johnos

Personal NixOS + home-manager configuration, managed as a single flake.

Layout

• flake.nix — inputs and a mkHost helper that assembles a nixosConfigurations entry per machine.
• hosts/<name>/ — per-host entry point (configuration.nix) and generated hardware-configuration.nix.
• modules/ — shared NixOS system modules (boot, networking, desktop, hardware, programs, services).
• home/ — home-manager modules, one per program, imported by home.nix.

Adding a new machine: create hosts/<name>/{configuration.nix,hardware-configuration.nix}, then add nixosConfigurations.<name> = mkHost { hostname = "<name>"; }; in flake.nix.

Usage

# Apply the config to the running machine
sudo nixos-rebuild switch --flake .#nixos

# Build without switching, to sanity-check a change
nixos-rebuild build --flake .#nixos

# Format all Nix files
nix fmt

# Evaluate + build everything the flake exposes (what CI runs)
nix flake check --all-systems

# Enter a shell with formatter/linters/nix LSP available
nix develop

CI

• check.yml runs nix flake check on every push/PR — this evaluates and builds the system, so a broken change or dependency bump fails here instead of on the real machine.
• update-flake.yml bumps flake.lock daily and opens a PR (rather than pushing straight to main), so check.yml verifies the bump before it merges.