$ git clone -n https://src.fedoraproject.org/rpms/rubygem-deep_merge.git /var/lib/mock/f45-build-34876-692/root/chroot_tmpdir/scmroot/rubygem-deep_merge
Cloning into '/var/lib/mock/f45-build-34876-692/root/chroot_tmpdir/scmroot/rubygem-deep_merge'...
$ git fetch origin b332144cd9972a8139420db5144deafceb226436:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-deep_merge
 * [new ref]         b332144cd9972a8139420db5144deafceb226436 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b332144 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild