$ git clone -n https://src.fedoraproject.org/rpms/ghc-rpm-nvr.git /var/lib/mock/f41-build-839429-160145/root/chroot_tmpdir/scmroot/ghc-rpm-nvr
Cloning into '/var/lib/mock/f41-build-839429-160145/root/chroot_tmpdir/scmroot/ghc-rpm-nvr'...
$ git fetch origin 5a8cae23b023b1a1518f7ed4db96202f8b163c0e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-rpm-nvr
 * [new ref]         5a8cae23b023b1a1518f7ed4db96202f8b163c0e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a8cae2 bump release