git.maemo.org Git - busybox4maemo/blob - 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 %s",
  29                                         file_header->name);
  30                 }
  31         }
  32         else if (archive_handle->flags & ARCHIVE_EXTRACT_NEWER) {
  33                 /* Remove the existing entry if its older than the extracted entry */
  34                 struct stat statbuf;
  35                 if (lstat(file_header->name, &statbuf) == -1) {
  36                         if (errno != ENOENT) {
  37                                 bb_perror_msg_and_die("cannot stat old file");
  38                         }
  39                 }
  40                 else if (statbuf.st_mtime <= file_header->mtime) {
  41                         if (!(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
  42                                 bb_error_msg("%s not created: newer or "
  43                                         "same age file exists", file_header->name);
  44                         }
  45                         data_skip(archive_handle);
  46                         return;
  47                 }
  48                 else if ((unlink(file_header->name) == -1) && (errno != EISDIR)) {
  49                         bb_perror_msg_and_die("cannot remove old file %s",
  50                                         file_header->name);
  51                 }
  52         }
  53
  54         /* Handle hard links separately
  55          * We identified hard links as regular files of size 0 with a symlink */
  56         if (S_ISREG(file_header->mode) && (file_header->link_target)
  57          && (file_header->size == 0)
  58         ) {
  59                 /* hard link */
  60                 res = link(file_header->link_target, file_header->name);
  61                 if ((res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
  62                         bb_perror_msg("cannot create %slink "
  63                                         "from %s to %s", "hard",
  64                                         file_header->name,
  65                                         file_header->link_target);
  66                 }
  67         } else {
  68                 /* Create the filesystem entry */
  69                 switch (file_header->mode & S_IFMT) {
  70                 case S_IFREG: {
  71                         /* Regular file */
  72                         dst_fd = xopen3(file_header->name, O_WRONLY | O_CREAT | O_EXCL,
  73                                                         file_header->mode);
  74                         bb_copyfd_exact_size(archive_handle->src_fd, dst_fd, file_header->size);
  75                         close(dst_fd);
  76                         break;
  77                 }
  78                 case S_IFDIR:
  79                         res = mkdir(file_header->name, file_header->mode);
  80                         if ((res == -1) && (errno != EISDIR)
  81                          && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)
  82                         ) {
  83                                 bb_perror_msg("cannot make dir %s", file_header->name);
  84                         }
  85                         break;
  86                 case S_IFLNK:
  87                         /* Symlink */
  88                         res = symlink(file_header->link_target, file_header->name);
  89                         if ((res == -1)
  90                          && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)
  91                         ) {
  92                                 bb_perror_msg("cannot create %slink "
  93                                         "from %s to %s", "sym",
  94                                         file_header->name,
  95                                         file_header->link_target);
  96                         }
  97                         break;
  98                 case S_IFSOCK:
  99                 case S_IFBLK:
 100                 case S_IFCHR:
 101                 case S_IFIFO:
 102                         res = mknod(file_header->name, file_header->mode, file_header->device);
 103                         if ((res == -1)
 104                          && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)
 105                         ) {
 106                                 bb_perror_msg("cannot create node %s", file_header->name);
 107                         }
 108                         break;
 109                 default:
 110                         bb_error_msg_and_die("unrecognized file type");
 111                 }
 112         }
 113
 114         if (!(archive_handle->flags & ARCHIVE_NOPRESERVE_OWN)) {
 115 #if ENABLE_FEATURE_TAR_UNAME_GNAME
 116                 uid_t uid = file_header->uid;
 117                 gid_t gid = file_header->gid;
 118
 119                 if (file_header->uname) {
 120                         struct passwd *pwd = getpwnam(file_header->uname);
 121                         if (pwd) uid = pwd->pw_uid;
 122                 }
 123                 if (file_header->gname) {
 124                         struct group *grp = getgrnam(file_header->gname);
 125                         if (grp) gid = grp->gr_gid;
 126                 }
 127                 lchown(file_header->name, uid, gid);
 128 #else
 129                 lchown(file_header->name, file_header->uid, file_header->gid);
 130 #endif
 131         }
 132         if ((file_header->mode & S_IFMT) != S_IFLNK) {
 133                 /* uclibc has no lchmod, glibc is even stranger -
 134                  * it has lchmod which seems to do nothing!
 135                  * so we use chmod... */
 136                 if (!(archive_handle->flags & ARCHIVE_NOPRESERVE_PERM)) {
 137                         chmod(file_header->name, file_header->mode);
 138                 }
 139                 /* same for utime */
 140                 if (archive_handle->flags & ARCHIVE_PRESERVE_DATE) {
 141                         struct utimbuf t;
 142                         t.actime = t.modtime = file_header->mtime;
 143                         utime(file_header->name, &t);
 144                 }
 145         }
 146 }