release/src/router/busybox/util-linux/findfs.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Support functions for mounting devices by label/uuid
   4  *
   5  * Copyright (C) 2006 by Jason Schoon <floydpink@gmail.com>
   6  * Some portions cribbed from e2fsprogs, util-linux, dosfstools
   7  *
   8  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   9  */
  10
  11 //usage:#define findfs_trivial_usage
  12 //usage:       "LABEL=label or UUID=uuid"
  13 //usage:#define findfs_full_usage "\n\n"
  14 //usage:       "Find a filesystem device based on a label or UUID"
  15 //usage:
  16 //usage:#define findfs_example_usage
  17 //usage:       "$ findfs LABEL=MyDevice"
  18
  19 #include "libbb.h"
  20 #include "volume_id.h"
  21
  22 int findfs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  23 int findfs_main(int argc UNUSED_PARAM, char **argv)
  24 {
  25         char *dev = *++argv;
  26
  27         if (!dev)
  28                 bb_show_usage();
  29
  30         if (strncmp(dev, "/dev/", 5) == 0) {
  31                 /* Just pass any /dev/xxx name right through.
  32                  * This might aid in some scripts being able
  33                  * to call this unconditionally */
  34                 dev = NULL;
  35         } else {
  36                 /* Otherwise, handle LABEL=xxx and UUID=xxx,
  37                  * fail on anything else */
  38                 if (!resolve_mount_spec(argv))
  39                         bb_show_usage();
  40         }
  41
  42         if (*argv != dev) {
  43                 puts(*argv);
  44                 return 0;
  45         }
  46         return 1;
  47 }