$ git clone -n https://src.fedoraproject.org/rpms/java-latest-openjdk.git /var/lib/mock/f41-build-750634-13382/root/chroot_tmpdir/scmroot/java-latest-openjdk
Cloning into '/var/lib/mock/f41-build-750634-13382/root/chroot_tmpdir/scmroot/java-latest-openjdk'...
$ git fetch origin 7860d91899a9869ac779a885002fa98a64422c9c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/java-latest-openjdk
 * [new ref]         7860d91899a9869ac779a885002fa98a64422c9c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7860d91 repacking april CPU portables