| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * probe disks for filesystems and partitions |
| * |
| * Copyright © 2011 Karel Zak <kzak@redhat.com> |
| */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <getopt.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/stat.h> |
| |
| #include "sd-id128.h" |
| |
| #include "alloc-util.h" |
| #include "blkid-util.h" |
| #include "device-util.h" |
| #include "efi-loader.h" |
| #include "errno-util.h" |
| #include "fd-util.h" |
| #include "gpt.h" |
| #include "parse-util.h" |
| #include "string-util.h" |
| #include "strv.h" |
| #include "strxcpyx.h" |
| #include "udev-builtin.h" |
| |
| static void print_property(sd_device *dev, bool test, const char *name, const char *value) { |
| char s[256]; |
| |
| s[0] = '\0'; |
| |
| if (streq(name, "TYPE")) { |
| udev_builtin_add_property(dev, test, "ID_FS_TYPE", value); |
| |
| } else if (streq(name, "USAGE")) { |
| udev_builtin_add_property(dev, test, "ID_FS_USAGE", value); |
| |
| } else if (streq(name, "VERSION")) { |
| udev_builtin_add_property(dev, test, "ID_FS_VERSION", value); |
| |
| } else if (streq(name, "UUID")) { |
| blkid_safe_string(value, s, sizeof(s)); |
| udev_builtin_add_property(dev, test, "ID_FS_UUID", s); |
| blkid_encode_string(value, s, sizeof(s)); |
| udev_builtin_add_property(dev, test, "ID_FS_UUID_ENC", s); |
| |
| } else if (streq(name, "UUID_SUB")) { |
| blkid_safe_string(value, s, sizeof(s)); |
| udev_builtin_add_property(dev, test, "ID_FS_UUID_SUB", s); |
| blkid_encode_string(value, s, sizeof(s)); |
| udev_builtin_add_property(dev, test, "ID_FS_UUID_SUB_ENC", s); |
| |
| } else if (streq(name, "LABEL")) { |
| blkid_safe_string(value, s, sizeof(s)); |
| udev_builtin_add_property(dev, test, "ID_FS_LABEL", s); |
| blkid_encode_string(value, s, sizeof(s)); |
| udev_builtin_add_property(dev, test, "ID_FS_LABEL_ENC", s); |
| |
| } else if (STR_IN_SET(name, "FSSIZE", "FSLASTBLOCK", "FSBLOCKSIZE")) { |
| strscpyl(s, sizeof(s), "ID_FS_", name + 2, NULL); |
| udev_builtin_add_property(dev, test, s, value); |
| |
| } else if (streq(name, "PTTYPE")) { |
| udev_builtin_add_property(dev, test, "ID_PART_TABLE_TYPE", value); |
| |
| } else if (streq(name, "PTUUID")) { |
| udev_builtin_add_property(dev, test, "ID_PART_TABLE_UUID", value); |
| |
| } else if (streq(name, "PART_ENTRY_NAME")) { |
| blkid_encode_string(value, s, sizeof(s)); |
| udev_builtin_add_property(dev, test, "ID_PART_ENTRY_NAME", s); |
| |
| } else if (streq(name, "PART_ENTRY_TYPE")) { |
| blkid_encode_string(value, s, sizeof(s)); |
| udev_builtin_add_property(dev, test, "ID_PART_ENTRY_TYPE", s); |
| |
| } else if (startswith(name, "PART_ENTRY_")) { |
| strscpyl(s, sizeof(s), "ID_", name, NULL); |
| udev_builtin_add_property(dev, test, s, value); |
| |
| } else if (streq(name, "SYSTEM_ID")) { |
| blkid_encode_string(value, s, sizeof(s)); |
| udev_builtin_add_property(dev, test, "ID_FS_SYSTEM_ID", s); |
| |
| } else if (streq(name, "PUBLISHER_ID")) { |
| blkid_encode_string(value, s, sizeof(s)); |
| udev_builtin_add_property(dev, test, "ID_FS_PUBLISHER_ID", s); |
| |
| } else if (streq(name, "APPLICATION_ID")) { |
| blkid_encode_string(value, s, sizeof(s)); |
| udev_builtin_add_property(dev, test, "ID_FS_APPLICATION_ID", s); |
| |
| } else if (streq(name, "BOOT_SYSTEM_ID")) { |
| blkid_encode_string(value, s, sizeof(s)); |
| udev_builtin_add_property(dev, test, "ID_FS_BOOT_SYSTEM_ID", s); |
| |
| } else if (streq(name, "VOLUME_ID")) { |
| blkid_encode_string(value, s, sizeof(s)); |
| udev_builtin_add_property(dev, test, "ID_FS_VOLUME_ID", s); |
| |
| } else if (streq(name, "LOGICAL_VOLUME_ID")) { |
| blkid_encode_string(value, s, sizeof(s)); |
| udev_builtin_add_property(dev, test, "ID_FS_LOGICAL_VOLUME_ID", s); |
| |
| } else if (streq(name, "VOLUME_SET_ID")) { |
| blkid_encode_string(value, s, sizeof(s)); |
| udev_builtin_add_property(dev, test, "ID_FS_VOLUME_SET_ID", s); |
