$ git clone -n https://src.fedoraproject.org/rpms/java-latest-openjdk-portable.git /var/lib/mock/f42-build-3401495-45130/root/chroot_tmpdir/scmroot/java-latest-openjdk-portable
Cloning into '/var/lib/mock/f42-build-3401495-45130/root/chroot_tmpdir/scmroot/java-latest-openjdk-portable'...
$ git fetch origin 840cb43e58d95bcf925b1f66cfb7bf5d40d7b37e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/java-latest-openjdk-portable
 * [new ref]         840cb43e58d95bcf925b1f66cfb7bf5d40d7b37e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 840cb43 Bumped to 24+36 and built by itself