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third-party-mirror / systemd / 2398d87694e8af48e92ff8fb5f9cf273f706fb00 / . / src / tmpfiles / tmpfiles.c
blob: 7e85c506348a153b3a449109f0c6b3feb2b56a6e [file] [log] [blame]
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <getopt.h>
#include <limits.h>
#include <linux/fs.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdlib.h>
#include <sys/file.h>
#include <sys/xattr.h>
#include <sysexits.h>
#include <time.h>
#include <unistd.h>
#include "sd-path.h"
#include "acl-util.h"
#include "alloc-util.h"
#include "btrfs-util.h"
#include "capability-util.h"
#include "chattr-util.h"
#include "conf-files.h"
#include "copy.h"
#include "def.h"
#include "dirent-util.h"
#include "dissect-image.h"
#include "env-util.h"
#include "escape.h"
#include "fd-util.h"
#include "fileio.h"
#include "format-util.h"
#include "fs-util.h"
#include "glob-util.h"
#include "io-util.h"
#include "label.h"
#include "log.h"
#include "macro.h"
#include "main-func.h"
#include "missing_stat.h"
#include "missing_syscall.h"
#include "mkdir.h"
#include "mount-util.h"
#include "mountpoint-util.h"
#include "offline-passwd.h"
#include "pager.h"
#include "parse-argument.h"
#include "parse-util.h"
#include "path-lookup.h"
#include "path-util.h"
#include "pretty-print.h"
#include "rlimit-util.h"
#include "rm-rf.h"
#include "selinux-util.h"
#include "set.h"
#include "sort-util.h"
#include "specifier.h"
#include "stat-util.h"
#include "stdio-util.h"
#include "string-table.h"
#include "string-util.h"
#include "strv.h"
#include "terminal-util.h"
#include "umask-util.h"
#include "user-util.h"
/* This reads all files listed in /etc/tmpfiles.d/?*.conf and creates
* them in the file system. This is intended to be used to create
* properly owned directories beneath /tmp, /var/tmp, /run, which are
* volatile and hence need to be recreated on bootup. */
typedef enum OperationMask {
OPERATION_CREATE = 1 << 0,
OPERATION_REMOVE = 1 << 1,
OPERATION_CLEAN = 1 << 2,
} OperationMask;
typedef enum ItemType {
/* These ones take file names */
CREATE_FILE = 'f',
TRUNCATE_FILE = 'F', /* deprecated: use f+ */
CREATE_DIRECTORY = 'd',
TRUNCATE_DIRECTORY = 'D',
CREATE_SUBVOLUME = 'v',
CREATE_SUBVOLUME_INHERIT_QUOTA = 'q',
CREATE_SUBVOLUME_NEW_QUOTA = 'Q',
CREATE_FIFO = 'p',
CREATE_SYMLINK = 'L',
CREATE_CHAR_DEVICE = 'c',
CREATE_BLOCK_DEVICE = 'b',
COPY_FILES = 'C',
/* These ones take globs */
WRITE_FILE = 'w',
EMPTY_DIRECTORY = 'e',
SET_XATTR = 't',
RECURSIVE_SET_XATTR = 'T',
SET_ACL = 'a',
RECURSIVE_SET_ACL = 'A',
SET_ATTRIBUTE = 'h',
RECURSIVE_SET_ATTRIBUTE = 'H',
IGNORE_PATH = 'x',
IGNORE_DIRECTORY_PATH = 'X',
REMOVE_PATH = 'r',
RECURSIVE_REMOVE_PATH = 'R',
RELABEL_PATH = 'z',
RECURSIVE_RELABEL_PATH = 'Z',
ADJUST_MODE = 'm', /* legacy, 'z' is identical to this */
} ItemType;
typedef enum AgeBy {
AGE_BY_ATIME = 1 << 0,
AGE_BY_BTIME = 1 << 1,
AGE_BY_CTIME = 1 << 2,
AGE_BY_MTIME = 1 << 3,
/* All file timestamp types are checked by default. */
AGE_BY_DEFAULT_FILE = AGE_BY_ATIME | AGE_BY_BTIME | AGE_BY_CTIME | AGE_BY_MTIME,
AGE_BY_DEFAULT_DIR = AGE_BY_ATIME | AGE_BY_BTIME | AGE_BY_MTIME
} AgeBy;
typedef struct Item {
ItemType type;
char *path;
char *argument;
char **xattrs;
#if HAVE_ACL
acl_t acl_access;
acl_t acl_default;
#endif
uid_t uid;
gid_t gid;
mode_t mode;
usec_t age;
AgeBy age_by_file, age_by_dir;
dev_t major_minor;
unsigned attribute_value;
unsigned attribute_mask;
bool uid_set:1;
bool gid_set:1;
bool mode_set:1;
bool age_set:1;
bool mask_perms:1;
bool attribute_set:1;
bool keep_first_level:1;
bool append_or_force:1;
bool allow_failure:1;
bool try_replace:1;
OperationMask done;
} Item;
typedef struct ItemArray {
Item *items;
size_t n_items;
struct ItemArray *parent;
Set *children;
} ItemArray;
typedef enum DirectoryType {
DIRECTORY_RUNTIME,
DIRECTORY_STATE,
DIRECTORY_CACHE,
DIRECTORY_LOGS,
_DIRECTORY_TYPE_MAX,
} DirectoryType;
static bool arg_cat_config = false;
static bool arg_user = false;
static OperationMask arg_operation = 0;
static bool arg_boot = false;
static PagerFlags arg_pager_flags = 0;
static char **arg_include_prefixes = NULL;
static char **arg_exclude_prefixes = NULL;
static char *arg_root = NULL;
static char *arg_image = NULL;
static char *arg_replace = NULL;
#define MAX_DEPTH 256
static OrderedHashmap *items = NULL, *globs = NULL;
static Set *unix_sockets = NULL;
STATIC_DESTRUCTOR_REGISTER(items, ordered_hashmap_freep);
STATIC_DESTRUCTOR_REGISTER(globs, ordered_hashmap_freep);
STATIC_DESTRUCTOR_REGISTER(unix_sockets, set_free_freep);
STATIC_DESTRUCTOR_REGISTER(arg_include_prefixes, freep);
STATIC_DESTRUCTOR_REGISTER(arg_exclude_prefixes, freep);
STATIC_DESTRUCTOR_REGISTER(arg_root, freep);
STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
static int specifier_machine_id_safe(char specifier, const void *data, const char *root, const void *userdata, char **ret);
static int specifier_directory(char specifier, const void *data, const char *root, const void *userdata, char **ret);
static const Specifier specifier_table[] = {
{ 'a', specifier_architecture, NULL },
{ 'b', specifier_boot_id, NULL },
{ 'B', specifier_os_build_id, NULL },
{ 'H', specifier_host_name, NULL },
{ 'l', specifier_short_host_name, NULL },
{ 'm', specifier_machine_id_safe, NULL },
{ 'o', specifier_os_id, NULL },
{ 'v', specifier_kernel_release, NULL },
{ 'w', specifier_os_version_id, NULL },
{ 'W', specifier_os_variant_id, NULL },
{ 'h', specifier_user_home, NULL },
{ 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
{ 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
{ 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
{ 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
COMMON_CREDS_SPECIFIERS,
COMMON_TMP_SPECIFIERS,
{}
};
static int specifier_machine_id_safe(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
int r;
/* If /etc/machine_id is missing or empty (e.g. in a chroot environment) return a recognizable error
* so that the caller can skip the rule gracefully. */
r = specifier_machine_id(specifier, data, root, userdata, ret);
if (IN_SET(r, -ENOENT, -ENOMEDIUM))
return -ENXIO;
return r;
}
static int specifier_directory(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
struct table_entry {
uint64_t type;
const char *suffix;
};
static const struct table_entry paths_system[] = {
[DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME },
[DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE },
[DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE },
[DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS },
};
static const struct table_entry paths_user[] = {
[DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME },
[DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION },
[DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE },
[DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
};
const struct table_entry *paths;
_cleanup_free_ char *p = NULL;
unsigned i;
int r;
assert_cc(ELEMENTSOF(paths_system) == ELEMENTSOF(paths_user));
paths = arg_user ? paths_user : paths_system;
i = PTR_TO_UINT(data);
assert(i < ELEMENTSOF(paths_system));
r = sd_path_lookup(paths[i].type, paths[i].suffix, &p);
if (r < 0)
return r;
if (arg_root) {
_cleanup_free_ char *j = NULL;
j = path_join(arg_root, p);
if (!j)
return -ENOMEM;
*ret = TAKE_PTR(j);
} else
*ret = TAKE_PTR(p);
return 0;
}
static int log_unresolvable_specifier(const char *filename, unsigned line) {
static bool notified = false;
/* In system mode, this is called when /etc is not fully initialized (e.g.
* in a chroot environment) where some specifiers are unresolvable. In user
* mode, this is called when some variables are not defined. These cases are
* not considered as an error so log at LOG_NOTICE only for the first time
* and then downgrade this to LOG_DEBUG for the rest. */
log_syntax(NULL,
notified ? LOG_DEBUG : LOG_NOTICE,
filename, line, 0,
"Failed to resolve specifier: %s, skipping",
arg_user ? "Required $XDG_... variable not defined" : "uninitialized /etc detected");
if (!notified)
log_notice("All rules containing unresolvable specifiers will be skipped.");
notified = true;
return 0;
}
static int user_config_paths(char*** ret) {
_cleanup_strv_free_ char **config_dirs = NULL, **data_dirs = NULL;
_cleanup_free_ char *persistent_config = NULL, *runtime_config = NULL, *data_home = NULL;
_cleanup_strv_free_ char **res = NULL;
int r;
r = xdg_user_dirs(&config_dirs, &data_dirs);
if (r < 0)
return r;
r = xdg_user_config_dir(&persistent_config, "/user-tmpfiles.d");
if (r < 0 && r != -ENXIO)
return r;
r = xdg_user_runtime_dir(&runtime_config, "/user-tmpfiles.d");
if (r < 0 && r != -ENXIO)
return r;
r = xdg_user_data_dir(&data_home, "/user-tmpfiles.d");
if (r < 0 && r != -ENXIO)
return r;
r = strv_extend_strv_concat(&res, config_dirs, "/user-tmpfiles.d");
if (r < 0)
return r;
r = strv_extend(&res, persistent_config);
if (r < 0)
return r;
r = strv_extend(&res, runtime_config);
if (r < 0)
return r;
r = strv_extend(&res, data_home);
if (r < 0)
return r;
r = strv_extend_strv_concat(&res, data_dirs, "/user-tmpfiles.d");
if (r < 0)
return r;
r = path_strv_make_absolute_cwd(res);
if (r < 0)
return r;
*ret = TAKE_PTR(res);
return 0;
}
static bool needs_glob(ItemType t) {
return IN_SET(t,
WRITE_FILE,
IGNORE_PATH,
IGNORE_DIRECTORY_PATH,
REMOVE_PATH,
RECURSIVE_REMOVE_PATH,
EMPTY_DIRECTORY,
ADJUST_MODE,
RELABEL_PATH,
RECURSIVE_RELABEL_PATH,
SET_XATTR,
RECURSIVE_SET_XATTR,
SET_ACL,
RECURSIVE_SET_ACL,
SET_ATTRIBUTE,
RECURSIVE_SET_ATTRIBUTE);
}
static bool takes_ownership(ItemType t) {
return IN_SET(t,
CREATE_FILE,
TRUNCATE_FILE,
CREATE_DIRECTORY,
EMPTY_DIRECTORY,
TRUNCATE_DIRECTORY,
CREATE_SUBVOLUME,
CREATE_SUBVOLUME_INHERIT_QUOTA,
CREATE_SUBVOLUME_NEW_QUOTA,
CREATE_FIFO,
CREATE_SYMLINK,
CREATE_CHAR_DEVICE,
CREATE_BLOCK_DEVICE,
COPY_FILES,
WRITE_FILE,
IGNORE_PATH,
IGNORE_DIRECTORY_PATH,
REMOVE_PATH,
RECURSIVE_REMOVE_PATH);
}
static struct Item* find_glob(OrderedHashmap *h, const char *match) {
ItemArray *j;
ORDERED_HASHMAP_FOREACH(j, h) {
size_t n;
for (n = 0; n < j->n_items; n++) {
Item *item = j->items + n;
if (fnmatch(item->path, match, FNM_PATHNAME|FNM_PERIOD) == 0)
return item;
}
}
return NULL;
}
static int load_unix_sockets(void) {
_cleanup_set_free_free_ Set *sockets = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
if (unix_sockets)
return 0;
/* We maintain a cache of the sockets we found in /proc/net/unix to speed things up a little. */
sockets = set_new(&path_hash_ops);
if (!sockets)
return log_oom();
f = fopen("/proc/net/unix", "re");
if (!f)
return log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, errno,
"Failed to open /proc/net/unix, ignoring: %m");
/* Skip header */
r = read_line(f, LONG_LINE_MAX, NULL);
if (r < 0)
return log_warning_errno(r, "Failed to skip /proc/net/unix header line: %m");
if (r == 0)
return log_warning_errno(SYNTHETIC_ERRNO(EIO), "Premature end of file reading /proc/net/unix.");
for (;;) {
_cleanup_free_ char *line = NULL, *s = NULL;
char *p;
r = read_line(f, LONG_LINE_MAX, &line);
if (r < 0)
return log_warning_errno(r, "Failed to read /proc/net/unix line, ignoring: %m");
if (r == 0) /* EOF */
break;
p = strchr(line, ':');
if (!p)
continue;
if (strlen(p) < 37)
continue;
p += 37;
p += strspn(p, WHITESPACE);
p += strcspn(p, WHITESPACE); /* skip one more word */
p += strspn(p, WHITESPACE);
if (*p != '/')
continue;
s = strdup(p);
if (!s)
return log_oom();
path_simplify(s);
r = set_consume(sockets, s);
if (r == -EEXIST)
continue;
if (r < 0)
return log_warning_errno(r, "Failed to add AF_UNIX socket to set, ignoring: %m");
TAKE_PTR(s);
}
unix_sockets = TAKE_PTR(sockets);
return 1;
}
static bool unix_socket_alive(const char *fn) {
assert(fn);
if (load_unix_sockets() < 0)
return true; /* We don't know, so assume yes */
return !!set_get(unix_sockets, (char*) fn);
}
static DIR* xopendirat_nomod(int dirfd, const char *path) {
DIR *dir;
dir = xopendirat(dirfd, path, O_NOFOLLOW|O_NOATIME);
if (dir)
return dir;
log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
if (errno != EPERM)
return NULL;
dir = xopendirat(dirfd, path, O_NOFOLLOW);
if (!dir)
log_debug_errno(errno, "Cannot open %sdirectory \"%s\": %m", dirfd == AT_FDCWD ? "" : "sub", path);
return dir;
}
static DIR* opendir_nomod(const char *path) {
return xopendirat_nomod(AT_FDCWD, path);
}
static inline nsec_t load_statx_timestamp_nsec(const struct statx_timestamp *ts) {
assert(ts);
if (ts->tv_sec < 0)
return NSEC_INFINITY;
if ((nsec_t) ts->tv_sec >= (UINT64_MAX - ts->tv_nsec) / NSEC_PER_SEC)
return NSEC_INFINITY;
return ts->tv_sec * NSEC_PER_SEC + ts->tv_nsec;
}
static bool needs_cleanup(
nsec_t atime,
nsec_t btime,
nsec_t ctime,
nsec_t mtime,
nsec_t cutoff,
const char *sub_path,
AgeBy age_by,
bool is_dir) {
if (FLAGS_SET(age_by, AGE_BY_MTIME) && mtime != NSEC_INFINITY && mtime >= cutoff) {
char a[FORMAT_TIMESTAMP_MAX];
/* Follows spelling in stat(1). */
log_debug("%s \"%s\": modify time %s is too new.",
is_dir ? "Directory" : "File",
sub_path,
format_timestamp_style(a, sizeof(a), mtime / NSEC_PER_USEC, TIMESTAMP_US));
return false;
}
if (FLAGS_SET(age_by, AGE_BY_ATIME) && atime != NSEC_INFINITY && atime >= cutoff) {
char a[FORMAT_TIMESTAMP_MAX];
log_debug("%s \"%s\": access time %s is too new.",
is_dir ? "Directory" : "File",
sub_path,
format_timestamp_style(a, sizeof(a), atime / NSEC_PER_USEC, TIMESTAMP_US));
return false;
}
/*
* Note: Unless explicitly specified by the user, "ctime" is ignored
* by default for directories, because we change it when deleting.
*/
if (FLAGS_SET(age_by, AGE_BY_CTIME) && ctime != NSEC_INFINITY && ctime >= cutoff) {
char a[FORMAT_TIMESTAMP_MAX];
log_debug("%s \"%s\": change time %s is too new.",
is_dir ? "Directory" : "File",
sub_path,
format_timestamp_style(a, sizeof(a), ctime / NSEC_PER_USEC, TIMESTAMP_US));
return false;
}
if (FLAGS_SET(age_by, AGE_BY_BTIME) && btime != NSEC_INFINITY && btime >= cutoff) {
char a[FORMAT_TIMESTAMP_MAX];
log_debug("%s \"%s\": birth time %s is too new.",
is_dir ? "Directory" : "File",
sub_path,
format_timestamp_style(a, sizeof(a), btime / NSEC_PER_USEC, TIMESTAMP_US));
return false;
}
return true;
}
static int dir_cleanup(
Item *i,
const char *p,
DIR *d,
nsec_t self_atime_nsec,
nsec_t self_mtime_nsec,
nsec_t cutoff_nsec,
dev_t rootdev_major,
dev_t rootdev_minor,
bool mountpoint,
int maxdepth,
bool keep_this_level,
AgeBy age_by_file,
AgeBy age_by_dir) {
bool deleted = false;
struct dirent *dent;
int r = 0;
FOREACH_DIRENT_ALL(dent, d, break) {
_cleanup_free_ char *sub_path = NULL;
nsec_t atime_nsec, mtime_nsec, ctime_nsec, btime_nsec;
if (dot_or_dot_dot(dent->d_name))
continue;
/* If statx() is supported, use it. It's preferable over fstatat() since it tells us
* explicitly where we are looking at a mount point, for free as side information. Determining
* the same information without statx() is hard, see the complexity of path_is_mount_point(),
* and also much slower as it requires a number of syscalls instead of just one. Hence, when
* we have modern statx() we use it instead of fstat() and do proper mount point checks,
* while on older kernels's well do traditional st_dev based detection of mount points.
*
* Using statx() for detecting mount points also has the benfit that we handle weird file
* systems such as overlayfs better where each file is originating from a different
* st_dev. */
STRUCT_STATX_DEFINE(sx);
r = statx_fallback(
dirfd(d), dent->d_name,
AT_SYMLINK_NOFOLLOW|AT_NO_AUTOMOUNT,
STATX_TYPE|STATX_MODE|STATX_UID|STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_BTIME,
&sx);
if (r == -ENOENT)
continue;
if (r < 0) {
/* FUSE, NFS mounts, SELinux might return EACCES */
r = log_full_errno(errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
"statx(%s/%s) failed: %m", p, dent->d_name);
continue;
}
if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT)) {
/* Yay, we have the mount point API, use it */
if (FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT)) {
log_debug("Ignoring \"%s/%s\": different mount points.", p, dent->d_name);
continue;
}
} else {
/* So we might have statx() but the STATX_ATTR_MOUNT_ROOT flag is not supported, fall
* back to traditional stx_dev checking. */
if (sx.stx_dev_major != rootdev_major ||
sx.stx_dev_minor != rootdev_minor) {
log_debug("Ignoring \"%s/%s\": different filesystem.", p, dent->d_name);
continue;
}
/* Try to detect bind mounts of the same filesystem instance; they do not differ in device
* major/minors. This type of query is not supported on all kernels or filesystem types
* though. */
if (S_ISDIR(sx.stx_mode)) {
int q;
q = fd_is_mount_point(dirfd(d), dent->d_name, 0);
if (q < 0)
log_debug_errno(q, "Failed to determine whether \"%s/%s\" is a mount point, ignoring: %m", p, dent->d_name);
else if (q > 0) {
log_debug("Ignoring \"%s/%s\": different mount of the same filesystem.", p, dent->d_name);
continue;
}
}
}
atime_nsec = FLAGS_SET(sx.stx_mask, STATX_ATIME) ? load_statx_timestamp_nsec(&sx.stx_atime) : 0;
mtime_nsec = FLAGS_SET(sx.stx_mask, STATX_MTIME) ? load_statx_timestamp_nsec(&sx.stx_mtime) : 0;
ctime_nsec = FLAGS_SET(sx.stx_mask, STATX_CTIME) ? load_statx_timestamp_nsec(&sx.stx_ctime) : 0;
btime_nsec = FLAGS_SET(sx.stx_mask, STATX_BTIME) ? load_statx_timestamp_nsec(&sx.stx_btime) : 0;
sub_path = path_join(p, dent->d_name);
if (!sub_path) {
r = log_oom();
goto finish;
}
/* Is there an item configured for this path? */
if (ordered_hashmap_get(items, sub_path)) {
log_debug("Ignoring \"%s\": a separate entry exists.", sub_path);
continue;
}
if (find_glob(globs, sub_path)) {
log_debug("Ignoring \"%s\": a separate glob exists.", sub_path);
continue;
}
if (S_ISDIR(sx.stx_mode)) {
_cleanup_closedir_ DIR *sub_dir = NULL;
if (mountpoint &&
streq(dent->d_name, "lost+found") &&
sx.stx_uid == 0) {
log_debug("Ignoring directory \"%s\".", sub_path);
continue;
}
if (maxdepth <= 0)
log_warning("Reached max depth on \"%s\".", sub_path);
else {
int q;
sub_dir = xopendirat_nomod(dirfd(d), dent->d_name);
if (!sub_dir) {
if (errno != ENOENT)
r = log_warning_errno(errno, "Opening directory \"%s\" failed, ignoring: %m", sub_path);
continue;
}
if (flock(dirfd(sub_dir), LOCK_EX|LOCK_NB) < 0) {
log_debug_errno(errno, "Couldn't acquire shared BSD lock on directory \"%s\", skipping: %m", p);
continue;
}
q = dir_cleanup(i,
sub_path, sub_dir,
atime_nsec, mtime_nsec, cutoff_nsec,
rootdev_major, rootdev_minor,
false, maxdepth-1, false,
age_by_file, age_by_dir);
if (q < 0)
r = q;
}
/* Note: if you are wondering why we don't support the sticky bit for excluding
* directories from cleaning like we do it for other file system objects: well, the
* sticky bit already has a meaning for directories, so we don't want to overload
* that. */
if (keep_this_level) {
log_debug("Keeping directory \"%s\".", sub_path);
continue;
}
/*
* Check the file timestamps of an entry against the
* given cutoff time; delete if it is older.
*/
if (!needs_cleanup(atime_nsec, btime_nsec, ctime_nsec, mtime_nsec,
cutoff_nsec, sub_path, age_by_dir, true))
continue;
log_debug("Removing directory \"%s\".", sub_path);
if (unlinkat(dirfd(d), dent->d_name, AT_REMOVEDIR) < 0)
if (!IN_SET(errno, ENOENT, ENOTEMPTY))
r = log_warning_errno(errno, "Failed to remove directory \"%s\", ignoring: %m", sub_path);
} else {
/* Skip files for which the sticky bit is set. These are semantics we define, and are
* unknown elsewhere. See XDG_RUNTIME_DIR specification for details. */
if (sx.stx_mode & S_ISVTX) {
log_debug("Skipping \"%s\": sticky bit set.", sub_path);
continue;
}
if (mountpoint &&
S_ISREG(sx.stx_mode) &&
sx.stx_uid == 0 &&
STR_IN_SET(dent->d_name,
".journal",
"aquota.user",
"aquota.group")) {
log_debug("Skipping \"%s\".", sub_path);
continue;
}
/* Ignore sockets that are listed in /proc/net/unix */
if (S_ISSOCK(sx.stx_mode) && unix_socket_alive(sub_path)) {
log_debug("Skipping \"%s\": live socket.", sub_path);
continue;
}
/* Ignore device nodes */
if (S_ISCHR(sx.stx_mode) || S_ISBLK(sx.stx_mode)) {
log_debug("Skipping \"%s\": a device.", sub_path);
continue;
}
/* Keep files on this level around if this is requested */
if (keep_this_level) {
log_debug("Keeping \"%s\".", sub_path);
continue;
}
if (!needs_cleanup(atime_nsec, btime_nsec, ctime_nsec, mtime_nsec,
cutoff_nsec, sub_path, age_by_file, false))
continue;
log_debug("Removing \"%s\".", sub_path);
if (unlinkat(dirfd(d), dent->d_name, 0) < 0)
if (errno != ENOENT)
r = log_warning_errno(errno, "Failed to remove \"%s\", ignoring: %m", sub_path);
deleted = true;
}
}
finish:
if (deleted) {
char a[FORMAT_TIMESTAMP_MAX], m[FORMAT_TIMESTAMP_MAX];
struct timespec ts[2];
log_debug("Restoring access and modification time on \"%s\": %s, %s",
p,
format_timestamp_style(a, sizeof(a), self_atime_nsec / NSEC_PER_USEC, TIMESTAMP_US),
format_timestamp_style(m, sizeof(m), self_mtime_nsec / NSEC_PER_USEC, TIMESTAMP_US));
timespec_store_nsec(ts + 0, self_atime_nsec);
timespec_store_nsec(ts + 1, self_mtime_nsec);
/* Restore original directory timestamps */
if (futimens(dirfd(d), ts) < 0)
log_warning_errno(errno, "Failed to revert timestamps of '%s', ignoring: %m", p);
}
return r;
}
static bool dangerous_hardlinks(void) {
_cleanup_free_ char *value = NULL;
static int cached = -1;
int r;
/* Check whether the fs.protected_hardlinks sysctl is on. If we can't determine it we assume its off, as that's
* what the upstream default is. */
if (cached >= 0)
return cached;
r = read_one_line_file("/proc/sys/fs/protected_hardlinks", &value);
if (r < 0) {
log_debug_errno(r, "Failed to read fs.protected_hardlinks sysctl: %m");
return true;
}
r = parse_boolean(value);
if (r < 0) {
log_debug_errno(r, "Failed to parse fs.protected_hardlinks sysctl: %m");
return true;
}
cached = r == 0;
return cached;
}
static bool hardlink_vulnerable(const struct stat *st) {
assert(st);
return !S_ISDIR(st->st_mode) && st->st_nlink > 1 && dangerous_hardlinks();
}
static mode_t process_mask_perms(mode_t mode, mode_t current) {
if ((current & 0111) == 0)
mode &= ~0111;
if ((current & 0222) == 0)
mode &= ~0222;
if ((current & 0444) == 0)
mode &= ~0444;
if (!S_ISDIR(current))
mode &= ~07000; /* remove sticky/sgid/suid bit, unless directory */
return mode;
}
static int fd_set_perms(Item *i, int fd, const char *path, const struct stat *st) {
struct stat stbuf;
mode_t new_mode;
bool do_chown;
int r;
assert(i);
assert(fd >= 0);
assert(path);
if (!i->mode_set && !i->uid_set && !i->gid_set)
goto shortcut;
if (!st) {
if (fstat(fd, &stbuf) < 0)
return log_error_errno(errno, "fstat(%s) failed: %m", path);
st = &stbuf;
}
if (hardlink_vulnerable(st))
return log_error_errno(SYNTHETIC_ERRNO(EPERM),
"Refusing to set permissions on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
path);
/* Do we need a chown()? */
do_chown =
(i->uid_set && i->uid != st->st_uid) ||
(i->gid_set && i->gid != st->st_gid);
/* Calculate the mode to apply */
new_mode = i->mode_set ? (i->mask_perms ?
process_mask_perms(i->mode, st->st_mode) :
i->mode) :
(st->st_mode & 07777);
if (i->mode_set && do_chown) {
/* Before we issue the chmod() let's reduce the access mode to the common bits of the old and
* the new mode. That way there's no time window where the file exists under the old owner
* with more than the old access modes — and not under the new owner with more than the new
* access modes either. */
if (S_ISLNK(st->st_mode))
log_debug("Skipping temporary mode fix for symlink %s.", path);
else {
mode_t m = new_mode & st->st_mode; /* Mask new mode by old mode */
if (((m ^ st->st_mode) & 07777) == 0)
log_debug("\"%s\" matches temporary mode %o already.", path, m);
else {
log_debug("Temporarily changing \"%s\" to mode %o.", path, m);
r = fchmod_opath(fd, m);
if (r < 0)
return log_error_errno(r, "fchmod() of %s failed: %m", path);
}
}
}
if (do_chown) {
log_debug("Changing \"%s\" to owner "UID_FMT":"GID_FMT,
path,
i->uid_set ? i->uid : UID_INVALID,
i->gid_set ? i->gid : GID_INVALID);
if (fchownat(fd,
"",
i->uid_set ? i->uid : UID_INVALID,
i->gid_set ? i->gid : GID_INVALID,
AT_EMPTY_PATH) < 0)
return log_error_errno(errno, "fchownat() of %s failed: %m", path);
}
/* Now, apply the final mode. We do this in two cases: when the user set a mode explicitly, or after a
* chown(), since chown()'s mangle the access mode in regards to sgid/suid in some conditions. */
if (i->mode_set || do_chown) {
if (S_ISLNK(st->st_mode))
log_debug("Skipping mode fix for symlink %s.", path);
else {
/* Check if the chmod() is unnecessary. Note that if we did a chown() before we always
* chmod() here again, since it might have mangled the bits. */
if (!do_chown && ((new_mode ^ st->st_mode) & 07777) == 0)
log_debug("\"%s\" matches mode %o already.", path, new_mode);
else {
log_debug("Changing \"%s\" to mode %o.", path, new_mode);
r = fchmod_opath(fd, new_mode);
if (r < 0)
return log_error_errno(r, "fchmod() of %s failed: %m", path);
}
}
}
shortcut:
return label_fix(path, 0);
}
static int path_open_parent_safe(const char *path) {
_cleanup_free_ char *dn = NULL;
int r, fd;
if (path_equal(path, "/") || !path_is_normalized(path))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Failed to open parent of '%s': invalid path.",
path);
dn = dirname_malloc(path);
if (!dn)
return log_oom();
r = chase_symlinks(dn, arg_root, CHASE_SAFE|CHASE_WARN, NULL, &fd);
if (r < 0 && r != -ENOLINK)
return log_error_errno(r, "Failed to validate path %s: %m", path);
return r < 0 ? r : fd;
}
static int path_open_safe(const char *path) {
int r, fd;
/* path_open_safe() returns a file descriptor opened with O_PATH after
* verifying that the path doesn't contain unsafe transitions, except
* for its final component as the function does not follow symlink. */
assert(path);
if (!path_is_normalized(path))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Failed to open invalid path '%s'.",
path);
r = chase_symlinks(path, arg_root, CHASE_SAFE|CHASE_WARN|CHASE_NOFOLLOW, NULL, &fd);
if (r < 0 && r != -ENOLINK)
return log_error_errno(r, "Failed to validate path %s: %m", path);
return r < 0 ? r : fd;
}
static int path_set_perms(Item *i, const char *path) {
_cleanup_close_ int fd = -1;
assert(i);
assert(path);
fd = path_open_safe(path);
if (fd < 0)
return fd;
return fd_set_perms(i, fd, path, NULL);
}
static int parse_xattrs_from_arg(Item *i) {
const char *p;
int r;
assert(i);
assert(i->argument);
p = i->argument;
for (;;) {
_cleanup_free_ char *name = NULL, *value = NULL, *xattr = NULL;
r = extract_first_word(&p, &xattr, NULL, EXTRACT_UNQUOTE|EXTRACT_CUNESCAPE);
if (r < 0)
log_warning_errno(r, "Failed to parse extended attribute '%s', ignoring: %m", p);
if (r <= 0)
break;
r = split_pair(xattr, "=", &name, &value);
if (r < 0) {
log_warning_errno(r, "Failed to parse extended attribute, ignoring: %s", xattr);
continue;
}
if (isempty(name) || isempty(value)) {
log_warning("Malformed extended attribute found, ignoring: %s", xattr);
continue;
}
if (strv_push_pair(&i->xattrs, name, value) < 0)
return log_oom();
name = value = NULL;
}
return 0;
}
static int fd_set_xattrs(Item *i, int fd, const char *path, const struct stat *st) {
char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
char **name, **value;
assert(i);
assert(fd >= 0);
assert(path);
xsprintf(procfs_path, "/proc/self/fd/%i", fd);
STRV_FOREACH_PAIR(name, value, i->xattrs) {
log_debug("Setting extended attribute '%s=%s' on %s.", *name, *value, path);
if (setxattr(procfs_path, *name, *value, strlen(*value), 0) < 0)
return log_error_errno(errno, "Setting extended attribute %s=%s on %s failed: %m",
*name, *value, path);
}
return 0;
}
static int path_set_xattrs(Item *i, const char *path) {
_cleanup_close_ int fd = -1;
assert(i);
assert(path);
fd = path_open_safe(path);
if (fd < 0)
return fd;
return fd_set_xattrs(i, fd, path, NULL);
}
static int parse_acls_from_arg(Item *item) {
#if HAVE_ACL
int r;
assert(item);
/* If append_or_force (= modify) is set, we will not modify the acl
* afterwards, so the mask can be added now if necessary. */
r = parse_acl(item->argument, &item->acl_access, &item->acl_default, !item->append_or_force);
if (r < 0)
log_warning_errno(r, "Failed to parse ACL \"%s\": %m. Ignoring", item->argument);
#else
log_warning("ACLs are not supported. Ignoring.");
#endif
return 0;
}
#if HAVE_ACL
static int path_set_acl(const char *path, const char *pretty, acl_type_t type, acl_t acl, bool modify) {
_cleanup_(acl_free_charpp) char *t = NULL;
_cleanup_(acl_freep) acl_t dup = NULL;
int r;
/* Returns 0 for success, positive error if already warned,
* negative error otherwise. */
if (modify) {
r = acls_for_file(path, type, acl, &dup);
if (r < 0)
return r;
r = calc_acl_mask_if_needed(&dup);
if (r < 0)
return r;
} else {
dup = acl_dup(acl);
if (!dup)
return -errno;
/* the mask was already added earlier if needed */
}
r = add_base_acls_if_needed(&dup, path);
if (r < 0)
return r;
t = acl_to_any_text(dup, NULL, ',', TEXT_ABBREVIATE);
log_debug("Setting %s ACL %s on %s.",
type == ACL_TYPE_ACCESS ? "access" : "default",
strna(t), pretty);
r = acl_set_file(path, type, dup);
if (r < 0) {
if (ERRNO_IS_NOT_SUPPORTED(errno))
/* No error if filesystem doesn't support ACLs. Return negative. */
return -errno;
else
/* Return positive to indicate we already warned */
return -log_error_errno(errno,
"Setting %s ACL \"%s\" on %s failed: %m",
type == ACL_TYPE_ACCESS ? "access" : "default",
strna(t), pretty);
}
return 0;
}
#endif
static int fd_set_acls(Item *item, int fd, const char *path, const struct stat *st) {
int r = 0;
#if HAVE_ACL
char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
struct stat stbuf;
assert(item);
assert(fd >= 0);
assert(path);
if (!st) {
if (fstat(fd, &stbuf) < 0)
return log_error_errno(errno, "fstat(%s) failed: %m", path);
st = &stbuf;
}
if (hardlink_vulnerable(st))
return log_error_errno(SYNTHETIC_ERRNO(EPERM),
"Refusing to set ACLs on hardlinked file %s while the fs.protected_hardlinks sysctl is turned off.",
path);
if (S_ISLNK(st->st_mode)) {
log_debug("Skipping ACL fix for symlink %s.", path);
return 0;
}
xsprintf(procfs_path, "/proc/self/fd/%i", fd);
if (item->acl_access)
r = path_set_acl(procfs_path, path, ACL_TYPE_ACCESS, item->acl_access, item->append_or_force);
/* set only default acls to folders */
if (r == 0 && item->acl_default && S_ISDIR(st->st_mode))
r = path_set_acl(procfs_path, path, ACL_TYPE_DEFAULT, item->acl_default, item->append_or_force);
if (ERRNO_IS_NOT_SUPPORTED(r)) {
log_debug_errno(r, "ACLs not supported by file system at %s", path);
return 0;
}
if (r > 0)
return -r; /* already warned */
/* The above procfs paths don't work if /proc is not mounted. */
if (r == -ENOENT && proc_mounted() == 0)
r = -ENOSYS;
if (r < 0)
return log_error_errno(r, "ACL operation on \"%s\" failed: %m", path);
#endif
return r;
}
static int path_set_acls(Item *item, const char *path) {
int r = 0;
#if HAVE_ACL
_cleanup_close_ int fd = -1;
assert(item);
assert(path);
fd = path_open_safe(path);
if (fd < 0)
return fd;
r = fd_set_acls(item, fd, path, NULL);
#endif
return r;
}
static int parse_attribute_from_arg(Item *item) {
static const struct {
char character;
unsigned value;
} attributes[] = {
{ 'A', FS_NOATIME_FL }, /* do not update atime */
{ 'S', FS_SYNC_FL }, /* Synchronous updates */
{ 'D', FS_DIRSYNC_FL }, /* dirsync behaviour (directories only) */
{ 'a', FS_APPEND_FL }, /* writes to file may only append */
{ 'c', FS_COMPR_FL }, /* Compress file */
{ 'd', FS_NODUMP_FL }, /* do not dump file */
{ 'e', FS_EXTENT_FL }, /* Extents */
{ 'i', FS_IMMUTABLE_FL }, /* Immutable file */
{ 'j', FS_JOURNAL_DATA_FL }, /* Reserved for ext3 */
{ 's', FS_SECRM_FL }, /* Secure deletion */
{ 'u', FS_UNRM_FL }, /* Undelete */
{ 't', FS_NOTAIL_FL }, /* file tail should not be merged */
{ 'T', FS_TOPDIR_FL }, /* Top of directory hierarchies */
{ 'C', FS_NOCOW_FL }, /* Do not cow file */
{ 'P', FS_PROJINHERIT_FL }, /* Inherit the quota project ID */
};
enum {
MODE_ADD,
MODE_DEL,
MODE_SET
} mode = MODE_ADD;
unsigned value = 0, mask = 0;
const char *p;
assert(item);
p = item->argument;
if (p) {
if (*p == '+') {
mode = MODE_ADD;
p++;
} else if (*p == '-') {
mode = MODE_DEL;
p++;
} else if (*p == '=') {
mode = MODE_SET;
p++;
}
}
if (isempty(p) && mode != MODE_SET)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Setting file attribute on '%s' needs an attribute specification.",
item->path);
for (; p && *p ; p++) {
unsigned i, v;
for (i = 0; i < ELEMENTSOF(attributes); i++)
if (*p == attributes[i].character)
break;
if (i >= ELEMENTSOF(attributes))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Unknown file attribute '%c' on '%s'.",
*p, item->path);
v = attributes[i].value;
SET_FLAG(value, v, IN_SET(mode, MODE_ADD, MODE_SET));
mask |= v;
}
if (mode == MODE_SET)
mask |= CHATTR_ALL_FL;
assert(mask != 0);
item->attribute_mask = mask;
item->attribute_value = value;
item->attribute_set = true;
return 0;
}
static int fd_set_attribute(Item *item, int fd, const char *path, const struct stat *st) {
_cleanup_close_ int procfs_fd = -1;
struct stat stbuf;
unsigned f;
int r;
assert(item);
assert(fd >= 0);
assert(path);
if (!item->attribute_set || item->attribute_mask == 0)
return 0;
if (!st) {
if (fstat(fd, &stbuf) < 0)
return log_error_errno(errno, "fstat(%s) failed: %m", path);
st = &stbuf;
}
/* Issuing the file attribute ioctls on device nodes is not
* safe, as that will be delivered to the drivers, not the
* file system containing the device node. */
if (!S_ISREG(st->st_mode) && !S_ISDIR(st->st_mode))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Setting file flags is only supported on regular files and directories, cannot set on '%s'.",
path);
f = item->attribute_value & item->attribute_mask;
/* Mask away directory-specific flags */
if (!S_ISDIR(st->st_mode))
f &= ~FS_DIRSYNC_FL;
procfs_fd = fd_reopen(fd, O_RDONLY|O_CLOEXEC|O_NOATIME);
if (procfs_fd < 0)
return log_error_errno(procfs_fd, "Failed to re-open '%s': %m", path);
unsigned previous, current;
r = chattr_full(NULL, procfs_fd, f, item->attribute_mask, &previous, &current, true);
if (r == -ENOANO)
log_warning("Cannot set file attributes for '%s', maybe due to incompatibility in specified attributes, "
"previous=0x%08x, current=0x%08x, expected=0x%08x, ignoring.",
path, previous, current, (previous & ~item->attribute_mask) | (f & item->attribute_mask));
else if (r < 0)
log_full_errno(ERRNO_IS_NOT_SUPPORTED(r) ? LOG_DEBUG : LOG_WARNING, r,
"Cannot set file attributes for '%s', value=0x%08x, mask=0x%08x, ignoring: %m",
path, item->attribute_value, item->attribute_mask);
return 0;
}
static int path_set_attribute(Item *item, const char *path) {
_cleanup_close_ int fd = -1;
if (!item->attribute_set || item->attribute_mask == 0)
return 0;
fd = path_open_safe(path);
if (fd < 0)
return fd;
return fd_set_attribute(item, fd, path, NULL);
}
static int write_one_file(Item *i, const char *path) {
_cleanup_close_ int fd = -1, dir_fd = -1;
char *bn;
int r;
assert(i);
assert(path);
assert(i->argument);
assert(i->type == WRITE_FILE);
/* Validate the path and keep the fd on the directory for opening the
* file so we're sure that it can't be changed behind our back. */
dir_fd = path_open_parent_safe(path);
if (dir_fd < 0)
return dir_fd;
bn = basename(path);
/* Follows symlinks */
fd = openat(dir_fd, bn,
O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY|(i->append_or_force ? O_APPEND : 0),
i->mode);
if (fd < 0) {
if (errno == ENOENT) {
log_debug_errno(errno, "Not writing missing file \"%s\": %m", path);
return 0;
}
if (i->allow_failure)
return log_debug_errno(errno, "Failed to open file \"%s\", ignoring: %m", path);
return log_error_errno(errno, "Failed to open file \"%s\": %m", path);
}
/* 'w' is allowed to write into any kind of files. */
log_debug("Writing to \"%s\".", path);
r = loop_write(fd, i->argument, strlen(i->argument), false);
if (r < 0)
return log_error_errno(r, "Failed to write file \"%s\": %m", path);
return fd_set_perms(i, fd, path, NULL);
}
static int create_file(Item *i, const char *path) {
_cleanup_close_ int fd = -1, dir_fd = -1;
struct stat stbuf, *st = NULL;
int r = 0;
char *bn;
assert(i);
assert(path);
assert(i->type == CREATE_FILE);
/* 'f' operates on regular files exclusively. */
/* Validate the path and keep the fd on the directory for opening the
* file so we're sure that it can't be changed behind our back. */
dir_fd = path_open_parent_safe(path);
if (dir_fd < 0)
return dir_fd;
bn = basename(path);
RUN_WITH_UMASK(0000) {
mac_selinux_create_file_prepare(path, S_IFREG);
fd = openat(dir_fd, bn, O_CREAT|O_EXCL|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
mac_selinux_create_file_clear();
}
if (fd < 0) {
/* Even on a read-only filesystem, open(2) returns EEXIST if the
* file already exists. It returns EROFS only if it needs to
* create the file. */
if (errno != EEXIST)
return log_error_errno(errno, "Failed to create file %s: %m", path);
/* Re-open the file. At that point it must exist since open(2)
* failed with EEXIST. We still need to check if the perms/mode
* need to be changed. For read-only filesystems, we let
* fd_set_perms() report the error if the perms need to be
* modified. */
fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
if (fd < 0)
return log_error_errno(errno, "Failed to re-open file %s: %m", path);
if (fstat(fd, &stbuf) < 0)
return log_error_errno(errno, "stat(%s) failed: %m", path);
if (!S_ISREG(stbuf.st_mode))
return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
"%s exists and is not a regular file.",
path);
st = &stbuf;
} else {
log_debug("\"%s\" has been created.", path);
if (i->argument) {
log_debug("Writing to \"%s\".", path);
r = loop_write(fd, i->argument, strlen(i->argument), false);
if (r < 0)
return log_error_errno(r, "Failed to write file \"%s\": %m", path);
}
}
return fd_set_perms(i, fd, path, st);
}
static int truncate_file(Item *i, const char *path) {
_cleanup_close_ int fd = -1, dir_fd = -1;
struct stat stbuf, *st = NULL;
bool erofs = false;
int r = 0;
char *bn;
assert(i);
assert(path);
assert(i->type == TRUNCATE_FILE || (i->type == CREATE_FILE && i->append_or_force));
/* We want to operate on regular file exclusively especially since
* O_TRUNC is unspecified if the file is neither a regular file nor a
* fifo nor a terminal device. Therefore we first open the file and make
* sure it's a regular one before truncating it. */
/* Validate the path and keep the fd on the directory for opening the
* file so we're sure that it can't be changed behind our back. */
dir_fd = path_open_parent_safe(path);
if (dir_fd < 0)
return dir_fd;
bn = basename(path);
RUN_WITH_UMASK(0000) {
mac_selinux_create_file_prepare(path, S_IFREG);
fd = openat(dir_fd, bn, O_CREAT|O_NOFOLLOW|O_NONBLOCK|O_CLOEXEC|O_WRONLY|O_NOCTTY, i->mode);
mac_selinux_create_file_clear();
}
if (fd < 0) {
if (errno != EROFS)
return log_error_errno(errno, "Failed to open/create file %s: %m", path);
/* On a read-only filesystem, we don't want to fail if the
* target is already empty and the perms are set. So we still
* proceed with the sanity checks and let the remaining
* operations fail with EROFS if they try to modify the target
* file. */
fd = openat(dir_fd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH, i->mode);
if (fd < 0) {
if (errno == ENOENT)
return log_error_errno(SYNTHETIC_ERRNO(EROFS),
"Cannot create file %s on a read-only file system.",
path);
return log_error_errno(errno, "Failed to re-open file %s: %m", path);
}
erofs = true;
}
if (fstat(fd, &stbuf) < 0)
return log_error_errno(errno, "stat(%s) failed: %m", path);
if (!S_ISREG(stbuf.st_mode))
return log_error_errno(SYNTHETIC_ERRNO(EEXIST),
"%s exists and is not a regular file.",
path);
if (stbuf.st_size > 0) {
if (ftruncate(fd, 0) < 0) {
r = erofs ? -EROFS : -errno;
return log_error_errno(r, "Failed to truncate file %s: %m", path);
}
} else
st = &stbuf;
log_debug("\"%s\" has been created.", path);
if (i->argument) {
log_debug("Writing to \"%s\".", path);
r = loop_write(fd, i->argument, strlen(i->argument), false);
if (r < 0) {
r = erofs ? -EROFS : r;
return log_error_errno(r, "Failed to write file %s: %m", path);
}
}
return fd_set_perms(i, fd, path, st);
}
static int copy_files(Item *i) {
_cleanup_close_ int dfd = -1, fd = -1;
char *bn;
int r;
log_debug("Copying tree \"%s\" to \"%s\".", i->argument, i->path);
bn = basename(i->path);
/* Validate the path and use the returned directory fd for copying the
* target so we're sure that the path can't be changed behind our
* back. */
dfd = path_open_parent_safe(i->path);
if (dfd < 0)
return dfd;
r = copy_tree_at(AT_FDCWD, i->argument,
dfd, bn,
i->uid_set ? i->uid : UID_INVALID,
i->gid_set ? i->gid : GID_INVALID,
COPY_REFLINK | COPY_MERGE_EMPTY | COPY_MAC_CREATE | COPY_HARDLINKS);
if (r < 0) {
struct stat a, b;
/* If the target already exists on read-only filesystems, trying
* to create the target will not fail with EEXIST but with
* EROFS. */
if (r == -EROFS && faccessat(dfd, bn, F_OK, AT_SYMLINK_NOFOLLOW) == 0)
r = -EEXIST;
if (r != -EEXIST)
return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
if (stat(i->argument, &a) < 0)
return log_error_errno(errno, "stat(%s) failed: %m", i->argument);
if (fstatat(dfd, bn, &b, AT_SYMLINK_NOFOLLOW) < 0)
return log_error_errno(errno, "stat(%s) failed: %m", i->path);
if ((a.st_mode ^ b.st_mode) & S_IFMT) {
log_debug("Can't copy to %s, file exists already and is of different type", i->path);
return 0;
}
}
fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
if (fd < 0)
return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
return fd_set_perms(i, fd, i->path, NULL);
}
typedef enum {
CREATION_NORMAL,
CREATION_EXISTING,
CREATION_FORCE,
_CREATION_MODE_MAX,
_CREATION_MODE_INVALID = -EINVAL,
} CreationMode;
static const char *const creation_mode_verb_table[_CREATION_MODE_MAX] = {
[CREATION_NORMAL] = "Created",
[CREATION_EXISTING] = "Found existing",
[CREATION_FORCE] = "Created replacement",
};
DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(creation_mode_verb, CreationMode);
static int create_directory_or_subvolume(const char *path, mode_t mode, bool subvol, CreationMode *creation) {
_cleanup_close_ int pfd = -1;
CreationMode c;
int r;
assert(path);
if (!creation)
creation = &c;
pfd = path_open_parent_safe(path);
if (pfd < 0)
return pfd;
if (subvol) {
r = getenv_bool("SYSTEMD_TMPFILES_FORCE_SUBVOL");
if (r < 0) {
if (r != -ENXIO) /* env var is unset */
log_warning_errno(r, "Cannot parse value of $SYSTEMD_TMPFILES_FORCE_SUBVOL, ignoring.");
r = btrfs_is_subvol(empty_to_root(arg_root)) > 0;
}
if (!r)
/* Don't create a subvolume unless the root directory is
* one, too. We do this under the assumption that if the
* root directory is just a plain directory (i.e. very
* light-weight), we shouldn't try to split it up into
* subvolumes (i.e. more heavy-weight). Thus, chroot()
* environments and suchlike will get a full brtfs
* subvolume set up below their tree only if they
* specifically set up a btrfs subvolume for the root
* dir too. */
subvol = false;
else {
RUN_WITH_UMASK((~mode) & 0777)
r = btrfs_subvol_make_fd(pfd, basename(path));
}
} else
r = 0;
if (!subvol || r == -ENOTTY)
RUN_WITH_UMASK(0000)
r = mkdirat_label(pfd, basename(path), mode);
if (r < 0) {
int k;
if (!IN_SET(r, -EEXIST, -EROFS))
return log_error_errno(r, "Failed to create directory or subvolume \"%s\": %m", path);
k = is_dir_fd(pfd);
if (k == -ENOENT && r == -EROFS)
return log_error_errno(r, "%s does not exist and cannot be created as the file system is read-only.", path);
if (k < 0)
return log_error_errno(k, "Failed to check if %s exists: %m", path);
if (!k)
return log_warning_errno(SYNTHETIC_ERRNO(EEXIST),
"\"%s\" already exists and is not a directory.", path);
*creation = CREATION_EXISTING;
} else
*creation = CREATION_NORMAL;
log_debug("%s directory \"%s\".", creation_mode_verb_to_string(*creation), path);
r = openat(pfd, basename(path), O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
if (r < 0)
return log_error_errno(errno, "Failed to open directory '%s': %m", basename(path));
return r;
}
static int create_directory(Item *i, const char *path) {
_cleanup_close_ int fd = -1;
assert(i);
assert(IN_SET(i->type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY));
fd = create_directory_or_subvolume(path, i->mode, false, NULL);
if (fd == -EEXIST)
return 0;
if (fd < 0)
return fd;
return fd_set_perms(i, fd, path, NULL);
}
static int create_subvolume(Item *i, const char *path) {
_cleanup_close_ int fd = -1;
CreationMode creation;
int r, q = 0;
assert(i);
assert(IN_SET(i->type, CREATE_SUBVOLUME, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA));
fd = create_directory_or_subvolume(path, i->mode, true, &creation);
if (fd == -EEXIST)
return 0;
if (fd < 0)
return fd;
if (creation == CREATION_NORMAL &&
IN_SET(i->type, CREATE_SUBVOLUME_NEW_QUOTA, CREATE_SUBVOLUME_INHERIT_QUOTA)) {
r = btrfs_subvol_auto_qgroup_fd(fd, 0, i->type == CREATE_SUBVOLUME_NEW_QUOTA);
if (r == -ENOTTY)
log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (unsupported fs or dir not a subvolume): %m", i->path);
else if (r == -EROFS)
log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (fs is read-only).", i->path);
else if (r == -ENOTCONN)
log_debug_errno(r, "Couldn't adjust quota for subvolume \"%s\" (quota support is disabled).", i->path);
else if (r < 0)
q = log_error_errno(r, "Failed to adjust quota for subvolume \"%s\": %m", i->path);
else if (r > 0)
log_debug("Adjusted quota for subvolume \"%s\".", i->path);
else if (r == 0)
log_debug("Quota for subvolume \"%s\" already in place, no change made.", i->path);
}
r = fd_set_perms(i, fd, path, NULL);
if (q < 0) /* prefer the quota change error from above */
return q;
return r;
}
static int empty_directory(Item *i, const char *path) {
int r;
assert(i);
assert(i->type == EMPTY_DIRECTORY);
r = is_dir(path, false);
if (r == -ENOENT) {
/* Option "e" operates only on existing objects. Do not
* print errors about non-existent files or directories */
log_debug("Skipping missing directory: %s", path);
return 0;
}
if (r < 0)
return log_error_errno(r, "is_dir() failed on path %s: %m", path);
if (r == 0) {
log_warning("\"%s\" already exists and is not a directory.", path);
return 0;
}
return path_set_perms(i, path);
}
static int create_device(Item *i, mode_t file_type) {
_cleanup_close_ int dfd = -1, fd = -1;
CreationMode creation;
char *bn;
int r;
assert(i);
assert(IN_SET(file_type, S_IFBLK, S_IFCHR));
bn = basename(i->path);
/* Validate the path and use the returned directory fd for copying the
* target so we're sure that the path can't be changed behind our
* back. */
dfd = path_open_parent_safe(i->path);
if (dfd < 0)
return dfd;
RUN_WITH_UMASK(0000) {
mac_selinux_create_file_prepare(i->path, file_type);
r = mknodat(dfd, bn, i->mode | file_type, i->major_minor);
mac_selinux_create_file_clear();
}
if (r < 0) {
struct stat st;
if (errno == EPERM) {
log_debug("We lack permissions, possibly because of cgroup configuration; "
"skipping creation of device node %s.", i->path);
return 0;
}
if (errno != EEXIST)
return log_error_errno(errno, "Failed to create device node %s: %m", i->path);
if (fstatat(dfd, bn, &st, 0) < 0)
return log_error_errno(errno, "stat(%s) failed: %m", i->path);
if ((st.st_mode & S_IFMT) != file_type) {
if (i->append_or_force) {
