/* Diff files from a tar archive.
Copyright (C) 1988, 1992, 1993, 1994, 1996, 1997, 1999, 2000, 2001,
- 2003, 2004 Free Software Foundation, Inc.
+ 2003, 2004, 2005, 2006, 2007, 2009, 2010 Free Software Foundation, Inc.
Written by John Gilmore, on 1987-04-30.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
- Free Software Foundation; either version 2, or (at your option) any later
+ Free Software Foundation; either version 3, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
- 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
-#include "system.h"
-
-#if HAVE_UTIME_H
-# include <utime.h>
-#else
-struct utimbuf
- {
- long actime;
- long modtime;
- };
-#endif
+#include <system.h>
+#include <system-ioctl.h>
#if HAVE_LINUX_FD_H
# include <linux/fd.h>
#endif
-#include <quotearg.h>
-
#include "common.h"
-#include "rmt.h"
+#include <quotearg.h>
+#include <rmt.h>
#include <stdarg.h>
/* Nonzero if we are verifying at the moment. */
{
void *ptr;
diff_buffer = page_aligned_alloc (&ptr, record_size);
+ if (listed_incremental_option)
+ read_directory_file ();
}
/* Sigh about something that differs by writing a MESSAGE to stdlis,
given MESSAGE is nonzero. Also set the exit status if not already. */
void
-report_difference (struct tar_stat_info *st __attribute__ ((unused)),
- const char *fmt, ...)
+report_difference (struct tar_stat_info *st, const char *fmt, ...)
{
if (fmt)
{
va_list ap;
- fprintf (stdlis, "%s: ", quotearg_colon (current_stat_info.file_name));
+ fprintf (stdlis, "%s: ", quotearg_colon (st->file_name));
va_start (ap, fmt);
vfprintf (stdlis, fmt, ap);
va_end (ap);
fprintf (stdlis, "\n");
}
- if (exit_status == TAREXIT_SUCCESS)
- exit_status = TAREXIT_DIFFERS;
+ set_exit_status (TAREXIT_DIFFERS);
}
/* Take a buffer returned by read_and_process and do nothing with it. */
}
if (memcmp (buffer, diff_buffer, bytes))
- {
- report_difference (¤t_stat_info,
- _("Contents differ"));
- return 0;
- }
-
- return 1;
-}
-
-/* Directory contents, only for GNUTYPE_DUMPDIR. */
-
-static char *dumpdir_cursor;
-
-static int
-process_dumpdir (size_t bytes, char *buffer)
-{
- if (memcmp (buffer, dumpdir_cursor, bytes))
{
report_difference (¤t_stat_info, _("Contents differ"));
return 0;
}
- dumpdir_cursor += bytes;
return 1;
}
/* Some other routine wants SIZE bytes in the archive. For each chunk
of the archive, call PROCESSOR with the size of the chunk, and the
address of the chunk it can work with. The PROCESSOR should return
- nonzero for success. It it return error once, continue skipping
+ nonzero for success. Once it returns error, continue skipping
without calling PROCESSOR anymore. */
+
static void
-read_and_process (off_t size, int (*processor) (size_t, char *))
+read_and_process (struct tar_stat_info *st, int (*processor) (size_t, char *))
{
union block *data_block;
size_t data_size;
+ off_t size = st->stat.st_size;
- if (multi_volume_option)
- save_sizeleft = size;
+ mv_begin_read (st);
while (size)
{
data_block = find_next_block ();
set_next_block_after ((union block *)
(data_block->buffer + data_size - 1));
size -= data_size;
- if (multi_volume_option)
- save_sizeleft -= data_size;
+ mv_size_left (size);
}
+ mv_end ();
}
/* Call either stat or lstat over STAT_DATA, depending on
return 1;
}
-/* Diff a file against the archive. */
-void
-diff_archive (void)
+\f
+static void
+diff_dir (void)
{
struct stat stat_data;
- int status;
- struct utimbuf restore_times;
- set_next_block_after (current_header);
- decode_header (current_header, ¤t_stat_info, ¤t_format, 1);
+ if (!get_stat_data (current_stat_info.file_name, &stat_data))
+ return;
- /* Print the block from current_header and current_stat_info. */
+ if (!S_ISDIR (stat_data.st_mode))
+ report_difference (¤t_stat_info, _("File type differs"));
+ else if ((current_stat_info.stat.st_mode & MODE_ALL) !=
+ (stat_data.st_mode & MODE_ALL))
+ report_difference (¤t_stat_info, _("Mode differs"));
+}
- if (verbose_option)
+static void
+diff_file (void)
+{
+ char const *file_name = current_stat_info.file_name;
+ struct stat stat_data;
+
+ if (!get_stat_data (file_name, &stat_data))
+ skip_member ();
+ else if (!S_ISREG (stat_data.st_mode))
{
- if (now_verifying)
- fprintf (stdlis, _("Verify "));
- print_header (¤t_stat_info, -1);
+ report_difference (¤t_stat_info, _("File type differs"));
+ skip_member ();
}
-
- switch (current_header->header.typeflag)
+ else
{
- default:
- ERROR ((0, 0, _("%s: Unknown file type '%c', diffed as normal file"),
- quotearg_colon (current_stat_info.file_name),
- current_header->header.typeflag));
- /* Fall through. */
-
- case AREGTYPE:
- case REGTYPE:
- case GNUTYPE_SPARSE:
- case CONTTYPE:
-
- /* Appears to be a file. See if it's really a directory. */
-
- if (current_stat_info.had_trailing_slash)
- goto really_dir;
-
- if (!get_stat_data (current_stat_info.file_name, &stat_data))
- {
- skip_member ();
- goto quit;
- }
-
- if (!S_ISREG (stat_data.st_mode))
- {
- report_difference (¤t_stat_info, _("File type differs"));
- skip_member ();
- goto quit;
- }
-
if ((current_stat_info.stat.st_mode & MODE_ALL) !=
(stat_data.st_mode & MODE_ALL))
report_difference (¤t_stat_info, _("Mode differs"));
if (!sys_compare_gid (&stat_data, ¤t_stat_info.stat))
report_difference (¤t_stat_info, _("Gid differs"));
- if (stat_data.st_mtime != current_stat_info.stat.st_mtime)
+ if (tar_timespec_cmp (get_stat_mtime (&stat_data),
+ current_stat_info.mtime))
report_difference (¤t_stat_info, _("Mod time differs"));
- if (current_header->header.typeflag != GNUTYPE_SPARSE &&
- stat_data.st_size != current_stat_info.stat.st_size)
+ if (current_header->header.typeflag != GNUTYPE_SPARSE
+ && stat_data.st_size != current_stat_info.stat.st_size)
{
report_difference (¤t_stat_info, _("Size differs"));
skip_member ();
- goto quit;
}
+ else
+ {
+ int atime_flag =
+ (atime_preserve_option == system_atime_preserve
+ ? O_NOATIME
+ : 0);
- diff_handle = open (current_stat_info.file_name, O_RDONLY | O_BINARY);
+ diff_handle = openat (chdir_fd, file_name,
+ (O_RDONLY | O_BINARY | O_CLOEXEC | O_NOCTTY
+ | O_NONBLOCK | atime_flag));
- if (diff_handle < 0)
- {
- open_error (current_stat_info.file_name);
- skip_member ();
- report_difference (¤t_stat_info, NULL);
- goto quit;
+ if (diff_handle < 0)
+ {
+ open_error (file_name);
+ skip_member ();
+ report_difference (¤t_stat_info, NULL);
+ }
+ else
+ {
+ int status;
+
+ if (current_stat_info.is_sparse)
+ sparse_diff_file (diff_handle, ¤t_stat_info);
+ else
+ read_and_process (¤t_stat_info, process_rawdata);
+
+ if (atime_preserve_option == replace_atime_preserve)
+ {
+ struct timespec atime = get_stat_atime (&stat_data);
+ if (set_file_atime (diff_handle, chdir_fd, file_name,
+ atime, 0)
+ != 0)
+ utime_error (file_name);
+ }
+
+ status = close (diff_handle);
+ if (status != 0)
+ close_error (file_name);
+ }
}
+ }
+}
+
+static void
+diff_link (void)
+{
+ struct stat file_data;
+ struct stat link_data;
+
+ if (get_stat_data (current_stat_info.file_name, &file_data)
+ && get_stat_data (current_stat_info.link_name, &link_data)
+ && !sys_compare_links (&file_data, &link_data))
+ report_difference (¤t_stat_info,
+ _("Not linked to %s"),
+ quote (current_stat_info.link_name));
+}
- restore_times.actime = stat_data.st_atime;
- restore_times.modtime = stat_data.st_mtime;
+#ifdef HAVE_READLINK
+static void
+diff_symlink (void)
+{
+ size_t len = strlen (current_stat_info.link_name);
+ char *linkbuf = alloca (len + 1);
- /* Need to treat sparse files completely differently here. */
+ int status = readlinkat (chdir_fd, current_stat_info.file_name,
+ linkbuf, len + 1);
- if (current_stat_info.is_sparse)
- sparse_diff_file (diff_handle, ¤t_stat_info);
+ if (status < 0)
+ {
+ if (errno == ENOENT)
+ readlink_warn (current_stat_info.file_name);
else
- {
- if (multi_volume_option)
- {
- assign_string (&save_name, current_stat_info.file_name);
- save_totsize = current_stat_info.stat.st_size;
- /* save_sizeleft is set in read_and_process. */
- }
-
- read_and_process (current_stat_info.stat.st_size, process_rawdata);
+ readlink_error (current_stat_info.file_name);
+ report_difference (¤t_stat_info, NULL);
+ }
+ else if (status != len
+ || strncmp (current_stat_info.link_name, linkbuf, len) != 0)
+ report_difference (¤t_stat_info, _("Symlink differs"));
+}
+#endif
- if (multi_volume_option)
- assign_string (&save_name, 0);
- }
+static void
+diff_special (void)
+{
+ struct stat stat_data;
- status = close (diff_handle);
- if (status != 0)
- close_error (current_stat_info.file_name);
+ /* FIXME: deal with umask. */
- if (atime_preserve_option)
- utime (current_stat_info.file_name, &restore_times);
+ if (!get_stat_data (current_stat_info.file_name, &stat_data))
+ return;
- quit:
- break;
+ if (current_header->header.typeflag == CHRTYPE
+ ? !S_ISCHR (stat_data.st_mode)
+ : current_header->header.typeflag == BLKTYPE
+ ? !S_ISBLK (stat_data.st_mode)
+ : /* current_header->header.typeflag == FIFOTYPE */
+ !S_ISFIFO (stat_data.st_mode))
+ {
+ report_difference (¤t_stat_info, _("File type differs"));
+ return;
+ }
- case LNKTYPE:
- {
- struct stat file_data;
- struct stat link_data;
-
- if (!get_stat_data (current_stat_info.file_name, &file_data))
- break;
- if (!get_stat_data (current_stat_info.link_name, &link_data))
- break;
- if (!sys_compare_links (&file_data, &link_data))
- report_difference (¤t_stat_info,
- _("Not linked to %s"),
- quote (current_stat_info.link_name));
- }
- break;
+ if ((current_header->header.typeflag == CHRTYPE
+ || current_header->header.typeflag == BLKTYPE)
+ && current_stat_info.stat.st_rdev != stat_data.st_rdev)
+ {
+ report_difference (¤t_stat_info, _("Device number differs"));
+ return;
+ }
-#ifdef HAVE_READLINK
- case SYMTYPE:
- {
- size_t len = strlen (current_stat_info.link_name);
- char *linkbuf = alloca (len + 1);
+ if ((current_stat_info.stat.st_mode & MODE_ALL) !=
+ (stat_data.st_mode & MODE_ALL))
+ report_difference (¤t_stat_info, _("Mode differs"));
+}
- status = readlink (current_stat_info.file_name, linkbuf, len + 1);
+static int
+dumpdir_cmp (const char *a, const char *b)
+{
+ size_t len;
- if (status < 0)
- {
- if (errno == ENOENT)
- readlink_warn (current_stat_info.file_name);
- else
- readlink_error (current_stat_info.file_name);
- report_difference (¤t_stat_info, NULL);
- }
- else if (status != len
- || strncmp (current_stat_info.link_name, linkbuf, len) != 0)
- report_difference (¤t_stat_info, _("Symlink differs"));
+ while (*a)
+ switch (*a)
+ {
+ case 'Y':
+ case 'N':
+ if (!strchr ("YN", *b))
+ return 1;
+ if (strcmp(a + 1, b + 1))
+ return 1;
+ len = strlen (a) + 1;
+ a += len;
+ b += len;
+ break;
+ case 'D':
+ if (strcmp(a, b))
+ return 1;
+ len = strlen (a) + 1;
+ a += len;
+ b += len;
break;
- }
-#endif
- case CHRTYPE:
- case BLKTYPE:
- case FIFOTYPE:
+ case 'R':
+ case 'T':
+ case 'X':
+ return *b;
+ }
+ return *b;
+}
- /* FIXME: deal with umask. */
+static void
+diff_dumpdir (void)
+{
+ const char *dumpdir_buffer;
+ dev_t dev = 0;
+ struct stat stat_data;
- if (!get_stat_data (current_stat_info.file_name, &stat_data))
- break;
+ if (deref_stat (true, current_stat_info.file_name, &stat_data))
+ {
+ if (errno == ENOENT)
+ stat_warn (current_stat_info.file_name);
+ else
+ stat_error (current_stat_info.file_name);
+ }
+ else
+ dev = stat_data.st_dev;
- if (current_header->header.typeflag == CHRTYPE
- ? !S_ISCHR (stat_data.st_mode)
- : current_header->header.typeflag == BLKTYPE
- ? !S_ISBLK (stat_data.st_mode)
- : /* current_header->header.typeflag == FIFOTYPE */
- !S_ISFIFO (stat_data.st_mode))
- {
- report_difference (¤t_stat_info, _("File type differs"));
- break;
- }
+ dumpdir_buffer = directory_contents (scan_directory (¤t_stat_info));
- if ((current_header->header.typeflag == CHRTYPE
- || current_header->header.typeflag == BLKTYPE)
- && current_stat_info.stat.st_rdev != stat_data.st_rdev)
- {
- report_difference (¤t_stat_info, _("Device number differs"));
- break;
- }
+ if (dumpdir_buffer)
+ {
+ if (dumpdir_cmp (current_stat_info.dumpdir, dumpdir_buffer))
+ report_difference (¤t_stat_info, _("Contents differ"));
+ }
+ else
+ read_and_process (¤t_stat_info, process_noop);
+}
- if ((current_stat_info.stat.st_mode & MODE_ALL) != (stat_data.st_mode & MODE_ALL))
- {
- report_difference (¤t_stat_info, _("Mode differs"));
- break;
- }
+static void
+diff_multivol (void)
+{
+ struct stat stat_data;
+ int fd, status;
+ off_t offset;
+ int atime_flag =
+ (atime_preserve_option == system_atime_preserve
+ ? O_NOATIME
+ : 0);
+
+ if (current_stat_info.had_trailing_slash)
+ {
+ diff_dir ();
+ return;
+ }
- break;
+ if (!get_stat_data (current_stat_info.file_name, &stat_data))
+ return;
- case GNUTYPE_DUMPDIR:
- {
- char *dumpdir_buffer = get_directory_contents (current_stat_info.file_name, 0);
+ if (!S_ISREG (stat_data.st_mode))
+ {
+ report_difference (¤t_stat_info, _("File type differs"));
+ skip_member ();
+ return;
+ }
- if (multi_volume_option)
- {
- assign_string (&save_name, current_stat_info.file_name);
- save_totsize = current_stat_info.stat.st_size;
- /* save_sizeleft is set in read_and_process. */
- }
+ offset = OFF_FROM_HEADER (current_header->oldgnu_header.offset);
+ if (stat_data.st_size != current_stat_info.stat.st_size + offset)
+ {
+ report_difference (¤t_stat_info, _("Size differs"));
+ skip_member ();
+ return;
+ }
- if (dumpdir_buffer)
- {
- dumpdir_cursor = dumpdir_buffer;
- read_and_process (current_stat_info.stat.st_size, process_dumpdir);
- free (dumpdir_buffer);
- }
- else
- read_and_process (current_stat_info.stat.st_size, process_noop);
- if (multi_volume_option)
- assign_string (&save_name, 0);
- /* Fall through. */
- }
+ fd = openat (chdir_fd, current_stat_info.file_name,
+ (O_RDONLY | O_BINARY | O_CLOEXEC | O_NOCTTY | O_NONBLOCK
+ | atime_flag));
- case DIRTYPE:
- really_dir:
- if (!get_stat_data (current_stat_info.file_name, &stat_data))
- break;
+ if (fd < 0)
+ {
+ open_error (current_stat_info.file_name);
+ report_difference (¤t_stat_info, NULL);
+ skip_member ();
+ return;
+ }
- if (!S_ISDIR (stat_data.st_mode))
- {
- report_difference (¤t_stat_info, _("File type differs"));
- break;
- }
+ if (lseek (fd, offset, SEEK_SET) < 0)
+ {
+ seek_error_details (current_stat_info.file_name, offset);
+ report_difference (¤t_stat_info, NULL);
+ return;
+ }
- if ((current_stat_info.stat.st_mode & MODE_ALL) != (stat_data.st_mode & MODE_ALL))
- {
- report_difference (¤t_stat_info, _("Mode differs"));
- break;
- }
+ read_and_process (¤t_stat_info, process_rawdata);
- break;
+ status = close (fd);
+ if (status != 0)
+ close_error (current_stat_info.file_name);
+}
- case GNUTYPE_VOLHDR:
