$ git clone -n https://src.fedoraproject.org/rpms/rubygem-hoe.git /var/lib/mock/f45-build-34981-692/root/chroot_tmpdir/scmroot/rubygem-hoe
Cloning into '/var/lib/mock/f45-build-34981-692/root/chroot_tmpdir/scmroot/rubygem-hoe'...
$ git fetch origin e4731c3125c102875cbedf3ccc38c4582c1c53fc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-hoe
 * [new ref]         e4731c3125c102875cbedf3ccc38c4582c1c53fc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4731c3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild