$ git clone -n https://src.fedoraproject.org/rpms/rubygem-multi_test.git /var/lib/mock/f45-build-35111-693/root/chroot_tmpdir/scmroot/rubygem-multi_test
Cloning into '/var/lib/mock/f45-build-35111-693/root/chroot_tmpdir/scmroot/rubygem-multi_test'...
$ git fetch origin ec89366bd2b7182d840b0aae6efa921f4ff5d1ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-multi_test
 * [new ref]         ec89366bd2b7182d840b0aae6efa921f4ff5d1ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ec89366 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild