udev-builtin-blkid.c revision 8ebfe0cbaad12b55fd022650a841149a548d3e60
/*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <sys/stat.h>
#include <blkid/blkid.h>
#include "sd-id128.h"
#include "gpt.h"
#include "efivars.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 ? -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;
unsigned long long flags;
flags = blkid_partition_get_flags(pp);
if (flags & GPT_FLAG_NO_AUTO)
continue;
/* 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)) {
/* 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,
};