_key = NULL;
r = parse_private_key(k, n, &arg_private_key);
if (r < 0)
return r;
break;
}
case ARG_CERTIFICATE: {
_cleanup_free_ char *cert = NULL;
size_t n = 0;
r = read_full_file_full(
AT_FDCWD, optarg, UINT64_MAX, SIZE_MAX,
READ_FULL_FILE_CONNECT_SOCKET,
NULL,
&cert, &n);
if (r < 0)
return log_error_errno(r, "Failed to read certificate file '%s': %m", optarg);
X509_free(arg_certificate);
arg_certificate = NULL;
r = parse_x509_certificate(cert, n, &arg_certificate);
if (r < 0)
return r;
break;
}
case ARG_TPM2_DEVICE: {
_cleanup_free_ char *device = NULL;
if (streq(optarg, "list"))
return tpm2_list_devices();
if (!streq(optarg, "auto")) {
device = strdup(optarg);
if (!device)
return log_oom();
}
free(arg_tpm2_device);
arg_tpm2_device = TAKE_PTR(device);
break;
}
case ARG_TPM2_PCRS:
r = tpm2_parse_pcr_argument(optarg, &arg_tpm2_pcr_mask);
if (r < 0)
return r;
break;
case ARG_TPM2_PUBLIC_KEY:
r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_tpm2_public_key);
if (r < 0)
return r;
break;
case ARG_TPM2_PUBLIC_KEY_PCRS:
r = tpm2_parse_pcr_argument(optarg, &arg_tpm2_public_key_pcr_mask);
if (r < 0)
return r;
break;
case ARG_SPLIT:
r = parse_boolean_argument("--split=", optarg, NULL);
if (r < 0)
return r;
arg_split = r;
break;
case ARG_INCLUDE_PARTITIONS:
if (arg_filter_partitions_type == FILTER_PARTITIONS_EXCLUDE)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Combination of --include-partitions= and --exclude-partitions= is invalid.");
r = parse_partition_types(optarg, &arg_filter_partitions, &arg_n_filter_partitions);
if (r < 0)
return r;
arg_filter_partitions_type = FILTER_PARTITIONS_INCLUDE;
break;
case ARG_EXCLUDE_PARTITIONS:
if (arg_filter_partitions_type == FILTER_PARTITIONS_INCLUDE)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Combination of --include-partitions= and --exclude-partitions= is invalid.");
r = parse_partition_types(optarg, &arg_filter_partitions, &arg_n_filter_partitions);
if (r < 0)
return r;
arg_filter_partitions_type = FILTER_PARTITIONS_EXCLUDE;
break;
case ARG_DEFER_PARTITIONS:
r = parse_partition_types(optarg, &arg_defer_partitions, &arg_n_defer_partitions);
if (r < 0)
return r;
break;
case ARG_SECTOR_SIZE:
r = parse_sector_size(optarg, &arg_sector_size);
if (r < 0)
return r;
break;
case '?':
return -EINVAL;
default:
assert_not_reached();
}
if (argc - optind > 1)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Expected at most one argument, the path to the block device.");
if (arg_factory_reset > 0 && IN_SET(arg_empty, EMPTY_FORCE, EMPTY_REQUIRE, EMPTY_CREATE))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Combination of --factory-reset=yes and --empty=force/--empty=require/--empty=create is invalid.");
if (arg_can_factory_reset)
arg_dry_run = true; /* When --can-factory-reset is specified we don't make changes, hence
* non-dry-run mode makes no sense. Thus, imply dry run mode so that we
* open things strictly read-only. */
else if (dry_run >= 0)
arg_dry_run = dry_run;
if (arg_empty == EMPTY_CREATE && (arg_size == UINT64_MAX && !arg_size_auto))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"If --empty=create is specified, --size= must be specified, too.");
if (arg_image && arg_root)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Please specify either --root= or --image=, the combination of both is not supported.");
else if (!arg_image && !arg_root && in_initrd()) {
/* By default operate on /sysusr/ or /sysroot/ when invoked in the initrd. We prefer the
* former, if it is mounted, so that we have deterministic behaviour on systems where /usr/
