$ git clone -n https://src.fedoraproject.org/rpms/mediawiki-wikicalendar.git /var/lib/mock/f45-build-18216-511/root/chroot_tmpdir/scmroot/mediawiki-wikicalendar
Cloning into '/var/lib/mock/f45-build-18216-511/root/chroot_tmpdir/scmroot/mediawiki-wikicalendar'...
$ git fetch origin 49eaf5abd4afe2564e0307eca646175302a8381d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mediawiki-wikicalendar
 * [new ref]         49eaf5abd4afe2564e0307eca646175302a8381d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 49eaf5a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild