archival/libunarchive/data_extract_all.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
   4  */
   5
   6 #include "libbb.h"
   7 #include "unarchive.h"
   8
   9 void data_extract_all(archive_handle_t *archive_handle)
  10 {
  11         file_header_t *file_header = archive_handle->file_header;
  12         int dst_fd;
  13         int res;
  14
  15         if (archive_handle->flags & ARCHIVE_CREATE_LEADING_DIRS) {
  16                 char *name = xstrdup(file_header->name);
  17                 bb_make_directory(dirname(name), -1, FILEUTILS_RECUR);
  18                 free(name);
  19         }
  20
  21         /* Check if the file already exists */
  22         if (archive_handle->flags & ARCHIVE_EXTRACT_UNCONDITIONAL) {
  23                 /* Remove the existing entry if it exists */
  24                 if (((file_header->mode & S_IFMT) != S_IFDIR)
  25                  && (unlink(file_header->name) == -1)
  26                  && (errno != ENOENT)
  27                 ) {
  28                         bb_perror_msg_and_die("cannot remove old file");
  29                 }
  30         }
  31         else if (archive_handle->flags & ARCHIVE_EXTRACT_NEWER) {
  32                 /* Remove the existing entry if its older than the extracted entry */
  33                 struct stat statbuf;
  34                 if (lstat(file_header->name, &statbuf) == -1) {
  35                         if (errno != ENOENT) {
  36                                 bb_perror_msg_and_die("cannot stat old file");
  37                         }
  38                 }
  39                 else if (statbuf.st_mtime <= file_header->mtime) {
  40                         if (!(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
  41                                 bb_error_msg("%s not created: newer or "
  42                                         "same age file exists", file_header->name);
  43                         }
  44                         data_skip(archive_handle);
  45                         return;
  46                 }
  47                 else if ((unlink(file_header->name) == -1) && (errno != EISDIR)) {
  48                         bb_perror_msg_and_die("cannot remove old file %s",
  49                                         file_header->name);
  50                 }
  51         }
  52
  53         /* Handle hard links separately
  54          * We identified hard links as regular files of size 0 with a symlink */
  55         if (S_ISREG(file_header->mode) && (file_header->link_name)
  56          && (file_header->size == 0)
  57         ) {
  58                 /* hard link */
  59                 res = link(file_header->link_name, file_header->name);
  60                 if ((res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
  61                         bb_perror_msg("cannot create hard link");
  62                 }
  63         } else {
  64                 /* Create the filesystem entry */
  65                 switch (file_header->mode & S_IFMT) {
  66                 case S_IFREG: {
  67                         /* Regular file */
  68                         dst_fd = xopen3(file_header->name, O_WRONLY | O_CREAT | O_EXCL,
  69                                                         file_header->mode);
  70                         bb_copyfd_size(archive_handle->src_fd, dst_fd, file_header->size);
  71                         close(dst_fd);
  72                         break;
  73                         }
  74                 case S_IFDIR:
  75                         res = mkdir(file_header->name, file_header->mode);
  76                         if ((errno != EISDIR) && (res == -1)
  77                          && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)
  78                         ) {
  79                                 bb_perror_msg("extract_archive: %s", file_header->name);
  80                         }
  81                         break;
  82                 case S_IFLNK:
  83                         /* Symlink */
  84                         res = symlink(file_header->link_name, file_header->name);
  85                         if ((res == -1)
  86                          && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)
  87                         ) {
  88                                 bb_perror_msg("cannot create symlink "
  89                                         "from %s to '%s'",
  90                                         file_header->name,
  91                                         file_header->link_name);
  92                         }
  93                         break;
  94                 case S_IFSOCK:
  95                 case S_IFBLK:
  96                 case S_IFCHR:
  97                 case S_IFIFO:
  98                         res = mknod(file_header->name, file_header->mode, file_header->device);
  99                         if ((res == -1)
 100                          && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)
 101                         ) {
 102                                 bb_perror_msg("cannot create node %s", file_header->name);
 103                         }
 104                         break;
 105                 default:
 106                         bb_error_msg_and_die("unrecognized file type");
 107                 }
 108         }
 109
 110         if (!(archive_handle->flags & ARCHIVE_NOPRESERVE_OWN)) {
 111                 lchown(file_header->name, file_header->uid, file_header->gid);
 112         }
 113
 114         if (archive_handle->flags & ARCHIVE_PRESERVE_DATE) {
 115                 struct utimbuf t;
 116                 t.actime = t.modtime = file_header->mtime;
 117                 utime(file_header->name, &t);
 118         }
 119 }