$ git clone -n https://src.fedoraproject.org/rpms/jaxb-stax-ex.git /var/lib/mock/f40-build-2192699-51471/root/chroot_tmpdir/scmroot/jaxb-stax-ex
Cloning into '/var/lib/mock/f40-build-2192699-51471/root/chroot_tmpdir/scmroot/jaxb-stax-ex'...
$ git fetch origin a4a30be6566fb79b6a457b0b43449648fe7f965b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jaxb-stax-ex
 * [new ref]         a4a30be6566fb79b6a457b0b43449648fe7f965b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a4a30be Update javapackages test plan to f40