$ git clone -n https://src.fedoraproject.org/rpms/antlr4-project.git /var/lib/mock/f41-build-side-2-python-2692308-30264/root/chroot_tmpdir/scmroot/antlr4-project
Cloning into '/var/lib/mock/f41-build-side-2-python-2692308-30264/root/chroot_tmpdir/scmroot/antlr4-project'...
$ git fetch origin 63134b6dc20b8fdc3be82f8f3258b603779f4515:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/antlr4-project
 * [new ref]         63134b6dc20b8fdc3be82f8f3258b603779f4515 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63134b6 Version 4.13.2