$ git clone -n https://src.fedoraproject.org/rpms/ghc-rio.git /var/lib/mock/f41-build-side-1-2999529-36261/root/chroot_tmpdir/scmroot/ghc-rio
Cloning into '/var/lib/mock/f41-build-side-1-2999529-36261/root/chroot_tmpdir/scmroot/ghc-rio'...
$ git fetch origin c198631324ec050d346fbfbe4cf86efa89988bbd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-rio
 * [new ref]         c198631324ec050d346fbfbe4cf86efa89988bbd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c198631 bump release