$ git clone -n https://src.fedoraproject.org/rpms/haskell-platform.git /var/lib/mock/f38-build-side-42-init-devel-1380371-30706/root/chroot_tmpdir/scmroot/haskell-platform
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1380371-30706/root/chroot_tmpdir/scmroot/haskell-platform'...
$ git fetch origin 86537fd1d30adec50d3890991f7402d91565a1e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/haskell-platform
 * [new ref]         86537fd1d30adec50d3890991f7402d91565a1e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86537fd backport 6280.patch to 2.9.1