$ git clone -n https://src.fedoraproject.org/rpms/singularity-ce.git /var/lib/mock/f42-build-side-1-3583984-46891/root/chroot_tmpdir/scmroot/singularity-ce
Cloning into '/var/lib/mock/f42-build-side-1-3583984-46891/root/chroot_tmpdir/scmroot/singularity-ce'...
$ git fetch origin dce795b4f5a0cacd587422318aadd271f78914a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/singularity-ce
 * [new ref]         dce795b4f5a0cacd587422318aadd271f78914a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dce795b Merge branch 'rawhide' into f42