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bpc_dirOps.c  view on Meta::CPAN

/*
 * Directory and file system operations
 *
 * Copyright (C) 2013 Craig Barratt.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, visit the http://fsf.org website.
 */

#include "backuppc.h"

/*
 * Create all the directories in the given path.  Path must be non-const.  Trailing '/' characters are removed.
 */
int bpc_path_create(char *path)
{
    char *p = path;
    STRUCT_STAT st;
    int levels = 0;

    if ( BPC_LogLevel >= 6 ) bpc_logMsgf("bpc_path_create(%s)\n", path);
    /*
     * check if it exists already
     */
    if ( !stat(path, &st) && S_ISDIR(st.st_mode) ) return 0;

    /*
     * We walk up until we find the deepest level directory that exists.
     * First remove trailing slashes.
     */
    p = path + strlen(path);
    while ( p > path && p[-1] == '/' ) p--;
    if ( *p == '/' ) *p = '\0';
    while ( p > path ) {
        while ( p > path && p[-1] != '/' ) p--;
        while ( p > path && p[-1] == '/' ) p--;
        if ( *p == '/' ) {
            *p = '\0';
            levels++;
            if ( !stat(path, &st) && S_ISDIR(st.st_mode) ) break;
        }
    }
    if ( BPC_LogLevel >= 9 ) bpc_logMsgf("bpc_path_create: found that %s exists (%d levels up)\n", path, levels);

    /*
     * We have removed levels '/' characters from path.  Replace each one and create the directory.
     */
    while ( levels-- > 0 ) {
        p = path + strlen(path);
        *p = '/';
        if ( mkdir(path, ACCESSPERMS) < 0 && errno != EEXIST) {
            bpc_logErrf("bpc_path_create: can't create %s (errno %d)\n", path, errno);
            return -1;
        }
        if ( BPC_LogLevel >= 9 ) bpc_logMsgf("bpc_path_create: created %s\n", path);
    }
    return 0;
}

/*
 * Remove all the files below path (if a directory) and path itself.  Deduct reference counts
 * for every attrib file removed.
 *
 * Note that inodes are *not* updated, even in cases where nlinks > 0.
 */
int bpc_path_remove(bpc_deltaCount_info *deltaInfo, char *path, int compress)
{
    char filePath[BPC_MAXPATHLEN];
    STRUCT_STAT st;
    DIR *dir;