1 /* Extract files from a tar archive.
3 Copyright (C) 1988, 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000,
4 2001, 2003, 2004 Free Software Foundation, Inc.
6 Written by John Gilmore, on 1985-11-19.
8 This program is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by the
10 Free Software Foundation; either version 2, or (at your option) any later
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
16 Public License for more details.
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
39 bool we_are_root
; /* true if our effective uid == 0 */
40 static mode_t newdir_umask
; /* umask when creating new directories */
41 static mode_t current_umask
; /* current umask (which is set to 0 if -p) */
43 /* Status of the permissions of a file that we are extracting. */
46 /* This file may have existed already; its permissions are unknown. */
49 /* This file was created using the permissions from the archive. */
52 /* This is an intermediate directory; the archive did not specify
57 /* List of directories whose statuses we need to extract after we've
58 finished extracting their subsidiary files. If you consider each
59 contiguous subsequence of elements of the form [D]?[^D]*, where [D]
60 represents an element where AFTER_SYMLINKS is nonzero and [^D]
61 represents an element where AFTER_SYMLINKS is zero, then the head
62 of the subsequence has the longest name, and each non-head element
63 in the prefix is an ancestor (in the directory hierarchy) of the
66 struct delayed_set_stat
68 struct delayed_set_stat
*next
;
69 struct stat stat_info
;
71 mode_t invert_permissions
;
72 enum permstatus permstatus
;
77 static struct delayed_set_stat
*delayed_set_stat_head
;
79 /* List of symbolic links whose creation we have delayed. */
80 struct delayed_symlink
82 /* The next delayed symbolic link in the list. */
83 struct delayed_symlink
*next
;
85 /* The device, inode number and last-modified time of the placeholder. */
90 /* The desired owner and group of the symbolic link. */
94 /* A list of sources for this symlink. The sources are all to be
95 hard-linked together. */
96 struct string_list
*sources
;
98 /* The desired target of the desired link. */
102 static struct delayed_symlink
*delayed_symlink_head
;
106 struct string_list
*next
;
110 /* Set up to extract files. */
114 we_are_root
= geteuid () == 0;
115 same_permissions_option
+= we_are_root
;
116 same_owner_option
+= we_are_root
;
118 /* Save 'root device' to avoid purging mount points.
119 FIXME: Should the same be done after handling -C option ? */
120 if (one_file_system_option
)
123 char *dir
= xgetcwd ();
125 if (deref_stat (true, dir
, &st
))
128 root_device
= st
.st_dev
;
131 /* Option -p clears the kernel umask, so it does not affect proper
132 restoration of file permissions. New intermediate directories will
133 comply with umask at start of program. */
135 newdir_umask
= umask (0);
136 if (0 < same_permissions_option
)
140 umask (newdir_umask
); /* restore the kernel umask */
141 current_umask
= newdir_umask
;
145 /* If restoring permissions, restore the mode for FILE_NAME from
146 information given in *STAT_INFO (where *CUR_INFO gives
147 the current status if CUR_INFO is nonzero); otherwise invert the
148 INVERT_PERMISSIONS bits from the file's current permissions.
149 PERMSTATUS specifies the status of the file's permissions.
150 TYPEFLAG specifies the type of the file. */
152 set_mode (char const *file_name
,
153 struct stat
const *stat_info
,
154 struct stat
const *cur_info
,
155 mode_t invert_permissions
, enum permstatus permstatus
,
160 if (0 < same_permissions_option
161 && permstatus
!= INTERDIR_PERMSTATUS
)
163 mode
= stat_info
->st_mode
;
165 /* If we created the file and it has a usual mode, then its mode
166 is normally set correctly already. But on many hosts, some
167 directories inherit the setgid bits from their parents, so we
168 we must set directories' modes explicitly. */
169 if (permstatus
== ARCHIVED_PERMSTATUS
170 && ! (mode
& ~ MODE_RWX
)
171 && typeflag
!= DIRTYPE
172 && typeflag
!= GNUTYPE_DUMPDIR
)
175 else if (! invert_permissions
)
179 /* We must inspect a directory's current permissions, since the
180 directory may have inherited its setgid bit from its parent.
