librepo now uses temporary directory in builder's /tmo, instead of buildroot's /tmp, which can lead to mixing two tasks and failing one with
OSError: [Errno unknown] Cannot create directory: /tmp/koji/librepo-markExternalRPMs/repodata: File exists: 'Cannot create output directory'
Metadata Update from @tkopecek: - Issue set to the milestone: 1.17 - Issue tagged with: bug, easyfix
PR #1251
Commit 9728c080 fixes this issue
Commit b78c1b42 fixes this issue
This issue has been migrated to Fedora Forge: https://forge.fedoraproject.org/koji/koji/issues/1250
Please continue any further discussion there.