- break;
+/* Diff a file against the archive. */
+void
+diff_archive (void)
+{
- case GNUTYPE_MULTIVOL:
- {
- off_t offset;
+ set_next_block_after (current_header);
- if (current_stat_info.had_trailing_slash)
- goto really_dir;
+ /* Print the block from current_header and current_stat_info. */
- if (!get_stat_data (current_stat_info.file_name, &stat_data))
- break;
+ if (verbose_option)
+ {
+ if (now_verifying)
+ fprintf (stdlis, _("Verify "));
+ print_header (¤t_stat_info, current_header, -1);
+ }
- if (!S_ISREG (stat_data.st_mode))
- {
- report_difference (¤t_stat_info, _("File type differs"));
- skip_member ();
- break;
- }
+ switch (current_header->header.typeflag)
+ {
+ default:
+ ERROR ((0, 0, _("%s: Unknown file type `%c', diffed as normal file"),
+ quotearg_colon (current_stat_info.file_name),
+ current_header->header.typeflag));
+ /* Fall through. */
- offset = OFF_FROM_HEADER (current_header->oldgnu_header.offset);
- if (stat_data.st_size != current_stat_info.stat.st_size + offset)
- {
- report_difference (¤t_stat_info, _("Size differs"));
- skip_member ();
- break;
- }
+ case AREGTYPE:
+ case REGTYPE:
+ case GNUTYPE_SPARSE:
+ case CONTTYPE:
- diff_handle = open (current_stat_info.file_name, O_RDONLY | O_BINARY);
+ /* Appears to be a file. See if it's really a directory. */
- if (diff_handle < 0)
- {
- open_error (current_stat_info.file_name);
- report_difference (¤t_stat_info, NULL);
- skip_member ();
- break;
- }
+ if (current_stat_info.had_trailing_slash)
+ diff_dir ();
+ else
+ diff_file ();
+ break;
- if (lseek (diff_handle, offset, SEEK_SET) < 0)
- {
- seek_error_details (current_stat_info.file_name, offset);
- report_difference (¤t_stat_info, NULL);
- break;
- }
+ case LNKTYPE:
+ diff_link ();
+ break;
- if (multi_volume_option)
- {
- assign_string (&save_name, current_stat_info.file_name);
- save_totsize = stat_data.st_size;
- /* save_sizeleft is set in read_and_process. */
- }
+#ifdef HAVE_READLINK
+ case SYMTYPE:
+ diff_symlink ();
+ break;
+#endif
- read_and_process (current_stat_info.stat.st_size, process_rawdata);
+ case CHRTYPE:
+ case BLKTYPE:
+ case FIFOTYPE:
+ diff_special ();
+ break;
- if (multi_volume_option)
- assign_string (&save_name, 0);
+ case GNUTYPE_DUMPDIR:
+ case DIRTYPE:
+ if (is_dumpdir (¤t_stat_info))
+ diff_dumpdir ();
+ diff_dir ();
+ break;
- status = close (diff_handle);
- if (status != 0)
- close_error (current_stat_info.file_name);
+ case GNUTYPE_VOLHDR:
+ break;
- break;
- }
+ case GNUTYPE_MULTIVOL:
+ diff_multivol ();
}
}
flush_read ();
while (1)
{
- enum read_header status = read_header (false);
+ enum read_header status = read_header (¤t_header,
+ ¤t_stat_info,
+ read_header_auto);
if (status == HEADER_FAILURE)
{
{
counter++;
set_next_block_after (current_header);
- status = read_header (false);
+ status = read_header (¤t_header, ¤t_stat_info,
+ read_header_auto);
}
while (status == HEADER_FAILURE);
"VERIFY FAILURE: %d invalid headers detected",
counter), counter));
}
- if (status == HEADER_ZERO_BLOCK || status == HEADER_END_OF_FILE)
+ if (status == HEADER_END_OF_FILE)
break;
+ if (status == HEADER_ZERO_BLOCK)
+ {
+ set_next_block_after (current_header);
+ if (!ignore_zeros_option)
+ {
+ char buf[UINTMAX_STRSIZE_BOUND];
+
+ status = read_header (¤t_header, ¤t_stat_info,
+ read_header_auto);
+ if (status == HEADER_ZERO_BLOCK)
+ break;
+ WARNOPT (WARN_ALONE_ZERO_BLOCK,
+ (0, 0, _("A lone zero block at %s"),
+ STRINGIFY_BIGINT (current_block_ordinal (), buf)));
+ }
+ }
diff_archive ();
tar_stat_destroy (¤t_stat_info);
- xheader_destroy (&extended_header);
}
access_mode = ACCESS_WRITE;
projects / chaz / tar / blobdiff