1 /* Extract files from a tar archive.
3 Copyright (C) 1988, 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000,
4 2001, 2003, 2004, 2005, 2006, 2007, 2010 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 3, 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 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
30 static bool we_are_root
; /* true if our effective uid == 0 */
31 static mode_t newdir_umask
; /* umask when creating new directories */
32 static mode_t current_umask
; /* current umask (which is set to 0 if -p) */
34 #define ALL_MODE_BITS ((mode_t) ~ (mode_t) 0)
36 #if ! HAVE_FCHMOD && ! defined fchmod
37 # define fchmod(fd, mode) (errno = ENOSYS, -1)
39 #if ! HAVE_FCHOWN && ! defined fchown
40 # define fchown(fd, uid, gid) (errno = ENOSYS, -1)
43 /* Return true if an error number ERR means the system call is
44 supported in this case. */
48 return ! (err
== ENOSYS
50 || (EOPNOTSUPP
!= ENOTSUP
&& err
== EOPNOTSUPP
));
53 /* List of directories whose statuses we need to extract after we've
54 finished extracting their subsidiary files. If you consider each
55 contiguous subsequence of elements of the form [D]?[^D]*, where [D]
56 represents an element where AFTER_LINKS is nonzero and [^D]
57 represents an element where AFTER_LINKS is zero, then the head
58 of the subsequence has the longest name, and each non-head element
59 in the prefix is an ancestor (in the directory hierarchy) of the
62 struct delayed_set_stat
64 /* Next directory in list. */
65 struct delayed_set_stat
*next
;
67 /* Metadata for this directory. */
70 mode_t mode
; /* The desired mode is MODE & ~ current_umask. */
73 struct timespec atime
;
74 struct timespec mtime
;
76 /* An estimate of the directory's current mode, along with a mask
77 specifying which bits of this estimate are known to be correct.
78 If CURRENT_MODE_MASK is zero, CURRENT_MODE's value doesn't
81 mode_t current_mode_mask
;
83 /* This directory is an intermediate directory that was created
84 as an ancestor of some other directory; it was not mentioned
85 in the archive, so do not set its uid, gid, atime, or mtime,
86 and don't alter its mode outside of MODE_RWX. */
89 /* Whether symbolic links should be followed when accessing the
93 /* Do not set the status of this directory until after delayed
97 /* Directory that the name is relative to. */
100 /* Length and contents of name. */
101 size_t file_name_len
;
105 static struct delayed_set_stat
*delayed_set_stat_head
;
107 /* List of links whose creation we have delayed. */
110 /* The next delayed link in the list. */
111 struct delayed_link
*next
;
113 /* The device, inode number and ctime of the placeholder. Use
114 ctime, not mtime, to make false matches less likely if some
115 other process removes the placeholder. */
118 struct timespec ctime
;
120 /* True if the link is symbolic. */
123 /* The desired metadata, valid only the link is symbolic. */
127 struct timespec atime
;
128 struct timespec mtime
;
130 /* The directory that the sources and target are relative to. */
133 /* A list of sources for this link. The sources are all to be
134 hard-linked together. */
135 struct string_list
*sources
;
137 /* The desired target of the desired link. */
141 static struct delayed_link
*delayed_link_head
;
145 struct string_list
*next
;
149 /* Set up to extract files. */
153 we_are_root
= geteuid () == 0;
154 same_permissions_option
+= we_are_root
;
155 same_owner_option
+= we_are_root
;
157 /* Option -p clears the kernel umask, so it does not affect proper
158 restoration of file permissions. New intermediate directories will
159 comply with umask at start of program. */
161 newdir_umask
= umask (0);
162 if (0 < same_permissions_option
)
166 umask (newdir_umask
); /* restore the kernel umask */
167 current_umask
= newdir_umask
;
171 /* Use fchmod if possible, fchmodat otherwise. */
173 fd_chmod (int fd
, char const *file
, mode_t mode
, int atflag
)
177 int result
= fchmod (fd
, mode
);
178 if (result
== 0 || implemented (errno
))
181 return fchmodat (AT_FDCWD
, file
, mode
, atflag
);
184 /* Use fchown if possible, fchownat otherwise. */
186 fd_chown (int fd
, char const *file
, uid_t uid
, gid_t gid
, int atflag
)
190 int result
= fchown (fd
, uid
, gid
);
191 if (result
== 0 || implemented (errno
))
194 return fchownat (AT_FDCWD
, file
, uid
, gid
, atflag
);
197 /* Use fstat if possible, fstatat otherwise. */
199 fd_stat (int fd
, char const *file
, struct stat
*st
, int atflag
)
203 : fstatat (AT_FDCWD
, file
, st
, atflag
));
206 /* Set the mode for FILE_NAME to MODE.
207 MODE_MASK specifies the bits of MODE that we care about;
208 thus if MODE_MASK is zero, do nothing.
209 If FD is nonnegative, it is a file descriptor for the file.
210 CURRENT_MODE and CURRENT_MODE_MASK specify information known about
211 the file's current mode, using the style of struct delayed_set_stat.
