Xz supports all archive commands.

doc/changelog.txt

@@ -1,3 +1,11 @@
+0.14 "" (released xx.xx.2011)
+
+  * Handle CRX (.crx) files as ZIP archives. They have garbage at
+    the beginning of the file, but some unzip programs can cope with
+    that.
+  * The xz program supports listing of XZ archives. Adjust the
+    configuration accordingly.
+
 0.13 "Megamind" (released 25.1.2011)
 
   * Fix command argument order when extracting cpio archives.

patoolib/__init__.py

@@ -188,10 +188,7 @@ ArchivePrograms = {
         'create': ('rzip',),
     },
     'xz': {
-        'extract': ('xz',),
-        'list': ('echo',),
-        'test': ('xz',),
-        'create': ('xz',),
+        None: ('xz',),
     },
     'zoo': {
         None: ('zoo',),
@@ -415,12 +412,7 @@ def _handle_archive (archive, command, *args, **kwargs):
     if command == 'create' and os.path.exists(archive):
         raise util.PatoolError("archive `%s' already exists" % archive)
     program = config['program']
-    # get python module for given archive program
-    key = util.stripext(os.path.basename(program).lower())
-    module = ProgramModules.get(key, key)
-    # import archive handler (eg. patoolib.programs.star.extract_tar())
-    exec "from patoolib.programs.%s import %s_%s as func" % (module, command, format)
-    get_archive_cmdlist = locals()['func']
+    get_archive_cmdlist = get_archive_cmdlist_func(program, command, format)
     # prepare keyword arguments for command list
     cmd_kwargs = dict(verbose=config['verbose'])
     origarchive = None
@@ -456,6 +448,20 @@ def _handle_archive (archive, command, *args, **kwargs):
                 pass
 
 
+def get_archive_cmdlist_func (program, command, format):
+    # get python module for given archive program
+    key = util.stripext(os.path.basename(program).lower())
+    module = ProgramModules.get(key, key)
+    # import archive handler function (eg. patoolib.programs.star.extract_tar)
+    args = (module, command, format)
+    import_cmd = "from patoolib.programs.%s import %s_%s as func" % args
+    try:
+        exec import_cmd
+    except ImportError:
+        raise util.PatoolError('ImportError executing %r' % import_cmd)
+    return locals()['func']
+
+
 def handle_archive (archive, command, *args, **kwargs):
     """Handle archive file command; with nice error reporting."""
     try:

tests/test_archives.py

@@ -339,9 +339,7 @@ class TestArchives (ArchiveTest):
     @needs_program('xz')
     def test_xz (self):
         self.program = 'xz'
-        self.archive_test('t .xz')
-        self.archive_extract('t .xz')
-        self.archive_create('t .xz', singlefile=True)
+        self.archive_commands('t .xz', singlefile=True)
 
     @needs_program('lha')
     def test_lha (self):

tests/test_archives2.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2010-2011 Bastian Kleineidam
+#
+# 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 of the License, 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, see <http://www.gnu.org/licenses/>.
+from tests import ArchiveTest, needs_os, needs_program, needs_codec
+
+class TestArchives (ArchiveTest):
+
+    @needs_codec('tar', 'lzma')
+    def test_tar_lzma (self):
+        self.program = 'tar'
+        archive = 't.tar.lzma'
+        self.archive_commands(archive)
+