feat: add option to enable zsh via nix-machine configuration (#1)

.github/workflows/ci.yaml

@@ -29,12 +29,14 @@ jobs:
           cd ${{ matrix.template }}
 
           # Substitute in the build runner's configuration.
+          nix run nixpkgs#sd 'nix-machine.url = "github:squirmy/nix-machine"' 'nix-machine.url = "github:squirmy/nix-machine/${{ github.sha }}"' flake.nix
           nix run nixpkgs#sd 'username = "username"' 'username = "runner"' flake.nix
           nix run nixpkgs#sd 'homeDirectory = "/Users/username"' 'homeDirectory = "/Users/runner"' flake.nix
           nix run nixpkgs#sd 'nixpkgs.hostPlatform = "aarch64-darwin"' 'nixpkgs.hostPlatform = "x86_64-darwin"' flake.nix
 
           sudo -i mv /etc/nix/nix.conf /etc/nix/nix.conf.before-nix-darwin
-
+          sudo -i mv /etc/shells /etc/shells.before-nix-darwin
+          
           nix run nix-darwin --extra-experimental-features "nix-command flakes" -- switch --flake .#hostname
 
           source /etc/zshenv

configuration/home-manager/default.nix

@@ -3,7 +3,7 @@
   config,
   ...
 }: {
-  imports = [./trampoline];
+  imports = [./trampoline ./zsh.nix];
 
   # It is occasionally necessary for Home Manager to change configuration
   # defaults in a way that is incompatible with stateful data.

configuration/home-manager/zsh.nix

@@ -0,0 +1,8 @@
+{
+  lib,
+  config,
+  ...
+}:
+lib.mkIf config.nix-machine.shells.zsh.enable {
+  programs.zsh.enable = true;
+}

configuration/nix-darwin/default.nix

@@ -1,10 +1,16 @@
-{config, ...}: {
-  imports = [./nix.nix ./nixpkgs.nix];
+{
+  config,
+  pkgs,
+  ...
+}: {
+  imports = [./nix.nix ./nixpkgs.nix ./zsh.nix];
 
   # Set the user's name & home directory. This should be
   # in sync with home manager.
   users.users.${config.nix-machine.username} = {
     name = config.nix-machine.username;
     home = config.nix-machine.homeDirectory;
   };
+
+  environment.shells = [pkgs.bashInteractive];
 }

configuration/nix-darwin/zsh.nix

@@ -0,0 +1,10 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
+lib.mkIf config.nix-machine.shells.zsh.enable {
+  programs.zsh.enable = true;
+  environment.shells = [pkgs.zsh];
+}

configuration/options.nix

@@ -1,4 +1,8 @@
 {lib, ...}: let
+  shellsOptions = {
+    zsh.enable = lib.options.mkEnableOption "zsh";
+  };
+
   configurationOptions = {
     nixpkgs.hostPlatform = lib.mkOption {
       type = lib.types.str;
@@ -22,6 +26,10 @@
     homeDirectory = lib.mkOption {
       type = lib.types.str;
     };
+    shells = lib.mkOption {
+      type = lib.types.submodule {options = shellsOptions;};
+      default = {};
+    };
   };
 in {
   options.nix-machine = lib.mkOption {

templates/minimal/flake.nix

@@ -19,6 +19,7 @@
           username = "username";
           homeDirectory = "/Users/username";
           nixpkgs.hostPlatform = "aarch64-darwin";
+          shells.zsh.enable = true;
         };
       };
 
@@ -27,8 +28,6 @@
         # https://daiderd.com/nix-darwin/manual/index.html
         nixDarwin = {...}: {
           security.pam.enableSudoTouchIdAuth = true;
-
-          programs.zsh.enable = true;
         };
 
         # configuration to apply to home-manager
@@ -37,8 +36,6 @@
           home.packages = [
             pkgs.fortune
           ];
-
-          programs.zsh.enable = true;
         };
       };
     };