182 INVERT_PERMISSIONS happens to be nonzero only for directories
183 that we created, so there's no point optimizing this code for
188 if (stat (file_name
, &st
) != 0)
190 stat_error (file_name
);
195 mode
= cur_info
->st_mode
^ invert_permissions
;
198 if (chmod (file_name
, mode
) != 0)
199 chmod_error_details (file_name
, mode
);
202 /* Check time after successfully setting FILE_NAME's time stamp to T. */
204 check_time (char const *file_name
, time_t t
)
208 WARN ((0, 0, _("%s: implausibly old time stamp %s"),
209 file_name
, tartime (t
)));
210 else if (start_time
< t
&& (now
= time (0)) < t
)
211 WARN ((0, 0, _("%s: time stamp %s is %lu s in the future"),
212 file_name
, tartime (t
), (unsigned long) (t
- now
)));
215 /* Restore stat attributes (owner, group, mode and times) for
216 FILE_NAME, using information given in *STAT_INFO.
217 If CUR_INFO is nonzero, *CUR_INFO is the
218 file's currernt status.
219 If not restoring permissions, invert the
220 INVERT_PERMISSIONS bits from the file's current permissions.
221 PERMSTATUS specifies the status of the file's permissions.
222 TYPEFLAG specifies the type of the file. */
224 /* FIXME: About proper restoration of symbolic link attributes, we still do
225 not have it right. Pretesters' reports tell us we need further study and
226 probably more configuration. For now, just use lchown if it exists, and
227 punt for the rest. Sigh! */
230 set_stat (char const *file_name
,
231 struct stat
const *stat_info
,
232 struct stat
const *cur_info
,
233 mode_t invert_permissions
, enum permstatus permstatus
,
236 struct utimbuf utimbuf
;
238 if (typeflag
!= SYMTYPE
)
240 /* We do the utime before the chmod because some versions of utime are
241 broken and trash the modes of the file. */
243 if (! touch_option
&& permstatus
!= INTERDIR_PERMSTATUS
)
245 /* We set the accessed time to `now', which is really the time we
246 started extracting files, unless incremental_option is used, in
247 which case .st_atime is used. */
249 /* FIXME: incremental_option should set ctime too, but how? */
251 if (incremental_option
)
252 utimbuf
.actime
= stat_info
->st_atime
;
254 utimbuf
.actime
= start_time
;
256 utimbuf
.modtime
= stat_info
->st_mtime
;
258 if (utime (file_name
, &utimbuf
) < 0)
259 utime_error (file_name
);
262 check_time (file_name
, utimbuf
.actime
);
263 check_time (file_name
, utimbuf
.modtime
);
267 /* Some systems allow non-root users to give files away. Once this
268 done, it is not possible anymore to change file permissions, so we
269 have to set permissions prior to possibly giving files away. */
271 set_mode (file_name
, stat_info
, cur_info
,
272 invert_permissions
, permstatus
, typeflag
);
275 if (0 < same_owner_option
&& permstatus
!= INTERDIR_PERMSTATUS
)
277 /* When lchown exists, it should be used to change the attributes of
278 the symbolic link itself. In this case, a mere chown would change
279 the attributes of the file the symbolic link is pointing to, and
280 should be avoided. */
282 if (typeflag
== SYMTYPE
)
285 if (lchown (file_name
, stat_info
->st_uid
, stat_info
->st_gid
) < 0)
286 chown_error_details (file_name
,
287 stat_info
->st_uid
, stat_info
->st_gid
);
292 if (chown (file_name
, stat_info
->st_uid
, stat_info
->st_gid
) < 0)
293 chown_error_details (file_name
,
294 stat_info
->st_uid
, stat_info
->st_gid
);
296 /* On a few systems, and in particular, those allowing to give files
297 away, changing the owner or group destroys the suid or sgid bits.
298 So let's attempt setting these bits once more. */
299 if (stat_info
->st_mode
& (S_ISUID
| S_ISGID
| S_ISVTX
))
300 set_mode (file_name
, stat_info
, 0,
301 invert_permissions
, permstatus
, typeflag
);
306 /* Remember to restore stat attributes (owner, group, mode and times)
307 for the directory FILE_NAME, using information given in *STAT_INFO,
308 once we stop extracting files into that directory.
309 If not restoring permissions, remember to invert the
310 INVERT_PERMISSIONS bits from the file's current permissions.
311 PERMSTATUS specifies the status of the file's permissions. */
313 delay_set_stat (char const *file_name
, struct stat
const *stat_info
,
314 mode_t invert_permissions
, enum permstatus permstatus
)
316 size_t file_name_len
= strlen (file_name
);
317 struct delayed_set_stat
*data
=
318 xmalloc (offsetof (struct delayed_set_stat
, file_name
)
319 + file_name_len
+ 1);
320 data
->file_name_len
= file_name_len
;
321 strcpy (data
->file_name
, file_name
);
322 data
->invert_permissions
= invert_permissions
;
323 data
->permstatus
= permstatus
;
324 data
->after_symlinks
= 0;
325 data
->stat_info
= *stat_info
;
326 data
->next
= delayed_set_stat_head
;
327 delayed_set_stat_head
= data
;
330 /* Update the delayed_set_stat info for an intermediate directory
331 created within the file name of DIR. The intermediate directory turned
332 out to be the same as this directory, e.g. due to ".." or symbolic
333 links. *DIR_STAT_INFO is the status of the directory. */
335 repair_delayed_set_stat (char const *dir
,
336 struct stat
const *dir_stat_info
)
338 struct delayed_set_stat
*data
;
339 for (data
= delayed_set_stat_head
; data
; data
= data
->next
)
342 if (stat (data
->file_name
, &st
) != 0)
344 stat_error (data
->file_name
);
348 if (st
.st_dev
== dir_stat_info
->st_dev
349 && st
.st_ino
== dir_stat_info
->st_ino
)
351 data
->stat_info
= current_stat_info
.stat
;
352 data
->invert_permissions
=
353 (MODE_RWX
& (current_stat_info
.stat
.st_mode
^ st
.st_mode
));
354 data
->permstatus
= ARCHIVED_PERMSTATUS
;
359 ERROR ((0, 0, _("%s: Unexpected inconsistency when making directory"),
360 quotearg_colon (dir
)));
363 /* After a file/link/symlink/directory creation has failed, see if
364 it's because some required directory was not present, and if so,
365 create all required directories. Return non-zero if a directory
368 make_directories (char *file_name
)
370 char *cursor0
= file_name
+ FILE_SYSTEM_PREFIX_LEN (file_name
);
371 char *cursor
; /* points into the file name */
372 int did_something
= 0; /* did we do anything yet? */
374 int invert_permissions
;
378 for (cursor
= cursor0
; *cursor
; cursor
++)
380 if (! ISSLASH (*cursor
))
383 /* Avoid mkdir of empty string, if leading or double '/'. */
385 if (cursor
== cursor0
|| ISSLASH (cursor
[-1]))
388 /* Avoid mkdir where last part of file name is "." or "..". */
390 if (cursor
[-1] == '.'
391 && (cursor
== cursor0
+ 1 || ISSLASH (cursor
[-2])
392 || (cursor
[-2] == '.'
