$ git clone -n https://src.fedoraproject.org/rpms/sanlock.git /var/lib/mock/f40-build-2224805-52792/root/chroot_tmpdir/scmroot/sanlock
Cloning into '/var/lib/mock/f40-build-2224805-52792/root/chroot_tmpdir/scmroot/sanlock'...
$ git fetch origin 03a2576283eeb3a6848d277e28bb8d52b3953fa3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sanlock
 * [new ref]         03a2576283eeb3a6848d277e28bb8d52b3953fa3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 03a2576 new upstream release