Improve one-top-level functionality

Make sure the changes become visible with --show-transformed-names.

* src/common.h (strip_compression_suffix): New function.
(one_top_level): Rename to one_top_level_dir. All uses changed.
* src/extract.c (extr_init): Use strip_compression_suffix.
Bail out if unable to determine top-level directory.
(maybe_prepend_name): Remove. All uses removed.
* src/tar.c (options): --one-top-level takes optional argument.
(parse_opt): Handle it.
* src/list.c (enforce_one_top_level): New function.
(transform_stat_info): Call enforce_one_top_level if required.
* src/suffix.c (compression_suffixes): List "tar" (no compression);
terminate with NULL entry.
(find_compression_suffix): New static.
(strip_compression_suffix): New function.

* doc/tar.1: Update.
* doc/tar.texi: Update.

* tests/onetop01.at: New testcase.
* tests/onetop02.at: New testcase.
* tests/onetop03.at: New testcase.
* tests/Makefile.am: Add new testcases.
* tests/testsuite.at: Likewise.

1 files changed, 45 insertions, 0 deletions

diff --git a/tests/onetop02.at b/tests/onetop02.at
new file mode 100644
index 00000000..454f6928
--- /dev/null
+++ b/tests/onetop02.at
@@ -0,0 +1,45 @@
+# Process this file with autom4te to create testsuite. -*- Autotest -*-
+#
+# Test suite for GNU tar.
+# Copyright 2014 Free Software Foundation, Inc.
+#
+# This file is part of GNU tar.
+#
+# GNU tar 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 of the License, or
+# (at your option) any later version.
+#
+# GNU tar 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, see <http://www.gnu.org/licenses/>.
+#
+AT_SETUP([tar --one-top-level --show-transformed])
+AT_KEYWORDS([extract onetop onetop02])
+
+AT_TAR_CHECK([
+AT_SORT_PREREQ
+mkdir a
+genfile --file a/b
+genfile --file c
+tar cf a.tar a c
+mkdir out
+cd out
+tar --one-top-level --show-transformed  -v -x -f ../a.tar
+find . | sort
+],
+[0],
+[a/
+a/b
+a/c
+.
+./a
+./a/b
+./a/c
+])
+
+AT_CLEANUP