misc-utils/findfs.c

   1 /*
   2  * Copyright (C) 2009 Karel Zak <kzak@redhat.com>
   3  *
   4  * This file may be redistributed under the terms of the GNU Public
   5  * License.
   6  */
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <errno.h>
  11 #include <getopt.h>
  12
  13 #include <blkid.h>
  14
  15 #include "nls.h"
  16 #include "closestream.h"
  17 #include "c.h"
  18
  19 /* Exit codes used by findfs. */
  20 #define FINDFS_SUCCESS          0       /* no errors */
  21 #define FINDFS_NOT_FOUND        1       /* label or uuid cannot be found */
  22 #define FINDFS_USAGE_ERROR      2       /* user did something unexpected */
  23
  24 static void __attribute__((__noreturn__)) usage(void)
  25 {
  26         FILE *out = stdout;
  27         fputs(USAGE_HEADER, out);
  28         fprintf(out, _(" %s [options] {LABEL,UUID,PARTUUID,PARTLABEL}=<value>\n"),
  29                 program_invocation_short_name);
  30
  31         fputs(USAGE_SEPARATOR, out);
  32         fputs(_("Find a filesystem by label or UUID.\n"), out);
  33
  34         fputs(USAGE_OPTIONS, out);
  35         printf(USAGE_HELP_OPTIONS(16));
  36         printf(USAGE_MAN_TAIL("findfs(8)"));
  37         exit(FINDFS_SUCCESS);
  38 }
  39
  40 int main(int argc, char **argv)
  41 {
  42         char    *dev;
  43         int     c;
  44         static const struct option longopts[] = {
  45                 {"version", no_argument, NULL, 'V'},
  46                 {"help", no_argument, NULL, 'h'},
  47                 {NULL, 0, NULL, 0}
  48         };
  49
  50         setlocale(LC_ALL, "");
  51         bindtextdomain(PACKAGE, LOCALEDIR);
  52         textdomain(PACKAGE);
  53         atexit(close_stdout);
  54
  55         if (argc != 2) {
  56                 /* we return '2' for backward compatibility
  57                  * with version from e2fsprogs */
  58                 warnx(_("bad usage"));
  59                 errtryhelp(FINDFS_USAGE_ERROR);
  60         }
  61
  62         while ((c = getopt_long(argc, argv, "Vh", longopts, NULL)) != -1)
  63                 switch (c) {
  64                 case 'V':
  65                         printf(UTIL_LINUX_VERSION);
  66                         return FINDFS_SUCCESS;
  67                 case 'h':
  68                         usage();
  69                 default:
  70                         errtryhelp(FINDFS_USAGE_ERROR);
  71                 }
  72
  73         dev = blkid_evaluate_tag(argv[1], NULL, NULL);
  74         if (!dev)
  75                 errx(FINDFS_NOT_FOUND, _("unable to resolve '%s'"), argv[1]);
  76
  77         puts(dev);
  78         return FINDFS_SUCCESS;
  79 }
  80