[PATCH] archive: add XZ support if built with Python 3

[David Demelier]

# HG changeset patch
# User David Demelier <markand at malikania.fr>
# Date 1568717251 0
#      Tue Sep 17 10:47:31 2019 +0000
# Node ID c0398aef7f0977b5f076b15638762773dde7d5b6
# Parent  181ee2118a96c4b52bbd6d7b5a47e87f2e1d77e9
archive: add XZ support if built with Python 3

diff -r 181ee2118a96 -r c0398aef7f09 mercurial/archival.py
--- a/mercurial/archival.py	Wed Sep 11 15:03:08 2019 -0700
+++ b/mercurial/archival.py	Tue Sep 17 10:47:31 2019 +0000
@@ -67,6 +67,7 @@
     'tbz2': ['.tbz2', '.tar.bz2'],
     'tgz': ['.tgz', '.tar.gz'],
     'zip': ['.zip'],
+    'txz': ['.txz', '.tar.xz']
     }
 
 def guesskind(dest):
@@ -270,6 +271,7 @@
     'tar': tarit,
     'tbz2': lambda name, mtime: tarit(name, mtime, 'bz2'),
     'tgz': lambda name, mtime: tarit(name, mtime, 'gz'),
+    'txz': lambda name, mtime: tarit(name, mtime, 'xz'),
     'uzip': lambda name, mtime: zipit(name, mtime, False),
     'zip': zipit,
     }
@@ -295,6 +297,9 @@
     subrepos tells whether to include subrepos.
     '''
 
+    if kind == 'txz' and not pycompat.ispy3:
+        raise error.Abort(_('xz compression is only available in Python 3'))
+
     if kind == 'files':
         if prefix:
             raise error.Abort(_('cannot give prefix when archiving to files'))
diff -r 181ee2118a96 -r c0398aef7f09 mercurial/commands.py
--- a/mercurial/commands.py	Wed Sep 11 15:03:08 2019 -0700
+++ b/mercurial/commands.py	Tue Sep 17 10:47:31 2019 +0000
@@ -514,6 +514,7 @@
     :``tar``:   tar archive, uncompressed
     :``tbz2``:  tar archive, compressed using bzip2
     :``tgz``:   tar archive, compressed using gzip
+    :``txz``:   tar archive, compressed using lzma (only in Python 3)
     :``uzip``:  zip archive, uncompressed
     :``zip``:   zip archive, compressed using deflate
 
diff -r 181ee2118a96 -r c0398aef7f09 tests/test-archive.t
--- a/tests/test-archive.t	Wed Sep 11 15:03:08 2019 -0700
+++ b/tests/test-archive.t	Tue Sep 17 10:47:31 2019 +0000
@@ -566,6 +566,21 @@
   *172*80*00:00*old/.hg_archival.txt (glob)
   *0*80*00:00*old/old (glob)
 
+test xz support only available in Python 3.4
+
+#if py3
+  $ hg archive ../archive.txz
+  $ xz -l ../archive.txz | head -n1
+  Strms  Blocks   Compressed Uncompressed  Ratio  Check   Filename (py3 !)
+  $ rm -f ../archive.txz
+#endif
+
+#if no-py3
+  $ hg archive ../archive.txz
+  abort: xz compression is only available in Python 3
+  [255]
+#endif
+
 show an error when a provided pattern matches no files
 
   $ hg archive -I file_that_does_not_exist.foo ../empty.zip
@@ -607,3 +622,4 @@
   456789012
 
   $ cd ..
+