| |
| } else if (streq(name, "DATA_PREPARER_ID")) { |
| blkid_encode_string(value, s, sizeof(s)); |
| udev_builtin_add_property(dev, test, "ID_FS_DATA_PREPARER_ID", s); |
| } |
| } |
| |
| static int find_gpt_root(sd_device *dev, blkid_probe pr, bool test) { |
| |
| #if defined(SD_GPT_ROOT_NATIVE) && ENABLE_EFI |
| |
| _cleanup_free_ char *root_label = NULL; |
| bool found_esp_or_xbootldr = false; |
| sd_id128_t root_id = SD_ID128_NULL; |
| int r; |
| |
| assert(pr); |
| |
| /* Iterate through the partitions on this disk, and see if the UEFI ESP or XBOOTLDR partition we |
| * booted from is on it. If so, find the first root disk, and add a property indicating its partition |
| * UUID. */ |
| |
| errno = 0; |
| blkid_partlist pl = blkid_probe_get_partitions(pr); |
| if (!pl) |
| return errno_or_else(ENOMEM); |
| |
| int nvals = blkid_partlist_numof_partitions(pl); |
| for (int i = 0; i < nvals; i++) { |
| blkid_partition pp; |
| const char *label; |
| sd_id128_t type, id; |
| |
| pp = blkid_partlist_get_partition(pl, i); |
| if (!pp) |
| continue; |
| |
| r = blkid_partition_get_uuid_id128(pp, &id); |
| if (r < 0) { |
| log_debug_errno(r, "Failed to get partition UUID, ignoring: %m"); |
| continue; |
| } |
| |
| r = blkid_partition_get_type_id128(pp, &type); |
| if (r < 0) { |
| log_debug_errno(r, "Failed to get partition type UUID, ignoring: %m"); |
| continue; |
| } |
| |
| label = blkid_partition_get_name(pp); /* returns NULL if empty */ |
| |
| if (sd_id128_in_set(type, SD_GPT_ESP, SD_GPT_XBOOTLDR)) { |
| sd_id128_t esp_or_xbootldr; |
| |
| /* We found an ESP or XBOOTLDR, let's see if it matches the ESP/XBOOTLDR we booted from. */ |
| |
| r = efi_loader_get_device_part_uuid(&esp_or_xbootldr); |
| if (r < 0) |
| return r; |
| |
| if (sd_id128_equal(id, esp_or_xbootldr)) |
| found_esp_or_xbootldr = true; |
| |
| } else if (sd_id128_equal(type, SD_GPT_ROOT_NATIVE)) { |
| unsigned long long flags; |
| |
| flags = blkid_partition_get_flags(pp); |
| if (flags & SD_GPT_FLAG_NO_AUTO) |
| continue; |
| |
| /* We found a suitable root partition, let's remember the first one, or the one with |
| * the newest version, as determined by comparing the partition labels. */ |
| |
| if (sd_id128_is_null(root_id) || strverscmp_improved(label, root_label) > 0) { |
| root_id = id; |
| |
| r = free_and_strdup(&root_label, label); |
| if (r < 0) |
| return r; |
| } |
| } |
| } |
| |
| /* We found the ESP/XBOOTLDR on this disk, and also found a root partition, nice! Let's export its |
| * UUID */ |
| if (found_esp_or_xbootldr && !sd_id128_is_null(root_id)) |
| udev_builtin_add_property(dev, test, "ID_PART_GPT_AUTO_ROOT_UUID", SD_ID128_TO_UUID_STRING(root_id)); |
| #endif |
| |
| return 0; |
| } |
| |
| static int probe_superblocks(blkid_probe pr) { |
| struct stat st; |
| int rc; |
| |
| /* TODO: Return negative errno. */ |
| |
| if (fstat(blkid_probe_get_fd(pr), &st)) |
| return -errno; |
| |
| blkid_probe_enable_partitions(pr, 1); |
| |
| if (!S_ISCHR(st.st_mode) && |
| blkid_probe_get_size(pr) <= 1024 * 1440 && |
| blkid_probe_is_wholedisk(pr)) { |
| /* |
| * check if the small disk is partitioned, if yes then |
| * don't probe for filesystems. |
| */ |
| blkid_probe_enable_superblocks(pr, 0); |
| |
| rc = blkid_do_fullprobe(pr); |
| if (rc < 0) |
| return rc; /* -1 = error, 1 = nothing, 0 = success */ |
| |
| if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0) |
| return 0; /* partition table detected */ |
| } |
| |
| blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS); |
| blkid_probe_enable_superblocks(pr, 1); |
| |
| return blkid_do_safeprobe(pr); |
| } |
| |
| static int builtin_blkid(sd_device *dev, sd_netlink **rtnl, int argc, char *argv[], bool test) { |
| const char *devnode, *root_partition = NULL, *data, *name; |
| _cleanup_(blkid_free_probep) blkid_probe pr = NULL; |
| bool noraid = false, is_gpt = false; |
