$ git clone -n https://src.fedoraproject.org/rpms/mariadb-java-client.git /var/lib/mock/f40-build-2219914-52644/root/chroot_tmpdir/scmroot/mariadb-java-client
Cloning into '/var/lib/mock/f40-build-2219914-52644/root/chroot_tmpdir/scmroot/mariadb-java-client'...
$ git fetch origin 384925240b97f76fc6c6614b5fe166818bc942d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mariadb-java-client
 * [new ref]         384925240b97f76fc6c6614b5fe166818bc942d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3849252 rebase to upstream version 3.3.2