This repository contains the Nix / NixOS configuration for all of my systems. See nixos-unified—specifically nixos-unified-template—if you wish to create your own configuration from scratch.

Setup

To use this repository as base configuration for your new machine running:

NixOS Linux

Tip

For a general tutorial, see https://nixos.asia/en/nixos-install-flake

• Install NixOS
  • Hetzner dedicated from Linux Rescue system: https://github.com/numtide/nixos-anywhere (see blog post; example PR: #35 where I had to configure networking manually)
    • Copy from existing configuration (eg: ax41.nix)
    • Make networking configuration changes.
    • Run nixos-anywhere from a Linux system, targetting root@<ip>
    • Wait for reboot; ssh srid@<ip>; profit!
  • Digital Ocean
    • Legacy/manual approach: nixos-infect
    • Modern/automate approach: Custom image + colerama; cf. Zulip and example
  • X1 Carbon: https://srid.ca/x1c7-install
  • Windows (via WSL): https://github.com/nix-community/NixOS-WSL
• Clone this repo anywhere
• Rename ./configurations/nixos/??.nix to match your current system hostname
• Edit config.nix to set your primary user information
• Run nix run. That's it. Re-open your terminal.

macOS

• Install Nix
• Clone this repo anywhere
• Rename ./configurations/darwin/??.nix to match your current system hostname
• Edit config.nix to set your primary user information
• Run nix run.¹ That's it. Re-open your terminal.

Architecture

Start from flake.nix (see Flakes). flake-parts is used as the module system.

Directory layout

Tip

See flake-module.nix for autowiring of flake outputs based on this directory structure.

Path	Corresponding flake output
./configurations/{nixos,darwin,home}/foo.nix	{nixos,darwin,home}Configurations.foo
./mdules/{nixos,darwin,home,flake-parts}/foo.nix	{nixos,darwin,home,flake}Modules.foo
./overlays/foo.nix	overlays.foo
./packages	N/A (Nix packages)
./secrets	N/A (agenix data)

Tips

• To update NixOS (and other inputs) run nix flake update
  • You may also update a subset of inputs, e.g.

    nix flake lock --update-input nixpkgs --update-input darwin --update-input home-manager
    # Or, `nix run .#update`

• To free up disk space,

  sudo nix-env -p /nix/var/nix/profiles/system --delete-generations +2
  sudo nixos-rebuild boot

• To autoformat the project tree using nixpkgs-fmt, run nix fmt.
• To build all flake outputs (locally or in CI), run nix --accept-flake-config run github:juspay/omnix ci build
• For secrets management, I use agenix, because it works with SSH keys, and functions well on macOS and NixOS.

Discussion

If you wish to discuss about this config, join the Zulip.

Footnotes

1. You might have to rm -rf /etc/nix/nix.conf, so our flake.nix can do its thing. ↩