1 /* libguestfs - the guestfsd daemon
2 * Copyright (C) 2009 Red Hat Inc.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
31 get_blkid_tag (const char *device, const char *tag)
36 r = commandr (&out, &err,
38 /* Adding -c option kills all caching, even on RHEL 5. */
40 "-o", "value", "-s", tag, device, NULL);
41 if (r != 0 && r != 2) {
43 reply_with_error ("%s: %s (blkid returned %d)", device, err, r);
45 reply_with_error ("%s: %s", device, err);
53 if (r == 2) { /* means UUID etc not found */
57 reply_with_perror ("strdup");
61 /* Trim trailing \n if present. */
62 size_t len = strlen (out);
63 if (len > 0 && out[len-1] == '\n')
66 return out; /* caller frees */
70 do_vfs_type (const char *device)
72 return get_blkid_tag (device, "TYPE");
76 do_vfs_label (const char *device)
78 return get_blkid_tag (device, "LABEL");
82 do_vfs_uuid (const char *device)
84 return get_blkid_tag (device, "UUID");
88 do_blkid(const char *device)
91 char *out = NULL, *err = NULL;
95 int size = 0, alloc = 0;
97 const char *blkid[] = {"blkid", "-p", "-i", "-o", "export", device, NULL};
98 r = commandv(&out, &err, blkid);
100 reply_with_error("%s", err);
104 /* Split the command output into lines */
105 lines = split_lines(out);
107 reply_with_perror("malloc");
111 /* Parse the output of blkid -p -i -o export:
112 * UUID=b6d83437-c6b4-4bf0-8381-ef3fc3578590
116 * MINIMUM_IO_SIZE=512
117 * PHYSICAL_SECTOR_SIZE=512
118 * LOGICAL_SECTOR_SIZE=512
119 * PART_ENTRY_SCHEME=dos
120 * PART_ENTRY_TYPE=0x83
121 * PART_ENTRY_NUMBER=6
122 * PART_ENTRY_OFFSET=642875153
123 * PART_ENTRY_SIZE=104857600
124 * PART_ENTRY_DISK=8:0
126 for (char **i = lines; *i != NULL; i++) {
129 /* Skip blank lines (shouldn't happen) */
130 if (line[0] == '\0') continue;
132 /* Split the line in 2 at the equals sign */
133 char *eq = strchr(line, '=');
137 /* Add the key/value pair to the output */
138 if (add_string(&ret, &size, &alloc, line) == -1 ||
139 add_string(&ret, &size, &alloc, eq) == -1) goto error;
141 fprintf(stderr, "blkid: unexpected blkid output ignored: %s", line);
149 if (add_string(&ret, &size, &alloc, NULL) == -1) return NULL;
156 if (lines) free(lines);
157 if (ret) free_strings(ret);