Bazaar doesn't support .tar.xz

[TDJACR]

I've noticed many distributions of Linux starting to support and use .tar.xz for various utilities. It'd be great if the export command were to accept such a function.

[TDJACR (thedjatclubrock)]

Looking at the code more closely, it appears if that part of the export function is implemented with the python tarfile library, which doesn't appear to support .xz at the moment. Continuing to investigate further.

[TDJACR (thedjatclubrock)]

Feature request upstream: http://bugs.python.org/issue8266 for the tarfile library and http://bugs.python.org/issue6715 for xz in general. Suggested they take a look at https://launchpad.net/pyliblzma

[TDJACR (thedjatclubrock)]

Linked to a completed branch pending inclusion in Python's tarfile library in the same manner as gzip ang bzip2.

[TDJACR (thedjatclubrock)]

The upstream bug was a duplicate, see http://bugs.python.org/issue5689 for the main discussion.

[TDJACR (thedjatclubrock)]

=== modified file 'bzrlib/export/__init__.py'
--- bzrlib/export/__init__.py 2010-03-25 09:39:03 +0000
+++ bzrlib/export/__init__.py 2010-03-30 14:50:10 +0000
@@ -181,5 +181,6 @@
 register_lazy_exporter('tar', ['.tar'], 'bzrlib.export.tar_exporter', 'tar_exporter')
 register_lazy_exporter('tgz', ['.tar.gz', '.tgz'], 'bzrlib.export.tar_exporter', 'tgz_exporter')
 register_lazy_exporter('tbz2', ['.tar.bz2', '.tbz2'], 'bzrlib.export.tar_exporter', 'tbz_exporter')
+register_lazy_exporter('txz', ['.tar.xz', '.txz'], 'bzrlib.export.tar_exporter', 'txz_exporter')
 register_lazy_exporter('zip', ['.zip'], 'bzrlib.export.zip_exporter', 'zip_exporter')

=== modified file 'bzrlib/export/tar_exporter.py'
--- bzrlib/export/tar_exporter.py 2010-03-25 09:39:03 +0000
+++ bzrlib/export/tar_exporter.py 2010-03-30 14:50:25 +0000
@@ -102,3 +102,11 @@
                  per_file_timestamps=False):
     tar_exporter(tree, dest, root, subdir, compression='bz2',
                  filtered=filtered, per_file_timestamps=per_file_timestamps)
+
+
+def txz_exporter(tree, dest, root, subdir, filtered=False,
+ per_file_timestamps=False):
+ tar_exporter(tree, dest, root, subdir, compression='xz',
+ filtered=filtered, per_file_timestamps=per_file_timestamps)
+
+

[Martin Pool (mbp)]

Thanks for that.

We should probably add a test for this, which can check both that it
works if xz is supported, and that it fails cleanly if you're using a
Python without it. Please have a look in the existing test_export.

--
Martin <http://launchpad.net/~mbp/>

[TDJACR (thedjatclubrock)]

Taking a look right now -- if I understand correctly, xz isn't supported in Python at all at the moment, and that patch would only work pending xz's inclusion in the tarfile library in the same manner as gz and bz2.

Thanks

[Martin Pool (mbp)]

On 31 March 2010 12:00, TDJACR <email address hidden> wrote:
> Taking a look right now -- if I understand correctly, xz isn't supported
> in Python at all at the moment, and that patch would only work pending
> xz's inclusion in the tarfile library in the same manner as gz and bz2.

If you wanted you could try running xz as a subprocess, so this could
work on any Python if you have the program installed...

--
Martin <http://launchpad.net/~mbp/>