393 && (cursor
== cursor0
+ 2 || ISSLASH (cursor
[-3])))))
396 *cursor
= '\0'; /* truncate the name there */
397 mode
= MODE_RWX
& ~ newdir_umask
;
398 invert_permissions
= we_are_root
? 0 : MODE_WXUSR
& ~ mode
;
399 status
= mkdir (file_name
, mode
^ invert_permissions
);
403 /* Create a struct delayed_set_stat even if
404 invert_permissions is zero, because
405 repair_delayed_set_stat may need to update the struct. */
406 delay_set_stat (file_name
,
407 ¤t_stat_info
.stat
/* ignored */,
408 invert_permissions
, INTERDIR_PERMSTATUS
);
410 print_for_mkdir (file_name
, cursor
- file_name
, mode
);
420 continue; /* Directory already exists. */
421 else if ((errno
== ENOSYS
/* Automounted dirs on Solaris return
422 this. Reported by Warren Hyde
423 <Warren.Hyde@motorola.com> */
424 || ERRNO_IS_EACCES
) /* Turbo C mkdir gives a funny errno. */
425 && access (file_name
, W_OK
) == 0)
428 /* Some other error in the mkdir. We return to the caller. */
432 return did_something
; /* tell them to retry if we made one */
436 file_newer_p (const char *file_name
, struct tar_stat_info
*tar_stat
)
440 if (stat (file_name
, &st
))
442 stat_warn (file_name
);
443 return true; /* Be on the safe side */
445 if (!S_ISDIR (st
.st_mode
)
446 && st
.st_mtime
>= tar_stat
->stat
.st_mtime
)
453 /* Prepare to extract a file.
454 Return zero if extraction should not proceed. */
457 prepare_to_extract (char const *file_name
)
459 if (to_stdout_option
)
462 switch (old_files_option
)
464 case UNLINK_FIRST_OLD_FILES
:
465 if (!remove_any_file (file_name
,
466 recursive_unlink_option
? RECURSIVE_REMOVE_OPTION
467 : ORDINARY_REMOVE_OPTION
)
468 && errno
&& errno
!= ENOENT
)
470 unlink_error (file_name
);
475 case KEEP_NEWER_FILES
:
476 if (file_newer_p (file_name
, ¤t_stat_info
))
478 WARN ((0, 0, _("Current %s is newer"), quote (file_name
)));
490 /* Attempt repairing what went wrong with the extraction. Delete an
491 already existing file or create missing intermediate directories.
492 Return nonzero if we somewhat increased our chances at a successful
493 extraction. errno is properly restored on zero return. */
495 maybe_recoverable (char *file_name
, int *interdir_made
)
505 /* Remove an old file, if the options allow this. */
507 switch (old_files_option
)
512 case KEEP_NEWER_FILES
:
513 if (file_newer_p (file_name
, ¤t_stat_info
))
520 case DEFAULT_OLD_FILES
:
521 case NO_OVERWRITE_DIR_OLD_FILES
:
522 case OVERWRITE_OLD_FILES
:
524 int r
= remove_any_file (file_name
, ORDINARY_REMOVE_OPTION
);
529 case UNLINK_FIRST_OLD_FILES
:
534 /* Attempt creating missing intermediate directories. */
535 if (! make_directories (file_name
))
544 /* Just say we can't do anything about it... */
550 /* Fix the statuses of all directories whose statuses need fixing, and
551 which are not ancestors of FILE_NAME. If AFTER_SYMLINKS is
552 nonzero, do this for all such directories; otherwise, stop at the
553 first directory that is marked to be fixed up only after delayed
554 symlinks are applied. */
556 apply_nonancestor_delayed_set_stat (char const *file_name
, bool after_symlinks
)
558 size_t file_name_len
= strlen (file_name
);
559 bool check_for_renamed_directories
= 0;
561 while (delayed_set_stat_head
)
563 struct delayed_set_stat
*data
= delayed_set_stat_head
;
564 bool skip_this_one
= 0;
566 struct stat
const *cur_info
= 0;
568 check_for_renamed_directories
|= data
->after_symlinks
;
570 if (after_symlinks
< data
->after_symlinks
571 || (data
->file_name_len
< file_name_len
572 && file_name
[data
->file_name_len
]
573 && (ISSLASH (file_name
[data
->file_name_len
])
574 || ISSLASH (file_name
[data
->file_name_len
- 1]))
575 && memcmp (file_name
, data
->file_name
, data
->file_name_len
) == 0))
578 if (check_for_renamed_directories
)
581 if (stat (data
->file_name
, &st
) != 0)
583 stat_error (data
->file_name
);
586 else if (! (st
.st_dev
== data
->stat_info
.st_dev
587 && (st
.st_ino
== data
->stat_info
.st_ino
)))
590 _("%s: Directory renamed before its status could be extracted"),
591 quotearg_colon (data
->file_name
)));
597 set_stat (data
->file_name
, &data
->stat_info
, cur_info
,
598 data
->invert_permissions
, data
->permstatus
, DIRTYPE
);
600 delayed_set_stat_head
= data
->next
;
607 extract_dir (char *file_name
, int typeflag
)
611 int interdir_made
= 0;
613 if (incremental_option
)
614 /* Read the entry and delete files that aren't listed in the archive. */
615 purge_directory (file_name
);
616 else if (typeflag
== GNUTYPE_DUMPDIR
)
619 mode
= (current_stat_info
.stat
.st_mode
| (we_are_root
? 0 : MODE_WXUSR
)) & MODE_RWX
;
621 status
= prepare_to_extract (file_name
);
626 while ((status
= mkdir (file_name
, mode
)))
630 || old_files_option
== DEFAULT_OLD_FILES
631 || old_files_option
== OVERWRITE_OLD_FILES
))
634 if (stat (file_name
, &st
) == 0)
638 repair_delayed_set_stat (file_name
, &st
);
641 if (S_ISDIR (st
.st_mode
))
643 mode
= st
.st_mode
& ~ current_umask
;
650 if (maybe_recoverable (file_name
, &interdir_made
))
655 mkdir_error (file_name
);
664 || old_files_option
== DEFAULT_OLD_FILES
665 || old_files_option
== OVERWRITE_OLD_FILES
)
666 delay_set_stat (file_name
, ¤t_stat_info
.stat
,
667 MODE_RWX
& (mode
^ current_stat_info
.stat
.st_mode
),
669 ? ARCHIVED_PERMSTATUS
670 : UNKNOWN_PERMSTATUS
));
675 open_output_file (char *file_name
, int typeflag
)
678 int openflag
= (O_WRONLY
| O_BINARY
| O_CREAT
679 | (old_files_option
== OVERWRITE_OLD_FILES
682 mode_t mode
= current_stat_info
.stat
.st_mode
& MODE_RWX
& ~ current_umask
;
685 /* Contiguous files (on the Masscomp) have to specify the size in
686 the open call that creates them. */
688 if (typeflag
== CONTTYPE
)
689 fd
= open (file_name
, openflag
| O_CTG
, mode
, current_stat_info
.stat
.st_size
);
691 fd
= open (file_name
, openflag
, mode
);
693 #else /* not O_CTG */
694 if (typeflag
== CONTTYPE
)
696 static int conttype_diagnosed
;
698 if (!conttype_diagnosed
)
700 conttype_diagnosed
= 1;
701 WARN ((0, 0, _("Extracting contiguous files as regular files")));
704 fd
= open (file_name
, openflag
, mode
);
706 #endif /* not O_CTG */
712 extract_file (char *file_name
, int typeflag
)
716 union block
*data_block
;
720 int interdir_made
= 0;
722 /* FIXME: deal with protection issues. */
726 if (to_stdout_option
)
730 if (! prepare_to_extract (file_name
))
737 fd
= open_output_file (file_name
, typeflag
);
740 while (fd
< 0 && maybe_recoverable (file_name
, &interdir_made
));
744 open_error (file_name
);
751 if (current_stat_info
