$ git clone -n https://src.fedoraproject.org/rpms/ghc-happstack-server.git /var/lib/mock/f41-build-side-1-2908480-34741/root/chroot_tmpdir/scmroot/ghc-happstack-server
Cloning into '/var/lib/mock/f41-build-side-1-2908480-34741/root/chroot_tmpdir/scmroot/ghc-happstack-server'...
$ git fetch origin 9a2e02e4bde9915343c5644434e0304f017d33ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-happstack-server
 * [new ref]         9a2e02e4bde9915343c5644434e0304f017d33ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a2e02e revise .cabal file