libblkid/samples/mkfs.c

   1 /*
   2  * Copyright (C) 2009 Karel Zak <kzak@redhat.com>
   3  *
   4  * This file may be redistributed under the terms of the
   5  * GNU Lesser General Public License.
   6  */
   7
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <sys/types.h>
  11 #include <sys/stat.h>
  12 #include <fcntl.h>
  13 #include <errno.h>
  14
  15 #include <blkid.h>
  16
  17 #include "c.h"
  18
  19 int main(int argc, char *argv[])
  20 {
  21         int rc;
  22         char *devname;
  23         blkid_probe pr;
  24         blkid_topology tp;
  25
  26         if (argc < 2) {
  27                 fprintf(stderr, "usage: %s <device>  "
  28                         "-- checks based on libblkid for mkfs-like programs.\n",
  29                         program_invocation_short_name);
  30                 return EXIT_FAILURE;
  31         }
  32
  33         devname = argv[1];
  34         pr = blkid_new_probe_from_filename(devname);
  35         if (!pr)
  36                 err(EXIT_FAILURE, "%s: failed to create a new libblkid probe",
  37                                 devname);
  38
  39         /*
  40          * check Filesystems / Partitions overwrite
  41          */
  42
  43         /* enable partitions probing (superblocks are enabled by default) */
  44         blkid_probe_enable_partitions(pr, TRUE);
  45
  46         rc = blkid_do_fullprobe(pr);
  47         if (rc == -1)
  48                 errx(EXIT_FAILURE, "%s: blkid_do_fullprobe() failed", devname);
  49         else if (rc == 0) {
  50                 const char *type;
  51
  52                 if (!blkid_probe_lookup_value(pr, "TYPE", &type, NULL))
  53                         errx(EXIT_FAILURE, "%s: appears to contain an existing "
  54                                         "%s superblock", devname, type);
  55
  56                 if (!blkid_probe_lookup_value(pr, "PTTYPE", &type, NULL))
  57                         errx(EXIT_FAILURE, "%s: appears to contain a partition "
  58                                         "table (%s)", devname, type);
  59         }
  60
  61         /*
  62          * get topology details
  63          */
  64         tp = blkid_probe_get_topology(pr);
  65         if (!tp)
  66                 errx(EXIT_FAILURE, "%s: failed to read topology", devname);
  67
  68
  69         /* ... your mkfs.<type> code or so ...
  70
  71         off = blkid_topology_get_alignment_offset(tp);
  72
  73          */
  74
  75         blkid_free_probe(pr);
  76
  77         return EXIT_SUCCESS;
  78 }