$ git clone -n https://src.fedoraproject.org/rpms/jaxb-api.git /var/lib/mock/f41-build-1293933-23384/root/chroot_tmpdir/scmroot/jaxb-api
Cloning into '/var/lib/mock/f41-build-1293933-23384/root/chroot_tmpdir/scmroot/jaxb-api'...
$ git fetch origin 83d68f75cb2a1f6faeec72fc717342a80775bb9f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jaxb-api
 * [new ref]         83d68f75cb2a1f6faeec72fc717342a80775bb9f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 83d68f7 Update to upstream version 4.0.2