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
  12 #include <blkid.h>
  13
  14 #include "nls.h"
  15 #include "closestream.h"
  16 #include "c.h"
  17 #include "exitcodes.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(int rc)
  25 {
  26         FILE *out = rc ? stderr : 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         fputs(USAGE_HELP, out);
  36         fputs(USAGE_VERSION, out);
  37         fprintf(out, USAGE_MAN_TAIL("findfs(8)"));
  38         exit(rc);
  39 }
  40
  41 int main(int argc, char **argv)
  42 {
  43         char    *dev;
  44
  45         setlocale(LC_ALL, "");
  46         bindtextdomain(PACKAGE, LOCALEDIR);
  47         textdomain(PACKAGE);
  48         atexit(close_stdout);
  49
  50         if (argc != 2)
  51                 /* we return '2' for backward compatibility
  52                  * with version from e2fsprogs */
  53                 usage(FINDFS_USAGE_ERROR);
  54
  55         if (strcmp(argv[1], "-V") == 0 ||
  56                    strcmp(argv[1], "--version") == 0) {
  57                 printf(UTIL_LINUX_VERSION);
  58                 return FINDFS_SUCCESS;
  59         } else if (strcmp(argv[1], "-h") == 0 ||
  60                    strcmp(argv[1], "--help") == 0) {
  61                 usage(FINDFS_SUCCESS);
  62         } else if (argv[1][0] == '-')
  63                 usage(FINDFS_USAGE_ERROR);
  64
  65         dev = blkid_evaluate_tag(argv[1], NULL, NULL);
  66         if (!dev)
  67                 errx(FINDFS_NOT_FOUND, _("unable to resolve '%s'"), argv[1]);
  68
  69         puts(dev);
  70         return FINDFS_SUCCESS;
  71 }
  72