$ git clone -n https://src.fedoraproject.org/rpms/chrony.git /var/lib/mock/f41-build-side-1-2633041-25881/root/chroot_tmpdir/scmroot/chrony
Cloning into '/var/lib/mock/f41-build-side-1-2633041-25881/root/chroot_tmpdir/scmroot/chrony'...
$ git fetch origin 73179b1fbd3f2e049997a996781663b4ecb1ad87:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/chrony
 * [new ref]         73179b1fbd3f2e049997a996781663b4ecb1ad87 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 73179b1 4.6-1