$ git clone -n https://src.fedoraproject.org/rpms/jaxb-fi.git /var/lib/mock/f38-build-side-42-init-devel-773014-27763/root/chroot_tmpdir/scmroot/jaxb-fi
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-773014-27763/root/chroot_tmpdir/scmroot/jaxb-fi'...
$ git fetch origin b92e33fbd9c83dbbd78af66d4ee26baabbbc16db:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jaxb-fi
 * [new ref]         b92e33fbd9c83dbbd78af66d4ee26baabbbc16db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b92e33f Change licence, reorganize subpackages