/*
 * Copyright (c) 2015 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Antonio Huete <tuxillo@quantumachine.net>
 * 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.
 */
/*
 * Backwards compatibility functions with prior HAMMER versions
 */

#include <stdio.h>
#include <string.h>
#include <dirent.h>
#include <stdlib.h>

#include <sys/types.h>
#include <sys/stat.h>

#include "libhammer.h"

void
libhammer_compat_old_snapcount(libhammer_pfsinfo_t pip)
{

        struct dirent *den;
        struct stat st;
        char *snapshots_path, *fpath;
        int spallocated = 0;
        DIR *dir;

        /*
         * XXX old style: count the number of softlinks in the snapshots dir
         *
         * The problem with this approach, which is the original one from
         * hammer(8), is that only the snapshots in the 'snapshots' directory
         * (or any other specified for a PFS) are taken in account and this
         * assumes that 'hammer cleanup' has run at least once.
         * A more correct solution would be using glob(3) to find the
         * snap-* files in the 'snapshots' directory among other places.
         */
        if (pip->snapshots[0]) {
                snapshots_path = pip->snapshots;
        } else {
                asprintf(&snapshots_path, "%s/snapshots", pip->mountedon);
                spallocated = 1;
        }
        if ((dir = opendir(snapshots_path)) != NULL) {
                while ((den = readdir(dir)) != NULL) {
                        if (den->d_name[0] == '.')
                                continue;
                        asprintf(&fpath, "%s/%s", snapshots_path,
                            den->d_name);
                        if (lstat(fpath, &st) == 0 &&
                            S_ISLNK(st.st_mode))
                                pip->snapcount++;
                        free(fpath);
                }
                closedir(dir);
        }
        if (spallocated)
                free(snapshots_path);

}