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destroy.c revision 1.6 
      1 /*-
      2  * Copyright (c) 2002 Marcel Moolenaar
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #if HAVE_NBTOOL_CONFIG_H
     28 #include "nbtool_config.h"
     29 #endif
     30 
     31 #include <sys/cdefs.h>
     32 #ifdef __FBSDID
     33 __FBSDID("$FreeBSD: src/sbin/gpt/destroy.c,v 1.6 2005/08/31 01:47:19 marcel Exp $");
     34 #endif
     35 #ifdef __RCSID
     36 __RCSID("$NetBSD: destroy.c,v 1.6 2014/09/29 21:04:34 christos Exp $");
     37 #endif
     38 
     39 #include <sys/types.h>
     40 
     41 #include <err.h>
     42 #include <stddef.h>
     43 #include <stdio.h>
     44 #include <stdlib.h>
     45 #include <string.h>
     46 #include <unistd.h>
     47 
     48 #include "map.h"
     49 #include "gpt.h"
     50 
     51 static int recoverable;
     52 
     53 const char destroymsg[] = "destroy [-r] device ...";
     54 
     55 __dead static void
     56 usage_destroy(void)
     57 {
     58 
     59 	fprintf(stderr,
     60 	    "usage: %s %s\n", getprogname(), destroymsg);
     61 	exit(1);
     62 }
     63 
     64 static void
     65 destroy(int fd)
     66 {
     67 	map_t *pri_hdr, *sec_hdr;
     68 
     69 	pri_hdr = map_find(MAP_TYPE_PRI_GPT_HDR);
     70 	sec_hdr = map_find(MAP_TYPE_SEC_GPT_HDR);
     71 
     72 	if (pri_hdr == NULL && sec_hdr == NULL) {
     73 		warnx("%s: error: device doesn't contain a GPT", device_name);
     74 		return;
     75 	}
     76 
     77 	if (recoverable && sec_hdr == NULL) {
     78 		warnx("%s: error: recoverability not possible", device_name);
     79 		return;
     80 	}
     81 
     82 	if (pri_hdr != NULL) {
     83 		memset(pri_hdr->map_data, 0, secsz);
     84 		gpt_write(fd, pri_hdr);
     85 	}
     86 
     87 	if (!recoverable && sec_hdr != NULL) {
     88 		memset(sec_hdr->map_data, 0, secsz);
     89 		gpt_write(fd, sec_hdr);
     90 	}
     91 }
     92 
     93 int
     94 cmd_destroy(int argc, char *argv[])
     95 {
     96 	int ch, fd;
     97 
     98 	while ((ch = getopt(argc, argv, "r")) != -1) {
     99 		switch(ch) {
    100 		case 'r':
    101 			recoverable = 1;
    102 			break;
    103 		default:
    104 			usage_destroy();
    105 		}
    106 	}
    107 
    108 	if (argc == optind)
    109 		usage_destroy();
    110 
    111 	while (optind < argc) {
    112 		fd = gpt_open(argv[optind++]);
    113 		if (fd == -1) {
    114 			warn("unable to open device '%s'", device_name);
    115 			continue;
    116 		}
    117 
    118 		destroy(fd);
    119 
    120 		gpt_close(fd);
    121 	}
    122 
    123 	return (0);
    124 }
    125