320 lines
11 KiB
C
320 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* probe disks for filesystems and partitions
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*
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* Copyright © 2011 Karel Zak <kzak@redhat.com>
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*/
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#include <blkid.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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include "sd-id128.h"
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#include "alloc-util.h"
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#include "blkid-util.h"
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#include "device-util.h"
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#include "efivars.h"
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#include "errno-util.h"
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#include "fd-util.h"
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#include "gpt.h"
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#include "parse-util.h"
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#include "string-util.h"
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#include "strxcpyx.h"
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#include "udev-builtin.h"
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static void print_property(sd_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(sd_device *dev, blkid_probe pr, bool test) {
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#if defined(GPT_ROOT_NATIVE) && 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_or_else(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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unsigned long long flags;
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flags = blkid_partition_get_flags(pp);
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if (flags & GPT_FLAG_NO_AUTO)
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continue;
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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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/* TODO: Return negative errno. */
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if (fstat(blkid_probe_get_fd(pr), &st))
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return -errno;
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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(sd_device *dev, int argc, char *argv[], bool test) {
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const char *devnode, *root_partition = NULL, *data, *name;
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_cleanup_(blkid_free_probep) blkid_probe pr = NULL;
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bool noraid = false, is_gpt = false;
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_cleanup_close_ int fd = -1;
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int64_t offset = 0;
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int nvals, i, r;
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static const struct option options[] = {
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{ "offset", required_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, "o:R", 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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r = safe_atoi64(optarg, &offset);
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if (r < 0)
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return log_device_error_errno(dev, r, "Failed to parse '%s' as an integer: %m", optarg);
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if (offset < 0)
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return log_device_error_errno(dev, SYNTHETIC_ERRNO(ERANGE), "Invalid offset %"PRIi64": %m", offset);
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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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errno = 0;
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pr = blkid_new_probe();
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if (!pr)
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return log_device_debug_errno(dev, errno > 0 ? errno : ENOMEM, "Failed to create blkid prober: %m");
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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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if (noraid)
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blkid_probe_filter_superblocks_usage(pr, BLKID_FLTR_NOTIN, BLKID_USAGE_RAID);
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r = sd_device_get_devname(dev, &devnode);
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if (r < 0)
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return log_device_debug_errno(dev, r, "Failed to get device name: %m");
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fd = open(devnode, O_RDONLY|O_CLOEXEC);
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if (fd < 0)
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return log_device_debug_errno(dev, errno, "Failed to open block device %s: %m", devnode);
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errno = 0;
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r = blkid_probe_set_device(pr, fd, offset, 0);
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if (r < 0)
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return log_device_debug_errno(dev, errno > 0 ? errno : ENOMEM, "Failed to set device to blkid prober: %m");
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log_device_debug(dev, "Probe %s with %sraid and offset=%"PRIi64, devnode, noraid ? "no" : "", offset);
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r = probe_superblocks(pr);
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if (r < 0)
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return log_device_debug_errno(dev, r, "Failed to probe superblocks: %m");
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/* If the device is a partition then its parent passed the root partition UUID to the device */
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(void) sd_device_get_property_value(dev, "ID_PART_GPT_AUTO_ROOT_UUID", &root_partition);
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errno = 0;
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nvals = blkid_probe_numof_values(pr);
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if (nvals < 0)
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return log_device_debug_errno(dev, errno > 0 ? errno : ENOMEM, "Failed to get number of probed values: %m");
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for (i = 0; i < nvals; i++) {
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if (blkid_probe_get_value(pr, i, &name, &data, NULL) < 0)
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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 inherited from the 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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return 0;
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}
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const UdevBuiltin 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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