/* SPDX-License-Identifier: GPL-2.0+ */ /* * probe disks for filesystems and partitions * * Copyright © 2011 Karel Zak * */ #include #include #include #include #include #include #include #include #include "sd-id128.h" #include "alloc-util.h" #include "blkid-util.h" #include "efivars.h" #include "fd-util.h" #include "gpt.h" #include "parse-util.h" #include "string-util.h" #include "udev.h" static void print_property(struct udev_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 (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); } } static int find_gpt_root(struct udev_device *dev, blkid_probe pr, bool test) { #if defined(GPT_ROOT_NATIVE) && ENABLE_EFI _cleanup_free_ char *root_id = NULL; bool found_esp = false; blkid_partlist pl; int i, nvals, r; assert(pr); /* Iterate through the partitions on this disk, and see if the * EFI ESP we booted from is on it. If so, find the first root * disk, and add a property indicating its partition UUID. */ errno = 0; pl = blkid_probe_get_partitions(pr); if (!pl) return -errno ?: -ENOMEM; nvals = blkid_partlist_numof_partitions(pl); for (i = 0; i < nvals; i++) { blkid_partition pp; const char *stype, *sid; sd_id128_t type; pp = blkid_partlist_get_partition(pl, i); if (!pp) continue; sid = blkid_partition_get_uuid(pp); if (!sid) continue; stype = blkid_partition_get_type_string(pp); if (!stype) continue; if (sd_id128_from_string(stype, &type) < 0) continue; if (sd_id128_equal(type, GPT_ESP)) { sd_id128_t id, esp; /* We found an ESP, let's see if it matches * the ESP we booted from. */ if (sd_id128_from_string(sid, &id) < 0) continue; r = efi_loader_get_device_part_uuid(&esp); if (r < 0) return r; if (sd_id128_equal(id, esp)) found_esp = true; } else if (sd_id128_equal(type, GPT_ROOT_NATIVE)) { unsigned long long flags; flags = blkid_partition_get_flags(pp); if (flags & GPT_FLAG_NO_AUTO) continue; /* We found a suitable root partition, let's * remember the first one. */ if (!root_id) { root_id = strdup(sid); if (!root_id) return -ENOMEM; } } } /* We found the ESP on this disk, and also found a root * partition, nice! Let's export its UUID */ if (found_esp && root_id) udev_builtin_add_property(dev, test, "ID_PART_GPT_AUTO_ROOT_UUID", root_id); #endif return 0; } static int probe_superblocks(blkid_probe pr) { struct stat st; int rc; 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(struct udev_device *dev, int argc, char *argv[], bool test) { const char *root_partition; int64_t offset = 0; bool noraid = false; _cleanup_close_ int fd = -1; _cleanup_(blkid_free_probep) blkid_probe pr = NULL; const char *data; const char *name; int nvals; int i; int err = 0; bool is_gpt = false; static const struct option options[] = { { "offset", required_argument, NULL, 'o' }, { "noraid", no_argument, NULL, 'R' }, {} }; for (;;) { int option; option = getopt_long(argc, argv, "o:R", options, NULL); if (option == -1) break; switch (option) { case 'o': err = safe_atoi64(optarg, &offset); if (err < 0) goto out; if (offset < 0) { err = -ERANGE; goto out; } break; case 'R': noraid = true; break; } } pr = blkid_new_probe(); if (!pr) return EXIT_FAILURE; blkid_probe_set_superblocks_flags(pr, BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID | BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE | BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION); if (noraid) blkid_probe_filter_superblocks_usage(pr, BLKID_FLTR_NOTIN, BLKID_USAGE_RAID); fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC); if (fd < 0) { err = log_debug_errno(errno, "Failure opening block device %s: %m", udev_device_get_devnode(dev)); goto out; } err = blkid_probe_set_device(pr, fd, offset, 0); if (err < 0) goto out; log_debug("probe %s %sraid offset=%"PRIi64, udev_device_get_devnode(dev), noraid ? "no" : "", offset); err = probe_superblocks(pr); if (err < 0) goto out; /* If we are a partition then our parent passed on the root * partition UUID to us */ root_partition = udev_device_get_property_value(dev, "ID_PART_GPT_AUTO_ROOT_UUID"); nvals = blkid_probe_numof_values(pr); for (i = 0; i < nvals; i++) { if (blkid_probe_get_value(pr, i, &name, &data, NULL)) 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 we inherited from our 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); out: if (err < 0) return EXIT_FAILURE; return EXIT_SUCCESS; } const struct udev_builtin udev_builtin_blkid = { .name = "blkid", .cmd = builtin_blkid, .help = "Filesystem and partition probing", .run_once = true, };