$ git clone -n https://src.fedoraproject.org/rpms/antlr3.git /var/lib/mock/f40-build-2421025-60583/root/chroot_tmpdir/scmroot/antlr3
Cloning into '/var/lib/mock/f40-build-2421025-60583/root/chroot_tmpdir/scmroot/antlr3'...
$ git fetch origin e563d7d3f707d2653ee36a968b3e975a313f4aec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/antlr3
 * [new ref]         e563d7d3f707d2653ee36a968b3e975a313f4aec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e563d7d Remove const specifiers from CyclicDFA members