$ git clone -n https://src.fedoraproject.org/rpms/java-latest-openjdk-portable.git /var/lib/mock/f40-build-1737374-24672/root/chroot_tmpdir/scmroot/java-latest-openjdk-portable
Cloning into '/var/lib/mock/f40-build-1737374-24672/root/chroot_tmpdir/scmroot/java-latest-openjdk-portable'...
$ git fetch origin c6f995895733e3a0f58d368f16596c9fa7ee317f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/java-latest-openjdk-portable
 * [new ref]         c6f995895733e3a0f58d368f16596c9fa7ee317f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c6f9958 Updated news