diff options
Diffstat (limited to 'src/grp-udev/libudev-core/udev-builtin-blkid.c')
| -rw-r--r-- | src/grp-udev/libudev-core/udev-builtin-blkid.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/src/grp-udev/libudev-core/udev-builtin-blkid.c b/src/grp-udev/libudev-core/udev-builtin-blkid.c new file mode 100644 index 0000000000..b56ffa62a3 --- /dev/null +++ b/src/grp-udev/libudev-core/udev-builtin-blkid.c @@ -0,0 +1,337 @@ +/* + * probe disks for filesystems and partitions + * + * Copyright (C) 2011 Kay Sievers <kay@vrfy.org> + * Copyright (C) 2011 Karel Zak <kzak@redhat.com> + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <blkid/blkid.h> +#include <errno.h> +#include <fcntl.h> +#include <getopt.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/stat.h> + +#include <systemd/sd-id128.h> + +#include "systemd-basic/alloc-util.h" +#include "systemd-basic/fd-util.h" +#include "systemd-basic/string-util.h" +#include "systemd-shared/efivars.h" +#include "systemd-shared/gpt.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) && defined(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 > 0 ? -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 -1; + + 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; + blkid_probe pr; + const char *data; + const char *name; + const char *prtype = NULL; + int nvals; + int i; + int err = 0; + bool is_gpt = false; + + static const struct option options[] = { + { "offset", optional_argument, NULL, 'o' }, + { "noraid", no_argument, NULL, 'R' }, + {} + }; + + for (;;) { + int option; + + option = getopt_long(argc, argv, "oR", options, NULL); + if (option == -1) + break; + + switch (option) { + case 'o': + offset = strtoull(optarg, NULL, 0); + 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 | + BLKID_SUBLKS_BADCSUM); + + 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 (blkid_probe_has_value(pr, "SBBADCSUM")) { + if (!blkid_probe_lookup_value(pr, "TYPE", &prtype, NULL)) + log_warning("incorrect %s checksum on %s", + prtype, udev_device_get_devnode(dev)); + else + log_warning("incorrect checksum on %s", + udev_device_get_devnode(dev)); + 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); + + blkid_free_probe(pr); +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, +}; |