212 TYPEFLAG specifies the type of the file.
213 ATFLAG specifies the flag to use when statting the file. */
215 set_mode (char const *file_name
,
216 mode_t mode
, mode_t mode_mask
, int fd
,
217 mode_t current_mode
, mode_t current_mode_mask
,
218 char typeflag
, int atflag
)
220 if (((current_mode
^ mode
) | ~ current_mode_mask
) & mode_mask
)
222 if (MODE_ALL
& ~ mode_mask
& ~ current_mode_mask
)
225 if (fd_stat (fd
, file_name
, &st
, atflag
) != 0)
227 stat_error (file_name
);
230 current_mode
= st
.st_mode
;
233 current_mode
&= MODE_ALL
;
234 mode
= (current_mode
& ~ mode_mask
) | (mode
& mode_mask
);
236 if (current_mode
!= mode
)
239 fd_chmod (fd
, file_name
, mode
, atflag
) == 0 ? 0 : errno
;
241 /* On Solaris, chmod may fail if we don't have PRIV_ALL, because
242 setuid-root files would otherwise be a backdoor. See
243 http://opensolaris.org/jive/thread.jspa?threadID=95826
245 if (chmod_errno
== EPERM
&& (mode
& S_ISUID
)
246 && priv_set_restore_linkdir () == 0)
249 fd_chmod (fd
, file_name
, mode
, atflag
) == 0 ? 0 : errno
;
250 priv_set_remove_linkdir ();
253 /* Linux fchmodat does not support AT_SYMLINK_NOFOLLOW, and
254 returns ENOTSUP even when operating on non-symlinks, try
255 again with the flag disabled if it does not appear to be
256 supported and if the file is not a symlink. This
257 introduces a race, alas. */
258 if (atflag
&& typeflag
!= SYMTYPE
&& ! implemented (chmod_errno
))
259 chmod_errno
= fd_chmod (fd
, file_name
, mode
, 0) == 0 ? 0 : errno
;
262 && (typeflag
!= SYMTYPE
|| implemented (chmod_errno
)))
265 chmod_error_details (file_name
, mode
);
271 /* Check time after successfully setting FILE_NAME's time stamp to T. */
273 check_time (char const *file_name
, struct timespec t
)
276 WARNOPT (WARN_TIMESTAMP
,
277 (0, 0, _("%s: implausibly old time stamp %s"),
278 file_name
, tartime (t
, true)));
279 else if (timespec_cmp (volume_start_time
, t
) < 0)
283 if (timespec_cmp (now
, t
) < 0)
285 char buf
[TIMESPEC_STRSIZE_BOUND
];
286 struct timespec diff
;
287 diff
.tv_sec
= t
.tv_sec
- now
.tv_sec
;
288 diff
.tv_nsec
= t
.tv_nsec
- now
.tv_nsec
;
289 if (diff
.tv_nsec
< 0)
291 diff
.tv_nsec
+= BILLION
;
294 WARNOPT (WARN_TIMESTAMP
,
295 (0, 0, _("%s: time stamp %s is %s s in the future"),
296 file_name
, tartime (t
, true), code_timespec (diff
, buf
)));
301 /* Restore stat attributes (owner, group, mode and times) for
302 FILE_NAME, using information given in *ST.
303 If FD is nonnegative, it is a file descriptor for the file.
304 CURRENT_MODE and CURRENT_MODE_MASK specify information known about
305 the file's current mode, using the style of struct delayed_set_stat.
306 TYPEFLAG specifies the type of the file.
307 If INTERDIR, this is an intermediate directory.
308 ATFLAG specifies the flag to use when statting the file. */
311 set_stat (char const *file_name
,
312 struct tar_stat_info
const *st
,
313 int fd
, mode_t current_mode
, mode_t current_mode_mask
,
314 char typeflag
, bool interdir
, int atflag
)
316 /* Do the utime before the chmod because some versions of utime are
317 broken and trash the modes of the file. */
319 if (! touch_option
&& ! interdir
)
321 struct timespec ts
[2];
322 if (incremental_option
)
325 ts
[0].tv_nsec
= UTIME_OMIT
;
328 if (fdutimensat (fd
, AT_FDCWD
, file_name
, ts
, atflag
) == 0)
330 if (incremental_option
)
331 check_time (file_name
, ts
[0]);
332 check_time (file_name
, ts
[1]);
334 else if (typeflag
!= SYMTYPE
|| implemented (errno
))
335 utime_error (file_name
);
338 if (0 < same_owner_option
&& ! interdir
)
340 /* Some systems allow non-root users to give files away. Once this
341 done, it is not possible anymore to change file permissions.
