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https://github.com/libguestfs/libguestfs.git
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80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
/* libguestfs - the guestfsd daemon
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* Copyright (C) 2009 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., 675 Mass Ave, Cambridge, MA 02139, 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 <limits.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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get_blkid_tag (const char *device, const char *tag)
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{
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char *out, *err;
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int r;
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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"); /* Red Hat, Fedora */
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unlink ("/etc/blkid.tab"); /* Debian */
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r = command (&out, &err,
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"blkid", "-o", "value", "-s", tag, device, NULL);
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if (r == -1) {
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reply_with_error ("%s: %s", device, 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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size_t 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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return out; /* caller frees */
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}
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char *
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do_vfs_type (const char *device)
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{
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return get_blkid_tag (device, "TYPE");
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}
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char *
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do_vfs_label (const char *device)
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{
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return get_blkid_tag (device, "LABEL");
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}
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char *
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do_vfs_uuid (const char *device)
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{
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return get_blkid_tag (device, "UUID");
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}
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