templates: add 'system-flake' template

flake.nix

@@ -18,6 +18,17 @@
       formatter = (import nixpkgs {inherit system;}).alejandra;
     })
     // {
+      templates = let
+        system-flake = {
+          path = ./templates/system-flake;
+          description = "Opinionated flake for a NixOS system with Home Manager";
+        };
+      in {
+        inherit system-flake;
+
+        default = system-flake;
+      };
+
       overlays = let
         overlay = mapOverlayOverride "trivium" (import ./pkgs);
       in {

templates/system-flake/.gitignore

@@ -0,0 +1,3 @@
+!**/.keep
+result
+flake.lock

templates/system-flake/flake.nix

@@ -0,0 +1,34 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-24.11";
+    unstable.url = "github:nixos/nixpkgs/nixos-unstable";
+
+    home-manager = {
+      url = "github:nix-community/home-manager/release-24.11";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    trivium = {
+      url = "git+https://git.posixlycorrect.com/deepState/trivionomicon.git";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = flakes @ {
+    self,
+    nixpkgs,
+    unstable,
+    home-manager,
+    trivium,
+  }:
+    trivium.lib.mkSystemFlake {
+      system = "x86_64-linux";
+      inherit flakes;
+
+      localOverlayPath = ./pkgs;
+      nixpkgsConfigPath = ./pkgs/config;
+
+      hmSourcePath = ./home;
+      nixosSourcePath = ./sys;
+    };
+}

templates/system-flake/home/default.nix

@@ -0,0 +1,73 @@
+{
+  config,
+  pkgs,
+  ...
+}: {
+  # This value determines the Home Manager release that your configuration is
+  # compatible with. This helps avoid breakage when a new Home Manager release
+  # introduces backwards incompatible changes.
+  #
+  # You should not change this value, even if you update Home Manager. If you do
+  # want to update the value, then make sure to first check the Home Manager
+  # release notes.
+  home.stateVersion = "24.11"; # Please read the comment before changing.
+
+  # The home.packages option allows you to install Nix packages into your
+  # environment.
+  home.packages = [
+    # # Adds the 'hello' command to your environment. It prints a friendly
+    # # "Hello, world!" when run.
+    # pkgs.hello
+
+    # # It is sometimes useful to fine-tune packages, for example, by applying
+    # # overrides. You can do that directly here, just don't forget the
+    # # parentheses. Maybe you want to install Nerd Fonts with a limited number of
+    # # fonts?
+    # (pkgs.nerdfonts.override { fonts = [ "FantasqueSansMono" ]; })
+
+    # # You can also create simple shell scripts directly inside your
+    # # configuration. For example, this adds a command 'my-hello' to your
+    # # environment:
+    # (pkgs.writeShellScriptBin "my-hello" ''
+    #   echo "Hello, ${config.home.username}!"
+    # '')
+  ];
+
+  # Home Manager is pretty good at managing dotfiles. The primary way to manage
+  # plain files is through 'home.file'.
+  home.file = {
+    # # Building this configuration will create a copy of 'dotfiles/screenrc' in
+    # # the Nix store. Activating the configuration will then make '~/.screenrc' a
+    # # symlink to the Nix store copy.
+    # ".screenrc".source = dotfiles/screenrc;
+
+    # # You can also set the file content immediately.
+    # ".gradle/gradle.properties".text = ''
+    #   org.gradle.console=verbose
+    #   org.gradle.daemon.idletimeout=3600000
+    # '';
+  };
+
+  # Home Manager can also manage your environment variables through
+  # 'home.sessionVariables'. These will be explicitly sourced when using a
+  # shell provided by Home Manager. If you don't want to manage your shell
+  # through Home Manager then you have to manually source 'hm-session-vars.sh'
+  # located at either
+  #
+  #  ~/.nix-profile/etc/profile.d/hm-session-vars.sh
+  #
+  # or
+  #
+  #  ~/.local/state/nix/profiles/profile/etc/profile.d/hm-session-vars.sh
+  #
+  # or
+  #
+  #  /etc/profiles/per-user/<user>/etc/profile.d/hm-session-vars.sh
+  #
+  home.sessionVariables = {
+    # EDITOR = "emacs";
+  };
+
+  # Let Home Manager install and manage itself.
+  programs.home-manager.enable = true;
+}

templates/system-flake/home/platform/me@foo/default.nix

@@ -0,0 +1,10 @@
+{
+  config,
+  pkgs,
+  ...
+}: {
+  # Home Manager needs a bit of information about you and the paths it should
+  # manage.
+  home.username = "ale";
+  home.homeDirectory = "/home/ale";
+}

templates/system-flake/pkgs/config/default.nix

@@ -0,0 +1,5 @@
+lib:
+with lib; {
+  android_sdk.accept_license = true;
+  allowUnfreePredicate = pkg: import ./unfree.nix lib (getName pkg);
+}

templates/system-flake/pkgs/config/unfree.nix

@@ -0,0 +1,7 @@
+lib: name:
+with lib;
+  elem name [
+    "libproprietary-v3"
+    "closed-source-pkg"
+    "favorite-abandonware"
+  ]

templates/system-flake/pkgs/default.nix

@@ -0,0 +1,12 @@
+final: prev:
+with prev.lib; let
+  inherit (final) callPackage fetchpatch;
+in {
+  lib = callPackage ./lib {};
+
+  hello-world = callPackage ./hello-world {};
+
+  override = {
+    sl = prev.sl.overrideAttrs {pname = "my-sl";};
+  };
+}

templates/system-flake/pkgs/hello-world/Makefile

@@ -0,0 +1,6 @@
+CFLAGS += -O3 -s
+
+all: hello-world
+
+%: %.c
+	$(CC) $(CFLAGS) -o $@ $<

templates/system-flake/pkgs/hello-world/default.nix

@@ -0,0 +1,14 @@
+{stdenv, ...}:
+stdenv.mkDerivation {
+  name = "hello-world";
+  version = "1.0.0";
+
+  src = ./.;
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp hello-world $out/bin
+  '';
+
+  meta.mainProgram = "hello-world";
+}

templates/system-flake/pkgs/hello-world/hello-world.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main()
+{
+	printf("Hello, world!\n");
+	return 0;
+}

templates/system-flake/pkgs/lib/default.nix

@@ -0,0 +1,3 @@
+{callPackage}: {
+  fibonacci = callPackage ./fibonacci.nix {};
+}

templates/system-flake/pkgs/lib/fibonacci.nix

@@ -0,0 +1,7 @@
+let
+  fib = n:
+    if n > 1
+    then fib (n - 1) + fib (n - 2)
+    else 1;
+in
+  fib

templates/system-flake/sys/default.nix

@@ -0,0 +1,14 @@
+{pkgs, ...}: {
+  # Let 'nixos-version --json' know about the Git revision
+  # of this flake.
+  system.configurationRevision = nixpkgs.lib.mkIf (self ? rev) self.rev;
+
+  # Network configuration.
+  networking.firewall.allowedTCPPorts = [80];
+
+  # Enable a web server.
+  services.httpd = {
+    enable = true;
+    adminAddr = "morty@example.org";
+  };
+}

templates/system-flake/sys/platform/foo/default.nix

@@ -0,0 +1,6 @@
+{pkgs, ...}: {
+  boot.isContainer = true;
+
+  # Network configuration.
+  networking.useDHCP = false;
+}