342 However, setting file permissions now would be incorrect, since
343 they would apply to the wrong user, and there would be a race
344 condition. So, don't use systems that allow non-root users to
346 uid_t uid
= st
->stat
.st_uid
;
347 gid_t gid
= st
->stat
.st_gid
;
349 if (fd_chown (fd
, file_name
, uid
, gid
, atflag
) == 0)
351 /* Changing the owner can clear st_mode bits in some cases. */
352 if ((current_mode
| ~ current_mode_mask
) & S_IXUGO
)
353 current_mode_mask
&= ~ (current_mode
& (S_ISUID
| S_ISGID
));
355 else if (typeflag
!= SYMTYPE
|| implemented (errno
))
356 chown_error_details (file_name
, uid
, gid
);
360 st
->stat
.st_mode
& ~ current_umask
,
361 0 < same_permissions_option
&& ! interdir
? MODE_ALL
: MODE_RWX
,
362 fd
, current_mode
, current_mode_mask
, typeflag
, atflag
);
365 /* For each entry H in the leading prefix of entries in HEAD that do
366 not have after_links marked, mark H and fill in its dev and ino
367 members. Assume HEAD && ! HEAD->after_links. */
369 mark_after_links (struct delayed_set_stat
*head
)
371 struct delayed_set_stat
*h
= head
;
378 if (stat (h
->file_name
, &st
) != 0)
379 stat_error (h
->file_name
);
386 while ((h
= h
->next
) && ! h
->after_links
);
389 /* Remember to restore stat attributes (owner, group, mode and times)
390 for the directory FILE_NAME, using information given in *ST,
391 once we stop extracting files into that directory.
393 If ST is null, merely create a placeholder node for an intermediate
394 directory that was created by make_directories.
396 NOTICE: this works only if the archive has usual member order, i.e.
397 directory, then the files in that directory. Incremental archive have
398 somewhat reversed order: first go subdirectories, then all other
399 members. To help cope with this case the variable
400 delay_directory_restore_option is set by prepare_to_extract.
402 If an archive was explicitely created so that its member order is
403 reversed, some directory timestamps can be restored incorrectly,
405 tar --no-recursion -cf archive dir dir/file1 foo dir/file2
408 delay_set_stat (char const *file_name
, struct tar_stat_info
const *st
,
409 mode_t current_mode
, mode_t current_mode_mask
,
410 mode_t mode
, int atflag
)
412 size_t file_name_len
= strlen (file_name
);
413 struct delayed_set_stat
*data
=
414 xmalloc (offsetof (struct delayed_set_stat
, file_name
)
415 + file_name_len
+ 1);
416 data
->next
= delayed_set_stat_head
;
420 data
->dev
= st
->stat
.st_dev
;
421 data
->ino
= st
->stat
.st_ino
;
422 data
->uid
= st
->stat
.st_uid
;
423 data
->gid
= st
->stat
.st_gid
;
424 data
->atime
= st
->atime
;
425 data
->mtime
= st
->mtime
;
427 data
->file_name_len
= file_name_len
;
428 data
->current_mode
= current_mode
;
429 data
->current_mode_mask
= current_mode_mask
;
430 data
->interdir
= ! st
;
431 data
->atflag
= atflag
;
432 data
->after_links
= 0;
433 data
->change_dir
= chdir_current
;
434 strcpy (data
->file_name
, file_name
);
435 delayed_set_stat_head
= data
;
436 if (must_be_dot_or_slash (file_name
))
437 mark_after_links (data
);
440 /* Update the delayed_set_stat info for an intermediate directory
441 created within the file name of DIR. The intermediate directory turned
442 out to be the same as this directory, e.g. due to ".." or symbolic
443 links. *DIR_STAT_INFO is the status of the directory. */
445 repair_delayed_set_stat (char const *dir
,
446 struct stat
const *dir_stat_info
)
448 struct delayed_set_stat
*data
;
449 for (data
= delayed_set_stat_head
; data
; data
= data
->next
)
452 if (fstatat (AT_FDCWD
, data
->file_name
, &st
, data
->atflag
) != 0)
454 stat_error (data
->file_name
);
458 if (st
.st_dev
== dir_stat_info
->st_dev
459 && st
.st_ino
== dir_stat_info
->st_ino
)
461 data
->dev
= current_stat_info
.stat
.st_dev
;
462 data
->ino
= current_stat_info
.stat
.st_ino
;
463 data
->mode
= current_stat_info
.stat
.st_mode
;
464 data
->uid
= current_stat_info
.stat
.st_uid
;
465 data
->gid
= current_stat_info
.stat
.st_gid
;
466 data
->atime
= current_stat_info
.atime
;
467 data
->mtime
= current_stat_info
.mtime
;
468 data
->current_mode
= st
.st_mode
;
469 data
->current_mode_mask
= ALL_MODE_BITS
;
470 data
->interdir
= false;
475 ERROR ((0, 0, _("%s: Unexpected inconsistency when making directory"),
476 quotearg_colon (dir
)));
479 /* After a file/link/directory creation has failed, see if
480 it's because some required directory was not present, and if so,
481 create all required directories. Return non-zero if a directory
484 make_directories (char *file_name
)
486 char *cursor0
= file_name
+ FILE_SYSTEM_PREFIX_LEN (file_name
);
487 char *cursor
; /* points into the file name */
488 int did_something
= 0; /* did we do anything yet? */
491 for (cursor
= cursor0
; *cursor
; cursor
++)
496 if (! ISSLASH (*cursor
))
499 /* Avoid mkdir of empty string, if leading or double '/'. */
501 if (cursor
== cursor0
|| ISSLASH (cursor
[-1]))
504 /* Avoid mkdir where last part of file name is "." or "..". */
506 if (cursor
[-1] == '.'
507 && (cursor
== cursor0
+ 1 || ISSLASH (cursor
[-2])
508 || (cursor
[-2] == '.'
509 && (cursor
== cursor0
+ 2 || ISSLASH (cursor
[-3])))))
512 *cursor
= '\0'; /* truncate the name there */
513 desired_mode
= MODE_RWX
& ~ newdir_umask
;
514 mode
= desired_mode
| (we_are_root
? 0 : MODE_WXUSR
);
515 status
= mkdir (file_name
, mode
);
519 /* Create a struct delayed_set_stat even if
520 mode == desired_mode, because
521 repair_delayed_set_stat may need to update the struct. */
522 delay_set_stat (file_name
,
523 0, mode
& ~ current_umask
, MODE_RWX
,
524 desired_mode
, AT_SYMLINK_NOFOLLOW
);
526 print_for_mkdir (file_name
, cursor
- file_name
, desired_mode
);
536 continue; /* Directory already exists. */
537 else if ((errno
== ENOSYS
/* Automounted dirs on Solaris return
538 this. Reported by Warren Hyde
539 <Warren.Hyde@motorola.com> */
540 || ERRNO_IS_EACCES
) /* Turbo C mkdir gives a funny errno. */
541 && access (file_name
, W_OK
) == 0)
544 /* Some other error in the mkdir. We return to the caller. */
548 return did_something
; /* tell them to retry if we made one */
552 file_newer_p (const char *file_name
, struct tar_stat_info
*tar_stat
)
556 if (stat (file_name
, &st
))
560 stat_warn (file_name
);
561 /* Be on the safe side: if the file does exist assume it is newer */
566 if (!S_ISDIR (st
.st_mode
)
567 && tar_timespec_cmp (tar_stat
->mtime
, get_stat_mtime (&st
)) <= 0)
576 #define RECOVER_SKIP 2
578 /* Attempt repairing what went wrong with the extraction. Delete an
579 already existing file or create missing intermediate directories.
580 Return RECOVER_OK if we somewhat increased our chances at a successful
581 extraction, RECOVER_NO if there are no chances, and RECOVER_SKIP if the
582 caller should skip extraction of that member. The value of errno is
583 properly restored on returning RECOVER_NO. */
586 maybe_recoverable (char *file_name
, bool *interdir_made
)
596 /* Remove an old file, if the options allow this. */
598 switch (old_files_option
)
603 case KEEP_NEWER_FILES
:
604 if (file_newer_p (file_name
, ¤t_stat_info
))
611 case DEFAULT_OLD_FILES
:
612 case NO_OVERWRITE_DIR_OLD_FILES
:
613 case OVERWRITE_OLD_FILES
:
615 int r
= remove_any_file (file_name
, ORDINARY_REMOVE_OPTION
);
617 return r
> 0 ? RECOVER_OK
: RECOVER_NO
;
620 case UNLINK_FIRST_OLD_FILES
:
625 /* Attempt creating missing intermediate directories. */
626 if (! make_directories (file_name
))
631 *interdir_made
= true;
635 /* Just say we can't do anything about it... */
641 /* Fix the statuses of all directories whose statuses need fixing, and
642 which are not ancestors of FILE_NAME. If AFTER_LINKS is
643 nonzero, do this for all such directories; otherwise, stop at the
644 first directory that is marked to be fixed up only after delayed
645 links are applied. */
647 apply_nonancestor_delayed_set_stat (char const *file_name
, bool after_links
)
649 size_t file_name_len
= strlen (file_name
);
650 bool check_for_renamed_directories
= 0;
652 while (delayed_set_stat_head
)
654 struct delayed_set_stat
*data
= delayed_set_stat_head
;
655 bool skip_this_one
= 0;
657 mode_t current_mode
= data
->current_mode
;
658 mode_t current_mode_mask
= data
->current_mode_mask
;
660 check_for_renamed_directories
|= data
->after_links
;
662 if (after_links
< data
->after_links
663 || (data
->file_name_len
< file_name_len
664 && file_name
[data
->file_name_len
]
665 && (ISSLASH (file_name
[data
->file_name_len
])
666 || ISSLASH (file_name
[data
->file_name_len
- 1]))
667 && memcmp (file_name
, data
->file_name
, data
->file_name_len
) == 0))
670 chdir_do (data
->change_dir
);
672 if (check_for_renamed_directories
)
674 if (fstatat (AT_FDCWD
, data
->file_name
, &st
, data
->atflag
) != 0)
676 stat_error (data
->file_name
);
681 current_mode
= st
.st_mode
;
682 current_mode_mask
= ALL_MODE_BITS
;
683 if (! (st
.st_dev
== data
->dev
&& st
.st_ino
== data
->ino
))
686 _("%s: Directory renamed before its status could be extracted"),
687 quotearg_colon (data
->file_name
)));
695 struct tar_stat_info sb
;
696 sb
.stat
.st_mode
= data
->mode
;
697 sb
.stat
.st_uid
= data
->uid
;
698 sb
.stat
.st_gid
= data
->gid
;
699 sb
.atime
= data
->atime
;
700 sb
.mtime
= data
->mtime
;
701 set_stat (data
