$ git clone -n https://src.fedoraproject.org/rpms/obs-service-recompress.git /var/lib/mock/f45-build-20421-570/root/chroot_tmpdir/scmroot/obs-service-recompress
Cloning into '/var/lib/mock/f45-build-20421-570/root/chroot_tmpdir/scmroot/obs-service-recompress'...
$ git fetch origin 7f32ab5def8470c181729c9c6b44c15603256083:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/obs-service-recompress
 * [new ref]         7f32ab5def8470c181729c9c6b44c15603256083 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7f32ab5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild