modules/community-builder: add nixpkgs clone

Co-authored-by: nicoo <nicoo@mur.at>
nix-community · Sep 20, 2024 · 3392681 · 3392681
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diff --git a/docs/community-builder.md b/docs/community-builder.md
@@ -44,6 +44,12 @@ IF YOU ARE: making binary bootstrap tools, please only use tools built on a syst
 
 _This section is based on the notes ([1](https://github.com/NixOS/aarch64-build-box), [2](https://github.com/nix-community/darwin-build-box)) written by [@grahamc](https://github.com/grahamc) and [@winterqt](https://github.com/winterqt)._
 
+### Nixpkgs clone
+
+```console
+$ git clone --reference /var/lib/nixpkgs.git https://github.com/NixOS/nixpkgs.git
+```
+
 ### Using your NixOS home-manager configuration on the hosts
 
 If you happen to have your NixOS & home-manager configurations intertwined but you'd like your familiar environment on our infrastructure you can evaluate `pkgs.writeShellScript "hm-activate" config.systemd.services.home-manager-<yourusername>.serviceConfig.ExecStart` from your NixOS configuration, and send this derivation to be realized remotely: (in case you aren't a Nix trusted user)

diff --git a/modules/darwin/community-builder/default.nix b/modules/darwin/community-builder/default.nix
@@ -9,4 +9,14 @@
   environment.systemPackages = [
     pkgs.vim
   ];
+
+  launchd.daemons.nixpkgs-clone = {
+    serviceConfig = {
+      StartCalendarInterval = [ { Minute = 0; } ];
+    };
+    path = [
+      pkgs.git
+    ];
+    script = builtins.readFile "${inputs.self}/modules/shared/nixpkgs-clone.bash";
+  };
 }
diff --git a/modules/nixos/community-builder/default.nix b/modules/nixos/community-builder/default.nix
@@ -22,4 +22,13 @@
   programs.fish.enable = true;
   # disable generated completion
   environment.etc."fish/generated_completions".text = pkgs.lib.mkForce "";
+
+  systemd.services.nixpkgs-clone = {
+    serviceConfig.Type = "oneshot";
+    startAt = "hourly";
+    path = [
+      pkgs.git
+    ];
+    script = builtins.readFile "${inputs.self}/modules/shared/nixpkgs-clone.bash";
+  };
 }
diff --git a/modules/shared/nixpkgs-clone.bash b/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/*" fetch