$ git clone -n https://src.fedoraproject.org/rpms/ghc-warp.git /var/lib/mock/f38-build-side-42-init-devel-959895-28787/root/chroot_tmpdir/scmroot/ghc-warp
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-959895-28787/root/chroot_tmpdir/scmroot/ghc-warp'...
$ git fetch origin ee06c2d109a0990918495f449b9b808a0ee1dd5b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-warp
 * [new ref]         ee06c2d109a0990918495f449b9b808a0ee1dd5b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ee06c2d enable the testsuite