$ git clone -n https://src.fedoraproject.org/rpms/gkrellm.git /var/lib/mock/f45-build-11198-428/root/chroot_tmpdir/scmroot/gkrellm
Cloning into '/var/lib/mock/f45-build-11198-428/root/chroot_tmpdir/scmroot/gkrellm'...
$ git fetch origin 44d2b2aafb1a3c43e1275d3f3c9dee0c86ea2d4f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gkrellm
 * [new ref]         44d2b2aafb1a3c43e1275d3f3c9dee0c86ea2d4f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 44d2b2a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild