Yes, it will require a plant on the surface of the Moon, but the technological chain is rather short, so maybe it could be somewhat limited in mass. You'll nee

Yes, it will require a plant on the surface of the Moon, but the technological chain is rather short, so maybe it could be somewhat limited in mass. You'll need energy, which could be collected with solar panels, the system, like bulldozers and excavators, for gathering regolith, pulverizing rocks, the reactor, the collector for volatiles, the oxygen separator and oxygen liquifier. Next you'll probably need containers for oxygen, maybe electromagnetic mass driver to accelerate those containers to about 2.4 km/s, which will also need some energy. All these components are rather well known technologically and discussed for long time; I don't remember a forbidding level of energy being mentioned.