Home | History | Annotate | Line # | Download | only in gpt 
      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 1.15 2025/02/23 20:47:19 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 #include "gpt_private.h"
     51 
     52 static int cmd_destroy(gpt_t, int, char *[]);
     53 
     54 static const char *destroyhelp[] = {
     55 	"[-r]",
     56 };
     57 
     58 const struct gpt_cmd c_destroy = {
     59 	"destroy",
     60 	cmd_destroy,
     61 	destroyhelp, __arraycount(destroyhelp),
     62 	GPT_OPTGPT | GPT_SYNC,
     63 };
     64 
     65 #define usage() gpt_usage(NULL, &c_destroy)
     66 
     67 
     68 static int
     69 destroy(gpt_t gpt, int force __unused, int recoverable)
     70 {
     71 	map_t pri_hdr, sec_hdr, pmbr;
     72 
     73 	pri_hdr = map_find(gpt, MAP_TYPE_PRI_GPT_HDR);
     74 	sec_hdr = map_find(gpt, MAP_TYPE_SEC_GPT_HDR);
     75 	pmbr = map_find(gpt, MAP_TYPE_PMBR);
     76 
     77 	if (pri_hdr == NULL && sec_hdr == NULL) {
     78 		gpt_warnx(gpt, "Device doesn't contain a GPT");
     79 		return -1;
     80 	}
     81 
     82 	if (recoverable && sec_hdr == NULL) {
     83 		gpt_warnx(gpt, "Recoverability not possible");
     84 		return -1;
     85 	}
     86 
     87 	if (pri_hdr != NULL) {
     88 		memset(pri_hdr->map_data, 0, gpt->secsz);
     89 		if (gpt_write(gpt, pri_hdr) == -1) {
     90 			gpt_warnx(gpt, "Error writing primary header");
     91 			return -1;
     92 		}
     93 	}
     94 
     95 	if (!recoverable && sec_hdr != NULL) {
     96 		memset(sec_hdr->map_data, 0, gpt->secsz);
     97 		if (gpt_write(gpt, sec_hdr) == -1) {
     98 			gpt_warnx(gpt, "Error writing backup header");
     99 			return -1;
    100 		}
    101 	}
    102 
    103 	if (!recoverable && pmbr != NULL) {
    104 		memset(pmbr->map_data, 0, gpt->secsz);
    105 		if (gpt_write(gpt, pmbr) == -1) {
    106 			gpt_warnx(gpt, "Error deleting PMBR");
    107 			return -1;
    108 		}
    109 	}
    110 
    111 	return 0;
    112 }
    113 
    114 static int
    115 cmd_destroy(gpt_t gpt, int argc, char *argv[])
    116 {
    117 	int ch;
    118 	int recoverable = 0;
    119 
    120 	while ((ch = getopt(argc, argv, "fr")) != -1) {
    121 		switch(ch) {
    122 		case 'f':
    123 			break;
    124 		case 'r':
    125 			recoverable = 1;
    126 			break;
    127 		default:
    128 			return usage();
    129 		}
    130 	}
    131 
    132 	if (argc != optind)
    133 		return usage();
    134 
    135 	return destroy(gpt, 0, recoverable);
    136 }
    137