$ git clone -n https://src.fedoraproject.org/rpms/kdegraphics-thumbnailers.git /var/lib/mock/f42-build-3279313-41337/root/chroot_tmpdir/scmroot/kdegraphics-thumbnailers
Cloning into '/var/lib/mock/f42-build-3279313-41337/root/chroot_tmpdir/scmroot/kdegraphics-thumbnailers'...
$ git fetch origin eb33ff5a1f8192526f13a93dc7c21e16ed3a0137:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kdegraphics-thumbnailers
 * [new ref]         eb33ff5a1f8192526f13a93dc7c21e16ed3a0137 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eb33ff5 Rebuild for ppc64le enablement