$ git clone -n https://src.fedoraproject.org/rpms/ghc-HTTP.git /var/lib/mock/f41-build-side-1-2805247-32863/root/chroot_tmpdir/scmroot/ghc-HTTP
Cloning into '/var/lib/mock/f41-build-side-1-2805247-32863/root/chroot_tmpdir/scmroot/ghc-HTTP'...
$ git fetch origin 34a5cf9b56fc1d2ae44e42e1589ca3ca3db89ea3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-HTTP
 * [new ref]         34a5cf9b56fc1d2ae44e42e1589ca3ca3db89ea3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 34a5cf9 bump release