$ git clone -n https://src.fedoraproject.org/rpms/ghc-zlib.git /var/lib/mock/f41-build-839610-160255/root/chroot_tmpdir/scmroot/ghc-zlib
Cloning into '/var/lib/mock/f41-build-839610-160255/root/chroot_tmpdir/scmroot/ghc-zlib'...
$ git fetch origin eb492715902e5a59e9cbe36bebb3ad4c321d75f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-zlib
 * [new ref]         eb492715902e5a59e9cbe36bebb3ad4c321d75f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eb49271 revise .cabal file