Correctly store long sparse file names in PAX archives.

* src/sparse.c (pax_dump_header_1): Make sure the created header name is
shorter than NAME_FIELD_SIZE bytes.
* tests/sparse04.at: New testcase.
* tests/Makefile.am (TESTSUITE_AT): Add sparse04.at.
* tests/testsuite.at: Include sparse04.at.
* NEWS: Update.

NEWS

@@ -1,4 +1,4 @@
-GNU tar NEWS - User visible changes. 2010-11-14
+GNU tar NEWS - User visible changes. 2010-11-27
 Please send GNU tar bug reports to <bug-tar@gnu.org>
 
 
@@ -6,6 +6,7 @@ version 1.25.90 - (Git)
 
 * Bugfixes
 ** Fix the --verify option, which broke in version 1.24.
+** Fix storing long sparse file names in PAX archives.
 
 
 version 1.25 - Sergey Poznyakoff, 2010-11-07

src/sparse.c

@@ -991,7 +991,7 @@ pax_dump_header_1 (struct tar_sparse_file *file)
   off_t size = 0;
   struct sp_array *map = file->stat_info->sparse_map;
   char *save_file_name = file->stat_info->file_name;
-
+  
 #define COPY_STRING(b,dst,src) do                \
  {                                               \
    char *endp = b->buffer + BLOCKSIZE;           \
@@ -1029,8 +1029,11 @@ pax_dump_header_1 (struct tar_sparse_file *file)
   xheader_store ("GNU.sparse.name", file->stat_info, NULL);
   xheader_store ("GNU.sparse.realsize", file->stat_info, NULL);
 
-  file->stat_info->file_name = xheader_format_name (file->stat_info,
+  file->stat_info->file_name =
-					    "%d/GNUSparseFile.%p/%f", 0);
+    xheader_format_name (file->stat_info, "%d/GNUSparseFile.%p/%f", 0);
+  /* Make sure the created header name is shorter than NAME_FIELD_SIZE: */
+  if (strlen (file->stat_info->file_name) > NAME_FIELD_SIZE)
+    file->stat_info->file_name[NAME_FIELD_SIZE] = 0;
 
   blk = start_header (file->stat_info);
   /* Store the effective (shrunken) file size */

tests/Makefile.am

@@ -146,6 +146,7 @@ TESTSUITE_AT = \
  sparse01.at\
  sparse02.at\
  sparse03.at\
+ sparse04.at\
  sparsemv.at\
  sparsemvp.at\
  spmvp00.at\

tests/sparse04.at

@@ -0,0 +1,47 @@
+# 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.
+
+AT_SETUP([storing long sparse file names])
+AT_KEYWORDS([sparse sparse04])
+
+# Description: Tar versions from 1.15.92 to 1.25 would incorrectly
+# store sparse file names longer than 100 characters in pax mode.
+# Namely, the `path' keyword of the produced PAX header would contain the
+# crafted name of the header itself, instead of that of the file.
+# Reported by: Kamil Dudka <kdudka@redhat.com>
+# References: <201011250026.44908.kdudka@redhat.com>,
+#             http://lists.gnu.org/archive/html/bug-tar/2010-11/msg00099.html
+
+m4_define([NAME_111],
+	  [123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960])
+
+AT_TAR_CHECK([
+genfile --sparse --file NAME_111 --block-size 512 8M A || AT_SKIP_TEST
+tar -c --sparse --posix NAME_111 | tar t
+],
+[0],
+[NAME_111
+],
+[],
+[],
+[],
+[pax])
+
+AT_CLEANUP

tests/testsuite.at

@@ -232,6 +232,7 @@ m4_include([shortrec.at])
 m4_include([sparse01.at])
 m4_include([sparse02.at])
 m4_include([sparse03.at])
+m4_include([sparse04.at])
 m4_include([sparsemv.at])
 m4_include([spmvp00.at])
 m4_include([spmvp01.at])