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
= blocking_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 (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
= openat (chdir_fd
, 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
238 && stat_data
.st_size
!= 0)
240 struct timespec atime
= get_stat_atime (&stat_data
);
241 if (set_file_atime (diff_handle
, chdir_fd
, file_name
, atime
)
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
= readlinkat (chdir_fd
, current_stat_info
.file_name
,
281 readlink_warn (current_stat_info
.file_name
);
283 readlink_error (current_stat_info
.file_name
);
284 report_difference (¤t_stat_info
, NULL
);
286 else if (status
!= len
287 || strncmp (current_stat_info
.link_name
, linkbuf
, len
) != 0)
288 report_difference (¤t_stat_info
, _("Symlink differs"));
295 struct stat stat_data
;
297 /* FIXME: deal with umask. */
299 if (!get_stat_data (current_stat_info
.file_name
, &stat_data
))
302 if (current_header
->header
.typeflag
== CHRTYPE
303 ? !S_ISCHR (stat_data
.st_mode
)
304 : current_header
->header
.typeflag
== BLKTYPE
305 ? !S_ISBLK (stat_data
.st_mode
)
306 : /* current_header->header.typeflag == FIFOTYPE */
307 !S_ISFIFO (stat_data
.st_mode
))
309 report_difference (¤t_stat_info
, _("File type differs"));
313 if ((current_header
->header
.typeflag
== CHRTYPE
314 || current_header
->header
.typeflag
== BLKTYPE
)
315 && current_stat_info
.stat
.st_rdev
!= stat_data
.st_rdev
)
317 report_difference (¤t_stat_info
, _("Device number differs"));
321 if ((current_stat_info
.stat
.st_mode
& MODE_ALL
) !=
322 (stat_data
.st_mode
& MODE_ALL
))
323 report_difference (¤t_stat_info
, _("Mode differs"));
327 dumpdir_cmp (const char *a
, const char *b
)
336 if (!strchr ("YN", *b
))
338 if (strcmp(a
+ 1, b
+ 1))
340 len
= strlen (a
) + 1;
348 len
= strlen (a
) + 1;
362 diff_dumpdir (struct tar_stat_info
*dir
)
364 const char *dumpdir_buffer
;
365 struct stat stat_data
;
367 if (deref_stat (dir
->file_name
, &stat_data
) != 0)
370 stat_warn (dir
->file_name
);
372 stat_error (dir
->file_name
);
377 void (*diag
) (char const *) = NULL
;
378 int fd
= subfile_open (dir
->parent
, dir
->orig_file_name
, open_read_flags
);
381 else if (fstat (fd
, &dir
->stat
))
387 file_removed_diag (dir
->orig_file_name
, false, diag
);
391 dumpdir_buffer
= directory_contents (scan_directory (dir
));
395 if (dumpdir_cmp (dir
->dumpdir
, dumpdir_buffer
))
396 report_difference (dir
, _("Contents differ"));
399 read_and_process (dir
, process_noop
);
405 struct stat stat_data
;
409 if (current_stat_info
.had_trailing_slash
)
415 if (!get_stat_data (current_stat_info
.file_name
, &stat_data
))
418 if (!S_ISREG (stat_data
.st_mode
))
420 report_difference (¤t_stat_info
, _("File type differs"));
425 offset
= OFF_FROM_HEADER (current_header
->oldgnu_header
.offset
);
426 if (stat_data
.st_size
!= current_stat_info
.stat
.st_size
+ offset
)
428 report_difference (¤t_stat_info
, _("Size differs"));
434 fd
= openat (chdir_fd
, current_stat_info
.file_name
, open_read_flags
);
438 open_error (current_stat_info
.file_name
);
439 report_difference (¤t_stat_info
, NULL
);
444 if (lseek (fd
, offset
, SEEK_SET
) < 0)
446 seek_error_details (current_stat_info
.file_name
, offset
);
447 report_difference (¤t_stat_info
, NULL
);
451 read_and_process (¤t_stat_info
, process_rawdata
);
455 close_error (current_stat_info
.file_name
);
458 /* Diff a file against the archive. */
463 set_next_block_after (current_header
);
465 /* Print the block from current_header and current_stat_info. */
470 fprintf (stdlis
, _("Verify "));
471 print_header (¤t_stat_info
, current_header
, -1);
474 switch (current_header
->header
.typeflag
)
477 ERROR ((0, 0, _("%s: Unknown file type '%c', diffed as normal file"),
478 quotearg_colon (current_stat_info
.file_name
),
479 current_header
->header
.typeflag
));
487 /* Appears to be a file. See if it's really a directory. */
489 if (current_stat_info
.had_trailing_slash
)
511 case GNUTYPE_DUMPDIR
:
513 if (is_dumpdir (¤t_stat_info
))
514 diff_dumpdir (¤t_stat_info
);
521 case GNUTYPE_MULTIVOL
:
530 if (removed_prefixes_p ())
533 _("Archive contains file names with leading prefixes removed.")));
536 if (transform_program_p ())
539 _("Archive contains transformed file names.")));
544 _("Verification may fail to locate original files.")));
546 clear_directory_table ();
551 /* Verifying an archive is meant to check if the physical media got it
552 correctly, so try to defeat clever in-memory buffering pertaining to
553 this particular media. On Linux, for example, the floppy drive would
554 not even be accessed for the whole verification.
556 The code was using fsync only when the ioctl is unavailable, but
557 Marty Leisner says that the ioctl does not work when not preceded by
558 fsync. So, until we know better, or maybe to please Marty, let's do it
559 the unbelievable way :-). */
565 ioctl (archive
, FDFLUSH
);
570 struct mtop operation
;
573 operation
.mt_op
= MTBSF
;
574 operation
.mt_count
= 1;
575 if (status
= rmtioctl (archive
, MTIOCTOP
, (char *) &operation
), status
< 0)
578 || (status
= rmtioctl (archive
, MTIOCTOP
, (char *) &operation
),
582 if (rmtlseek (archive
, (off_t
) 0, SEEK_SET
) != 0)
584 /* Lseek failed. Try a different method. */
585 seek_warn (archive_name_array
[0]);
594 access_mode
= ACCESS_READ
;
600 enum read_header status
= read_header (¤t_header
,
604 if (status
== HEADER_FAILURE
)
611 set_next_block_after (current_header
);
612 status
= read_header (¤t_header
, ¤t_stat_info
,
615 while (status
== HEADER_FAILURE
);
618 ngettext ("VERIFY FAILURE: %d invalid header detected",
619 "VERIFY FAILURE: %d invalid headers detected",
622 if (status
== HEADER_END_OF_FILE
)
624 if (status
== HEADER_ZERO_BLOCK
)
626 set_next_block_after (current_header
);
627 if (!ignore_zeros_option
)
629 char buf
[UINTMAX_STRSIZE_BOUND
];
631 status
= read_header (¤t_header
, ¤t_stat_info
,
633 if (status
== HEADER_ZERO_BLOCK
)
635 WARNOPT (WARN_ALONE_ZERO_BLOCK
,
636 (0, 0, _("A lone zero block at %s"),
637 STRINGIFY_BIGINT (current_block_ordinal (), buf
)));
642 decode_header (current_header
, ¤t_stat_info
, ¤t_format
, 1);
644 tar_stat_destroy (¤t_stat_info
);
647 access_mode
= ACCESS_WRITE
;