$ git clone -n https://src.fedoraproject.org/rpms/ghc-criterion.git /var/lib/mock/f39-build-1965586-43292/root/chroot_tmpdir/scmroot/ghc-criterion
Cloning into '/var/lib/mock/f39-build-1965586-43292/root/chroot_tmpdir/scmroot/ghc-criterion'...
$ git fetch origin ea0f3d17d7672e6d1ee63e0f4bd0d9bf03bf26a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-criterion
 * [new ref]         ea0f3d17d7672e6d1ee63e0f4bd0d9bf03bf26a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea0f3d1 js-chart now packaged in fedora