* is vendor-supplied but the root fs formatted on first boot. */
r = path_is_mount_point("/sysusr/usr", NULL, 0);
if (r <= 0) {
if (r < 0 && r != -ENOENT)
log_debug_errno(r, "Unable to determine whether /sysusr/usr is a mount point, assuming it is not: %m");
arg_root = strdup("/sysroot");
} else
arg_root = strdup("/sysusr");
if (!arg_root)
return log_oom();
}
arg_node = argc > optind ? argv[optind] : NULL;
if (IN_SET(arg_empty, EMPTY_FORCE, EMPTY_REQUIRE, EMPTY_CREATE) && !arg_node && !arg_image)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"A path to a device node or loopback file must be specified when --empty=force, --empty=require or --empty=create are used.");
if (arg_split && !arg_node)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"A path to a loopback file must be specified when --split is used.");
if (arg_tpm2_pcr_mask == UINT32_MAX)
arg_tpm2_pcr_mask = TPM2_PCR_MASK_DEFAULT;
if (arg_tpm2_public_key_pcr_mask == UINT32_MAX)
arg_tpm2_public_key_pcr_mask = UINT32_C(1) << TPM_PCR_INDEX_KERNEL_IMAGE;
if (arg_pretty < 0 && isatty(STDOUT_FILENO))
arg_pretty = true;
return 1;
}
static int parse_proc_cmdline_factory_reset(void) {
bool b;
int r;
if (arg_factory_reset >= 0) /* Never override what is specified on the process command line */
return 0;
if (!in_initrd()) /* Never honour kernel command line factory reset request outside of the initrd */
return 0;
r = proc_cmdline_get_bool("systemd.factory_reset", &b);
if (r < 0)
return log_error_errno(r, "Failed to parse systemd.factory_reset kernel command line argument: %m");
if (r > 0) {
arg_factory_reset = b;
if (b)
log_notice("Honouring factory reset requested via kernel command line.");
}
return 0;
}
static int parse_efi_variable_factory_reset(void) {
_cleanup_free_ char *value = NULL;
int r;
if (arg_factory_reset >= 0) /* Never override what is specified on the process command line */
return 0;
if (!in_initrd()) /* Never honour EFI variable factory reset request outside of the initrd */
return 0;
r = efi_get_variable_string(EFI_SYSTEMD_VARIABLE(FactoryReset), &value);
if (r == -ENOENT || ERRNO_IS_NOT_SUPPORTED(r))
return 0;
if (r < 0)
return log_error_errno(r, "Failed to read EFI variable FactoryReset: %m");
r = parse_boolean(value);
if (r < 0)
return log_error_errno(r, "Failed to parse EFI variable FactoryReset: %m");
arg_factory_reset = r;
if (r)
log_notice("Factory reset requested via EFI variable FactoryReset.");
return 0;
}
static int remove_efi_variable_factory_reset(void) {
int r;
r = efi_set_variable(EFI_SYSTEMD_VARIABLE(FactoryReset), NULL, 0);
if (r == -ENOENT || ERRNO_IS_NOT_SUPPORTED(r))
return 0;
if (r < 0)
return log_error_errno(r, "Failed to remove EFI variable FactoryReset: %m");
log_info("Successfully unset EFI variable FactoryReset.");
return 0;
}
static int acquire_root_devno(
const char *p,
const char *root,
int mode,
char **ret,
int *ret_fd) {
_cleanup_free_ char *found_path = NULL;
dev_t devno, fd_devno = MODE_INVALID;
_cleanup_close_ int fd = -EBADF;
struct stat st;
int r;
assert(p);
assert(ret);
assert(ret_fd);
fd = chase_symlinks_and_open(p, root, CHASE_PREFIX_ROOT, mode, &found_path);
if (fd < 0)
return fd;
if (fstat(fd, &st) < 0)
return -errno;
if (S_ISREG(st.st_mode)) {
*ret = TAKE_PTR(found_path);
*ret_fd = TAKE_FD(fd);
return 0;
}
if (S_ISBLK(st.st_mode)) {
/* Refuse referencing explicit block devices if a root dir is specified, after all we should
* not be able to leave the image the root path constrains us to. */
if (root)
return -EPERM;
fd_devno = devno = st.st_rdev;
} else if (S_ISDIR(st.st_mode)) {
devno = st.st_dev;
if (major(devno) == 0) {
r = btrfs_get_block_device_fd(fd, &devno);
if (r == -ENOTTY) /* not btrfs */
return -ENODEV;
if (r < 0)
return r;
}
} else
return -ENOTBLK;
/* From dm-crypt to backing partition */
r = block_get_originating(devno, &devno);
if (r == -ENOENT)
log_debug_errno(r, "Device '%s' has no dm-crypt/dm-verity device, no need to look for underlying block device.", p);
else if (r < 0)
log_debug_errno(r, "Failed to find underlying block device for '%s', ignoring: %m", p);
/* From partition to whole disk containing it */
r = block_get_whole_disk(devno, &devno);
if (r < 0)
log_debug_errno(r, "Failed to find whole disk block device for '%s', ignoring: %m", p);
r = devname_from_devnum(S_IFBLK, devno, ret);
if (r < 0)
return log_debug_errno(r, "Failed to determine canonical path for '%s': %m", p);
/* Only if we still look at the same block device we can reuse the fd. Otherwise return an
* invalidated fd. */
*ret_fd = fd_devno != MODE_INVALID && fd_devno == devno ? TAKE_FD(fd) : -1;
return 0;
}
static int find_root(Context *context) {
_cleanup_free_ char *device = NULL;
int r;
assert(context);
if (arg_node) {
if (arg_empty == EMPTY_CREATE) {
_cleanup_close_ int fd = -EBADF;
_cleanup_free_ char *s = NULL;
s = strdup(arg_node);
if (!s)
return log_oom();
fd = open(arg_node, O_RDONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOFOLLOW, 0666);
if (fd < 0)
return log_error_errno(errno, "Failed to create '%s': %m", arg_node);
context->node = TAKE_PTR(s);
context->node_is_our_file = true;
context->backing_fd = TAKE_FD(fd);
return 0;
}
/* Note that we don't specify a root argument here: if the user explicitly configured a node
* we'll take it relative to the host, not the image */
r = acquire_root_devno(arg_node, NULL, O_RDONLY|O_CLOEXEC, &context->node, &context->backing_fd);
if (r == -EUCLEAN)
return btrfs_log_dev_root(LOG_ERR, r, arg_node);
if (r < 0)
return log_error_errno(r, "Failed to open file or determine backing device of %s: %m", arg_node);
return 0;
}
assert(IN_SET(arg_empty, EMPTY_REFUSE, EMPTY_ALLOW));
/* If the root mount has been replaced by some form of volatile file system (overlayfs), the
* original root block device node is symlinked in /run/systemd/volatile-root. Let's read that
* here. */
r = readlink_malloc("/run/systemd/volatile-root", &device);
if (r == -ENOENT) { /* volatile-root not found */
/* Let's search for the root device. We look for two cases here: first in /, and then in /usr. The
* latter we check for cases where / is a tmpfs and only /usr is an actual persistent block device
* (think: volatile setups) */
FOREACH_STRING(p, "/", "/usr") {
r = acquire_root_devno(p, arg_root, O_RDONLY|O_DIRECTORY|O_CLOEXEC, &context->node,
&context->backing_fd);
if (r < 0) {
if (r == -EUCLEAN)
return btrfs_log_dev_root(LOG_ERR, r, p);
if (r != -ENODEV)
return log_error_errno(r, "Failed to determine backing device of %s: %m", p);
} else
return 0;
}
} else if (r < 0)
return log_error_errno(r, "Failed to read symlink /run/systemd/volatile-root: %m");
else {
r = acquire_root_devno(device, NULL, O_RDONLY|O_CLOEXEC, &context->node, &context->backing_fd);
if (r == -EUCLEAN)
return btrfs_log_dev_root(LOG_ERR, r, device);
if (r < 0)
return log_error_errno(r, "Failed to open file or determine backing device of %s: %m", device);
return 0;
}
return log_error_errno(SYNTHETIC_ERRNO(ENODEV), "Failed to discover root block device.");
}
static int resize_pt(int fd, uint64_t sector_size) {
_cleanup_(fdisk_unref_contextp) struct fdisk_context *c = NULL;
int r;
/* After resizing the backing file we need to resize the partition table itself too, so that it takes
* possession of the enlarged backing file. For this it suffices to open the device with libfdisk and
* immediately write it again, with no changes. */
r = fdisk_new_context_fd(fd, /* read_only= */ false, sector_size, &c);
if (r < 0)
return log_error_errno(r, "Failed to open device '%s': %m", FORMAT_PROC_FD_PATH(fd));
r = fdisk_has_label(c);
if (r < 0)
return log_error_errno(r, "Failed to determine whether disk '%s' has a disk label: %m", FORMAT_PROC_FD_PATH(fd));
if (r == 0) {
log_debug("Not resizing partition table, as there currently is none.");
return 0;
}
r = fdisk_write_disklabel(c);
if (r < 0)
return log_error_errno(r, "Failed to write resized partition table: %m");
log_info("Resized partition table.");
return 1;
}
static int resize_backing_fd(
const char *node, /* The primary way we access the disk image to operate on */
int *fd, /* An O_RDONLY fd referring to that inode */
const char *backing_file, /* If the above refers to a loopback device, the backing regular file for that, which we can grow */
LoopDevice *loop_device,
uint64_t sector_size) {
_cleanup_close_ int writable_fd = -EBADF;
uint64_t current_size;
struct stat st;
int r;
assert(node);
assert(fd);
if (arg_size == UINT64_MAX) /* Nothing to do */
return 0;
if (*fd < 0) {
/* Open the file if we haven't opened it yet. Note that we open it read-only here, just to
* keep a reference to the file we can pass around. */
*fd = open(node, O_RDONLY|O_CLOEXEC);
if (*fd < 0)
return log_error_errno(errno, "Failed to open '%s' in order to adjust size: %m", node);
}
if (fstat(*fd, &st) < 0)
return log_error_errno(errno, "Failed to stat '%s': %m", node);
if (S_ISBLK(st.st_mode)) {
if (!backing_file)
return log_error_errno(SYNTHETIC_ERRNO(EBADF), "Cannot resize block device '%s'.", node);
assert(loop_device);
if (ioctl(*fd, BLKGETSIZE64, &current_size) < 0)
return log_error_errno(errno, "Failed to determine size of block device %s: %m", node);
} else {
r = stat_verify_regular(&st);
if (r < 0)
return log_error_errno(r, "Specified path '%s' is not a regular file or loopback block device, cannot resize: %m", node);
assert(!backing_file);
assert(!loop_device);
current_size = st.st_size;
}
if (current_size >= arg_size) {
log_info("File '%s' already is of requested size or larger, not growing. (%s >= %s)",
node, FORMAT_BYTES(current_size), FORMAT_BYTES(arg_size));
return 0;
}
if (S_ISBLK(st.st_mode)) {
assert(backing_file);
/* This is a loopback device. We can't really grow those directly, but we can grow the
* backing file, hence let's do that. */
writable_fd = open(backing_file, O_WRONLY|O_CLOEXEC|O_NONBLOCK);
if (writable_fd < 0)
return log_error_errno(errno, "Failed to open backing file '%s': %m", backing_file);
if (fstat(writable_fd, &st) < 0)
return log_error_errno(errno, "Failed to stat() backing file '%s': %m", backing_file);
r = stat_verify_regular(&st);
if (r < 0)
return log_error_errno(r, "Backing file '%s' of block device is not a regular file: %m", backing_file);
if ((uint64_t) st.st_size != current_size)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Size of backing file '%s' of loopback block device '%s' don't match, refusing.",
node, backing_file);
} else {
assert(S_ISREG(st.st_mode));
assert(!backing_file);
/* The file descriptor is read-only. In order to grow the file we need to have a writable fd. We
* reopen the file for that temporarily. We keep the writable fd only open for this operation though,
* as fdisk can't accept it anyway. */