.is_sparse
)
752 sparse_extract_file (fd
, ¤t_stat_info
, &size
);
754 for (size
= current_stat_info
.stat
.st_size
; size
> 0; )
756 if (multi_volume_option
)
758 assign_string (&save_name
, current_stat_info
.file_name
);
759 save_totsize
= current_stat_info
.stat
.st_size
;
760 save_sizeleft
= size
;
763 /* Locate data, determine max length writeable, write it,
764 block that we have used the data, then check if the write
767 data_block
= find_next_block ();
770 ERROR ((0, 0, _("Unexpected EOF in archive")));
771 break; /* FIXME: What happens, then? */
774 written
= available_space_after (data_block
);
779 count
= full_write (fd
, data_block
->buffer
, written
);
782 set_next_block_after ((union block
*)
783 (data_block
->buffer
+ written
- 1));
784 if (count
!= written
)
786 write_error_details (file_name
, count
, written
);
793 if (multi_volume_option
)
794 assign_string (&save_name
, 0);
796 /* If writing to stdout, don't try to do anything to the filename;
797 it doesn't exist, or we don't want to touch it anyway. */
799 if (to_stdout_option
)
805 close_error (file_name
);
810 set_stat (file_name
, ¤t_stat_info
.stat
, 0, 0,
811 (old_files_option
== OVERWRITE_OLD_FILES
813 : ARCHIVED_PERMSTATUS
),
818 extract_link (char *file_name
)
820 char const *link_name
;
821 int interdir_made
= 0;
823 if (!prepare_to_extract (file_name
))
828 struct stat st1
, st2
;
830 link_name
= safer_name_suffix (current_stat_info
.link_name
, true);
832 int status
= link (link_name
, file_name
);
837 struct delayed_symlink
*ds
= delayed_symlink_head
;
838 if (ds
&& lstat (link_name
, &st1
) == 0)
839 for (; ds
; ds
= ds
->next
)
840 if (ds
->dev
== st1
.st_dev
841 && ds
->ino
== st1
.st_ino
842 && ds
->mtime
== st1
.st_mtime
)
844 struct string_list
*p
= xmalloc (offsetof (struct string_list
, string
)
845 + strlen (file_name
) + 1);
846 strcpy (p
->string
, file_name
);
847 p
->next
= ds
->sources
;
853 else if ((e
== EEXIST
&& strcmp (link_name
, file_name
) == 0)
854 || (lstat (link_name
, &st1
) == 0
855 && lstat (file_name
, &st2
) == 0
856 && st1
.st_dev
== st2
.st_dev
857 && st1
.st_ino
== st2
.st_ino
))
862 while (maybe_recoverable (file_name
, &interdir_made
));
864 if (!(incremental_option
&& errno
== EEXIST
))
866 link_error (link_name
, file_name
);
873 extract_symlink (char *file_name
)
877 int interdir_made
= 0;
879 if (! prepare_to_extract (file_name
))
882 if (absolute_names_option
883 || ! (IS_ABSOLUTE_FILE_NAME (current_stat_info
.link_name
)
884 || contains_dot_dot (current_stat_info
.link_name
)))
886 while (status
= symlink (current_stat_info
.link_name
, file_name
),
888 if (!maybe_recoverable (file_name
, &interdir_made
))
892 set_stat (file_name
, ¤t_stat_info
.stat
, 0, 0, 0, SYMTYPE
);
894 symlink_error (current_stat_info
.link_name
, file_name
);
898 /* This symbolic link is potentially dangerous. Don't
899 create it now; instead, create a placeholder file, which
900 will be replaced after other extraction is done. */
903 while ((fd
= open (file_name
, O_WRONLY
| O_CREAT
| O_EXCL
, 0)) < 0)
904 if (! maybe_recoverable (file_name
, &interdir_made
))
909 open_error (file_name
);
910 else if (fstat (fd
, &st
) != 0)
912 stat_error (file_name
);
915 else if (close (fd
) != 0)
