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., 675 Mass Ave, Cambridge, MA 02139, USA.
31 get_blkid_tag (const char *device, const char *tag)
36 /* Kill the cache file, forcing blkid to reread values from the
37 * original filesystems. In blkid there is a '-p' option which is
38 * supposed to do this, but (a) it doesn't work and (b) that option
39 * is not supported in RHEL 5.
41 unlink ("/etc/blkid/blkid.tab");
43 r = command (&out, &err,
44 "blkid", "-o", "value", "-s", tag, device, NULL);
46 reply_with_error ("%s: %s", device, err);
54 /* Trim trailing \n if present. */
55 size_t len = strlen (out);
56 if (len > 0 && out[len-1] == '\n')
59 return out; /* caller frees */
63 do_vfs_type (const char *device)
65 return get_blkid_tag (device, "TYPE");
69 do_vfs_label (const char *device)
71 return get_blkid_tag (device, "LABEL");
75 do_vfs_uuid (const char *device)
77 return get_blkid_tag (device, "UUID");