$ git clone -n https://src.fedoraproject.org/rpms/ghc-criterion.git /var/lib/mock/f41-build-side-1-2908457-34741/root/chroot_tmpdir/scmroot/ghc-criterion
Cloning into '/var/lib/mock/f41-build-side-1-2908457-34741/root/chroot_tmpdir/scmroot/ghc-criterion'...
$ git fetch origin 5018d57fcee34a2dad2d0a5c57c83ee5aa3a2f35:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-criterion
 * [new ref]         5018d57fcee34a2dad2d0a5c57c83ee5aa3a2f35 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5018d57 update to 1.6.3.0