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 FAST_FUNC 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->ah_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->ah_flags & ARCHIVE_EXTRACT_UNCONDITIONAL) {
  23                 /* Remove the entry if it exists */
  24                 if ((!S_ISDIR(file_header->mode))
  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->ah_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->ah_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->ah_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)
  81                          && (errno != EISDIR) /* btw, Linux doesn't return this */
  82                          && (errno != EEXIST)
  83                          && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
  84                         ) {
  85                                 bb_perror_msg("cannot make dir %s", file_header->name);
  86                         }
  87                         break;
  88                 case S_IFLNK:
  89                         /* Symlink */
  90                         res = symlink(file_header->link_target, file_header->name);
  91                         if ((res == -1)
  92                          && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
  93                         ) {
  94                                 bb_perror_msg("cannot create %slink "
  95                                         "from %s to %s", "sym",
  96                                         file_header->name,
  97                                         file_header->link_target);
  98                         }
  99                         break;
 100                 case S_IFSOCK:
 101                 case S_IFBLK:
 102                 case S_IFCHR:
 103                 case S_IFIFO:
 104                         res = mknod(file_header->name, file_header->mode, file_header->device);
 105                         if ((res == -1)
 106                          && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
 107                         ) {
 108                                 bb_perror_msg("cannot create node %s", file_header->name);
 109                         }
 110                         break;
 111                 default:
 112                         bb_error_msg_and_die("unrecognized file type");
 113                 }
 114         }
 115
 116         if (!(archive_handle->ah_flags & ARCHIVE_NOPRESERVE_OWN)) {
 117 #if ENABLE_FEATURE_TAR_UNAME_GNAME
 118                 if (!(archive_handle->ah_flags & ARCHIVE_NUMERIC_OWNER)) {
 119                         uid_t uid = file_header->uid;
 120                         gid_t gid = file_header->gid;
 121
 122                         if (file_header->uname) {
 123                                 struct passwd *pwd = getpwnam(file_header->uname);
 124                                 if (pwd) uid = pwd->pw_uid;
 125                         }
 126                         if (file_header->gname) {
 127                                 struct group *grp = getgrnam(file_header->gname);
 128                                 if (grp) gid = grp->gr_gid;
 129                         }
 130                         lchown(file_header->name, uid, gid);
 131                 } else
 132 #endif
 133                         lchown(file_header->name, file_header->uid, file_header->gid);
 134         }
 135         if (S_ISLNK(file_header->mode)) {
 136                 /* uclibc has no lchmod, glibc is even stranger -
 137                  * it has lchmod which seems to do nothing!
 138                  * so we use chmod... */
 139                 if (!(archive_handle->ah_flags & ARCHIVE_NOPRESERVE_PERM)) {
 140                         chmod(file_header->name, file_header->mode);
 141                 }
 142                 /* same for utime */
 143                 if (archive_handle->ah_flags & ARCHIVE_PRESERVE_DATE) {
 144                         struct utimbuf t;
 145                         t.actime = t.modtime = file_header->mtime;
 146                         utime(file_header->name, &t);
 147                 }
 148         }
 149 }