(diff_dumpdir): Compare directory contents using

[chaz/tar] / src / compare.c

diff --git a/src/compare.c b/src/compare.c
index 5445ac07257698c4cace1435d3bdf424969f85b0..2163a29421770af2b50918d4a0f22fdf802b4676 100644 (file)
--- a/src/compare.c
+++ b/src/compare.c
@@ -1,7 +1,7 @@
 /* Diff files from a tar archive.
 
    Copyright (C) 1988, 1992, 1993, 1994, 1996, 1997, 1999, 2000, 2001,
-   2003, 2004, 2005 Free Software Foundation, Inc.
+   2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
 
    Written by John Gilmore, on 1987-04-30.
 
@@ -20,6 +20,7 @@
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
 
 #include <system.h>
+#include <system-ioctl.h>
 
 #if HAVE_LINUX_FD_H
 # include <linux/fd.h>
@@ -52,14 +53,13 @@ diff_init (void)
 /* 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);
@@ -110,27 +110,10 @@ process_rawdata (size_t bytes, char *buffer)
   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 (&current_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
@@ -138,8 +121,8 @@ read_and_process (struct tar_stat_info *st, int (*processor) (size_t, char *))
 {
   union block *data_block;
   size_t data_size;
-  size_t size = st->stat.st_size;
-  
+  off_t size = st->stat.st_size;
+
   mv_begin (st);
   while (size)
     {
@@ -224,7 +207,7 @@ diff_file (void)
       if (!sys_compare_gid (&stat_data, &current_stat_info.stat))
        report_difference (&current_stat_info, _("Gid differs"));
 
-      if (tar_timespec_cmp (get_stat_mtime (&stat_data), 
+      if (tar_timespec_cmp (get_stat_mtime (&stat_data),
                             current_stat_info.mtime))
        report_difference (&current_stat_info, _("Mod time differs"));
       if (current_header->header.typeflag != GNUTYPE_SPARSE
@@ -345,6 +328,41 @@ diff_special (void)
     report_difference (&current_stat_info, _("Mode differs"));
 }
 
+static int
+dumpdir_cmp (const char *a, const char *b)
+{
+  size_t len;
+  
+  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;
+       
+      case 'R':
+      case 'T':
+      case 'X':
+       return *b;
+      }
+  return *b;
+}
+
 static void
 diff_dumpdir (void)
 {
@@ -366,9 +384,8 @@ diff_dumpdir (void)
 
   if (dumpdir_buffer)
     {
-      dumpdir_cursor = dumpdir_buffer;
-      read_and_process (&current_stat_info, process_dumpdir);
-      free (dumpdir_buffer);
+      if (dumpdir_cmp (current_stat_info.dumpdir, dumpdir_buffer))
+       report_difference (&current_stat_info, _("Contents differ"));
     }
   else
     read_and_process (&current_stat_info, process_noop);
@@ -423,7 +440,7 @@ diff_multivol (void)
     }
 
   read_and_process (&current_stat_info, process_rawdata);
-  
+
   status = close (fd);
   if (status != 0)
     close_error (current_stat_info.file_name);
@@ -484,10 +501,9 @@ diff_archive (void)
       break;
 
     case GNUTYPE_DUMPDIR:
-      diff_dumpdir ();
-      /* Fall through.  */
-
     case DIRTYPE:
+      if (is_dumpdir (&current_stat_info))
+       diff_dumpdir ();
       diff_dir ();
       break;