->file_name
, &sb
,
702 -1, current_mode
, current_mode_mask
,
703 DIRTYPE
, data
->interdir
, data
->atflag
);
706 delayed_set_stat_head
= data
->next
;
713 /* Extractor functions for various member types */
716 extract_dir (char *file_name
, int typeflag
)
720 mode_t current_mode
= 0;
721 mode_t current_mode_mask
= 0;
723 bool interdir_made
= false;
725 /* Save 'root device' to avoid purging mount points. */
726 if (one_file_system_option
&& root_device
== 0)
730 if (stat (".", &st
) != 0)
733 root_device
= st
.st_dev
;
736 if (incremental_option
)
737 /* Read the entry and delete files that aren't listed in the archive. */
738 purge_directory (file_name
);
739 else if (typeflag
== GNUTYPE_DUMPDIR
)
742 /* If ownership or permissions will be restored later, create the
743 directory with restrictive permissions at first, so that in the
744 meantime processes owned by other users do not inadvertently
745 create files under this directory that inherit the wrong owner,
746 group, or permissions from the directory. If not root, though,
747 make the directory writeable and searchable at first, so that
748 files can be created under it. */
749 mode
= ((current_stat_info
.stat
.st_mode
750 & (0 < same_owner_option
|| 0 < same_permissions_option
753 | (we_are_root
? 0 : MODE_WXUSR
));
757 status
= mkdir (file_name
, mode
);
760 current_mode
= mode
& ~ current_umask
;
761 current_mode_mask
= MODE_RWX
;
762 atflag
= AT_SYMLINK_NOFOLLOW
;
768 || old_files_option
== DEFAULT_OLD_FILES
769 || old_files_option
== OVERWRITE_OLD_FILES
))
772 if (stat (file_name
, &st
) == 0)
774 current_mode
= st
.st_mode
;
775 current_mode_mask
= ALL_MODE_BITS
;
777 if (S_ISDIR (current_mode
))
781 repair_delayed_set_stat (file_name
, &st
);
790 switch (maybe_recoverable (file_name
, &interdir_made
))
801 mkdir_error (file_name
);
810 || old_files_option
== DEFAULT_OLD_FILES
811 || old_files_option
== OVERWRITE_OLD_FILES
)
812 delay_set_stat (file_name
, ¤t_stat_info
,
813 current_mode
, current_mode_mask
,
814 current_stat_info
.stat
.st_mode
, atflag
);
821 open_output_file (char const *file_name
, int typeflag
, mode_t mode
,
822 mode_t
*current_mode
, mode_t
*current_mode_mask
)
825 bool overwriting_old_files
= old_files_option
== OVERWRITE_OLD_FILES
;
826 int openflag
= (O_WRONLY
| O_BINARY
| O_CREAT
827 | (overwriting_old_files
? O_TRUNC
: O_EXCL
));
830 /* Contiguous files (on the Masscomp) have to specify the size in
831 the open call that creates them. */
833 if (typeflag
== CONTTYPE
)
834 fd
= open (file_name
, openflag
| O_CTG
, mode
, current_stat_info
.stat
.st_size
);
836 fd
= open (file_name
, openflag
, mode
);
838 #else /* not O_CTG */
839 if (typeflag
== CONTTYPE
)
841 static int conttype_diagnosed
;
843 if (!conttype_diagnosed
)
845 conttype_diagnosed
= 1;
846 WARNOPT (WARN_CONTIGUOUS_CAST
,
847 (0, 0, _("Extracting contiguous files as regular files")));
850 fd
= open (file_name
, openflag
, mode
);
852 #endif /* not O_CTG */
856 if (overwriting_old_files
)
859 if (fstat (fd
, &st
) != 0)
866 if (! S_ISREG (st
.st_mode
))
872 *current_mode
= st
.st_mode
;
873 *current_mode_mask
= ALL_MODE_BITS
;
877 *current_mode
= mode
& ~ current_umask
;
878 *current_mode_mask
= MODE_RWX
;
886 extract_file (char *file_name
, int typeflag
)
890 union block
*data_block
;
894 bool interdir_made
= false;
895 mode_t mode
= (current_stat_info
.stat
.st_mode
& MODE_RWX
896 & ~ (0 < same_owner_option
? S_IRWXG
| S_IRWXO
: 0));
897 mode_t current_mode
= 0;
898 mode_t current_mode_mask
= 0;
900 if (to_stdout_option
)
902 else if (to_command_option
)
904 fd
= sys_exec_command (file_name
, 'f', ¤t_stat_info
);
913 int recover
= RECOVER_NO
;
915 fd
= open_output_file (file_name
, typeflag
, mode
,
916 ¤t_mode
, ¤t_mode_mask
);
918 && (recover
= maybe_recoverable (file_name
, &interdir_made
))
924 if (recover
== RECOVER_SKIP
)
926 open_error (file_name
);
931 mv_begin_read (¤t_stat_info
);
932 if (current_stat_info
.is_sparse
)
933 sparse_extract_file (fd
, ¤t_stat_info
, &size
);
935 for (size
= current_stat_info
.stat
.st_size
; size
> 0; )
939 /* Locate data, determine max length writeable, write it,
940 block that we have used the data, then check if the write
943 data_block
= find_next_block ();
946 ERROR ((0, 0, _("Unexpected EOF in archive")));
947 break; /* FIXME: What happens, then? */
950 written
= available_space_after (data_block
);
955 count
= full_write (fd
, data_block
->buffer
, written
);
958 set_next_block_after ((union block
*)
959 (data_block
->buffer
+ written
- 1));
960 if (count
!= written
)
962 if (!to_command_option
)
963 write_error_details (file_name
, count
, written
);
964 /* FIXME: shouldn't we restore from backup? */
973 /* If writing to stdout, don't try to do anything to the filename;
974 it doesn't exist, or we don't want to touch it anyway. */
976 if (to_stdout_option
)
979 if (! to_command_option
)
980 set_stat (file_name
, ¤t_stat_info
, fd
,
981 current_mode
, current_mode_mask
, typeflag
, false,
982 (old_files_option
== OVERWRITE_OLD_FILES
983 ? 0 : AT_SYMLINK_NOFOLLOW
));
987 close_error (file_name
);
989 if (to_command_option
)
995 /* Create a placeholder file with name FILE_NAME, which will be
996 replaced after other extraction is done by a symbolic link if
997 IS_SYMLINK is true, and by a hard link otherwise. Set
998 *INTERDIR_MADE if an intermediate directory is made in the
1002 create_placeholder_file (char *file_name
, bool is_symlink
, bool *interdir_made
)
1007 while ((fd
= open (file_name
, O_WRONLY
| O_CREAT
| O_EXCL
, 0)) < 0)
1009 switch (maybe_recoverable (file_name
, interdir_made
))
1018 open_error (file_name
);
1023 if (fstat (fd
, &st
) != 0)
1025 stat_error (file_name
);
1028 else if (close (fd
) != 0)
1029 close_error (file_name
);
1032 struct delayed_set_stat
*h
;
1033 struct delayed_link
*p
=
1034 xmalloc (offsetof (struct delayed_link
, target
)
1035 + strlen (current_stat_info
.link_name
)
1037 p
->next
= delayed_link_head
;
1038 delayed_link_head
= p
;
1041 p
->ctime
= get_stat_ctime (&st
);
1042 p
->is_symlink
= is_symlink
;
1045 p
->mode
= current_stat_info
.stat
.st_mode
;
1046 p
->uid
= current_stat_info
.stat
.st_uid
;
1047 p
->gid
= current_stat_info
.stat
.st_gid
;
1048 p
->atime
= current_stat_info
.atime
;
1049 p
->mtime
= current_stat_info
.mtime
;
1051 p
->change_dir
= chdir_current
;
1052 p
->sources
= xmalloc (offsetof (struct string_list
, string
)
1053 + strlen (file_name
) + 1);
1054 p
->sources
->next
= 0;
1055 strcpy (p
->sources
->string
, file_name
);
1056 strcpy (p
->target
, current_stat_info
.link_name
);
1058 h
= delayed_set_stat_head
;
1059 if (h
&& ! h
->after_links
1060 && strncmp (file_name
, h
->file_name
, h
->file_name_len
) == 0
1061 && ISSLASH (file_name
[h
->file_name_len
])
1062 && (last_component (file_name
) == file_name
+ h
->file_name_len
+ 1))
1063 mark_after_links (h
);
1072 extract_link (char *file_name
, int typeflag
)
1074 bool interdir_made
= false;
1075 char const *link_name
;
1078 link_name
= current_stat_info
.link_name
;
1080 if (! absolute_names_option
&& contains_dot_dot (link_name
))
1081 return create_placeholder_file (file_name
, false, &interdir_made
);
1085 struct stat st1
, st2
;
1087 int status
= link (link_name
, file_name
);
1092 struct delayed_link
*ds
= delayed_link_head
;
1093 if (ds
&& lstat (link_name
, &st1
) == 0)
1094 for (; ds
; ds
= ds
->next
)
1095 if (ds
->change_dir
== chdir_current
1096 && ds
->dev
== st1
.st_dev
1097 && ds
->ino
== st1
.st_ino
1098 && timespec_cmp (ds
->ctime
, get_stat_ctime (&st1
)) == 0)
1100 struct string_list
*p
= xmalloc (offsetof (struct string_list
, string
)
1101 + strlen (file_name
) + 1);
1102 strcpy (p
->string
, file_name
);
1103 p
->next
= ds
->sources
;
1109 else if ((e
== EEXIST
&& strcmp (link_name
, file_name
) == 0)
1110 || (lstat (link_name
, &st1
) == 0
1111 && lstat (file_name
, &st2
) == 0
1112 && st1
.st_dev
== st2
.st_dev
1113 && st1
.st_ino
== st2
.st_ino
))
1118 while ((rc
= maybe_recoverable (file_name
, &interdir_made
)) == RECOVER_OK
);
1120 if (rc
== RECOVER_SKIP
)
1122 if (!(incremental_option
&& errno
== EEXIST
))
1124 link_error (link_name
, file_name
);
1131 extract_symlink (char *file_name
, int typeflag
)
1134 bool interdir_made
= false;
1136 if (! absolute_names_option
1137 && (IS_ABSOLUTE_FILE_NAME (current_stat_info
.link_name
)
1138 || contains_dot_dot (current_stat_info
.link_name
)))
1139 return create_placeholder_file (file_name
