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");
87 /* RHEL5 blkid doesn't have the -p(partition info) option and the
88 * -i(I/O limits) option so we must test for these options the first
89 * time the function is called.
92 test_blkid_p_opt(void)
97 int r = commandr(NULL, &err, "blkid", "-p", "/dev/null", NULL);
99 reply_with_error("could not run 'blkid' command: %s", err);
104 if (strstr(err, "invalid option --"))
113 blkid_with_p_opt(const char *device)
116 char *out = NULL, *err = NULL;
119 int size = 0, alloc = 0;
121 r = command(&out, &err, "blkid", "-c", "/dev/null",
122 "-p", "-i", "-o", "export", device, NULL);
124 reply_with_error("%s", err);
128 /* Split the command output into lines */
129 lines = split_lines(out);
131 reply_with_perror("malloc");
135 /* Parse the output of blkid -p -i -o export:
136 * UUID=b6d83437-c6b4-4bf0-8381-ef3fc3578590
140 * MINIMUM_IO_SIZE=512
141 * PHYSICAL_SECTOR_SIZE=512
142 * LOGICAL_SECTOR_SIZE=512
143 * PART_ENTRY_SCHEME=dos
144 * PART_ENTRY_TYPE=0x83
145 * PART_ENTRY_NUMBER=6
146 * PART_ENTRY_OFFSET=642875153
147 * PART_ENTRY_SIZE=104857600
148 * PART_ENTRY_DISK=8:0
150 for (char **i = lines; *i != NULL; i++) {
153 /* Skip blank lines (shouldn't happen) */
154 if (line[0] == '\0') continue;
156 /* Split the line in 2 at the equals sign */
157 char *eq = strchr(line, '=');
161 /* Add the key/value pair to the output */
162 if (add_string(&ret, &size, &alloc, line) == -1 ||
163 add_string(&ret, &size, &alloc, eq) == -1) goto error;
165 fprintf(stderr, "blkid: unexpected blkid output ignored: %s", line);
169 if (add_string(&ret, &size, &alloc, NULL) == -1) goto error;
180 if (lines) free(lines);
181 if (ret) free_strings(ret);
187 blkid_without_p_opt(const char *device)
190 int size = 0, alloc = 0;
192 if (add_string(&ret, &size, &alloc, "TYPE") == -1) goto error;
193 if (add_string(&ret, &size, &alloc, get_blkid_tag(device, "TYPE")) == -1)
195 if (add_string(&ret, &size, &alloc, "LABEL") == -1) goto error;
196 if (add_string(&ret, &size, &alloc, get_blkid_tag(device, "LABEL")) == -1)
198 if (add_string(&ret, &size, &alloc, "UUID") == -1) goto error;
199 if (add_string(&ret, &size, &alloc, get_blkid_tag(device, "UUID")) == -1)
201 if (add_string_nodup(&ret, &size, &alloc, NULL) == -1) goto error;
205 if (ret) free_strings(ret);
210 do_blkid(const char *device)
213 char *out = NULL, *err = NULL;
217 int size = 0, alloc = 0;
220 if ((blkid_has_p_opt = test_blkid_p_opt()) == -1)
222 else if (blkid_has_p_opt)
223 return blkid_with_p_opt(device);
225 return blkid_without_p_opt(device);