331 lines
11 KiB
C
331 lines
11 KiB
C
/*
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* probe disks for filesystems and partitions
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*
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* Copyright (C) 2011 Kay Sievers <kay@vrfy.org>
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* Copyright (C) 2011 Karel Zak <kzak@redhat.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <sys/stat.h>
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#include <blkid/blkid.h>
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#include "sd-id128.h"
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#include "gpt.h"
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#include "efivars.h"
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#include "udev.h"
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static void print_property(struct udev_device *dev, bool test, const char *name, const char *value) {
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char s[256];
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s[0] = '\0';
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if (streq(name, "TYPE")) {
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udev_builtin_add_property(dev, test, "ID_FS_TYPE", value);
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} else if (streq(name, "USAGE")) {
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udev_builtin_add_property(dev, test, "ID_FS_USAGE", value);
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} else if (streq(name, "VERSION")) {
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udev_builtin_add_property(dev, test, "ID_FS_VERSION", value);
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} else if (streq(name, "UUID")) {
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blkid_safe_string(value, s, sizeof(s));
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udev_builtin_add_property(dev, test, "ID_FS_UUID", s);
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blkid_encode_string(value, s, sizeof(s));
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udev_builtin_add_property(dev, test, "ID_FS_UUID_ENC", s);
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} else if (streq(name, "UUID_SUB")) {
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blkid_safe_string(value, s, sizeof(s));
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udev_builtin_add_property(dev, test, "ID_FS_UUID_SUB", s);
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blkid_encode_string(value, s, sizeof(s));
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udev_builtin_add_property(dev, test, "ID_FS_UUID_SUB_ENC", s);
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} else if (streq(name, "LABEL")) {
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blkid_safe_string(value, s, sizeof(s));
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udev_builtin_add_property(dev, test, "ID_FS_LABEL", s);
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blkid_encode_string(value, s, sizeof(s));
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udev_builtin_add_property(dev, test, "ID_FS_LABEL_ENC", s);
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} else if (streq(name, "PTTYPE")) {
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udev_builtin_add_property(dev, test, "ID_PART_TABLE_TYPE", value);
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} else if (streq(name, "PTUUID")) {
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udev_builtin_add_property(dev, test, "ID_PART_TABLE_UUID", value);
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} else if (streq(name, "PART_ENTRY_NAME")) {
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blkid_encode_string(value, s, sizeof(s));
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udev_builtin_add_property(dev, test, "ID_PART_ENTRY_NAME", s);
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} else if (streq(name, "PART_ENTRY_TYPE")) {
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blkid_encode_string(value, s, sizeof(s));
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udev_builtin_add_property(dev, test, "ID_PART_ENTRY_TYPE", s);
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} else if (startswith(name, "PART_ENTRY_")) {
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strscpyl(s, sizeof(s), "ID_", name, NULL);
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udev_builtin_add_property(dev, test, s, value);
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} else if (streq(name, "SYSTEM_ID")) {
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blkid_encode_string(value, s, sizeof(s));
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udev_builtin_add_property(dev, test, "ID_FS_SYSTEM_ID", s);
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} else if (streq(name, "PUBLISHER_ID")) {
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blkid_encode_string(value, s, sizeof(s));
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udev_builtin_add_property(dev, test, "ID_FS_PUBLISHER_ID", s);
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} else if (streq(name, "APPLICATION_ID")) {
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blkid_encode_string(value, s, sizeof(s));
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udev_builtin_add_property(dev, test, "ID_FS_APPLICATION_ID", s);
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} else if (streq(name, "BOOT_SYSTEM_ID")) {
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blkid_encode_string(value, s, sizeof(s));
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udev_builtin_add_property(dev, test, "ID_FS_BOOT_SYSTEM_ID", s);
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}
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}
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static int find_gpt_root(struct udev_device *dev, blkid_probe pr, bool test) {
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#if defined(GPT_ROOT_NATIVE) && defined(ENABLE_EFI)
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_cleanup_free_ char *root_id = NULL;
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bool found_esp = false;
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blkid_partlist pl;
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int i, nvals, r;
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assert(pr);
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/* Iterate through the partitions on this disk, and see if the
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* EFI ESP we booted from is on it. If so, find the first root
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* disk, and add a property indicating its partition UUID. */
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errno = 0;
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pl = blkid_probe_get_partitions(pr);
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if (!pl)
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return errno ? -errno : -ENOMEM;
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nvals = blkid_partlist_numof_partitions(pl);
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for (i = 0; i < nvals; i++) {
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blkid_partition pp;
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const char *stype, *sid;
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sd_id128_t type;
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pp = blkid_partlist_get_partition(pl, i);
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if (!pp)
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continue;
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sid = blkid_partition_get_uuid(pp);
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if (!sid)
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continue;
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stype = blkid_partition_get_type_string(pp);
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if (!stype)
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continue;
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if (sd_id128_from_string(stype, &type) < 0)
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continue;
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if (sd_id128_equal(type, GPT_ESP)) {
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sd_id128_t id, esp;
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/* We found an ESP, let's see if it matches
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* the ESP we booted from. */
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if (sd_id128_from_string(sid, &id) < 0)
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continue;
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r = efi_loader_get_device_part_uuid(&esp);
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if (r < 0)
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return r;
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if (sd_id128_equal(id, esp))
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found_esp = true;
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} else if (sd_id128_equal(type, GPT_ROOT_NATIVE)) {
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/* We found a suitable root partition, let's
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* remember the first one. */
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if (!root_id) {
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root_id = strdup(sid);
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if (!root_id)
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return -ENOMEM;
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}
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}
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}
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/* We found the ESP on this disk, and also found a root
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* partition, nice! Let's export its UUID */
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if (found_esp && root_id)
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udev_builtin_add_property(dev, test, "ID_PART_GPT_AUTO_ROOT_UUID", root_id);
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#endif
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return 0;
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}
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static int probe_superblocks(blkid_probe pr) {
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struct stat st;
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int rc;
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if (fstat(blkid_probe_get_fd(pr), &st))
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return -1;
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blkid_probe_enable_partitions(pr, 1);
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if (!S_ISCHR(st.st_mode) &&
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blkid_probe_get_size(pr) <= 1024 * 1440 &&
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blkid_probe_is_wholedisk(pr)) {
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/*
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* check if the small disk is partitioned, if yes then
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* don't probe for filesystems.
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*/
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blkid_probe_enable_superblocks(pr, 0);
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rc = blkid_do_fullprobe(pr);
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if (rc < 0)
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return rc; /* -1 = error, 1 = nothing, 0 = success */
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if (blkid_probe_lookup_value(pr, "PTTYPE", NULL, NULL) == 0)
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return 0; /* partition table detected */
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}
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blkid_probe_set_partitions_flags(pr, BLKID_PARTS_ENTRY_DETAILS);
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blkid_probe_enable_superblocks(pr, 1);
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return blkid_do_safeprobe(pr);
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}
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static int builtin_blkid(struct udev_device *dev, int argc, char *argv[], bool test) {
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const char *root_partition;
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int64_t offset = 0;
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bool noraid = false;
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_cleanup_close_ int fd = -1;
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blkid_probe pr;
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const char *data;
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const char *name;
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const char *prtype = NULL;
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int nvals;
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int i;
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int err = 0;
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bool is_gpt = false;
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static const struct option options[] = {
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{ "offset", optional_argument, NULL, 'o' },
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{ "noraid", no_argument, NULL, 'R' },
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{}
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};
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for (;;) {
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int option;
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option = getopt_long(argc, argv, "oR", options, NULL);
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if (option == -1)
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break;
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switch (option) {
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case 'o':
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offset = strtoull(optarg, NULL, 0);
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break;
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case 'R':
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noraid = true;
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break;
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}
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}
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pr = blkid_new_probe();
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if (!pr)
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return EXIT_FAILURE;
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blkid_probe_set_superblocks_flags(pr,
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BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
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BLKID_SUBLKS_TYPE | BLKID_SUBLKS_SECTYPE |
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BLKID_SUBLKS_USAGE | BLKID_SUBLKS_VERSION |
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BLKID_SUBLKS_BADCSUM);
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if (noraid)
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blkid_probe_filter_superblocks_usage(pr, BLKID_FLTR_NOTIN, BLKID_USAGE_RAID);
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fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC);
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if (fd < 0) {
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fprintf(stderr, "error: %s: %m\n", udev_device_get_devnode(dev));
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goto out;
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}
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err = blkid_probe_set_device(pr, fd, offset, 0);
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if (err < 0)
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goto out;
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log_debug("probe %s %sraid offset=%"PRIu64,
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udev_device_get_devnode(dev),
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noraid ? "no" : "", offset);
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err = probe_superblocks(pr);
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if (err < 0)
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goto out;
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if (blkid_probe_has_value(pr, "SBBADCSUM")) {
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if (!blkid_probe_lookup_value(pr, "TYPE", &prtype, NULL))
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log_warning("incorrect %s checksum on %s",
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prtype, udev_device_get_devnode(dev));
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else
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log_warning("incorrect checksum on %s",
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udev_device_get_devnode(dev));
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goto out;
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}
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/* If we are a partition then our parent passed on the root
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* partition UUID to us */
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root_partition = udev_device_get_property_value(dev, "ID_PART_GPT_AUTO_ROOT_UUID");
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nvals = blkid_probe_numof_values(pr);
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for (i = 0; i < nvals; i++) {
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if (blkid_probe_get_value(pr, i, &name, &data, NULL))
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continue;
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print_property(dev, test, name, data);
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/* Is this a disk with GPT partition table? */
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if (streq(name, "PTTYPE") && streq(data, "gpt"))
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is_gpt = true;
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/* Is this a partition that matches the root partition
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* property we inherited from our parent? */
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if (root_partition && streq(name, "PART_ENTRY_UUID") && streq(data, root_partition))
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udev_builtin_add_property(dev, test, "ID_PART_GPT_AUTO_ROOT", "1");
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}
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if (is_gpt)
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find_gpt_root(dev, pr, test);
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blkid_free_probe(pr);
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out:
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if (err < 0)
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return EXIT_FAILURE;
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return EXIT_SUCCESS;
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}
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const struct udev_builtin udev_builtin_blkid = {
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.name = "blkid",
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.cmd = builtin_blkid,
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.help = "filesystem and partition probing",
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.run_once = true,
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};
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