tar: fix --verify option, which broke in 1.24

* NEWS: Document this.
* src/compare.c (verify_volume): Decode the header before invoking
diff_archive, as diff_archive no longer does this as of the
2010-06-28 commit.  Also, don't try to invoke diff_archive on a
zero block.
* tests/Makefile.am (TESTSUITE_AT): Add verify.at.
* tests/testsuite.at: Include verify.at.
* tests/verify.at: New file.

NEWS

@@ -1,6 +1,12 @@
-GNU tar NEWS - User visible changes. 2010-11-07
+GNU tar NEWS - User visible changes. 2010-11-14
 Please send GNU tar bug reports to <[email protected]>
 
+
+version 1.25.90 - (Git)
+
+* Bugfixes
+** Fix the --verify option, which broke in version 1.24.
+
 
 version 1.25 - Sergey Poznyakoff, 2010-11-07
 
@@ -27,7 +33,7 @@ are met, tar retries extraction using an alternative decompressor:
  2. The compression program was not explicitly requested in the command
  line by the use of such options as -z, -j, etc.
 
-For example, if `compress' is not available, tar will try `gzip'. 
+For example, if `compress' is not available, tar will try `gzip'.
 
 
 version 1.24 - Sergey Poznyakoff, 2010-10-24

src/compare.c

@@ -611,8 +611,10 @@ verify_volume (void)
 		       (0, 0, _("A lone zero block at %s"),
 			STRINGIFY_BIGINT (current_block_ordinal (), buf)));
             }
+	  continue;
 	}
 
+      decode_header (current_header, &current_stat_info, &current_format, 1);
       diff_archive ();
       tar_stat_destroy (&current_stat_info);
     }

tests/Makefile.am

@@ -157,6 +157,7 @@ TESTSUITE_AT = \
  volsize.at\
  volume.at\
  verbose.at\
+ verify.at\
  version.at\
  xform-h.at\
  xform01.at\

tests/testsuite.at

@@ -232,6 +232,8 @@ m4_include([update.at])
 m4_include([update01.at])
 m4_include([update02.at])
 
+m4_include([verify.at])
+
 m4_include([volume.at])
 m4_include([volsize.at])
 

tests/verify.at

@@ -0,0 +1,37 @@
+# Process this file with autom4te to create testsuite. -*- Autotest -*-
+
+# Test suite for GNU tar.
+# Copyright (C) 2010 Free Software Foundation, Inc.
+
+# 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 3, or (at your option)
+# any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# 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., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+
+# Check that tar --verify works.
+# Problem reported by Gilles Espinasse in
+# <http://lists.gnu.org/archive/html/bug-tar/2010-11/msg00065.html>.
+
+AT_SETUP([verify])
+AT_KEYWORDS([verify])
+
+AT_TAR_CHECK([
+touch foo
+tar -cvf archive.tar --verify foo
+],
+[0],
+[foo
+Verify foo
+])
+
+AT_CLEANUP