downloadunpacked: fix extraction of symlinks when using an external decompressor

slapos/recipe/downloadunpacked.py

@@ -29,6 +29,7 @@ import os
 import subprocess
 import tarfile
 import tempfile
+from functools import partial
 from setuptools import archive_util
 from . import is_true, EnvironMixin, Shared
 
@@ -118,8 +119,8 @@ def unpack_archive(recipe, *args):
                 with tempfile.NamedTemporaryFile() as uncompressed_archive:
                     subprocess.check_call(cmd + (filename,),
                         stdout=uncompressed_archive, env=recipe.environ)
-                    archive_util.unpack_archive(
-                        uncompressed_archive.name, extract_dir, progress_filter)
+                    unpack_archive(uncompressed_archive.name,
+                                   extract_dir, progress_filter)
                 return True
         raise archive_util.UnrecognizedFormat(
             "%s is not a compressed or uncompressed tar file" % (filename,)
@@ -149,5 +150,6 @@ def unpack_archive(recipe, *args):
                             pass
         return True
 
-  return archive_util.unpack_archive(*args,
+  unpack_archive = partial(archive_util.unpack_archive,
     drivers = archive_util.extraction_drivers[:2] + (unpack_tarfile_patched,))
+  return unpack_archive(*args)