archival/libunarchive/data_extract_all.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  *  This program is free software; you can redistribute it and/or modify
   4  *  it under the terms of the GNU General Public License as published by
   5  *  the Free Software Foundation; either version 2 of the License, or
   6  *  (at your option) any later version.
   7  *
   8  *  This program is distributed in the hope that it will be useful,
   9  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *  GNU General Public License for more details.
  12  *
  13  *  You should have received a copy of the GNU General Public License
  14  *  along with this program; if not, write to the Free Software
  15  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  16  */
  17
  18 #include <sys/types.h>
  19
  20 #include <errno.h>
  21 #include <fcntl.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <utime.h>
  25 #include <unistd.h>
  26 #include <stdlib.h>
  27
  28 #include "libbb.h"
  29 #include "unarchive.h"
  30
  31 void data_extract_all(archive_handle_t *archive_handle)
  32 {
  33         file_header_t *file_header = archive_handle->file_header;
  34         int dst_fd;
  35         int res;
  36
  37         if (archive_handle->flags & ARCHIVE_CREATE_LEADING_DIRS) {
  38                 char *name = bb_xstrdup(file_header->name);
  39                 bb_make_directory (dirname(name), -1, FILEUTILS_RECUR);
  40                 free(name);
  41         }
  42
  43         /* Check if the file already exists */
  44         if (archive_handle->flags & ARCHIVE_EXTRACT_UNCONDITIONAL) {
  45                 /* Remove the existing entry if it exists */
  46                 if (((file_header->mode & S_IFMT) != S_IFDIR) && (unlink(file_header->name) == -1) && (errno != ENOENT)) {
  47                         bb_perror_msg_and_die("Couldnt remove old file");
  48                 }
  49         }
  50         else if (archive_handle->flags & ARCHIVE_EXTRACT_NEWER) {
  51                 /* Remove the existing entry if its older than the extracted entry */
  52                 struct stat statbuf;
  53                 if (lstat(file_header->name, &statbuf) == -1) {
  54                         if (errno != ENOENT) {
  55                                 bb_perror_msg_and_die("Couldnt stat old file");
  56                         }
  57                 }
  58                 else if (statbuf.st_mtime <= file_header->mtime) {
  59                         if (!(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
  60                                 bb_error_msg("%s not created: newer or same age file exists", file_header->name);
  61                         }
  62                         data_skip(archive_handle);
  63                         return;
  64                 }
  65                 else if ((unlink(file_header->name) == -1) && (errno != EISDIR)) {
  66                         bb_perror_msg_and_die("Couldnt remove old file %s", file_header->name);
  67                 }
  68         }
  69
  70         /* Handle hard links separately
  71          * We identified hard links as regular files of size 0 with a symlink */
  72         if (S_ISREG(file_header->mode) && (file_header->link_name) && (file_header->size == 0)) {
  73                 /* hard link */
  74                 res = link(file_header->link_name, file_header->name);
  75                 if ((res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
  76                         bb_perror_msg("Couldnt create hard link");
  77                 }
  78         } else {
  79                 /* Create the filesystem entry */
  80                 switch(file_header->mode & S_IFMT) {
  81                         case S_IFREG: {
  82                                 /* Regular file */
  83                                 dst_fd = bb_xopen(file_header->name, O_WRONLY | O_CREAT | O_EXCL);
  84                                 bb_copyfd_size(archive_handle->src_fd, dst_fd, file_header->size);
  85                                 close(dst_fd);
  86                                 break;
  87                                 }
  88                         case S_IFDIR:
  89                                 res = mkdir(file_header->name, file_header->mode);
  90                                 if ((errno != EISDIR) && (res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
  91                                         bb_perror_msg("extract_archive: %s", file_header->name);
  92                                 }
  93                                 break;
  94                         case S_IFLNK:
  95                                 /* Symlink */
  96                                 res = symlink(file_header->link_name, file_header->name);
  97                                 if ((res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
  98                                         bb_perror_msg("Cannot create symlink from %s to '%s'", file_header->name, file_header->link_name);
  99                                 }
 100                                 break;
 101                         case S_IFSOCK:
 102                         case S_IFBLK:
 103                         case S_IFCHR:
 104                         case S_IFIFO:
 105                                 res = mknod(file_header->name, file_header->mode, file_header->device);
 106                                 if ((res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
 107                                         bb_perror_msg("Cannot create node %s", file_header->name);
 108                                 }
 109                                 break;
 110                         default:
 111                                 bb_error_msg_and_die("Unrecognised file type");
 112                 }
 113         }
 114
 115         if (!(archive_handle->flags & ARCHIVE_NOPRESERVE_OWN)) {
 116                 lchown(file_header->name, file_header->uid, file_header->gid);
 117         }
 118         if (!(archive_handle->flags & ARCHIVE_NOPRESERVE_PERM) &&
 119                  (file_header->mode & S_IFMT) != S_IFLNK)
 120         {
 121                 chmod(file_header->name, file_header->mode);
 122         }
 123
 124         if (archive_handle->flags & ARCHIVE_PRESERVE_DATE) {
 125                 struct utimbuf t;
 126                 t.actime = t.modtime = file_header->mtime;
 127                 utime(file_header->name, &t);
 128         }
 129 }