| _cleanup_close_ int fd = -EBADF; |
| int64_t offset = 0; |
| int r; |
| |
| static const struct option options[] = { |
| { "offset", required_argument, NULL, 'o' }, |
| { "hint", required_argument, NULL, 'H' }, |
| { "noraid", no_argument, NULL, 'R' }, |
| {} |
| }; |
| |
| errno = 0; |
| pr = blkid_new_probe(); |
| if (!pr) |
| return log_device_debug_errno(dev, errno_or_else(ENOMEM), "Failed to create blkid prober: %m"); |
| |
| for (;;) { |
| int option; |
| |
| option = getopt_long(argc, argv, "o:H:R", options, NULL); |
| if (option == -1) |
| break; |
| |
| switch (option) { |
| case 'H': |
| #if HAVE_BLKID_PROBE_SET_HINT |
| errno = 0; |
| r = blkid_probe_set_hint(pr, optarg, 0); |
| if (r < 0) |
| return log_device_error_errno(dev, errno_or_else(ENOMEM), "Failed to use '%s' probing hint: %m", optarg); |
| break; |
| #else |
| /* Use the hint <name>=<offset> as probing offset for old versions */ |
| optarg = strchr(optarg, '='); |
| if (!optarg) |
| /* no value means 0, do nothing for old versions */ |
| break; |
| ++optarg; |
| _fallthrough_; |
| #endif |
| case 'o': |
| r = safe_atoi64(optarg, &offset); |
| if (r < 0) |
| return log_device_error_errno(dev, r, "Failed to parse '%s' as an integer: %m", optarg); |
| if (offset < 0) |
| return log_device_error_errno(dev, SYNTHETIC_ERRNO(EINVAL), "Invalid offset %"PRIi64": %m", offset); |
| break; |
| case 'R': |
| noraid = true; |
| break; |
| } |
| } |
| |
| blkid_probe_set_superblocks_flags(pr, |
| BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID | |
| BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE | |
| #ifdef BLKID_SUBLKS_FSINFO |
| BLKID_SUBLKS_FSINFO | |
| #endif |
| BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION); |
| |
| if (noraid) |
| blkid_probe_filter_superblocks_usage(pr, BLKID_FLTR_NOTIN, BLKID_USAGE_RAID); |
| |
| r = sd_device_get_devname(dev, &devnode); |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to get device name: %m"); |
| |
| fd = sd_device_open(dev, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); |
| if (fd < 0) { |
| bool ignore = ERRNO_IS_DEVICE_ABSENT(fd); |
| log_device_debug_errno(dev, fd, "Failed to open block device %s%s: %m", |
| devnode, ignore ? ", ignoring" : ""); |
| return ignore ? 0 : fd; |
| } |
| |
| errno = 0; |
| r = blkid_probe_set_device(pr, fd, offset, 0); |
| if (r < 0) |
| return log_device_debug_errno(dev, errno_or_else(ENOMEM), "Failed to set device to blkid prober: %m"); |
| |
| log_device_debug(dev, "Probe %s with %sraid and offset=%"PRIi64, devnode, noraid ? "no" : "", offset); |
| |
| r = probe_superblocks(pr); |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to probe superblocks: %m"); |
| |
| /* If the device is a partition then its parent passed the root partition UUID to the device */ |
| (void) sd_device_get_property_value(dev, "ID_PART_GPT_AUTO_ROOT_UUID", &root_partition); |
| |
| errno = 0; |
| int nvals = blkid_probe_numof_values(pr); |
| if (nvals < 0) |
| return log_device_debug_errno(dev, errno_or_else(ENOMEM), "Failed to get number of probed values: %m"); |
| |
| for (int i = 0; i < nvals; i++) { |
| if (blkid_probe_get_value(pr, i, &name, &data, NULL) < 0) |
| continue; |
| |
| print_property(dev, test, name, data); |
| |
| /* Is this a disk with GPT partition table? */ |
| if (streq(name, "PTTYPE") && streq(data, "gpt")) |
| is_gpt = true; |
| |
| /* Is this a partition that matches the root partition |
| * property inherited from the parent? */ |
| if (root_partition && streq(name, "PART_ENTRY_UUID") && streq(data, root_partition)) |
| udev_builtin_add_property(dev, test, "ID_PART_GPT_AUTO_ROOT", "1"); |
| } |
| |
| if (is_gpt) |
| find_gpt_root(dev, pr, test); |
| |
| return 0; |
| } |
| |
| const UdevBuiltin udev_builtin_blkid = { |
| .name = "blkid", |
| .cmd = builtin_blkid, |
| .help = "Filesystem and partition probing", |
| .run_once = true, |
| }; |
