$ git clone -n https://src.fedoraproject.org/rpms/cpanspec.git /var/lib/mock/f45-build-5017-337/root/chroot_tmpdir/scmroot/cpanspec
Cloning into '/var/lib/mock/f45-build-5017-337/root/chroot_tmpdir/scmroot/cpanspec'...
$ git fetch origin 126ebd74ac36be6e50df1e172ec6b6933bad3a95:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cpanspec
 * [new ref]         126ebd74ac36be6e50df1e172ec6b6933bad3a95 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 126ebd7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild