modules/community-builder: add nixpkgs clone

modules/darwin/community-builder/default.nix

@@ -1,12 +1,39 @@
-{ inputs, pkgs, ... }:
+{
+  config,
+  inputs,
+  pkgs,
+  ...
+}:
 {
   imports = [
     "${inputs.self}/modules/shared/community-builder.nix"
     inputs.nix-index-database.darwinModules.nix-index
     ./users.nix
   ];
 
+  environment.etc.motd.text = config.nixCommunity.motd;
+
   environment.systemPackages = [
     pkgs.vim
   ];
+
+  launchd.daemons.nixpkgs-clone = {
+    environment = {
+      inherit (config.environment.variables) NIX_SSL_CERT_FILE;
+    };
+    serviceConfig = {
+      StartCalendarInterval = [
+        {
+          Hour = 0;
+          Minute = 0;
+        }
+      ];
+      StandardErrorPath = "/var/log/nixpkgs-clone.log";
+      StandardOutPath = "/var/log/nixpkgs-clone.log";
+    };
+    path = [
+      pkgs.git
+    ];
+    script = builtins.readFile "${inputs.self}/modules/shared/nixpkgs-clone.bash";
+  };
 }

modules/nixos/community-builder/default.nix

@@ -1,11 +1,18 @@
-{ inputs, pkgs, ... }:
+{
+  config,
+  inputs,
+  pkgs,
+  ...
+}:
 {
   imports = [
     "${inputs.self}/modules/shared/community-builder.nix"
     inputs.nix-index-database.nixosModules.nix-index
     ./users.nix
   ];
 
+  users.motd = config.nixCommunity.motd;
+
   environment.systemPackages = [
     # terminfo packages
     pkgs.foot.terminfo
@@ -22,4 +29,13 @@
   programs.fish.enable = true;
   # disable generated completion
   environment.etc."fish/generated_completions".text = pkgs.lib.mkForce "";
+
+  systemd.services.nixpkgs-clone = {
+    serviceConfig.Type = "oneshot";
+    startAt = "daily";
+    path = [
+      pkgs.git
+    ];
+    script = builtins.readFile "${inputs.self}/modules/shared/nixpkgs-clone.bash";
+  };
 }

modules/shared/community-builder.nix

@@ -1,26 +1,43 @@
-{ pkgs, ... }:
+{ lib, pkgs, ... }:
 {
-  # useful for people that want to test stuff
-  environment.systemPackages = [
-    pkgs.fd
-    pkgs.git
-    pkgs.nano
-    pkgs.nix-output-monitor
-    pkgs.nix-tree
-    pkgs.nixpkgs-review
-    pkgs.ripgrep
-    pkgs.tig
-  ];
-
-  programs.nix-index-database.comma.enable = true;
-
-  programs.zsh = {
-    enable = true;
-    # https://grml.org/zsh/grmlzshrc.html
-    # https://grml.org/zsh/grml-zsh-refcard.pdf
-    interactiveShellInit = ''
-      source ${pkgs.grml-zsh-config}/etc/zsh/zshrc
+  options.nixCommunity.motd = lib.mkOption {
+    type = lib.types.str;
+    description = "message of the day";
+  };
+
+  config = {
+    nixCommunity.motd = ''
+
+      Welcome to Nix Community!
+
+      For a faster Nixpkgs clone use:
+
+      git clone --reference /var/lib/nixpkgs.git https://github.com/NixOS/nixpkgs.git
+
     '';
-    promptInit = ""; # otherwise it'll override the grml prompt
+
+    # useful for people that want to test stuff
+    environment.systemPackages = [
+      pkgs.fd
+      pkgs.git
+      pkgs.nano
+      pkgs.nix-output-monitor
+      pkgs.nix-tree
+      pkgs.nixpkgs-review
+      pkgs.ripgrep
+      pkgs.tig
+    ];
+
+    programs.nix-index-database.comma.enable = true;
+
+    programs.zsh = {
+      enable = true;
+      # https://grml.org/zsh/grmlzshrc.html
+      # https://grml.org/zsh/grml-zsh-refcard.pdf
+      interactiveShellInit = ''
+        source ${pkgs.grml-zsh-config}/etc/zsh/zshrc
+      '';
+      promptInit = ""; # otherwise it'll override the grml prompt
+    };
   };
 }

modules/shared/nixpkgs-clone.bash

@@ -0,0 +1,5 @@
+CLONE_DIR="/var/lib/nixpkgs.git"
+if [ ! -d "$CLONE_DIR" ]; then
+  git clone --bare https://github.com/NixOS/nixpkgs.git "$CLONE_DIR"
+fi
+git -C "$CLONE_DIR" -c remote.origin.fetch="+refs/heads/*:refs/remotes/origin/*" -c fetch.prune=true fetch