$ git clone -n https://src.fedoraproject.org/rpms/objenesis.git /var/lib/mock/f40-build-2140961-50850/root/chroot_tmpdir/scmroot/objenesis
Cloning into '/var/lib/mock/f40-build-2140961-50850/root/chroot_tmpdir/scmroot/objenesis'...
$ git fetch origin 96922059d9d0cc6bcac9e08bf7537b7df05cf87c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/objenesis
 * [new ref]         96922059d9d0cc6bcac9e08bf7537b7df05cf87c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9692205 Update javapackages test plan to f40