writable_fd = fd_reopen(*fd, O_WRONLY|O_CLOEXEC);
if (writable_fd < 0)
return log_error_errno(writable_fd, "Failed to reopen backing file '%s' writable: %m", node);
}
if (!arg_discard) {
if (fallocate(writable_fd, 0, 0, arg_size) < 0) {
if (!ERRNO_IS_NOT_SUPPORTED(errno))
return log_error_errno(errno, "Failed to grow '%s' from %s to %s by allocation: %m",
node, FORMAT_BYTES(current_size), FORMAT_BYTES(arg_size));
/* Fallback to truncation, if fallocate() is not supported. */
log_debug("Backing file system does not support fallocate(), falling back to ftruncate().");
} else {
if (current_size == 0) /* Likely regular file just created by us */
log_info("Allocated %s for '%s'.", FORMAT_BYTES(arg_size), node);
else
log_info("File '%s' grown from %s to %s by allocation.",
node, FORMAT_BYTES(current_size), FORMAT_BYTES(arg_size));
goto done;
}
}
if (ftruncate(writable_fd, arg_size) < 0)
return log_error_errno(errno, "Failed to grow '%s' from %s to %s by truncation: %m",
node, FORMAT_BYTES(current_size), FORMAT_BYTES(arg_size));
if (current_size == 0) /* Likely regular file just created by us */
log_info("Sized '%s' to %s.", node, FORMAT_BYTES(arg_size));
else
log_info("File '%s' grown from %s to %s by truncation.",
node, FORMAT_BYTES(current_size), FORMAT_BYTES(arg_size));
done:
r = resize_pt(writable_fd, sector_size);
if (r < 0)
return r;
if (loop_device) {
r = loop_device_refresh_size(loop_device, UINT64_MAX, arg_size);
if (r < 0)
return log_error_errno(r, "Failed to update loop device size: %m");
}
return 1;
}
static int determine_auto_size(Context *c) {
uint64_t sum;
assert(c);
sum = round_up_size(GPT_METADATA_SIZE, 4096);
LIST_FOREACH(partitions, p, c->partitions) {
uint64_t m;
if (p->dropped)
continue;
m = partition_min_size_with_padding(c, p);
if (m > UINT64_MAX - sum)
return log_error_errno(SYNTHETIC_ERRNO(EOVERFLOW), "Image would grow too large, refusing.");
sum += m;
}
if (c->total != UINT64_MAX)
/* Image already allocated? Then show its size. */
log_info("Automatically determined minimal disk image size as %s, current image size is %s.",
FORMAT_BYTES(sum), FORMAT_BYTES(c->total));
else
/* If the image is being created right now, then it has no previous size, suppress any comment about it hence. */
log_info("Automatically determined minimal disk image size as %s.",
FORMAT_BYTES(sum));
arg_size = sum;
return 0;
}
static int run(int argc, char *argv[]) {
_cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
_cleanup_(umount_and_rmdir_and_freep) char *mounted_dir = NULL;
_cleanup_(context_freep) Context* context = NULL;
bool node_is_our_loop = false;
int r;
log_show_color(true);
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
return r;
r = parse_proc_cmdline_factory_reset();
if (r < 0)
return r;
r = parse_efi_variable_factory_reset();
if (r < 0)
return r;
#if HAVE_LIBCRYPTSETUP
cryptsetup_enable_logging(NULL);
#endif
if (arg_image) {
assert(!arg_root);
/* Mount this strictly read-only: we shall modify the partition table, not the file
* systems */
r = mount_image_privately_interactively(
arg_image,
DISSECT_IMAGE_MOUNT_READ_ONLY |
(arg_node ? DISSECT_IMAGE_DEVICE_READ_ONLY : 0) | /* If a different node to make changes to is specified let's open the device in read-only mode) */
DISSECT_IMAGE_GPT_ONLY |
DISSECT_IMAGE_RELAX_VAR_CHECK |
DISSECT_IMAGE_USR_NO_ROOT |
DISSECT_IMAGE_REQUIRE_ROOT,
&mounted_dir,
&loop_device);
if (r < 0)
return r;
arg_root = strdup(mounted_dir);
if (!arg_root)
return log_oom();
if (!arg_node) {
arg_node = strdup(loop_device->node);
if (!arg_node)
return log_oom();
