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/* 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"); /* Red Hat, Fedora */
unlink ("/etc/blkid.tab"); /* Debian */
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");
}
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