mirror of
https://github.com/libguestfs/libguestfs.git
synced 2026-03-22 07:03:38 +00:00
27b730a682
These APIs generalize the existing 'get-e2label' and 'get-e2uuid' calls, to provide calls which should be able to get the label and UUID for most filesystem types. These use 'blkid' to do the work. I have tested that the blkid commands themselves work on RHEL 5. (Suggested by Yufang Zhang).
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/* libguestfs - the guestfsd daemon
|
|
* Copyright (C) 2009 Red Hat Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <limits.h>
|
|
|
|
#include "daemon.h"
|
|
#include "actions.h"
|
|
|
|
static char *
|
|
get_blkid_tag (const char *device, const char *tag)
|
|
{
|
|
char *out, *err;
|
|
int r;
|
|
|
|
/* Kill the cache file, forcing blkid to reread values from the
|
|
* original filesystems. In blkid there is a '-p' option which is
|
|
* supposed to do this, but (a) it doesn't work and (b) that option
|
|
* is not supported in RHEL 5.
|
|
*/
|
|
unlink ("/etc/blkid/blkid.tab");
|
|
|
|
r = command (&out, &err,
|
|
"blkid", "-o", "value", "-s", tag, device, NULL);
|
|
if (r == -1) {
|
|
reply_with_error ("%s: %s", device, err);
|
|
free (out);
|
|
free (err);
|
|
return NULL;
|
|
}
|
|
|
|
free (err);
|
|
|
|
/* Trim trailing \n if present. */
|
|
size_t len = strlen (out);
|
|
if (len > 0 && out[len-1] == '\n')
|
|
out[len-1] = '\0';
|
|
|
|
return out; /* caller frees */
|
|
}
|
|
|
|
char *
|
|
do_vfs_type (const char *device)
|
|
{
|
|
return get_blkid_tag (device, "TYPE");
|
|
}
|
|
|
|
char *
|
|
do_vfs_label (const char *device)
|
|
{
|
|
return get_blkid_tag (device, "LABEL");
|
|
}
|
|
|
|
char *
|
|
do_vfs_uuid (const char *device)
|
|
{
|
|
return get_blkid_tag (device, "UUID");
|
|
}
|