$ git clone -n https://src.fedoraproject.org/rpms/ghc-random.git /var/lib/mock/f40-build-1998249-44223/root/chroot_tmpdir/scmroot/ghc-random
Cloning into '/var/lib/mock/f40-build-1998249-44223/root/chroot_tmpdir/scmroot/ghc-random'...
$ git fetch origin 6dcd70ecb9c7bb1660a6b8726dbaca5973643997:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-random
 * [new ref]         6dcd70ecb9c7bb1660a6b8726dbaca5973643997 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6dcd70e bump release