1 /* Diff files from a tar archive.
3 Copyright (C) 1988, 1992, 1993, 1994, 1996, 1997, 1999, 2000, 2001,
4 2003, 2004, 2005, 2006, 2007, 2009, 2010 Free Software Foundation, Inc.
6 Written by John Gilmore, on 1987-04-30.
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. */
23 #include <system-ioctl.h>
26 # include <linux/fd.h>
34 /* Nonzero if we are verifying at the moment. */
37 /* File descriptor for the file we are diffing. */
38 static int diff_handle
;
40 /* Area for reading file contents into. */
41 static char *diff_buffer
;
43 /* Initialize for a diff operation. */
48 diff_buffer
= page_aligned_alloc (&ptr
, record_size
);
49 if (listed_incremental_option
)
50 read_directory_file ();
53 /* Sigh about something that differs by writing a MESSAGE to stdlis,
54 given MESSAGE is nonzero. Also set the exit status if not already. */
56 report_difference (struct tar_stat_info
*st
, const char *fmt
, ...)
62 fprintf (stdlis
, "%s: ", quotearg_colon (st
->file_name
));
64 vfprintf (stdlis
, fmt
, ap
);
66 fprintf (stdlis
, "\n");
69 set_exit_status (TAREXIT_DIFFERS
);
72 /* Take a buffer returned by read_and_process and do nothing with it. */
74 process_noop (size_t size
__attribute__ ((unused
)),
75 char *data
__attribute__ ((unused
)))
81 process_rawdata (size_t bytes
, char *buffer
)
83 size_t status
= safe_read (diff_handle
, diff_buffer
, bytes
);
87 if (status
== SAFE_READ_ERROR
)
89 read_error (current_stat_info
.file_name
);
90 report_difference (¤t_stat_info
, NULL
);
94 report_difference (¤t_stat_info
,
95 ngettext ("Could only read %lu of %lu byte",
96 "Could only read %lu of %lu bytes",
98 (unsigned long) status
, (unsigned long) bytes
);
103 if (memcmp (buffer
, diff_buffer
, bytes
))
105 report_difference (¤t_stat_info
, _("Contents differ"));
112 /* Some other routine wants SIZE bytes in the archive. For each chunk
113 of the archive, call PROCESSOR with the size of the chunk, and the
114 address of the chunk it can work with. The PROCESSOR should return
115 nonzero for success. Once it returns error, continue skipping
116 without calling PROCESSOR anymore. */
119 read_and_process (struct tar_stat_info
*st
, int (*processor
) (size_t, char *))
121 union block
*data_block
;
123 off_t size
= st
->stat
.st_size
;
128 data_block
= find_next_block ();
131 ERROR ((0, 0, _("Unexpected EOF in archive")));
135 data_size
= available_space_after (data_block
);
136 if (data_size
> size
)
138 if (!(*processor
) (data_size
, data_block
->buffer
))
139 processor
= process_noop
;
140 set_next_block_after ((union block
*)
141 (data_block
->buffer
+ data_size
- 1));
148 /* Call either stat or lstat over STAT_DATA, depending on
149 --dereference (-h), for a file which should exist. Diagnose any
150 problem. Return nonzero for success, zero otherwise. */
152 get_stat_data (char const *file_name
, struct stat
*stat_data
)
154 int status
= deref_stat (dereference_option
, file_name
, stat_data
);
159 stat_warn (file_name
);
161 stat_error (file_name
);
162 report_difference (¤t_stat_info
, NULL
);
173 struct stat stat_data
;
175 if (!get_stat_data (current_stat_info
.file_name
, &stat_data
))
178 if (!S_ISDIR (stat_data
.st_mode
))
179 report_difference (¤t_stat_info
, _("File type differs"));
180 else if ((current_stat_info
.stat
.st_mode
& MODE_ALL
) !=
181 (stat_data
.st_mode
& MODE_ALL
))
182 report_difference (¤t_stat_info
, _("Mode differs"));
188 char const *file_name
= current_stat_info
.file_name
;
189 struct stat stat_data
;
191 if (!get_stat_data (file_name
, &stat_data
))
193 else if (!S_ISREG (stat_data
.st_mode
))
195 report_difference (¤t_stat_info
, _("File type differs"));
200 if ((current_stat_info
.stat
.st_mode
& MODE_ALL
) !=
201 (stat_data
.st_mode
& MODE_ALL
))
202 report_difference (¤t_stat_info
, _("Mode differs"));
204 if (!sys_compare_uid (&stat_data
, ¤t_stat_info
.stat
))
205 report_difference (¤t_stat_info
, _("Uid differs"));
206 if (!sys_compare_gid (&stat_data
, ¤t_stat_info
.stat
))
207 report_difference (¤t_stat_info
, _("Gid differs"));
209 if (tar_timespec_cmp (get_stat_mtime (&stat_data
),
210 current_stat_info
.mtime
))
211 report_difference (¤t_stat_info
, _("Mod time differs"));
212 if (current_header
->header
.typeflag
!= GNUTYPE_SPARSE
213 && stat_data
.st_size
!= current_stat_info
.stat
.st_size
)
215 report_difference (¤t_stat_info
, _("Size differs"));
220 diff_handle
= open (file_name
, open_read_flags
);
224 open_error (file_name
);
226 report_difference (¤t_stat_info
, NULL
);
232 if (current_stat_info
.is_sparse
)
233 sparse_diff_file (diff_handle
, ¤t_stat_info
);
235 read_and_process (¤t_stat_info
, process_rawdata
);
237 if (atime_preserve_option
== replace_atime_preserve
)
239 struct timespec ts
[2];
240 ts
[0] = get_stat_atime (&stat_data
);
241 ts
[1] = get_stat_mtime (&stat_data
);
242 if (set_file_atime (diff_handle
, file_name
, ts
) != 0)
243 utime_error (file_name
);
246 status
= close (diff_handle
);
248 close_error (file_name
);
257 struct stat file_data
;
258 struct stat link_data
;
260 if (get_stat_data (current_stat_info
.file_name
, &file_data
)
261 && get_stat_data (current_stat_info
.link_name
, &link_data
)
262 && !sys_compare_links (&file_data
, &link_data
))
263 report_difference (¤t_stat_info
,
264 _("Not linked to %s"),
265 quote (current_stat_info
.link_name
));
272 size_t len
= strlen (current_stat_info
.link_name
);
273 char *linkbuf
= alloca (len
+ 1);
275 int status
= readlink (current_stat_info
.file_name
, linkbuf
, len
+ 1);
280 readlink_warn (current_stat_info
.file_name
);
282 readlink_error (current_stat_info
.file_name
);
283 report_difference (¤t_stat_info
, NULL
);
285 else if (status
!= len
286 || strncmp (current_stat_info
.link_name
, linkbuf
, len
) != 0)
287 report_difference (¤t_stat_info
, _("Symlink differs"));
294 struct stat stat_data
;
296 /* FIXME: deal with umask. */
298 if (!get_stat_data (current_stat_info
.file_name
, &stat_data
))
301 if (current_header
->header
.typeflag
== CHRTYPE
302 ? !S_ISCHR (stat_data
.st_mode
)
303 : current_header
->header
.typeflag
== BLKTYPE
304 ? !S_ISBLK (stat_data
.st_mode
)
305 : /* current_header->header.typeflag == FIFOTYPE */
306 !S_ISFIFO (stat_data
.st_mode
))
308 report_difference (¤t_stat_info
, _("File type differs"));
312 if ((current_header
->header
.typeflag
== CHRTYPE
313 || current_header
->header
.typeflag
== BLKTYPE
)
314 && current_stat_info
.stat
.st_rdev
!= stat_data
.st_rdev
)
316 report_difference (¤t_stat_info
, _("Device number differs"));
320 if ((current_stat_info
.stat
.st_mode
& MODE_ALL
) !=
321 (stat_data
.st_mode
& MODE_ALL
))
322 report_difference (¤t_stat_info
, _("Mode differs"));
326 dumpdir_cmp (const char *a
, const char *b
)
335 if (!strchr ("YN", *b
))
337 if (strcmp(a
+ 1, b
+ 1))
339 len
= strlen (a
) + 1;
347 len
= strlen (a
) + 1;
363 const char *dumpdir_buffer
;
365 struct stat stat_data
;
367 if (deref_stat (true, current_stat_info
.file_name
, &stat_data
))
370 stat_warn (current_stat_info
.file_name
);
372 stat_error (current_stat_info
.file_name
);
375 dev
= stat_data
.st_dev
;
377 dumpdir_buffer
= directory_contents (scan_directory (¤t_stat_info
));
381 if (dumpdir_cmp (current_stat_info
.dumpdir
, dumpdir_buffer
))
382 report_difference (¤t_stat_info
, _("Contents differ"));
385 read_and_process (¤t_stat_info
, process_noop
);
391 struct stat stat_data
;
395 if (current_stat_info
.had_trailing_slash
)
401 if (!get_stat_data (current_stat_info
.file_name
, &stat_data
))
404 if (!S_ISREG (stat_data
.st_mode
))
406 report_difference (¤t_stat_info
, _("File type differs"));
411 offset
= OFF_FROM_HEADER (current_header
->oldgnu_header
.offset
);
412 if (stat_data
.st_size
!= current_stat_info
.stat
.st_size
+ offset
)
414 report_difference (¤t_stat_info
, _("Size differs"));
419 fd
= open (current_stat_info
.file_name
, open_read_flags
);
423 open_error (current_stat_info
.file_name
);
424 report_difference (¤t_stat_info
, NULL
);
429 if (lseek (fd
, offset
, SEEK_SET
) < 0)
431 seek_error_details (current_stat_info
.file_name
, offset
);
432 report_difference (¤t_stat_info
, NULL
);
436 read_and_process (¤t_stat_info
, process_rawdata
);
440 close_error (current_stat_info
.file_name
);
443 /* Diff a file against the archive. */
448 set_next_block_after (current_header
);
450 /* Print the block from current_header and current_stat_info. */
455 fprintf (stdlis
, _("Verify "));
456 print_header (¤t_stat_info
, current_header
, -1);
459 switch (current_header
->header
.typeflag
)
462 ERROR ((0, 0, _("%s: Unknown file type `%c', diffed as normal file"),
463 quotearg_colon (current_stat_info
.file_name
),
464 current_header
->header
.typeflag
));
472 /* Appears to be a file. See if it's really a directory. */
474 if (current_stat_info
.had_trailing_slash
)
496 case GNUTYPE_DUMPDIR
:
498 if (is_dumpdir (¤t_stat_info
))
506 case GNUTYPE_MULTIVOL
:
514 if (removed_prefixes_p ())
517 _("Archive contains file names with leading prefixes removed.")));
519 _("Verification may fail to locate original files.")));
525 /* Verifying an archive is meant to check if the physical media got it
526 correctly, so try to defeat clever in-memory buffering pertaining to
527 this particular media. On Linux, for example, the floppy drive would
528 not even be accessed for the whole verification.
530 The code was using fsync only when the ioctl is unavailable, but
531 Marty Leisner says that the ioctl does not work when not preceded by
532 fsync. So, until we know better, or maybe to please Marty, let's do it
533 the unbelievable way :-). */
539 ioctl (archive
, FDFLUSH
);
544 struct mtop operation
;
547 operation
.mt_op
= MTBSF
;
548 operation
.mt_count
= 1;
549 if (status
= rmtioctl (archive
, MTIOCTOP
, (char *) &operation
), status
< 0)
552 || (status
= rmtioctl (archive
, MTIOCTOP
, (char *) &operation
),
556 if (rmtlseek (archive
, (off_t
) 0, SEEK_SET
) != 0)
558 /* Lseek failed. Try a different method. */
559 seek_warn (archive_name_array
[0]);
568 access_mode
= ACCESS_READ
;
574 enum read_header status
= read_header (¤t_header
,
578 if (status
== HEADER_FAILURE
)
585 set_next_block_after (current_header
);
586 status
= read_header (¤t_header
, ¤t_stat_info
,
589 while (status
== HEADER_FAILURE
);
592 ngettext ("VERIFY FAILURE: %d invalid header detected",
593 "VERIFY FAILURE: %d invalid headers detected",
596 if (status
== HEADER_END_OF_FILE
)
598 if (status
== HEADER_ZERO_BLOCK
)
600 set_next_block_after (current_header
);
601 if (!ignore_zeros_option
)
603 char buf
[UINTMAX_STRSIZE_BOUND
];
605 status
= read_header (¤t_header
, ¤t_stat_info
,
607 if (status
== HEADER_ZERO_BLOCK
)
609 WARNOPT (WARN_ALONE_ZERO_BLOCK
,
610 (0, 0, _("A lone zero block at %s"),
611 STRINGIFY_BIGINT (current_block_ordinal (), buf
)));
616 tar_stat_destroy (¤t_stat_info
);
619 access_mode
= ACCESS_WRITE
;