916 close_error (file_name
);
919 struct delayed_set_stat
*h
;
920 struct delayed_symlink
*p
= xmalloc (offsetof (struct delayed_symlink
, target
)
921 + strlen (current_stat_info
.link_name
)
923 p
->next
= delayed_symlink_head
;
924 delayed_symlink_head
= p
;
927 p
->mtime
= st
.st_mtime
;
928 p
->uid
= current_stat_info
.stat
.st_uid
;
929 p
->gid
= current_stat_info
.stat
.st_gid
;
930 p
->sources
= xmalloc (offsetof (struct string_list
, string
)
931 + strlen (file_name
) + 1);
932 p
->sources
->next
= 0;
933 strcpy (p
->sources
->string
, file_name
);
934 strcpy (p
->target
, current_stat_info
.link_name
);
936 h
= delayed_set_stat_head
;
937 if (h
&& ! h
->after_symlinks
938 && strncmp (file_name
, h
->file_name
, h
->file_name_len
) == 0
939 && ISSLASH (file_name
[h
->file_name_len
])
940 && (base_name (file_name
) == file_name
+ h
->file_name_len
+ 1))
944 h
->after_symlinks
= 1;
946 if (stat (h
->file_name
, &st
) != 0)
947 stat_error (h
->file_name
);
950 h
->stat_info
.st_dev
= st
.st_dev
;
951 h
->stat_info
.st_ino
= st
.st_ino
;
954 while ((h
= h
->next
) && ! h
->after_symlinks
);
961 if (status
!= 0 && backup_option
)
965 static int warned_once
;
970 WARN ((0, 0, _("Attempting extraction of symbolic links as hard links")));
972 extract_link (file_name
);
976 #if S_IFCHR || S_IFBLK
978 extract_node (char *file_name
, int typeflag
)
981 int interdir_made
= 0;
985 if (! prepare_to_extract (file_name
))
988 status
= mknod (file_name
, current_stat_info
.stat
.st_mode
,
989 current_stat_info
.stat
.st_rdev
);
991 while (status
&& maybe_recoverable (file_name
, &interdir_made
));
995 mknod_error (file_name
);
1000 set_stat (file_name
, ¤t_stat_info
.stat
, 0, 0, ARCHIVED_PERMSTATUS
, typeflag
);
1004 #if HAVE_MKFIFO || defined mkfifo
1006 extract_fifo (char *file_name
, int typeflag
)
1009 int interdir_made
= 0;
1011 if (! prepare_to_extract (file_name
))
1014 while ((status
= mkfifo (file_name
, current_stat_info
.stat
.st_mode
)))
1015 if (!maybe_recoverable (file_name
, &interdir_made
))
1019 set_stat (file_name
, ¤t_stat_info
.stat
, NULL
, 0,
1020 ARCHIVED_PERMSTATUS
, typeflag
);
1023 mkfifo_error (file_name
);
1025 undo_last_backup ();
1030 /* Extract a file from the archive. */
1032 extract_archive (void)
1037 set_next_block_after (current_header
);
1038 decode_header (current_header
, ¤t_stat_info
, ¤t_format
, 1);
1040 if (interactive_option
&& !confirm ("extract", current_stat_info
.file_name
))
1046 /* Print the block from current_header and current_stat. */
1049 print_header (¤t_stat_info
, -1);
1051 file_name
= safer_name_suffix (current_stat_info
.file_name
, false);
1052 if (strip_name_components
)
1054 size_t prefix_len
= stripped_prefix_len (file_name
, strip_name_components
);
1055 if (prefix_len
== (size_t) -1)
1060 file_name
+= prefix_len
;
1063 apply_nonancestor_delayed_set_stat (file_name
, 0);
1065 /* Take a safety backup of a previously existing file. */
1067 if (backup_option
&& !to_stdout_option
)
1068 if (!maybe_backup_file (file_name
, 0))
1071 ERROR ((0, e
, _("%s: Was unable to backup this file"),
1072 quotearg_colon (file_name
)));
1077 /* Extract the archive entry according to its type. */
1080 typeflag
= sparse_member_p (¤t_stat_info
) ?
