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https://github.com/libguestfs/libguestfs.git
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90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/* libguestfs - the guestfsd daemon
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* Copyright (C) 2010 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "daemon.h"
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#include "actions.h"
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static char *
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findfs (const char *tag, const char *label_or_uuid)
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{
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/* Kill the cache file, forcing blkid to reread values from the
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* original filesystems. In blkid there is a '-p' option which is
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* supposed to do this, but (a) it doesn't work and (b) that option
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* is not supported in RHEL 5.
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*/
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unlink ("/etc/blkid/blkid.tab");
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unlink ("/run/blkid/blkid.tab");
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size_t len = strlen (tag) + strlen (label_or_uuid) + 2;
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char arg[len];
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snprintf (arg, len, "%s=%s", tag, label_or_uuid);
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char *out, *err;
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int r = command (&out, &err, "findfs", arg, NULL);
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if (r == -1) {
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reply_with_error ("%s", err);
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free (out);
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free (err);
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return NULL;
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}
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free (err);
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/* Trim trailing \n if present. */
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len = strlen (out);
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if (len > 0 && out[len-1] == '\n')
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out[len-1] = '\0';
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if (STRPREFIX (out, "/dev/mapper/") || STRPREFIX (out, "/dev/dm-")) {
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char *canonical;
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r = lv_canonical (out, &canonical);
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if (r == -1) {
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free (out);
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return NULL;
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}
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if (r == 1) {
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free (out);
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out = canonical;
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}
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/* Ignore the case where r == 0. /dev/mapper does not correspond
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* to an LV, so the best we can do is just return it as-is.
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*/
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}
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return out; /* caller frees */
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}
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char *
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do_findfs_uuid (const char *uuid)
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{
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return findfs ("UUID", uuid);
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}
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char *
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do_findfs_label (const char *label)
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{
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return findfs ("LABEL", label);
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}
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