/* Remember that the device we are about to manipulate is actually the one we
* allocated here, and thus to increase its backing file we know what to do */
node_is_our_loop = true;
}
}
context = context_new(arg_seed);
if (!context)
return log_oom();
strv_uniq(arg_definitions);
r = context_read_definitions(context, arg_definitions, arg_root);
if (r < 0)
return r;
r = find_root(context);
if (r < 0)
return r;
if (arg_size != UINT64_MAX) {
r = resize_backing_fd(
context->node,
&context->backing_fd,
node_is_our_loop ? arg_image : NULL,
node_is_our_loop ? loop_device : NULL,
context->sector_size);
if (r < 0)
return r;
}
r = context_load_partition_table(context);
if (r == -EHWPOISON)
return 77; /* Special return value which means "Not GPT, so not doing anything". This isn't
* really an error when called at boot. */
if (r < 0)
return r;
context->from_scratch = r > 0; /* Starting from scratch */
if (arg_can_factory_reset) {
r = context_can_factory_reset(context);
if (r < 0)
return r;
if (r == 0)
return EXIT_FAILURE;
return 0;
}
r = context_factory_reset(context);
if (r < 0)
return r;
if (r > 0) {
/* We actually did a factory reset! */
r = remove_efi_variable_factory_reset();
if (r < 0)
return r;
/* Reload the reduced partition table */
context_unload_partition_table(context);
r = context_load_partition_table(context);
if (r < 0)
return r;
}
r = context_read_seed(context, arg_root);
if (r < 0)
return r;
/* Make sure each partition has a unique UUID and unique label */
r = context_acquire_partition_uuids_and_labels(context);
if (r < 0)
return r;
r = context_minimize(context);
if (r < 0)
return r;
/* Open all files to copy blocks from now, since we want to take their size into consideration */
r = context_open_copy_block_paths(
context,
loop_device ? loop_device->devno : /* if --image= is specified, only allow partitions on the loopback device */
arg_root && !arg_image ? 0 : /* if --root= is specified, don't accept any block device */
(dev_t) -1); /* if neither is specified, make no restrictions */
if (r < 0)
return r;
if (arg_size_auto) {
r = determine_auto_size(context);
if (r < 0)
return r;
/* Flush out everything again, and let's grow the file first, then start fresh */
context_unload_partition_table(context);
assert(arg_size != UINT64_MAX);
r = resize_backing_fd(
context->node,
&context->backing_fd,
node_is_our_loop ? arg_image : NULL,
node_is_our_loop ? loop_device : NULL,
context->sector_size);
if (r < 0)
return r;
r = context_load_partition_table(context);
if (r < 0)
return r;
}
/* First try to fit new partitions in, dropping by priority until it fits */
for (;;) {
uint64_t largest_free_area;
if (context_allocate_partitions(context, &largest_free_area))
break; /* Success! */
if (!context_drop_or_foreignize_one_priority(context)) {
r = log_error_errno(SYNTHETIC_ERRNO(ENOSPC),
"Can't fit requested partitions into available free space (%s), refusing.",
FORMAT_BYTES(largest_free_area));
determine_auto_size(context);
return r;
}
}
/* Now assign free space according to the weight logic */
r = context_grow_partitions(context);
if (r < 0)
return r;
/* Now calculate where each new partition gets placed */
context_place_partitions(context);
(void) context_dump(context, /*late=*/ false);
r = context_write_partition_table(context);
if (r < 0)
return r;
r = context_split(context);
if (r < 0)
return r;
(void) context_dump(context, /*late=*/ true);
context->node = mfree(context->node);
LIST_FOREACH(partitions, p, context->partitions)
p->split_path = mfree(p->split_path);
return 0;
}
DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);