$ git clone -n https://src.fedoraproject.org/rpms/javacc.git /var/lib/mock/f39-build-1563149-37474/root/chroot_tmpdir/scmroot/javacc
Cloning into '/var/lib/mock/f39-build-1563149-37474/root/chroot_tmpdir/scmroot/javacc'...
$ git fetch origin 06b3e0e5f95b2aec6494feeba1668af60e81c427:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/javacc
 * [new ref]         06b3e0e5f95b2aec6494feeba1668af60e81c427 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 06b3e0e Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild