$ git clone -n https://src.fedoraproject.org/rpms/ghc-happstack-server.git /var/lib/mock/f38-build-side-42-init-devel-1023041-29659/root/chroot_tmpdir/scmroot/ghc-happstack-server
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1023041-29659/root/chroot_tmpdir/scmroot/ghc-happstack-server'...
$ git fetch origin 208398effd78131b67eb00775c1dec233bfaf768:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-happstack-server
 * [new ref]         208398effd78131b67eb00775c1dec233bfaf768 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 208398e Convert to %autorelease and %autochangelog