$ git clone -n https://src.fedoraproject.org/rpms/goddard-backgrounds.git /var/lib/mock/f45-build-11701-434/root/chroot_tmpdir/scmroot/goddard-backgrounds
Cloning into '/var/lib/mock/f45-build-11701-434/root/chroot_tmpdir/scmroot/goddard-backgrounds'...
$ git fetch origin 12411c2969c5f09d2c7a6f0a6e9a3b1c7627c8d6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/goddard-backgrounds
 * [new ref]         12411c2969c5f09d2c7a6f0a6e9a3b1c7627c8d6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 12411c2 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild