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"));
221 (atime_preserve_option
== system_atime_preserve
225 diff_handle
= open (file_name
,
226 (O_RDONLY
| O_BINARY
| O_CLOEXEC
| O_NOCTTY
227 | O_NONBLOCK
| atime_flag
));
231 open_error (file_name
);
233 report_difference (¤t_stat_info
, NULL
);
239 if (current_stat_info
.is_sparse
)
240 sparse_diff_file (diff_handle
, ¤t_stat_info
);
242 read_and_process (¤t_stat_info
, process_rawdata
);
244 if (atime_preserve_option
== replace_atime_preserve
)
246 struct timespec atime
= get_stat_atime (&stat_data
);
247 if (set_file_atime (diff_handle
, file_name
, atime
, 0) != 0)
248 utime_error (file_name
);
251 status
= close (diff_handle
);
253 close_error (file_name
);
262 struct stat file_data
;
263 struct stat link_data
;
265 if (get_stat_data (current_stat_info
.file_name
, &file_data
)
266 && get_stat_data (current_stat_info
.link_name
, &link_data
)
267 && !sys_compare_links (&file_data
, &link_data
))
268 report_difference (¤t_stat_info
,
269 _("Not linked to %s"),
270 quote (current_stat_info
.link_name
));
277 size_t len
= strlen (current_stat_info
.link_name
);
278 char *linkbuf
= alloca (len
+ 1);
280 int status
= readlink (current_stat_info
.file_name
, linkbuf
, len
+ 1);
285 readlink_warn (current_stat_info
.file_name
);
287 readlink_error (current_stat_info
.file_name
);
288 report_difference (¤t_stat_info
, NULL
);
290 else if (status
!= len
291 || strncmp (current_stat_info
.link_name
, linkbuf
, len
) != 0)
292 report_difference (¤t_stat_info
, _("Symlink differs"));
299 struct stat stat_data
;
301 /* FIXME: deal with umask. */
303 if (!get_stat_data (current_stat_info
.file_name
, &stat_data
))
306 if (current_header
->header
.typeflag
== CHRTYPE
307 ? !S_ISCHR (stat_data
.st_mode
)
308 : current_header
->header
.typeflag
== BLKTYPE
309 ? !S_ISBLK (stat_data
.st_mode
)
310 : /* current_header->header.typeflag == FIFOTYPE */
311 !S_ISFIFO (stat_data
.st_mode
))
313 report_difference (¤t_stat_info
, _("File type differs"));
317 if ((current_header
->header
.typeflag
== CHRTYPE
318 || current_header
->header
.typeflag
== BLKTYPE
)
319 && current_stat_info
.stat
.st_rdev
!= stat_data
.st_rdev
)
321 report_difference (¤t_stat_info
, _("Device number differs"));
325 if ((current_stat_info
.stat
.st_mode
& MODE_ALL
) !=
326 (stat_data
.st_mode
& MODE_ALL
))
327 report_difference (¤t_stat_info
, _("Mode differs"));
331 dumpdir_cmp (const char *a
, const char *b
)
340 if (!strchr ("YN", *b
))
342 if (strcmp(a
+ 1, b
+ 1))
344 len
= strlen (a
) + 1;
352 len
= strlen (a
) + 1;
368 const char *dumpdir_buffer
;
370 struct stat stat_data
;
372 if (deref_stat (true, current_stat_info
.file_name
, &stat_data
))
375 stat_warn (current_stat_info
.file_name
);
377 stat_error (current_stat_info
.file_name
);
380 dev
= stat_data
.st_dev
;
382 dumpdir_buffer
= directory_contents (scan_directory (¤t_stat_info
));
386 if (dumpdir_cmp (current_stat_info
.dumpdir
, dumpdir_buffer
))
387 report_difference (¤t_stat_info
, _("Contents differ"));
390 read_and_process (¤t_stat_info
, process_noop
);
396 struct stat stat_data
;
400 (atime_preserve_option
== system_atime_preserve
404 if (current_stat_info
.had_trailing_slash
)
410 if (!get_stat_data (current_stat_info
.file_name
, &stat_data
))
413 if (!S_ISREG (stat_data
.st_mode
))
