$ git clone -n https://src.fedoraproject.org/rpms/ghc-wai-handler-launch.git /var/lib/mock/f41-build-839914-160431/root/chroot_tmpdir/scmroot/ghc-wai-handler-launch
Cloning into '/var/lib/mock/f41-build-839914-160431/root/chroot_tmpdir/scmroot/ghc-wai-handler-launch'...
$ git fetch origin 65cf858b9204c8e9c52db8800a8cace88d897362:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-wai-handler-launch
 * [new ref]         65cf858b9204c8e9c52db8800a8cace88d897362 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 65cf858 revise .cabal file