$ git clone -n https://src.fedoraproject.org/rpms/ghc-HUnit.git /var/lib/mock/f40-build-742799-110917/root/chroot_tmpdir/scmroot/ghc-HUnit
Cloning into '/var/lib/mock/f40-build-742799-110917/root/chroot_tmpdir/scmroot/ghc-HUnit'...
$ git fetch origin bc515f8c023b624f362e8d730ead7da1c86cddb7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-HUnit
 * [new ref]         bc515f8c023b624f362e8d730ead7da1c86cddb7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc515f8 bump release