/*-
 * Copyright (c) 2004 Marcel Moolenaar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD: src/sbin/gpt/remove.c,v 1.10 2006/10/04 18:20:25 marcel Exp $
 */

#include <sys/types.h>

#include <err.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "gpt.h"

static bool all = false;
static uuid_t type;
static off_t block, size;
static unsigned int entry = MAP_NOENTRY;

static void
usage_remove(void)
{
        fprintf(stderr,
                "usage: %s -a device ...\n"
                "       %s [-b lba] [-i index] [-s lba] [-t uuid] device ...\n",
                getprogname(), getprogname());
        exit(1);
}

static void
rem(int fd)
{
        uuid_t uuid;
        map_t *gpt, *tpg;
        map_t *tbl, *lbt;
        map_t *m;
        struct gpt_hdr *hdr;
        struct gpt_ent *ent;
        unsigned int i;

        gpt = map_find(MAP_TYPE_GPT_PRI_HDR);
        if (gpt == NULL) {
                warnx("%s: error: no primary GPT header; run create or recover",
                    device_name);
                return;
        }

        tpg = map_find(MAP_TYPE_GPT_SEC_HDR);
        if (tpg == NULL) {
                warnx("%s: error: no secondary GPT header; run recover",
                    device_name);
                return;
        }

        tbl = map_find(MAP_TYPE_GPT_PRI_TBL);
        lbt = map_find(MAP_TYPE_GPT_SEC_TBL);
        if (tbl == NULL || lbt == NULL) {
                warnx("%s: error: run recover -- trust me", device_name);
                return;
        }

        /* Remove all matching entries in the map. */
        for (m = map_first(); m != NULL; m = m->map_next) {
                if (m->map_type != MAP_TYPE_GPT_PART ||
                    m->map_index == MAP_NOENTRY)
                        continue;
                if (entry != MAP_NOENTRY && entry != m->map_index)
                        continue;
                if (block > 0 && block != m->map_start)
                        continue;
                if (size > 0 && size != m->map_size)
                        continue;

                i = m->map_index;

                hdr = gpt->map_data;
                ent = (void *)((char *)tbl->map_data + i *
                    le32toh(hdr->hdr_entsz));
                uuid_dec_le(&ent->ent_type, &uuid);
                if (!uuid_is_nil(&type, NULL) &&
                    !uuid_equal(&type, &uuid, NULL))
                        continue;

                /* Remove the primary entry by clearing the partition type. */
                uuid_create_nil(&ent->ent_type, NULL);

                hdr->hdr_crc_table = htole32(crc32(tbl->map_data,
                    le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz)));
                hdr->hdr_crc_self = 0;
                hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));

                gpt_write(fd, gpt);
                gpt_write(fd, tbl);

                hdr = tpg->map_data;
                ent = (void *)((char *)lbt->map_data + i *
                    le32toh(hdr->hdr_entsz));

                /* Remove the secondary entry. */
                uuid_create_nil(&ent->ent_type, NULL);

                hdr->hdr_crc_table = htole32(crc32(lbt->map_data,
                    le32toh(hdr->hdr_entries) * le32toh(hdr->hdr_entsz)));
                hdr->hdr_crc_self = 0;
                hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));

                gpt_write(fd, lbt);
                gpt_write(fd, tpg);

                printf("%ss%u removed\n", device_name, m->map_index);
        }
}

int
cmd_remove(int argc, char *argv[])
{
        char *p;
        int ch, fd;

        /* Get the remove options */
        while ((ch = getopt(argc, argv, "ab:hi:s:t:")) != -1) {
                switch(ch) {
                case 'a':
                        all = true;
                        break;
                case 'b':
                        if (block > 0)
                                usage_remove();
                        block = strtoll(optarg, &p, 10);
                        if (*p != 0 || block < 1)
                                usage_remove();
                        break;
                case 'i':
                        if (entry != MAP_NOENTRY)
                                usage_remove();
                        entry = strtoul(optarg, &p, 10);
                        if (*p != 0 || entry == MAP_NOENTRY)
                                usage_remove();
                        break;
                case 's':
                        if (size > 0)
                                usage_remove();
                        size = strtoll(optarg, &p, 10);
                        if (*p != 0 || size < 1)
                                usage_remove();
                        break;
                case 't':
                        if (!uuid_is_nil(&type, NULL))
                                usage_remove();
                        if (parse_uuid(optarg, &type) != 0)
                                usage_remove();
                        break;
                case 'h':
                default:
                        usage_remove();
                }
        }

        if (!all ^
            (block > 0 || entry != MAP_NOENTRY || size > 0 ||
             !uuid_is_nil(&type, NULL)))
                usage_remove();

        if (argc == optind)
                usage_remove();

        while (optind < argc) {
                fd = gpt_open(argv[optind++]);
                if (fd == -1) {
                        warn("unable to open device '%s'", device_name);
                        continue;
                }

                rem(fd);

                gpt_close(fd);
        }

        return (0);
}