$ git clone -n https://src.fedoraproject.org/rpms/ghc-happstack-server.git /var/lib/mock/f40-build-744048-111535/root/chroot_tmpdir/scmroot/ghc-happstack-server
Cloning into '/var/lib/mock/f40-build-744048-111535/root/chroot_tmpdir/scmroot/ghc-happstack-server'...
$ git fetch origin a8a9fdda6aea98ea6c37ddf26600301a6c9458cc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-happstack-server
 * [new ref]         a8a9fdda6aea98ea6c37ddf26600301a6c9458cc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a8a9fdd https://hackage.haskell.org/package/happstack-server-7.8.0.2/changelog