$ git clone -n https://src.fedoraproject.org/rpms/rubygem-method_source.git /var/lib/mock/f45-build-35090-693/root/chroot_tmpdir/scmroot/rubygem-method_source
Cloning into '/var/lib/mock/f45-build-35090-693/root/chroot_tmpdir/scmroot/rubygem-method_source'...
$ git fetch origin d1f15e9f3df6c6be5dea49bc7862c9ba337da2b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-method_source
 * [new ref]         d1f15e9f3df6c6be5dea49bc7862c9ba337da2b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d1f15e9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild