nix builder

hosts/nix-builder/harmonia.nix

@@ -0,0 +1,37 @@
+_:
+
+{
+  sops.secrets.nix-cache-signing-key = {
+    mode = "0400";
+  };
+
+  nix.settings = {
+    build-dir = "/var/lib/nix-build";
+
+    secret-key-files = [
+      "/var/lib/secrets/nix-cache-signing-key"
+    ];
+
+    auto-optimise-store = false;
+    keep-outputs = false;
+    keep-derivations = true;
+  };
+
+  services.harmonia.cache = {
+    enable = true;
+
+    signKeyPaths = [
+      "/var/lib/secrets/nix-cache-signing-key"
+    ];
+
+    settings = {
+      bind = "[::]:5000";
+      priority = 30;
+      workers = 4;
+    };
+  };
+
+  networking.firewall.allowedTCPPorts = [
+    5000
+  ];
+}

modules/profiles/workload/deploy-rs-target/meta.nix

@@ -0,0 +1,8 @@
+{
+  description = "NixOS deploy-rs deployment target";
+
+  includes = [
+    "services.openssh"
+    "users.nixdeploy"
+  ];
+}

modules/users/nixdeploy/nixos.nix

@@ -0,0 +1,28 @@
+{ pkgs, ... }:
+{
+  users.groups.nixdeploy = { };
+
+  users.users.nixdeploy = {
+    isSystemUser = true;
+    group = "nixdeploy";
+    home = "/var/lib/nixdeploy";
+    createHome = true;
+    shell = pkgs.bashInteractive;
+    openssh.authorizedKeys.keys = [
+      "restrict ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFPg1aw0qXBmrQe6lzBwutX5t9Sxg2OeVN/homjqU6Ja moons@nix-builder"
+    ];
+  };
+
+  security.sudo.extraRules = [
+    {
+      users = [ "nixdeploy" ];
+
+      commands = [
+        {
+          command = "ALL";
+          options = [ "NOPASSWD" ];
+        }
+      ];
+    }
+  ];
+}