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/* libguestfs - the guestfsd daemon
* Copyright (C) 2010 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "daemon.h"
#include "actions.h"
static char *
findfs (const char *tag, const char *label_or_uuid)
{
/* 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");
unlink ("/run/blkid/blkid.tab");
size_t len = strlen (tag) + strlen (label_or_uuid) + 2;
char arg[len];
snprintf (arg, len, "%s=%s", tag, label_or_uuid);
char *out, *err;
int r = command (&out, &err, "findfs", arg, NULL);
if (r == -1) {
reply_with_error ("%s", err);
free (out);
free (err);
return NULL;
}
free (err);
/* Trim trailing \n if present. */
len = strlen (out);
if (len > 0 && out[len-1] == '\n')
out[len-1] = '\0';
if (STRPREFIX (out, "/dev/mapper/") || STRPREFIX (out, "/dev/dm-")) {
char *canonical;
r = lv_canonical (out, &canonical);
if (r == -1) {
free (out);
return NULL;
}
if (r == 1) {
free (out);
out = canonical;
}
/* Ignore the case where r == 0. /dev/mapper does not correspond
* to an LV, so the best we can do is just return it as-is.
*/
}
return out; /* caller frees */
}
char *
do_findfs_uuid (const char *uuid)
{
return findfs ("UUID", uuid);
}
char *
do_findfs_label (const char *label)
{
return findfs ("LABEL", label);
}
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