$ git clone -n https://src.fedoraproject.org/rpms/obs-service-rust2rpm.git /var/lib/mock/f45-build-20422-570/root/chroot_tmpdir/scmroot/obs-service-rust2rpm
Cloning into '/var/lib/mock/f45-build-20422-570/root/chroot_tmpdir/scmroot/obs-service-rust2rpm'...
$ git fetch origin cf1b53abea28ebfb94f65c08d8f6390617e8cba7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/obs-service-rust2rpm
 * [new ref]         cf1b53abea28ebfb94f65c08d8f6390617e8cba7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cf1b53a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild