source: MondoRescue/trunk/mindi-busybox/archival/libunarchive/data_extract_all.c@ 1138

/*
 *  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 2 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, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <sys/types.h>

#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <utime.h>
#include <unistd.h>
#include <stdlib.h>

#include "libbb.h"
#include "unarchive.h"

void data_extract_all(archive_handle_t *archive_handle)
{
    file_header_t *file_header = archive_handle->file_header;
    int dst_fd;
    int res;

    if (archive_handle->flags & ARCHIVE_CREATE_LEADING_DIRS) {
        char *name = bb_xstrdup(file_header->name);
        bb_make_directory (dirname(name), -1, FILEUTILS_RECUR);
        free(name);
    }

    /* Check if the file already exists */
    if (archive_handle->flags & ARCHIVE_EXTRACT_UNCONDITIONAL) {
        /* Remove the existing entry if it exists */
        if (((file_header->mode & S_IFMT) != S_IFDIR) && (unlink(file_header->name) == -1) && (errno != ENOENT)) {
            bb_perror_msg_and_die("Couldnt remove old file");
        }
    }
    else if (archive_handle->flags & ARCHIVE_EXTRACT_NEWER) {
        /* Remove the existing entry if its older than the extracted entry */
        struct stat statbuf;
        if (lstat(file_header->name, &statbuf) == -1) {
            if (errno != ENOENT) {
                bb_perror_msg_and_die("Couldnt stat old file");
            }
        }
        else if (statbuf.st_mtime <= file_header->mtime) {
            if (!(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
                bb_error_msg("%s not created: newer or same age file exists", file_header->name);
            }
            data_skip(archive_handle);
            return;
        }
        else if ((unlink(file_header->name) == -1) && (errno != EISDIR)) {
            bb_perror_msg_and_die("Couldnt remove old file %s", file_header->name);
        }
    }

    /* Handle hard links separately
     * We identified hard links as regular files of size 0 with a symlink */
    if (S_ISREG(file_header->mode) && (file_header->link_name) && (file_header->size == 0)) {
        /* hard link */
        res = link(file_header->link_name, file_header->name);
        if ((res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
            bb_perror_msg("Couldnt create hard link");
        }
    } else {
        /* Create the filesystem entry */
        switch(file_header->mode & S_IFMT) {
            case S_IFREG: {
                /* Regular file */
                dst_fd = bb_xopen(file_header->name, O_WRONLY | O_CREAT | O_EXCL);
                bb_copyfd_size(archive_handle->src_fd, dst_fd, file_header->size);
                close(dst_fd);
                break;
                }
            case S_IFDIR:
                res = mkdir(file_header->name, file_header->mode);
                if ((errno != EISDIR) && (res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
                    bb_perror_msg("extract_archive: %s", file_header->name);
                }
                break;
            case S_IFLNK:
                /* Symlink */
                res = symlink(file_header->link_name, file_header->name);
                if ((res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
                    bb_perror_msg("Cannot create symlink from %s to '%s'", file_header->name, file_header->link_name);
                }
                break;
            case S_IFSOCK:
            case S_IFBLK:
            case S_IFCHR:
            case S_IFIFO:
                res = mknod(file_header->name, file_header->mode, file_header->device);
                if ((res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
                    bb_perror_msg("Cannot create node %s", file_header->name);
                }
                break;
            default:
                bb_error_msg_and_die("Unrecognised file type");
        }
    }

    if (!(archive_handle->flags & ARCHIVE_NOPRESERVE_OWN)) {
        lchown(file_header->name, file_header->uid, file_header->gid);
    }
    if (!(archive_handle->flags & ARCHIVE_NOPRESERVE_PERM) &&
         (file_header->mode & S_IFMT) != S_IFLNK)
    {
        chmod(file_header->name, file_header->mode);
    }

    if (archive_handle->flags & ARCHIVE_PRESERVE_DATE) {
        struct utimbuf t;
        t.actime = t.modtime = file_header->mtime;
        utime(file_header->name, &t);
    }
}