1081 GNUTYPE_SPARSE
: current_header
->header
.typeflag
;
1085 case GNUTYPE_SPARSE
: /* FIXME: Shouldn't we call extract_file at once? */
1090 /* Appears to be a file. But BSD tar uses the convention that a slash
1091 suffix means a directory. */
1093 if (current_stat_info
.had_trailing_slash
)
1094 extract_dir (file_name
, typeflag
);
1096 extract_file (file_name
, typeflag
);
1100 extract_symlink (file_name
);
1104 extract_link (file_name
);
1109 current_stat_info
.stat
.st_mode
|= S_IFCHR
;
1110 extract_node (file_name
, typeflag
);
1116 current_stat_info
.stat
.st_mode
|= S_IFBLK
;
1117 extract_node (file_name
, typeflag
);
1121 #if HAVE_MKFIFO || defined mkfifo
1123 extract_fifo (file_name
, typeflag
);
1128 case GNUTYPE_DUMPDIR
:
1129 extract_dir (file_name
, typeflag
);
1132 case GNUTYPE_VOLHDR
:
1134 fprintf (stdlis
, _("Reading %s\n"), quote (current_stat_info
.file_name
));
1141 case GNUTYPE_MULTIVOL
:
1143 _("%s: Cannot extract -- file is continued from another volume"),
1144 quotearg_colon (current_stat_info
.file_name
)));
1147 undo_last_backup ();
1150 case GNUTYPE_LONGNAME
:
1151 case GNUTYPE_LONGLINK
:
1152 ERROR ((0, 0, _("Unexpected long name header")));
1155 undo_last_backup ();
1160 _("%s: Unknown file type '%c', extracted as normal file"),
1161 quotearg_colon (file_name
), typeflag
));
1162 extract_file (file_name
, typeflag
);
1166 /* Extract the symbolic links whose final extraction were delayed. */
1168 apply_delayed_symlinks (void)
1170 struct delayed_symlink
*ds
;
1172 for (ds
= delayed_symlink_head
; ds
; )
1174 struct string_list
*sources
= ds
->sources
;
1175 char const *valid_source
= 0;
1177 for (sources
= ds
->sources
; sources
; sources
= sources
->next
)
1179 char const *source
= sources
->string
;
1182 /* Make sure the placeholder file is still there. If not,
1183 don't create a symlink, as the placeholder was probably
1184 removed by a later extraction. */
1185 if (lstat (source
, &st
) == 0
1186 && st
.st_dev
== ds
->dev
1187 && st
.st_ino
== ds
->ino
1188 && st
.st_mtime
== ds
->mtime
)
1190 /* Unlink the placeholder, then create a hard link if possible,
1191 a symbolic link otherwise. */
1192 if (unlink (source
) != 0)
1193 unlink_error (source
);
1194 else if (valid_source
&& link (valid_source
, source
) == 0)
1196 else if (symlink (ds
->target
, source
) != 0)
1197 symlink_error (ds
->target
, source
);
1200 valid_source
= source
;
1201 st
.st_uid
= ds
->uid
;
1202 st
.st_gid
= ds
->gid
;
1203 set_stat (source
, &st
, 0, 0, 0, SYMTYPE
);
1208 for (sources
= ds
->sources
; sources
; )
1210 struct string_list
*next
= sources
->next
;
1216 struct delayed_symlink
*next
= ds
->next
;
1222 delayed_symlink_head
= 0;
1225 /* Finish the extraction of an archive. */
1227 extract_finish (void)
1229 /* First, fix the status of ordinary directories that need fixing. */
1230 apply_nonancestor_delayed_set_stat ("", 0);
1232 /* Then, apply delayed symlinks, so that they don't affect delayed
1233 directory status-setting for ordinary directories. */
1234 apply_delayed_symlinks ();
1236 /* Finally, fix the status of directories that are ancestors
1237 of delayed symlinks. */
1238 apply_nonancestor_delayed_set_stat ("", 1);
1245 error (TAREXIT_FAILURE
, 0, _("Error is not recoverable: exiting now"));
1252 error (0, 0, "%s", _("memory exhausted"));