, true, &interdir_made
);
1141 while (symlink (current_stat_info
.link_name
, file_name
))
1142 switch (maybe_recoverable (file_name
, &interdir_made
))
1151 symlink_error (current_stat_info
.link_name
, file_name
);
1155 set_stat (file_name
, ¤t_stat_info
, -1, 0, 0,
1156 SYMTYPE
, false, AT_SYMLINK_NOFOLLOW
);
1160 static int warned_once
;
1165 WARNOPT (WARN_SYMBOLIC_CAST
,
1167 _("Attempting extraction of symbolic links as hard links")));
1169 return extract_link (file_name
, typeflag
);
1173 #if S_IFCHR || S_IFBLK
1175 extract_node (char *file_name
, int typeflag
)
1177 bool interdir_made
= false;
1178 mode_t mode
= (current_stat_info
.stat
.st_mode
& MODE_RWX
1179 & ~ (0 < same_owner_option
? S_IRWXG
| S_IRWXO
: 0));
1181 while (mknod (file_name
, mode
, current_stat_info
.stat
.st_rdev
) != 0)
1182 switch (maybe_recoverable (file_name
, &interdir_made
))
1191 mknod_error (file_name
);
1195 set_stat (file_name
, ¤t_stat_info
, -1,
1196 mode
& ~ current_umask
, MODE_RWX
,
1197 typeflag
, false, AT_SYMLINK_NOFOLLOW
);
1202 #if HAVE_MKFIFO || defined mkfifo
1204 extract_fifo (char *file_name
, int typeflag
)
1206 bool interdir_made
= false;
1207 mode_t mode
= (current_stat_info
.stat
.st_mode
& MODE_RWX
1208 & ~ (0 < same_owner_option
? S_IRWXG
| S_IRWXO
: 0));
1210 while (mkfifo (file_name
, mode
) != 0)
1211 switch (maybe_recoverable (file_name
, &interdir_made
))
1220 mkfifo_error (file_name
);
1224 set_stat (file_name
, ¤t_stat_info
, -1,
1225 mode
& ~ current_umask
, MODE_RWX
,
1226 typeflag
, false, AT_SYMLINK_NOFOLLOW
);
1232 extract_volhdr (char *file_name
, int typeflag
)
1239 extract_failure (char *file_name
, int typeflag
)
1244 typedef int (*tar_extractor_t
) (char *file_name
, int typeflag
);
1248 /* Prepare to extract a file. Find extractor function.
1249 Return zero if extraction should not proceed. */
1252 prepare_to_extract (char const *file_name
, int typeflag
, tar_extractor_t
*fun
)
1256 if (EXTRACT_OVER_PIPE
)
1259 /* Select the extractor */
1262 case GNUTYPE_SPARSE
:
1263 *fun
= extract_file
;
1270 /* Appears to be a file. But BSD tar uses the convention that a slash
1271 suffix means a directory. */
1272 if (current_stat_info
.had_trailing_slash
)
1276 *fun
= extract_file
;
1282 *fun
= extract_symlink
;
1286 *fun
= extract_link
;
1291 current_stat_info
.stat
.st_mode
|= S_IFCHR
;
1292 *fun
= extract_node
;
1298 current_stat_info
.stat
.st_mode
|= S_IFBLK
;
1299 *fun
= extract_node
;
1303 #if HAVE_MKFIFO || defined mkfifo
1305 *fun
= extract_fifo
;
1310 case GNUTYPE_DUMPDIR
:
1312 if (current_stat_info
.is_dumpdir
)
1313 delay_directory_restore_option
= true;
1316 case GNUTYPE_VOLHDR
:
1317 *fun
= extract_volhdr
;
1320 case GNUTYPE_MULTIVOL
:
1322 _("%s: Cannot extract -- file is continued from another volume"),
1323 quotearg_colon (current_stat_info
.file_name
)));
1324 *fun
= extract_failure
;
1327 case GNUTYPE_LONGNAME
:
1328 case GNUTYPE_LONGLINK
:
1329 ERROR ((0, 0, _("Unexpected long name header")));
1330 *fun
= extract_failure
;
1334 WARNOPT (WARN_UNKNOWN_CAST
,
1336 _("%s: Unknown file type `%c', extracted as normal file"),
1337 quotearg_colon (file_name
), typeflag
));
1338 *fun
= extract_file
;
1341 /* Determine whether the extraction should proceed */
1345 switch (old_files_option
)
1347 case UNLINK_FIRST_OLD_FILES
:
1348 if (!remove_any_file (file_name
,
1349 recursive_unlink_option
? RECURSIVE_REMOVE_OPTION
1350 : ORDINARY_REMOVE_OPTION
)
1351 && errno
&& errno
!= ENOENT
)
1353 unlink_error (file_name
);
1358 case KEEP_NEWER_FILES
:
1359 if (file_newer_p (file_name
, ¤t_stat_info
))
1361 WARNOPT (WARN_IGNORE_NEWER
,
1362 (0, 0, _("Current %s is newer or same age"),
1363 quote (file_name
)));
1375 /* Extract a file from the archive. */
1377 extract_archive (void)
1380 tar_extractor_t fun
;
1382 fatal_exit_hook
= extract_finish
;
1384 set_next_block_after (current_header
);
1386 if (!current_stat_info
.file_name
[0]
1387 || (interactive_option
1388 && !confirm ("extract", current_stat_info
.file_name
)))
1394 /* Print the block from current_header and current_stat. */
1396 print_header (¤t_stat_info
, current_header
, -1);
1398 /* Restore stats for all non-ancestor directories, unless
1399 it is an incremental archive.
1400 (see NOTICE in the comment to delay_set_stat above) */
1401 if (!delay_directory_restore_option
)
1403 int dir
= chdir_current
;
1404 apply_nonancestor_delayed_set_stat (current_stat_info
.file_name
, 0);
1408 /* Take a safety backup of a previously existing file. */
1411 if (!maybe_backup_file (current_stat_info
.file_name
, 0))
1414 ERROR ((0, e
, _("%s: Was unable to backup this file"),
1415 quotearg_colon (current_stat_info
.file_name
)));
1420 /* Extract the archive entry according to its type. */
1422 typeflag
= sparse_member_p (¤t_stat_info
) ?
1423 GNUTYPE_SPARSE
: current_header
->header
.typeflag
;
1425 if (prepare_to_extract (current_stat_info
.file_name
, typeflag
, &fun
))
1427 if (fun
&& (*fun
) (current_stat_info
.file_name
, typeflag
)
1429 undo_last_backup ();
1436 /* Extract the links whose final extraction were delayed. */
1438 apply_delayed_links (void)
1440 struct delayed_link
*ds
;
1442 for (ds
= delayed_link_head
; ds
; )
1444 struct string_list
*sources
= ds
->sources
;
1445 char const *valid_source
= 0;
1447 chdir_do (ds
->change_dir
);
1449 for (sources
= ds
->sources
; sources
; sources
= sources
->next
)
1451 char const *source
= sources
->string
;
1454 /* Make sure the placeholder file is still there. If not,
1455 don't create a link, as the placeholder was probably
1456 removed by a later extraction. */
1457 if (lstat (source
, &st
) == 0
1458 && st
.st_dev
== ds
->dev
1459 && st
.st_ino
== ds
->ino
1460 && timespec_cmp (get_stat_ctime (&st
), ds
->ctime
) == 0)
1462 /* Unlink the placeholder, then create a hard link if possible,
1463 a symbolic link otherwise. */
1464 if (unlink (source
) != 0)
1465 unlink_error (source
);
1466 else if (valid_source
&& link (valid_source
, source
) == 0)
1468 else if (!ds
->is_symlink
)
1470 if (link (ds
->target
, source
) != 0)
1471 link_error (ds
->target
, source
);
1473 else if (symlink (ds
->target
, source
) != 0)
1474 symlink_error (ds
->target
, source
);
1477 struct tar_stat_info st1
;
1478 st1
.stat
.st_mode
= ds
->mode
;
1479 st1
.stat
.st_uid
= ds
->uid
;
1480 st1
.stat
.st_gid
= ds
->gid
;
1481 st1
.atime
= ds
->atime
;
1482 st1
.mtime
= ds
->mtime
;
1483 set_stat (source
, &st1
, -1, 0, 0, SYMTYPE
,
1484 false, AT_SYMLINK_NOFOLLOW
);
1485 valid_source
= source
;
1490 for (sources
= ds
->sources
; sources
; )
1492 struct string_list
*next
= sources
->next
;
1498 struct delayed_link
*next
= ds
->next
;
1504 delayed_link_head
= 0;
1507 /* Finish the extraction of an archive. */
1509 extract_finish (void)
1511 /* First, fix the status of ordinary directories that need fixing. */
1512 apply_nonancestor_delayed_set_stat ("", 0);
1514 /* Then, apply delayed links, so that they don't affect delayed
1515 directory status-setting for ordinary directories. */
1516 apply_delayed_links ();
1518 /* Finally, fix the status of directories that are ancestors
1519 of delayed links. */
1520 apply_nonancestor_delayed_set_stat ("", 1);
1524 rename_directory (char *src
, char *dst
)
1526 if (rename (src
, dst
))
1533 if (make_directories (dst
))
1535 if (rename (src
, dst
) == 0)
1542 /* FIXME: Fall back to recursive copying */
1548 ERROR ((0, e
, _("Cannot rename %s to %s"),