/*
 * Copyright (c) 2007 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Matthew Dillon <dillon@backplane.com>
 *
 * 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.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``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
 * COPYRIGHT HOLDERS OR CONTRIBUTORS 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.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <vfs/hammer/hammer_mount.h>

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stddef.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <err.h>
#include <mntopts.h>

static void test_master_id(int master_id);
static void extract_volumes(struct hammer_mount_info *info, char **av, int ac);
static void free_volumes(struct hammer_mount_info *info);
static void usage(void);

#define hwarnx(format, args...) warnx("WARNING: "format,## args)

#define MOPT_HAMMEROPTS         \
        { "history", 1, HMNT_NOHISTORY, 1 },    \
        { "master=", 0, HMNT_MASTERID, 1 },     \
        { "mirror", 1, HMNT_NOMIRROR, 1 }

static struct mntopt mopts[] = { MOPT_STDOPTS, MOPT_HAMMEROPTS,
                                 MOPT_UPDATE, MOPT_NULL };

int
main(int ac, char **av)
{
        struct hammer_mount_info info;
        struct vfsconf vfc;
        int mount_flags = 0;
        int init_flags = 0;
        int error;
        int ch;
        char *mountpt;
        char *ptr;

        bzero(&info, sizeof(info));

        while ((ch = getopt(ac, av, "o:T:u")) != -1) {
                switch(ch) {
                case 'T':
                        info.asof = strtoull(optarg, NULL, 0);
                        break;
                case 'o':
                        getmntopts(optarg, mopts, &mount_flags, &info.hflags);

                        /*
                         * Handle extended flags with parameters.
                         */
                        if (info.hflags & HMNT_MASTERID) {
                                ptr = strstr(optarg, "master=");
                                if (ptr) {
                                        info.master_id = strtol(ptr + 7, NULL, 0);
                                        test_master_id(info.master_id);
                                }
                        }
                        if (info.hflags & HMNT_NOMIRROR) {
                                ptr = strstr(optarg, "nomirror");
                                if (ptr)
                                        info.master_id = -1;
                        }
                        break;
                case 'u':
                        init_flags |= MNT_UPDATE;
                        break;
                default:
                        usage();
                        /* not reached */
                        break;
                }
        }
        ac -= optind;
        av += optind;
        mount_flags |= init_flags;

        /*
         * Only the mount point need be specified in update mode.
         */
        if (init_flags & MNT_UPDATE) {
                if (ac != 1) {
                        usage();
                        /* not reached */
                }
                mountpt = av[0];
                if (mount(vfc.vfc_name, mountpt, mount_flags, &info)) {
                        err(1, "mountpoint %s", mountpt);
                        /* not reached */
                }
                exit(0);
        }

        if (ac < 2) {
                usage();
                /* not reached */
        }

        /*
         * Mount arguments: vol [vol...] mountpt
         */
        extract_volumes(&info, av, ac - 1);
        mountpt = av[ac - 1];

        /*
         * Load the hammer module if necessary (this bit stolen from
         * mount_null).
         */
        error = getvfsbyname("hammer", &vfc);
        if (error && vfsisloadable("hammer")) {
                if (vfsload("hammer") != 0) {
                        err(1, "vfsload(hammer)");
                        /* not reached */
                }
                endvfsent();
                error = getvfsbyname("hammer", &vfc);
        }
        if (error) {
                errx(1, "hammer filesystem is not available");
                /* not reached */
        }

        if (mount(vfc.vfc_name, mountpt, mount_flags, &info)) {
                perror("mount");
                exit(1);
        }
        free_volumes(&info);

        return(0);
}

static
void
test_master_id(int master_id)
{
        switch (master_id) {
        case 0:
                hwarnx("A master id of 0 is the default, "
                        "explicit settings should use 1-15");
                break;
        case -1:
                hwarnx("A master id of -1 is nomirror mode, "
                        "equivalent to -o nomirror option");
                break;
        case 1 ... 15: /* gcc */
                /* Expected values via -o master= option */
                break;
        default:
                /* This will eventually fail in hammer_vfs_mount() */
                hwarnx("A master id of %d is not supported", master_id);
                break;
        }
}

/*
 * Extract a volume list
 */
static
void
extract_volumes(struct hammer_mount_info *info, char **av, int ac)
{
        int idx = 0;
        int arymax = 32;
        char **ary, *ptr, *next, *orig;

#define _extend_ary(ary, arymax) ({     \
                (arymax) += 32;         \
                realloc(ary, (arymax) * sizeof(char *)); \
        })
        ary = calloc(arymax, sizeof(char *));

        while (ac) {
                if (idx == arymax)
                        ary = _extend_ary(ary, arymax);
                if (strchr(*av, ':') == NULL) {
                        ary[idx++] = strdup(*av);
                } else {
                        orig = next = strdup(*av);
                        while ((ptr = next) != NULL) {
                                if (idx == arymax)
                                        ary = _extend_ary(ary, arymax);
                                if ((next = strchr(ptr, ':')) != NULL)
                                        *next++ = 0;
                                ary[idx++] = strdup(ptr);
                        }
                        free(orig);
                }
                --ac;
                ++av;
        }
        info->nvolumes = idx;
        info->volumes = ary;
}

static
void
free_volumes(struct hammer_mount_info *info)
{
        int i;

        for (i = 0; i < info->nvolumes; i++)
                free(info->volumes[i]);
        free(info->volumes);
}

static
void
usage(void)
{
        fprintf(stderr, "usage: mount_hammer [-o options] [-T transaction-id] "
                        "special ... node\n");
        fprintf(stderr, "       mount_hammer [-o options] [-T transaction-id] "
                        "special[:special]* node\n");
        fprintf(stderr, "       mount_hammer -u [-o options] node\n");
        exit(1);
}