$ git clone -n https://src.fedoraproject.org/rpms/java_cup.git /var/lib/mock/f41-build-side-1-2751200-31096/root/chroot_tmpdir/scmroot/java_cup
Cloning into '/var/lib/mock/f41-build-side-1-2751200-31096/root/chroot_tmpdir/scmroot/java_cup'...
$ git fetch origin 497639daca1e0c1a097f3100c4f62f32b0192375:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/java_cup
 * [new ref]         497639daca1e0c1a097f3100c4f62f32b0192375 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 497639d Convert to %autorelease and %autochangelog