RUN_WITH_UMASK(0000) {
mac_selinux_create_file_prepare(i->path, file_type);
/* FIXME: need to introduce mknodat_atomic() */
r = mknod_atomic(i->path, i->mode | file_type, i->major_minor);
mac_selinux_create_file_clear();
}
if (r < 0)
return log_error_errno(r, "Failed to create device node \"%s\": %m", i->path);
creation = CREATION_FORCE;
} else {
log_warning("\"%s\" already exists is not a device node.", i->path);
return 0;
}
} else
creation = CREATION_EXISTING;
} else
creation = CREATION_NORMAL;
log_debug("%s %s device node \"%s\" %u:%u.",
creation_mode_verb_to_string(creation),
i->type == CREATE_BLOCK_DEVICE ? "block" : "char",
i->path, major(i->mode), minor(i->mode));
fd = openat(dfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
if (fd < 0)
return log_error_errno(errno, "Failed to openat(%s): %m", i->path);
return fd_set_perms(i, fd, i->path, NULL);
}
static int create_fifo(Item *i, const char *path) {
_cleanup_close_ int pfd = -1, fd = -1;
CreationMode creation;
struct stat st;
char *bn;
int r;
pfd = path_open_parent_safe(path);
if (pfd < 0)
return pfd;
bn = basename(path);
RUN_WITH_UMASK(0000) {
mac_selinux_create_file_prepare(path, S_IFIFO);
r = mkfifoat(pfd, bn, i->mode);
mac_selinux_create_file_clear();
}
if (r < 0) {
if (errno != EEXIST)
return log_error_errno(errno, "Failed to create fifo %s: %m", path);
if (fstatat(pfd, bn, &st, AT_SYMLINK_NOFOLLOW) < 0)
return log_error_errno(errno, "stat(%s) failed: %m", path);
if (!S_ISFIFO(st.st_mode)) {
if (i->append_or_force) {
RUN_WITH_UMASK(0000) {
mac_selinux_create_file_prepare(path, S_IFIFO);
r = mkfifoat_atomic(pfd, bn, i->mode);
mac_selinux_create_file_clear();
}
if (r < 0)
return log_error_errno(r, "Failed to create fifo %s: %m", path);
creation = CREATION_FORCE;
} else {
log_warning("\"%s\" already exists and is not a fifo.", path);
return 0;
}
} else
creation = CREATION_EXISTING;
} else
creation = CREATION_NORMAL;
log_debug("%s fifo \"%s\".", creation_mode_verb_to_string(creation), path);
fd = openat(pfd, bn, O_NOFOLLOW|O_CLOEXEC|O_PATH);
if (fd < 0)
return log_error_errno(errno, "Failed to openat(%s): %m", path);
return fd_set_perms(i, fd, i->path, NULL);
}
typedef int (*action_t)(Item *i, const char *path);
typedef int (*fdaction_t)(Item *i, int fd, const char *path, const struct stat *st);
static int item_do(Item *i, int fd, const char *path, fdaction_t action) {
struct stat st;
int r = 0, q;
assert(i);
assert(path);
assert(fd >= 0);
if (fstat(fd, &st) < 0) {
r = log_error_errno(errno, "fstat() on file failed: %m");
goto finish;
}
/* This returns the first error we run into, but nevertheless
* tries to go on */
r = action(i, fd, path, &st);
if (S_ISDIR(st.st_mode)) {
char procfs_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(int)];
_cleanup_closedir_ DIR *d = NULL;
struct dirent *de;
/* The passed 'fd' was opened with O_PATH. We need to convert
* it into a 'regular' fd before reading the directory content. */
xsprintf(procfs_path, "/proc/self/fd/%i", fd);
d = opendir(procfs_path);
if (!d) {
log_error_errno(errno, "Failed to opendir() '%s': %m", procfs_path);
if (r == 0)
r = -errno;
goto finish;
}
FOREACH_DIRENT_ALL(de, d, q = -errno; goto finish) {
int de_fd;
if (dot_or_dot_dot(de->d_name))
continue;
de_fd = openat(fd, de->d_name, O_NOFOLLOW|O_CLOEXEC|O_PATH);
if (de_fd < 0)
q = log_error_errno(errno, "Failed to open() file '%s': %m", de->d_name);
else {
_cleanup_free_ char *de_path = NULL;
de_path = path_join(path, de->d_name);
if (!de_path)
q = log_oom();
else
/* Pass ownership of dirent fd over */
q = item_do(i, de_fd, de_path, action);
}
if (q < 0 && r == 0)
r = q;
}
}
finish:
safe_close(fd);
return r;
}
static int glob_item(Item *i, action_t action) {
_cleanup_globfree_ glob_t g = {
.gl_opendir = (void *(*)(const char *)) opendir_nomod,
};
int r = 0, k;
char **fn;
k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
if (k < 0 && k != -ENOENT)
return log_error_errno(k, "glob(%s) failed: %m", i->path);
STRV_FOREACH(fn, g.gl_pathv) {
k = action(i, *fn);
if (k < 0 && r == 0)
r = k;
}
return r;
}
static int glob_item_recursively(Item *i, fdaction_t action) {
_cleanup_globfree_ glob_t g = {
.gl_opendir = (void *(*)(const char *)) opendir_nomod,
};
int r = 0, k;
char **fn;
k = safe_glob(i->path, GLOB_NOSORT|GLOB_BRACE, &g);
if (k < 0 && k != -ENOENT)
return log_error_errno(k, "glob(%s) failed: %m", i->path);
STRV_FOREACH(fn, g.gl_pathv) {
_cleanup_close_ int fd = -1;
/* Make sure we won't trigger/follow file object (such as
* device nodes, automounts, ...) pointed out by 'fn' with
* O_PATH. Note, when O_PATH is used, flags other than
* O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW are ignored. */
fd = open(*fn, O_CLOEXEC|O_NOFOLLOW|O_PATH);
if (fd < 0) {
log_error_errno(errno, "Opening '%s' failed: %m", *fn);
if (r == 0)
r = -errno;
continue;
}
k = item_do(i, fd, *fn, action);
if (k < 0 && r == 0)
r = k;
/* we passed fd ownership to the previous call */
fd = -1;
}
return r;
}
static int rm_if_wrong_type_safe(
mode_t mode,
int parent_fd,
const struct stat *parent_st, /* Only used if follow_links below is true. */
const char *name,
int flags) {
_cleanup_free_ char *parent_name = NULL;
bool follow_links = !FLAGS_SET(flags, AT_SYMLINK_NOFOLLOW);
struct stat st;
int r;
assert(name);
assert((mode & ~S_IFMT) == 0);
assert(!follow_links || parent_st);
assert((flags & ~AT_SYMLINK_NOFOLLOW) == 0);
if (!filename_is_valid(name))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "\"%s\" is not a valid filename.", name);
r = fstatat_harder(parent_fd, name, &st, flags, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
if (r < 0) {
(void) fd_get_path(parent_fd, &parent_name);
return log_full_errno(r == -ENOENT? LOG_DEBUG : LOG_ERR, r,
"Failed to stat \"%s\" at \"%s\": %m", name, strna(parent_name));
}
/* Fail before removing anything if this is an unsafe transition. */
if (follow_links && unsafe_transition(parent_st, &st)) {
(void) fd_get_path(parent_fd, &parent_name);
return log_error_errno(SYNTHETIC_ERRNO(ENOLINK),
"Unsafe transition from \"%s\" to \"%s\".", parent_name, name);
}
if ((st.st_mode & S_IFMT) == mode)
return 0;
(void) fd_get_path(parent_fd, &parent_name);
log_notice("Wrong file type 0x%x; rm -rf \"%s/%s\"", st.st_mode & S_IFMT, strna(parent_name), name);
/* If the target of the symlink was the wrong type, the link needs to be removed instead of the
* target, so make sure it is identified as a link and not a directory. */
if (follow_links) {
r = fstatat_harder(parent_fd, name, &st, AT_SYMLINK_NOFOLLOW, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
if (r < 0)
return log_error_errno(r, "Failed to stat \"%s\" at \"%s\": %m", name, strna(parent_name));
}
/* Do not remove mount points. */
r = fd_is_mount_point(parent_fd, name, follow_links ? AT_SYMLINK_FOLLOW : 0);
if (r < 0)
(void) log_warning_errno(r, "Failed to check if \"%s/%s\" is a mount point: %m; Continuing",
strna(parent_name), name);
else if (r > 0)
return log_error_errno(SYNTHETIC_ERRNO(EBUSY),
"Not removing \"%s/%s\" because it is a mount point.", strna(parent_name), name);
if ((st.st_mode & S_IFMT) == S_IFDIR) {
_cleanup_close_ int child_fd = -1;
child_fd = openat(parent_fd, name, O_NOCTTY | O_CLOEXEC | O_DIRECTORY);
if (child_fd < 0)
return log_error_errno(errno, "Failed to open \"%s\" at \"%s\": %m", name, strna(parent_name));
r = rm_rf_children(TAKE_FD(child_fd), REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL, &st);
if (r < 0)
return log_error_errno(r, "Failed to remove contents of \"%s\" at \"%s\": %m", name, strna(parent_name));
r = unlinkat_harder(parent_fd, name, AT_REMOVEDIR, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
} else
r = unlinkat_harder(parent_fd, name, 0, REMOVE_CHMOD | REMOVE_CHMOD_RESTORE);
if (r < 0)
return log_error_errno(r, "Failed to remove \"%s\" at \"%s\": %m", name, strna(parent_name));
/* This is covered by the log_notice "Wrong file type..." It is logged earlier because it gives
* context to other error messages that might follow. */
return -ENOENT;
}
/* If child_mode is non-zero, rm_if_wrong_type_safe will be executed for the last path component. */
static int mkdir_parents_rm_if_wrong_type(mode_t child_mode, const char *path) {
_cleanup_close_ int parent_fd = -1;
struct stat parent_st;
size_t path_len;
int r;
assert(path);
assert((child_mode & ~S_IFMT) == 0);
path_len = strlen(path);
if (!is_path(path))
/* rm_if_wrong_type_safe already logs errors. */
return child_mode != 0 ? rm_if_wrong_type_safe(child_mode, AT_FDCWD, NULL, path, AT_SYMLINK_NOFOLLOW) : 0;
if (child_mode != 0 && endswith(path, "/"))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Trailing path separators are only allowed if child_mode is not set; got \"%s\"", path);
/* Get the parent_fd and stat. */
parent_fd = openat(AT_FDCWD, path_is_absolute(path) ? "/" : ".", O_NOCTTY | O_CLOEXEC | O_DIRECTORY);
if (parent_fd < 0)
return log_error_errno(errno, "Failed to open root: %m");
if (fstat(parent_fd, &parent_st) < 0)
return log_error_errno(errno, "Failed to stat root: %m");
/* Check every parent directory in the path, except the last component */
for (const char *e = path;;) {
_cleanup_close_ int next_fd = -1;
char t[path_len + 1];
const char *s;
/* Find the start of the next path component. */
s = e + strspn(e, "/");
/* Find the end of the next path component. */
e = s + strcspn(s, "/");
/* Copy the path component to t so it can be a null terminated string. */
*((char*) mempcpy(t, s, e - s)) = 0;
/* Is this the last component? If so, then check the type */
if (*e == 0)
return child_mode != 0 ? rm_if_wrong_type_safe(child_mode, parent_fd, &parent_st, t, AT_SYMLINK_NOFOLLOW) : 0;
r = rm_if_wrong_type_safe(S_IFDIR, parent_fd, &parent_st, t, 0);
/* Remove dangling symlinks. */
if (r == -ENOENT)
r = rm_if_wrong_type_safe(S_IFDIR, parent_fd, &parent_st, t, AT_SYMLINK_NOFOLLOW);
if (r == -ENOENT) {
RUN_WITH_UMASK(0000)
r = mkdirat_label(parent_fd, t, 0755);
if (r < 0) {
_cleanup_free_ char *parent_name = NULL;
(void) fd_get_path(parent_fd, &parent_name);
return log_error_errno(r, "Failed to mkdir \"%s\" at \"%s\": %m", t, strnull(parent_name));
}
} else if (r < 0)
/* rm_if_wrong_type_safe already logs errors. */
return r;
next_fd = openat(parent_fd, t, O_NOCTTY | O_CLOEXEC | O_DIRECTORY);
if (next_fd < 0) {
_cleanup_free_ char *parent_name = NULL;
r = -errno;
(void) fd_get_path(parent_fd, &parent_name);
return log_error_errno(r, "Failed to open \"%s\" at \"%s\": %m", t, strnull(parent_name));
}
if (fstat(next_fd, &parent_st) < 0) {
_cleanup_free_ char *parent_name = NULL;
r = -errno;
(void) fd_get_path(parent_fd, &parent_name);
return log_error_errno(r, "Failed to stat \"%s\" at \"%s\": %m", t, strnull(parent_name));
}
CLOSE_AND_REPLACE(parent_fd, next_fd);
}
}
static int mkdir_parents_item(Item *i, mode_t child_mode) {
int r;
if (i->try_replace) {
r = mkdir_parents_rm_if_wrong_type(child_mode, i->path);
if (r < 0 && r != -ENOENT)
return r;
} else
RUN_WITH_UMASK(0000)
(void) mkdir_parents_label(i->path, 0755);
return 0;
}
static int create_item(Item *i) {
CreationMode creation;
int r = 0;
assert(i);
log_debug("Running create action for entry %c %s", (char) i->type, i->path);
switch (i->type) {
case IGNORE_PATH:
case IGNORE_DIRECTORY_PATH:
case REMOVE_PATH:
case RECURSIVE_REMOVE_PATH:
return 0;
case TRUNCATE_FILE:
case CREATE_FILE:
r = mkdir_parents_item(i, S_IFREG);
if (r < 0)
return r;
if ((i->type == CREATE_FILE && i->append_or_force) || i->type == TRUNCATE_FILE)
r = truncate_file(i, i->path);
else
r = create_file(i, i->path);
if (r < 0)
return r;
break;
case COPY_FILES:
r = mkdir_parents_item(i, 0);
if (r < 0)
return r;
r = copy_files(i);
if (r < 0)
return r;
break;
case WRITE_FILE:
r = glob_item(i, write_one_file);
if (r < 0)
return r;
break;
case CREATE_DIRECTORY:
case TRUNCATE_DIRECTORY:
r = mkdir_parents_item(i, S_IFDIR);
if (r < 0)
return r;
r = create_directory(i, i->path);
if (r < 0)
return r;
break;
case CREATE_SUBVOLUME:
case CREATE_SUBVOLUME_INHERIT_QUOTA:
case CREATE_SUBVOLUME_NEW_QUOTA:
r = mkdir_parents_item(i, S_IFDIR);
if (r < 0)
return r;
r = create_subvolume(i, i->path);
if (r < 0)
return r;
break;
