| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * 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 "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 (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(sd_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_or_else(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; |
| |
| /* 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, 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 = -1; |
| int64_t offset = 0; |
| int nvals, i, r; |
| |
| 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': |
| 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(ERANGE), "Invalid offset %"PRIi64": %m", offset); |
| break; |
| case 'R': |
| noraid = true; |
| break; |
| } |
| } |
| |
| errno = 0; |
| pr = blkid_new_probe(); |
| if (!pr) |
| return log_device_debug_errno(dev, errno > 0 ? errno : ENOMEM, "Failed to create blkid prober: %m"); |
| |
| 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); |
| |
| r = sd_device_get_devname(dev, &devnode); |
| if (r < 0) |
| return log_device_debug_errno(dev, r, "Failed to get device name: %m"); |
| |
| fd = open(devnode, O_RDONLY|O_CLOEXEC|O_NONBLOCK); |
| if (fd < 0) |
| return log_device_debug_errno(dev, errno, "Failed to open block device %s: %m", devnode); |
| |
| errno = 0; |
| r = blkid_probe_set_device(pr, fd, offset, 0); |
| if (r < 0) |
| return log_device_debug_errno(dev, errno > 0 ? errno : 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; |
| nvals = blkid_probe_numof_values(pr); |
| if (nvals < 0) |
| return log_device_debug_errno(dev, errno > 0 ? errno : ENOMEM, "Failed to get number of probed values: %m"); |
| |
| for (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, |
| }; |