$ git clone -n https://src.fedoraproject.org/rpms/ghc-hslua.git /var/lib/mock/f41-build-840273-160595/root/chroot_tmpdir/scmroot/ghc-hslua
Cloning into '/var/lib/mock/f41-build-840273-160595/root/chroot_tmpdir/scmroot/ghc-hslua'...
$ git fetch origin 4b195c9c7dd72e9bba278a72c514e8ffeb957b16:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-hslua
 * [new ref]         4b195c9c7dd72e9bba278a72c514e8ffeb957b16 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b195c9 update to 2.3.1