1  /*
       2   * No copyright is claimed.  This code is in the public domain; do with
       3   * it what you wish.
       4   *
       5   * Written by Karel Zak <kzak@redhat.com>
       6   */
       7  #include "c.h"
       8  #include "nls.h"
       9  
      10  #include "swapheader.h"
      11  #include "swapprober.h"
      12  
      13  blkid_probe get_swap_prober(const char *devname)
      14  {
      15  	blkid_probe pr;
      16  	int rc;
      17  	const char *version = NULL;
      18  	char *swap_filter[] = { "swap", NULL };
      19  
      20  	pr = blkid_new_probe_from_filename(devname);
      21  	if (!pr) {
      22  		warn(_("%s: unable to probe device"), devname);
      23  		return NULL;
      24  	}
      25  
      26  	blkid_probe_enable_superblocks(pr, TRUE);
      27  	blkid_probe_set_superblocks_flags(pr,
      28  			BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
      29  			BLKID_SUBLKS_VERSION);
      30  
      31  	blkid_probe_filter_superblocks_type(pr, BLKID_FLTR_ONLYIN, swap_filter);
      32  
      33  	rc = blkid_do_safeprobe(pr);
      34  	if (rc == -1)
      35  		warn(_("%s: unable to probe device"), devname);
      36  	else if (rc == -2)
      37  		warnx(_("%s: ambiguous probing result; use wipefs(8)"), devname);
      38  	else if (rc == 1)
      39  		warnx(_("%s: not a valid swap partition"), devname);
      40  
      41  	if (rc == 0) {
      42  		/* Only the SWAPSPACE2 is supported. */
      43  		if (blkid_probe_lookup_value(pr, "VERSION", &version, NULL) == 0
      44  		    && version
      45  		    && strcmp(version, stringify_value(SWAP_VERSION)) != 0)
      46  			warnx(_("%s: unsupported swap version '%s'"),
      47  						devname, version);
      48  		else
      49  			return pr;
      50  	}
      51  
      52  	blkid_free_probe(pr);
      53  	return NULL;
      54  }