This article describes how to run two independent NixOS installations on a single machine, each with its own root partition but sharing a single /boot. It walks through why NixOS Containers and System Specialisation weren’t a good fit, and how patching the systemd-boot NixOS module — adding a configurable boot-entry prefix and an option to skip managing loader.conf — lets each instance keep its own EFI folder and loader entries without stepping on the other. It closes with practical safety tips and a known limitation around duplicate NVRAM boot entries.

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Cleaning up branches and setting up partial clone on the nixpkgs repo, and chasing a phantom Display Port failure through a NixOS flake update.

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