415 report_difference (¤t_stat_info
, _("File type differs"));
420 offset
= OFF_FROM_HEADER (current_header
->oldgnu_header
.offset
);
421 if (stat_data
.st_size
!= current_stat_info
.stat
.st_size
+ offset
)
423 report_difference (¤t_stat_info
, _("Size differs"));
429 fd
= open (current_stat_info
.file_name
,
430 (O_RDONLY
| O_BINARY
| O_CLOEXEC
| O_NOCTTY
| O_NONBLOCK
435 open_error (current_stat_info
.file_name
);
436 report_difference (¤t_stat_info
, NULL
);
441 if (lseek (fd
, offset
, SEEK_SET
) < 0)
443 seek_error_details (current_stat_info
.file_name
, offset
);
444 report_difference (¤t_stat_info
, NULL
);
448 read_and_process (¤t_stat_info
, process_rawdata
);
452 close_error (current_stat_info
.file_name
);
455 /* Diff a file against the archive. */
460 set_next_block_after (current_header
);
462 /* Print the block from current_header and current_stat_info. */
467 fprintf (stdlis
, _("Verify "));
468 print_header (¤t_stat_info
, current_header
, -1);
471 switch (current_header
->header
.typeflag
)
474 ERROR ((0, 0, _("%s: Unknown file type `%c', diffed as normal file"),
475 quotearg_colon (current_stat_info
.file_name
),
476 current_header
->header
.typeflag
));
484 /* Appears to be a file. See if it's really a directory. */
486 if (current_stat_info
.had_trailing_slash
)
508 case GNUTYPE_DUMPDIR
:
510 if (is_dumpdir (¤t_stat_info
))
518 case GNUTYPE_MULTIVOL
:
526 if (removed_prefixes_p ())
529 _("Archive contains file names with leading prefixes removed.")));
531 _("Verification may fail to locate original files.")));
537 /* Verifying an archive is meant to check if the physical media got it
538 correctly, so try to defeat clever in-memory buffering pertaining to
539 this particular media. On Linux, for example, the floppy drive would
540 not even be accessed for the whole verification.
542 The code was using fsync only when the ioctl is unavailable, but
543 Marty Leisner says that the ioctl does not work when not preceded by
544 fsync. So, until we know better, or maybe to please Marty, let's do it
545 the unbelievable way :-). */
551 ioctl (archive
, FDFLUSH
);
556 struct mtop operation
;
559 operation
.mt_op
= MTBSF
;
560 operation
.mt_count
= 1;
561 if (status
= rmtioctl (archive
, MTIOCTOP
, (char *) &operation
), status
< 0)
564 || (status
= rmtioctl (archive
, MTIOCTOP
, (char *) &operation
),
568 if (rmtlseek (archive
, (off_t
) 0, SEEK_SET
) != 0)
570 /* Lseek failed. Try a different method. */
571 seek_warn (archive_name_array
[0]);
580 access_mode
= ACCESS_READ
;
586 enum read_header status
= read_header (¤t_header
,
590 if (status
== HEADER_FAILURE
)
597 set_next_block_after (current_header
);
598 status
= read_header (¤t_header
, ¤t_stat_info
,
601 while (status
== HEADER_FAILURE
);
604 ngettext ("VERIFY FAILURE: %d invalid header detected",
605 "VERIFY FAILURE: %d invalid headers detected",
608 if (status
== HEADER_END_OF_FILE
)
610 if (status
== HEADER_ZERO_BLOCK
)
612 set_next_block_after (current_header
);
613 if (!ignore_zeros_option
)
615 char buf
[UINTMAX_STRSIZE_BOUND
];
617 status
= read_header (¤t_header
, ¤t_stat_info
,
619 if (status
== HEADER_ZERO_BLOCK
)
621 WARNOPT (WARN_ALONE_ZERO_BLOCK
,
622 (0, 0, _("A lone zero block at %s"),
623 STRINGIFY_BIGINT (current_block_ordinal (), buf
)));
628 tar_stat_destroy (¤t_stat_info
);
631 access_mode
= ACCESS_WRITE
;