$ git clone -n https://src.fedoraproject.org/rpms/singularity-ce.git /var/lib/mock/f40-build-775582-128108/root/chroot_tmpdir/scmroot/singularity-ce
Cloning into '/var/lib/mock/f40-build-775582-128108/root/chroot_tmpdir/scmroot/singularity-ce'...
$ git fetch origin a685e6a47261e4b9a02a5346a26b151a9b4d883c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/singularity-ce
 * [new ref]         a685e6a47261e4b9a02a5346a26b151a9b4d883c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a685e6a Upgrade to 4.0.3 upstream version.