case EMPTY_DIRECTORY:
r = glob_item(i, empty_directory);
if (r < 0)
return r;
break;
case CREATE_FIFO:
r = mkdir_parents_item(i, S_IFIFO);
if (r < 0)
return r;
r = create_fifo(i, i->path);
if (r < 0)
return r;
break;
case CREATE_SYMLINK: {
r = mkdir_parents_item(i, S_IFLNK);
if (r < 0)
return r;
mac_selinux_create_file_prepare(i->path, S_IFLNK);
r = symlink(i->argument, i->path);
mac_selinux_create_file_clear();
if (r < 0) {
_cleanup_free_ char *x = NULL;
if (errno != EEXIST)
return log_error_errno(errno, "symlink(%s, %s) failed: %m", i->argument, i->path);
r = readlink_malloc(i->path, &x);
if (r < 0 || !streq(i->argument, x)) {
if (i->append_or_force) {
mac_selinux_create_file_prepare(i->path, S_IFLNK);
r = symlink_atomic(i->argument, i->path);
mac_selinux_create_file_clear();
if (IN_SET(r, -EISDIR, -EEXIST, -ENOTEMPTY)) {
r = rm_rf(i->path, REMOVE_ROOT|REMOVE_PHYSICAL);
if (r < 0)
return log_error_errno(r, "rm -fr %s failed: %m", i->path);
mac_selinux_create_file_prepare(i->path, S_IFLNK);
r = symlink(i->argument, i->path) < 0 ? -errno : 0;
mac_selinux_create_file_clear();
}
if (r < 0)
return log_error_errno(r, "symlink(%s, %s) failed: %m", i->argument, i->path);
creation = CREATION_FORCE;
} else {
log_debug("\"%s\" is not a symlink or does not point to the correct path.", i->path);
return 0;
}
} else
creation = CREATION_EXISTING;
} else
creation = CREATION_NORMAL;
log_debug("%s symlink \"%s\".", creation_mode_verb_to_string(creation), i->path);
break;
}
case CREATE_BLOCK_DEVICE:
case CREATE_CHAR_DEVICE:
if (have_effective_cap(CAP_MKNOD) == 0) {
/* In a container we lack CAP_MKNOD. We shouldn't attempt to create the device node in that
* case to avoid noise, and we don't support virtualized devices in containers anyway. */
log_debug("We lack CAP_MKNOD, skipping creation of device node %s.", i->path);
return 0;
}
r = mkdir_parents_item(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
if (r < 0)
return r;
r = create_device(i, i->type == CREATE_BLOCK_DEVICE ? S_IFBLK : S_IFCHR);
if (r < 0)
return r;
break;
case ADJUST_MODE:
case RELABEL_PATH:
r = glob_item(i, path_set_perms);
if (r < 0)
return r;
break;
case RECURSIVE_RELABEL_PATH:
r = glob_item_recursively(i, fd_set_perms);
if (r < 0)
return r;
break;
case SET_XATTR:
r = glob_item(i, path_set_xattrs);
if (r < 0)
return r;
break;
case RECURSIVE_SET_XATTR:
r = glob_item_recursively(i, fd_set_xattrs);
if (r < 0)
return r;
break;
case SET_ACL:
r = glob_item(i, path_set_acls);
if (r < 0)
return r;
break;
case RECURSIVE_SET_ACL:
r = glob_item_recursively(i, fd_set_acls);
if (r < 0)
return r;
break;
case SET_ATTRIBUTE:
r = glob_item(i, path_set_attribute);
if (r < 0)
return r;
break;
case RECURSIVE_SET_ATTRIBUTE:
r = glob_item_recursively(i, fd_set_attribute);
if (r < 0)
return r;
break;
}
return 0;
}
static int remove_item_instance(Item *i, const char *instance) {
int r;
assert(i);
switch (i->type) {
case REMOVE_PATH:
if (remove(instance) < 0 && errno != ENOENT)
return log_error_errno(errno, "rm(%s): %m", instance);
break;
case RECURSIVE_REMOVE_PATH:
/* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
log_debug("rm -rf \"%s\"", instance);
r = rm_rf(instance, REMOVE_ROOT|REMOVE_SUBVOLUME|REMOVE_PHYSICAL);
if (r < 0 && r != -ENOENT)
return log_error_errno(r, "rm_rf(%s): %m", instance);
break;
default:
assert_not_reached("wut?");
}
return 0;
}
static int remove_item(Item *i) {
int r;
assert(i);
log_debug("Running remove action for entry %c %s", (char) i->type, i->path);
switch (i->type) {
case TRUNCATE_DIRECTORY:
/* FIXME: we probably should use dir_cleanup() here instead of rm_rf() so that 'x' is honoured. */
log_debug("rm -rf \"%s\"", i->path);
r = rm_rf(i->path, REMOVE_PHYSICAL);
if (r < 0 && r != -ENOENT)
return log_error_errno(r, "rm_rf(%s): %m", i->path);
return 0;
case REMOVE_PATH:
case RECURSIVE_REMOVE_PATH:
return glob_item(i, remove_item_instance);
default:
return 0;
}
}
static char *age_by_to_string(AgeBy ab, bool is_dir) {
static const char ab_map[] = { 'a', 'b', 'c', 'm' };
size_t j = 0;
char *ret;
ret = new(char, ELEMENTSOF(ab_map) + 1);
if (!ret)
return NULL;
for (size_t i = 0; i < ELEMENTSOF(ab_map); i++)
if (FLAGS_SET(ab, 1U << i))
ret[j++] = is_dir ? ascii_toupper(ab_map[i]) : ab_map[i];
ret[j] = 0;
return ret;
}
static int clean_item_instance(Item *i, const char* instance) {
char timestamp[FORMAT_TIMESTAMP_MAX];
_cleanup_closedir_ DIR *d = NULL;
STRUCT_STATX_DEFINE(sx);
int mountpoint, r;
usec_t cutoff, n;
assert(i);
if (!i->age_set)
return 0;
n = now(CLOCK_REALTIME);
if (n < i->age)
return 0;
cutoff = n - i->age;
d = opendir_nomod(instance);
if (!d) {
if (IN_SET(errno, ENOENT, ENOTDIR)) {
log_debug_errno(errno, "Directory \"%s\": %m", instance);
return 0;
}
return log_error_errno(errno, "Failed to open directory %s: %m", instance);
}
r = statx_fallback(dirfd(d), "", AT_EMPTY_PATH, STATX_MODE|STATX_INO|STATX_ATIME|STATX_MTIME, &sx);
if (r < 0)
return log_error_errno(r, "statx(%s) failed: %m", instance);
if (FLAGS_SET(sx.stx_attributes_mask, STATX_ATTR_MOUNT_ROOT))
mountpoint = FLAGS_SET(sx.stx_attributes, STATX_ATTR_MOUNT_ROOT);
else {
struct stat ps;
if (fstatat(dirfd(d), "..", &ps, AT_SYMLINK_NOFOLLOW) != 0)
return log_error_errno(errno, "stat(%s/..) failed: %m", i->path);
mountpoint =
sx.stx_dev_major != major(ps.st_dev) ||
sx.stx_dev_minor != minor(ps.st_dev) ||
sx.stx_ino != ps.st_ino;
}
if (DEBUG_LOGGING) {
_cleanup_free_ char *ab_f = NULL, *ab_d = NULL;
ab_f = age_by_to_string(i->age_by_file, false);
if (!ab_f)
return log_oom();
ab_d = age_by_to_string(i->age_by_dir, true);
if (!ab_d)
return log_oom();
log_debug("Cleanup threshold for %s \"%s\" is %s; age-by: %s%s",
mountpoint ? "mount point" : "directory",
instance,
format_timestamp_style(timestamp, sizeof(timestamp), cutoff, TIMESTAMP_US),
ab_f, ab_d);
}
return dir_cleanup(i, instance, d,
load_statx_timestamp_nsec(&sx.stx_atime),
load_statx_timestamp_nsec(&sx.stx_mtime),
cutoff * NSEC_PER_USEC,
sx.stx_dev_major, sx.stx_dev_minor, mountpoint,
MAX_DEPTH, i->keep_first_level,
i->age_by_file, i->age_by_dir);
}
static int clean_item(Item *i) {
assert(i);
log_debug("Running clean action for entry %c %s", (char) i->type, i->path);
switch (i->type) {
case CREATE_DIRECTORY:
case CREATE_SUBVOLUME:
case CREATE_SUBVOLUME_INHERIT_QUOTA:
case CREATE_SUBVOLUME_NEW_QUOTA:
case TRUNCATE_DIRECTORY:
case IGNORE_PATH:
case COPY_FILES:
clean_item_instance(i, i->path);
return 0;
case EMPTY_DIRECTORY:
case IGNORE_DIRECTORY_PATH:
return glob_item(i, clean_item_instance);
default:
return 0;
}
}
static int process_item(Item *i, OperationMask operation) {
OperationMask todo;
_cleanup_free_ char *_path = NULL;
const char *path;
int r, q, p;
assert(i);
todo = operation & ~i->done;
if (todo == 0) /* Everything already done? */
return 0;
i->done |= operation;
path = i->path;
if (string_is_glob(path)) {
/* We can't easily check whether a glob matches any autofs path, so let's do the check only
* for the non-glob part. */
r = glob_non_glob_prefix(path, &_path);
if (r < 0 && r != -ENOENT)
return log_debug_errno(r, "Failed to deglob path: %m");
if (r >= 0)
path = _path;
}
r = chase_symlinks(path, arg_root, CHASE_NO_AUTOFS|CHASE_NONEXISTENT|CHASE_WARN, NULL, NULL);
if (r == -EREMOTE) {
log_notice_errno(r, "Skipping %s", i->path); /* We log the configured path, to not confuse the user. */
return 0;
}
if (r < 0)
log_debug_errno(r, "Failed to determine whether '%s' is below autofs, ignoring: %m", i->path);
r = FLAGS_SET(operation, OPERATION_CREATE) ? create_item(i) : 0;
/* Failure can only be tolerated for create */
if (i->allow_failure)
r = 0;
q = FLAGS_SET(operation, OPERATION_REMOVE) ? remove_item(i) : 0;
p = FLAGS_SET(operation, OPERATION_CLEAN) ? clean_item(i) : 0;
return r < 0 ? r :
q < 0 ? q :
p;
}
static int process_item_array(ItemArray *array, OperationMask operation) {
int r = 0;
size_t n;
assert(array);
/* Create any parent first. */
if (FLAGS_SET(operation, OPERATION_CREATE) && array->parent)
r = process_item_array(array->parent, operation & OPERATION_CREATE);
/* Clean up all children first */
if ((operation & (OPERATION_REMOVE|OPERATION_CLEAN)) && !set_isempty(array->children)) {
ItemArray *c;
SET_FOREACH(c, array->children) {
int k;
k = process_item_array(c, operation & (OPERATION_REMOVE|OPERATION_CLEAN));
if (k < 0 && r == 0)
r = k;
}
}
for (n = 0; n < array->n_items; n++) {
int k;
k = process_item(array->items + n, operation);
if (k < 0 && r == 0)
r = k;
}
return r;
}
static void item_free_contents(Item *i) {
assert(i);
free(i->path);
free(i->argument);
strv_free(i->xattrs);
#if HAVE_ACL
acl_free(i->acl_access);
acl_free(i->acl_default);
#endif
}
static ItemArray* item_array_free(ItemArray *a) {
size_t n;
if (!a)
return NULL;
for (n = 0; n < a->n_items; n++)
item_free_contents(a->items + n);
set_free(a->children);
free(a->items);
return mfree(a);
}
static int item_compare(const Item *a, const Item *b) {
/* Make sure that the ownership taking item is put first, so
* that we first create the node, and then can adjust it */
if (takes_ownership(a->type) && !takes_ownership(b->type))
return -1;
if (!takes_ownership(a->type) && takes_ownership(b->type))
return 1;
return CMP(a->type, b->type);
}
static bool item_compatible(Item *a, Item *b) {
assert(a);
assert(b);
assert(streq(a->path, b->path));
if (takes_ownership(a->type) && takes_ownership(b->type))
/* check if the items are the same */
return streq_ptr(a->argument, b->argument) &&
a->uid_set == b->uid_set &&
a->uid == b->uid &&
a->gid_set == b->gid_set &&
a->gid == b->gid &&
a->mode_set == b->mode_set &&
a->mode == b->mode &&
a->age_set == b->age_set &&
a->age == b->age &&
a->age_by_file == b->age_by_file &&
a->age_by_dir == b->age_by_dir &&
a->mask_perms == b->mask_perms &&
a->keep_first_level == b->keep_first_level &&
a->major_minor == b->major_minor;
return true;
}
static bool should_include_path(const char *path) {
char **prefix;
STRV_FOREACH(prefix, arg_exclude_prefixes)
if (path_startswith(path, *prefix)) {
log_debug("Entry \"%s\" matches exclude prefix \"%s\", skipping.",
path, *prefix);
return false;
}
STRV_FOREACH(prefix, arg_include_prefixes)
if (path_startswith(path, *prefix)) {
log_debug("Entry \"%s\" matches include prefix \"%s\".", path, *prefix);
return true;
}
/* no matches, so we should include this path only if we have no allow list at all */
if (strv_isempty(arg_include_prefixes))
return true;
log_debug("Entry \"%s\" does not match any include prefix, skipping.", path);
return false;
}
static int specifier_expansion_from_arg(Item *i) {
_cleanup_free_ char *unescaped = NULL, *resolved = NULL;
char **xattr;
int r;
assert(i);
if (!i->argument)
return 0;
switch (i->type) {
case COPY_FILES:
case CREATE_SYMLINK:
case CREATE_FILE:
case TRUNCATE_FILE:
case WRITE_FILE:
r = cunescape(i->argument, 0, &unescaped);
if (r < 0)
return log_error_errno(r, "Failed to unescape parameter to write: %s", i->argument);
r = specifier_printf(unescaped, PATH_MAX-1, specifier_table, arg_root, NULL, &resolved);
if (r < 0)
return r;
free_and_replace(i->argument, resolved);
break;
case SET_XATTR:
case RECURSIVE_SET_XATTR:
STRV_FOREACH(xattr, i->xattrs) {
r = specifier_printf(*xattr, SIZE_MAX, specifier_table, arg_root, NULL, &resolved);
if (r < 0)
return r;
free_and_replace(*xattr, resolved);
}
break;
default:
break;
}
return 0;
}
static int patch_var_run(const char *fname, unsigned line, char **path) {
const char *k;
char *n;
assert(path);
assert(*path);
/* Optionally rewrites lines referencing /var/run/, to use /run/ instead. Why bother? tmpfiles merges lines in
* some cases and detects conflicts in others. If files/directories are specified through two equivalent lines
* this is problematic as neither case will be detected. Ideally we'd detect these cases by resolving symlinks
* early, but that's precisely not what we can do here as this code very likely is running very early on, at a
* time where the paths in question are not available yet, or even more importantly, our own tmpfiles rules
* might create the paths that are intermediary to the listed paths. We can't really cover the generic case,
* but the least we can do is cover the specific case of /var/run vs. /run, as /var/run is a legacy name for
* /run only, and we explicitly document that and require that on systemd systems the former is a symlink to
* the latter. Moreover files below this path are by far the primary usecase for tmpfiles.d/. */
k = path_startswith(*path, "/var/run/");
if (isempty(k)) /* Don't complain about other paths than /var/run, and not about /var/run itself either. */
return 0;
n = path_join("/run", k);
if (!n)
return log_oom();
/* Also log about this briefly. We do so at LOG_NOTICE level, as we fixed up the situation automatically, hence
* there's no immediate need for action by the user. However, in the interest of making things less confusing
* to the user, let's still inform the user that these snippets should really be updated. */
log_syntax(NULL, LOG_NOTICE, fname, line, 0,
"Line references path below legacy directory /var/run/, updating %s → %s; please update the tmpfiles.d/ drop-in file accordingly.",
*path, n);
free_and_replace(*path, n);
return 0;
}
static int find_uid(const char *user, uid_t *ret_uid, Hashmap **cache) {
int r;
assert(user);
assert(ret_uid);
/* First: parse as numeric UID string */
r = parse_uid(user, ret_uid);
if (r >= 0)
return r;
/* Second: pass to NSS if we are running "online" */
if (!arg_root)
return get_user_creds(&user, ret_uid, NULL, NULL, NULL, 0);
/* Third, synthesize "root" unconditionally */
if (streq(user, "root")) {
*ret_uid = 0;
return 0;
}
/* Fourth: use fgetpwent() to read /etc/passwd directly, if we are "offline" */
return name_to_uid_offline(arg_root, user, ret_uid, cache);
}
static int find_gid(const char *group, gid_t *ret_gid, Hashmap **cache) {
int r;
assert(group);
assert(ret_gid);
/* First: parse as numeric GID string */
r = parse_gid(group, ret_gid);
if (r >= 0)
return r;
/* Second: pass to NSS if we are running "online" */
if (!arg_root)
return get_group_creds(&group, ret_gid, 0);
/* Third, synthesize "root" unconditionally */
if (streq(group, "root")) {
*ret_gid = 0;
return 0;
}
/* Fourth: use fgetgrent() to read /etc/group directly, if we are "offline" */
return name_to_gid_offline(arg_root, group, ret_gid, cache);
}
static int parse_age_by_from_arg(const char *age_by_str, Item *item) {
AgeBy ab_f = 0, ab_d = 0;
static const struct {
char age_by_chr;
AgeBy age_by_flag;
} age_by_types[] = {
{ 'a', AGE_BY_ATIME },
{ 'b', AGE_BY_BTIME },
{ 'c', AGE_BY_CTIME },
{ 'm', AGE_BY_MTIME },
};
assert(age_by_str);
assert(item);
if (isempty(age_by_str))
return -EINVAL;
for (const char *s = age_by_str; *s != 0; s++) {
size_t i;
/* Ignore whitespace. */
if (strchr(WHITESPACE, *s))
continue;
for (i = 0; i < ELEMENTSOF(age_by_types); i++) {
/* Check lower-case for files, upper-case for directories. */
if (*s == age_by_types[i].age_by_chr) {
ab_f |= age_by_types[i].age_by_flag;
break;
} else if (*s == ascii_toupper(age_by_types[i].age_by_chr)) {
ab_d |= age_by_types[i].age_by_flag;
break;
}
}
/* Invalid character. */
if (i >= ELEMENTSOF(age_by_types))
return -EINVAL;
}
/* No match. */
if (ab_f == 0 && ab_d == 0)
return -EINVAL;
item->age_by_file = ab_f > 0 ? ab_f : AGE_BY_DEFAULT_FILE;
item->age_by_dir = ab_d > 0 ? ab_d : AGE_BY_DEFAULT_DIR;
return 0;
}
static int parse_line(
const char *fname,
unsigned line,
const char *buffer,
bool *invalid_config,
Hashmap **uid_cache,
Hashmap **gid_cache) {
_cleanup_free_ char *action = NULL, *mode = NULL, *user = NULL, *group = NULL, *age = NULL, *path = NULL;
_cleanup_(item_free_contents) Item i = {
/* The "age-by" argument considers all file timestamp types by default. */
.age_by_file = AGE_BY_DEFAULT_FILE,
.age_by_dir = AGE_BY_DEFAULT_DIR,
};
ItemArray *existing;
OrderedHashmap *h;
int r, pos;
bool append_or_force = false, boot = false, allow_failure = false, try_replace = false;
assert(fname);
assert(line >= 1);
assert(buffer);
r = extract_many_words(
&buffer,
NULL,
EXTRACT_UNQUOTE,
&action,
&path,
&mode,
&user,
&group,
&age,
NULL);
if (r < 0) {
if (IN_SET(r, -EINVAL, -EBADSLT))
/* invalid quoting and such or an unknown specifier */
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to parse line: %m");
} else if (r < 2) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Syntax error.");
}
if (!empty_or_dash(buffer)) {
i.argument = strdup(buffer);
if (!i.argument)
return log_oom();
}
if (isempty(action)) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Command too short '%s'.", action);
}
for (pos = 1; action[pos]; pos++) {
if (action[pos] == '!' && !boot)
boot = true;
else if (action[pos] == '+' && !append_or_force)
append_or_force = true;
else if (action[pos] == '-' && !allow_failure)
allow_failure = true;
else if (action[pos] == '=' && !try_replace)
try_replace = true;
else {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Unknown modifiers in command '%s'", action);
}
}
if (boot && !arg_boot) {
log_syntax(NULL, LOG_DEBUG, fname, line, 0, "Ignoring entry %s \"%s\" because --boot is not specified.", action, path);
return 0;
}
i.type = action[0];
i.append_or_force = append_or_force;
i.allow_failure = allow_failure;
i.try_replace = try_replace;
r = specifier_printf(path, PATH_MAX-1, specifier_table, arg_root, NULL, &i.path);
if (r == -ENXIO)
return log_unresolvable_specifier(fname, line);
if (r < 0) {
if (IN_SET(r, -EINVAL, -EBADSLT))
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to replace specifiers in '%s': %m", path);
}
r = patch_var_run(fname, line, &i.path);
if (r < 0)
return r;
switch (i.type) {
case CREATE_DIRECTORY:
case CREATE_SUBVOLUME:
case CREATE_SUBVOLUME_INHERIT_QUOTA:
case CREATE_SUBVOLUME_NEW_QUOTA:
case EMPTY_DIRECTORY:
case TRUNCATE_DIRECTORY:
case CREATE_FIFO:
case IGNORE_PATH:
case IGNORE_DIRECTORY_PATH:
case REMOVE_PATH:
case RECURSIVE_REMOVE_PATH:
case ADJUST_MODE:
case RELABEL_PATH:
case RECURSIVE_RELABEL_PATH:
if (i.argument)
log_syntax(NULL, LOG_WARNING, fname, line, 0, "%c lines don't take argument fields, ignoring.", i.type);
break;
case CREATE_FILE:
case TRUNCATE_FILE:
break;
case CREATE_SYMLINK:
if (!i.argument) {
i.argument = path_join("/usr/share/factory", i.path);
if (!i.argument)
return log_oom();
}
break;
case WRITE_FILE:
if (!i.argument) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Write file requires argument.");
}
break;
case COPY_FILES:
if (!i.argument) {
i.argument = path_join("/usr/share/factory", i.path);
if (!i.argument)
return log_oom();
} else if (!path_is_absolute(i.argument)) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Source path '%s' is not absolute.", i.argument);
}
if (!empty_or_root(arg_root)) {
char *p;
p = path_join(arg_root, i.argument);
if (!p)
return log_oom();
free_and_replace(i.argument, p);
}
path_simplify(i.argument);
break;
case CREATE_CHAR_DEVICE:
case CREATE_BLOCK_DEVICE:
if (!i.argument) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG), "Device file requires argument.");
}
r = parse_dev(i.argument, &i.major_minor);
if (r < 0) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r, "Can't parse device file major/minor '%s'.", i.argument);
}
break;
case SET_XATTR:
case RECURSIVE_SET_XATTR:
if (!i.argument) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Set extended attribute requires argument.");
}
r = parse_xattrs_from_arg(&i);
if (r < 0)
return r;
break;
case SET_ACL:
case RECURSIVE_SET_ACL:
if (!i.argument) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Set ACLs requires argument.");
}
r = parse_acls_from_arg(&i);
if (r < 0)
return r;
break;
case SET_ATTRIBUTE:
case RECURSIVE_SET_ATTRIBUTE:
if (!i.argument) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Set file attribute requires argument.");
}
r = parse_attribute_from_arg(&i);
if (IN_SET(r, -EINVAL, -EBADSLT))
*invalid_config = true;
if (r < 0)
return r;
break;
default:
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Unknown command type '%c'.", (char) i.type);
}
if (!path_is_absolute(i.path)) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, SYNTHETIC_ERRNO(EBADMSG),
"Path '%s' not absolute.", i.path);
}
path_simplify(i.path);
if (!should_include_path(i.path))
return 0;
r = specifier_expansion_from_arg(&i);
if (r == -ENXIO)
return log_unresolvable_specifier(fname, line);
if (r < 0) {
if (IN_SET(r, -EINVAL, -EBADSLT))
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to substitute specifiers in argument: %m");
}
if (!empty_or_root(arg_root)) {
char *p;
p = path_join(arg_root, i.path);
if (!p)
return log_oom();
free_and_replace(i.path, p);
}
if (!empty_or_dash(user)) {
r = find_uid(user, &i.uid, uid_cache);
if (r < 0) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve user '%s': %m", user);
}
i.uid_set = true;
}
if (!empty_or_dash(group)) {
r = find_gid(group, &i.gid, gid_cache);
if (r < 0) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r, "Failed to resolve group '%s'.", group);
}
i.gid_set = true;
}
if (!empty_or_dash(mode)) {
const char *mm = mode;
unsigned m;
if (*mm == '~') {
i.mask_perms = true;
mm++;
}
r = parse_mode(mm, &m);
if (r < 0) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid mode '%s'.", mode);
}
i.mode = m;
i.mode_set = true;
} else
i.mode = IN_SET(i.type, CREATE_DIRECTORY, TRUNCATE_DIRECTORY, CREATE_SUBVOLUME, CREATE_SUBVOLUME_INHERIT_QUOTA, CREATE_SUBVOLUME_NEW_QUOTA) ? 0755 : 0644;
if (!empty_or_dash(age)) {
const char *a = age;
_cleanup_free_ char *seconds = NULL, *age_by = NULL;
if (*a == '~') {
i.keep_first_level = true;
a++;
}
/* Format: "age-by:age"; where age-by is "[abcmABCM]+". */
r = split_pair(a, ":", &age_by, &seconds);
if (r == -ENOMEM)
return log_oom();
if (r < 0 && r != -EINVAL)
return log_error_errno(r, "Failed to parse age-by for '%s': %m", age);
if (r >= 0) {
/* We found a ":", parse the "age-by" part. */
r = parse_age_by_from_arg(age_by, &i);
if (r == -ENOMEM)
return log_oom();
if (r < 0) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age-by '%s'.", age_by);
}
/* For parsing the "age" part, after the ":". */
a = seconds;
}
r = parse_sec(a, &i.age);
if (r < 0) {
*invalid_config = true;
return log_syntax(NULL, LOG_ERR, fname, line, r, "Invalid age '%s'.", a);
}
i.age_set = true;
}
h = needs_glob(i.type) ? globs : items;
existing = ordered_hashmap_get(h, i.path);
if (existing) {
size_t n;
for (n = 0; n < existing->n_items; n++) {
if (!item_compatible(existing->items + n, &i) && !i.append_or_force) {
log_syntax(NULL, LOG_NOTICE, fname, line, 0, "Duplicate line for path \"%s\", ignoring.", i.path);
return 0;
}
}
} else {
existing = new0(ItemArray, 1);
if (!existing)
return log_oom();
r = ordered_hashmap_put(h, i.path, existing);
if (r < 0) {
free(existing);
return log_oom();
}
}
if (!GREEDY_REALLOC(existing->items, existing->n_items + 1))
return log_oom();
existing->items[existing->n_items++] = i;
i = (struct Item) {};
/* Sort item array, to enforce stable ordering of application */
typesafe_qsort(existing->items, existing->n_items, item_compare);
return 0;
}
static int cat_config(char **config_dirs, char **args) {
_cleanup_strv_free_ char **files = NULL;
int r;
r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, NULL);
if (r < 0)
return r;
return cat_files(NULL, files, 0);
}
static int exclude_default_prefixes(void) {
int r;
/* Provide an easy way to exclude virtual/memory file systems from what we do here. Useful in
* combination with --root= where we probably don't want to apply stuff to these dirs as they are
* likely over-mounted if the root directory is actually used, and it wouldbe less than ideal to have
* all kinds of files created/adjusted underneath these mount points. */
r = strv_extend_strv(
&arg_exclude_prefixes,
STRV_MAKE("/dev",
"/proc",
"/run",
"/sys"),
true);
if (r < 0)
return log_oom();
return 0;
}
static int help(void) {
_cleanup_free_ char *link = NULL;
int r;
r = terminal_urlify_man("systemd-tmpfiles", "8", &link);
if (r < 0)
return log_oom();
printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n"
"\n%sCreates, deletes and cleans up volatile and temporary files and directories.%s\n\n"
" -h --help Show this help\n"
" --user Execute user configuration\n"
" --version Show package version\n"
" --cat-config Show configuration files\n"
" --create Create marked files/directories\n"
" --clean Clean up marked directories\n"
" --remove Remove marked files/directories\n"
" --boot Execute actions only safe at boot\n"
" --prefix=PATH Only apply rules with the specified prefix\n"
" --exclude-prefix=PATH Ignore rules with the specified prefix\n"
" -E Ignore rules prefixed with /dev, /proc, /run, /sys\n"
" --root=PATH Operate on an alternate filesystem root\n"
" --image=PATH Operate on disk image as filesystem root\n"
" --replace=PATH Treat arguments as replacement for PATH\n"
" --no-pager Do not pipe output into a pager\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_CAT_CONFIG,
ARG_USER,
ARG_CREATE,
ARG_CLEAN,
ARG_REMOVE,
ARG_BOOT,
ARG_PREFIX,
ARG_EXCLUDE_PREFIX,
ARG_ROOT,
ARG_IMAGE,
ARG_REPLACE,
ARG_NO_PAGER,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "user", no_argument, NULL, ARG_USER },
{ "version", no_argument, NULL, ARG_VERSION },
{ "cat-config", no_argument, NULL, ARG_CAT_CONFIG },
{ "create", no_argument, NULL, ARG_CREATE },
{ "clean", no_argument, NULL, ARG_CLEAN },
{ "remove", no_argument, NULL, ARG_REMOVE },
{ "boot", no_argument, NULL, ARG_BOOT },
{ "prefix", required_argument, NULL, ARG_PREFIX },
{ "exclude-prefix", required_argument, NULL, ARG_EXCLUDE_PREFIX },
{ "root", required_argument, NULL, ARG_ROOT },
{ "image", required_argument, NULL, ARG_IMAGE },
{ "replace", required_argument, NULL, ARG_REPLACE },
{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
{}
};
int c, r;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hE", options, NULL)) >= 0)
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case ARG_CAT_CONFIG:
arg_cat_config = true;
break;
case ARG_USER:
arg_user = true;
break;
case ARG_CREATE:
arg_operation |= OPERATION_CREATE;
break;
case ARG_CLEAN:
arg_operation |= OPERATION_CLEAN;
break;
case ARG_REMOVE:
arg_operation |= OPERATION_REMOVE;
break;
case ARG_BOOT:
arg_boot = true;
break;
case ARG_PREFIX:
if (strv_push(&arg_include_prefixes, optarg) < 0)
return log_oom();
break;
case ARG_EXCLUDE_PREFIX:
if (strv_push(&arg_exclude_prefixes, optarg) < 0)
return log_oom();
break;
case ARG_ROOT:
r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_root);
if (r < 0)
return r;
break;
case ARG_IMAGE:
#ifdef STANDALONE
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"This systemd-tmpfiles version is compiled without support for --image=.");
#else
r = parse_path_argument(optarg, /* suppress_root= */ false, &arg_image);
if (r < 0)
return r;
#endif
/* Imply -E here since it makes little sense to create files persistently in the /run mountpoint of a disk image */
_fallthrough_;
case 'E':
r = exclude_default_prefixes();
if (r < 0)
return r;
break;
case ARG_REPLACE:
if (!path_is_absolute(optarg) ||
!endswith(optarg, ".conf"))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"The argument to --replace= must an absolute path to a config file");
arg_replace = optarg;
break;
case ARG_NO_PAGER:
arg_pager_flags |= PAGER_DISABLE;
break;
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
if (arg_operation == 0 && !arg_cat_config)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"You need to specify at least one of --clean, --create or --remove.");
if (arg_replace && arg_cat_config)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Option --replace= is not supported with --cat-config");
if (arg_replace && optind >= argc)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"When --replace= is given, some configuration items must be specified");
if (arg_root && arg_user)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Combination of --user and --root= is not supported.");
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.");
return 1;
}
static int read_config_file(char **config_dirs, const char *fn, bool ignore_enoent, bool *invalid_config) {
_cleanup_(hashmap_freep) Hashmap *uid_cache = NULL, *gid_cache = NULL;
_cleanup_fclose_ FILE *_f = NULL;
_cleanup_free_ char *pp = NULL;
unsigned v = 0;
FILE *f;
ItemArray *ia;
int r = 0;
assert(fn);
if (streq(fn, "-")) {
log_debug("Reading config from stdin…");
fn = "<stdin>";
f = stdin;
} else {
r = search_and_fopen(fn, "re", arg_root, (const char**) config_dirs, &_f, &pp);
if (r < 0) {
if (ignore_enoent && r == -ENOENT) {
log_debug_errno(r, "Failed to open \"%s\", ignoring: %m", fn);
return 0;
}
return log_error_errno(r, "Failed to open '%s': %m", fn);
}
log_debug("Reading config file \"%s\"…", pp);
fn = pp;
f = _f;
}
for (;;) {
_cleanup_free_ char *line = NULL;
bool invalid_line = false;
char *l;
int k;
k = read_line(f, LONG_LINE_MAX, &line);
if (k < 0)
return log_error_errno(k, "Failed to read '%s': %m", fn);
if (k == 0)
break;
v++;
l = strstrip(line);
if (IN_SET(*l, 0, '#'))
continue;
k = parse_line(fn, v, l, &invalid_line, &uid_cache, &gid_cache);
if (k < 0) {
if (invalid_line)
/* Allow reporting with a special code if the caller requested this */
*invalid_config = true;
else if (r == 0)
/* The first error becomes our return value */
r = k;
}
}
/* we have to determine age parameter for each entry of type X */
ORDERED_HASHMAP_FOREACH(ia, globs)
for (size_t ni = 0; ni < ia->n_items; ni++) {
ItemArray *ja;
Item *i = ia->items + ni, *candidate_item = NULL;
if (i->type != IGNORE_DIRECTORY_PATH)
continue;
ORDERED_HASHMAP_FOREACH(ja, items)
for (size_t nj = 0; nj < ja->n_items; nj++) {
Item *j = ja->items + nj;
if (!IN_SET(j->type, CREATE_DIRECTORY,
TRUNCATE_DIRECTORY,
CREATE_SUBVOLUME,
CREATE_SUBVOLUME_INHERIT_QUOTA,
CREATE_SUBVOLUME_NEW_QUOTA))
continue;
if (path_equal(j->path, i->path)) {
candidate_item = j;
break;
}
if (candidate_item
? (path_startswith(j->path, candidate_item->path) && fnmatch(i->path, j->path, FNM_PATHNAME | FNM_PERIOD) == 0)
: path_startswith(i->path, j->path) != NULL)
candidate_item = j;
}
if (candidate_item && candidate_item->age_set) {
i->age = candidate_item->age;
i->age_set = true;
}
}
if (ferror(f)) {
log_error_errno(errno, "Failed to read from file %s: %m", fn);
if (r == 0)
r = -EIO;
}
return r;
}
static int parse_arguments(char **config_dirs, char **args, bool *invalid_config) {
char **arg;
int r;
STRV_FOREACH(arg, args) {
r = read_config_file(config_dirs, *arg, false, invalid_config);
if (r < 0)
return r;
}
return 0;
}
static int read_config_files(char **config_dirs, char **args, bool *invalid_config) {
_cleanup_strv_free_ char **files = NULL;
_cleanup_free_ char *p = NULL;
char **f;
int r;
r = conf_files_list_with_replacement(arg_root, config_dirs, arg_replace, &files, &p);
if (r < 0)
return r;
STRV_FOREACH(f, files)
if (p && path_equal(*f, p)) {
log_debug("Parsing arguments at position \"%s\"…", *f);
r = parse_arguments(config_dirs, args, invalid_config);
if (r < 0)
return r;
} else
/* Just warn, ignore result otherwise.
* read_config_file() has some debug output, so no need to print anything. */
(void) read_config_file(config_dirs, *f, true, invalid_config);
return 0;
}
static int link_parent(ItemArray *a) {
const char *path;
char *prefix;
int r;
assert(a);
/* Finds the closest "parent" item array for the specified item array. Then registers the specified item array
* as child of it, and fills the parent in, linking them both ways. This allows us to later create parents
* before their children, and clean up/remove children before their parents. */
if (a->n_items <= 0)
return 0;
path = a->items[0].path;
prefix = newa(char, strlen(path) + 1);
PATH_FOREACH_PREFIX(prefix, path) {
ItemArray *j;
j = ordered_hashmap_get(items, prefix);
if (!j)
j = ordered_hashmap_get(globs, prefix);
if (j) {
r = set_ensure_put(&j->children, NULL, a);
if (r < 0)
return log_oom();
a->parent = j;
return 1;
}
}
return 0;
}
DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_array_hash_ops, char, string_hash_func, string_compare_func,
ItemArray, item_array_free);
static int run(int argc, char *argv[]) {
#ifndef STANDALONE
_cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL;
_cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL;
_cleanup_(umount_and_rmdir_and_freep) char *unlink_dir = NULL;
#endif
_cleanup_strv_free_ char **config_dirs = NULL;
bool invalid_config = false;
ItemArray *a;
enum {
PHASE_REMOVE_AND_CLEAN,
PHASE_CREATE,
_PHASE_MAX
} phase;
int r, k;
r = parse_argv(argc, argv);
if (r <= 0)
return r;
log_setup();
/* We require /proc/ for a lot of our operations, i.e. for adjusting access modes, for anything
* SELinux related, for recursive operation, for xattr, acl and chattr handling, for btrfs stuff and
* a lot more. It's probably the majority of invocations where /proc/ is required. Since people
* apparently invoke it without anyway and are surprised about the failures, let's catch this early
* and output a nice and friendly warning. */
if (proc_mounted() == 0)
return log_error_errno(SYNTHETIC_ERRNO(ENOSYS),
"/proc/ is not mounted, but required for successful operation of systemd-tmpfiles. "
"Please mount /proc/. Alternatively, consider using the --root= or --image= switches.");
/* Descending down file system trees might take a lot of fds */
(void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
if (arg_user) {
r = user_config_paths(&config_dirs);
if (r < 0)
return log_error_errno(r, "Failed to initialize configuration directory list: %m");
} else {
config_dirs = strv_split_nulstr(CONF_PATHS_NULSTR("tmpfiles.d"));
if (!config_dirs)
return log_oom();
}
if (DEBUG_LOGGING) {
_cleanup_free_ char *t = NULL;
char **i;
STRV_FOREACH(i, config_dirs) {
_cleanup_free_ char *j = NULL;
j = path_join(arg_root, *i);
if (!j)
return log_oom();
if (!strextend(&t, "\n\t", j))
return log_oom();
}
log_debug("Looking for configuration files in (higher priority first):%s", t);
}
if (arg_cat_config) {
(void) pager_open(arg_pager_flags);
return cat_config(config_dirs, argv + optind);
}
umask(0022);
r = mac_selinux_init();
if (r < 0)
return r;
#ifndef STANDALONE
if (arg_image) {
assert(!arg_root);
r = mount_image_privately_interactively(
arg_image,
DISSECT_IMAGE_GENERIC_ROOT |
DISSECT_IMAGE_REQUIRE_ROOT |
DISSECT_IMAGE_VALIDATE_OS |
DISSECT_IMAGE_RELAX_VAR_CHECK |
DISSECT_IMAGE_FSCK |
DISSECT_IMAGE_GROWFS,
&unlink_dir,
&loop_device,
&decrypted_image);
if (r < 0)
return r;
arg_root = strdup(unlink_dir);
if (!arg_root)
return log_oom();
}
#else
assert(!arg_image);
#endif
items = ordered_hashmap_new(&item_array_hash_ops);
globs = ordered_hashmap_new(&item_array_hash_ops);
if (!items || !globs)
return log_oom();
/* If command line arguments are specified along with --replace, read all
* configuration files and insert the positional arguments at the specified
* place. Otherwise, if command line arguments are specified, execute just
* them, and finally, without --replace= or any positional arguments, just
* read configuration and execute it.
*/
if (arg_replace || optind >= argc)
r = read_config_files(config_dirs, argv + optind, &invalid_config);
else
r = parse_arguments(config_dirs, argv + optind, &invalid_config);
if (r < 0)
return r;
/* Let's now link up all child/parent relationships */
ORDERED_HASHMAP_FOREACH(a, items) {
r = link_parent(a);
if (r < 0)
return r;
}
ORDERED_HASHMAP_FOREACH(a, globs) {
r = link_parent(a);
if (r < 0)
return r;
}
/* If multiple operations are requested, let's first run the remove/clean operations, and only then the create
* operations. i.e. that we first clean out the platform we then build on. */
for (phase = 0; phase < _PHASE_MAX; phase++) {
OperationMask op;
if (phase == PHASE_REMOVE_AND_CLEAN)
op = arg_operation & (OPERATION_REMOVE|OPERATION_CLEAN);
else if (phase == PHASE_CREATE)
op = arg_operation & OPERATION_CREATE;
else
assert_not_reached("unexpected phase");
if (op == 0) /* Nothing requested in this phase */
continue;
/* The non-globbing ones usually create things, hence we apply them first */
ORDERED_HASHMAP_FOREACH(a, items) {
k = process_item_array(a, op);
if (k < 0 && r >= 0)
r = k;
}
/* The globbing ones usually alter things, hence we apply them second. */
ORDERED_HASHMAP_FOREACH(a, globs) {
k = process_item_array(a, op);
if (k < 0 && r >= 0)
r = k;
}
}
if (ERRNO_IS_RESOURCE(r))
return r;
if (invalid_config)
return EX_DATAERR;
if (r < 0)
return EX_CANTCREAT;
return 0;
}
DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);