$ git clone -n https://src.fedoraproject.org/rpms/mariadb-java-client.git /var/lib/mock/f38-build-side-42-init-devel-784858-27954/root/chroot_tmpdir/scmroot/mariadb-java-client
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-784858-27954/root/chroot_tmpdir/scmroot/mariadb-java-client'...
$ git fetch origin ed2c677bb85827cb556c9755ead779f75b8cb15a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mariadb-java-client
 * [new ref]         ed2c677bb85827cb556c9755ead779f75b8cb15a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ed2c677 Rebase to 3.1.2