commit c626c54074b36edb090254fe6f4985bc20893436

Author: Michal Domonkos <mdomonko@redhat.com>

Date:   Thu Mar 23 16:05:16 2017 +0100

    modifyrepo: handle empty file with LZMA. BZ 1287685

    When trying to compress an empty string with LZMA, we will get the

    unfriendly "LZMA.error: unknown error!".  Let's handle this case

    ourselves and raise a more user-friendly error instead.

diff --git a/modifyrepo.py b/modifyrepo.py

index 34b0902..ade5607 100755

--- a/modifyrepo.py

+++ b/modifyrepo.py

@@ -125,6 +125,9 @@ class RepoMetadata:

         else:

             raise MDError, 'invalid metadata type'

+        if not md and self.compress_type == 'xz':

+            raise MDError, 'LZMA does not support compressing empty files'

+

         ## Compress the metadata and move it into the repodata

         mdtype = self._get_mdtype(mdname, mdtype)

         destmd = os.path.join(self.repodir, mdname)