nar-serve: init at 0.3.0 (#95420)

* nar-serve: init at 0.3.0

* nixos/nar-serve: add new module

Co-authored-by: zimbatm <zimbatm@zimbatm.com>

nixos/modules/module-list.nix

@@ -680,6 +680,7 @@
   ./services/networking/murmur.nix
   ./services/networking/mxisd.nix
   ./services/networking/namecoind.nix
+  ./services/networking/nar-serve.nix
   ./services/networking/nat.nix
   ./services/networking/ndppd.nix
   ./services/networking/networkmanager.nix

nixos/modules/services/networking/nar-serve.nix

@@ -0,0 +1,55 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+let
+  cfg = config.services.nar-serve;
+in
+{
+  meta = {
+    maintainers = [ maintainers.rizary ];
+  };
+  options = {
+    services.nar-serve = {
+      enable = mkEnableOption "Serve NAR file contents via HTTP";
+
+      port = mkOption {
+        type = types.int;
+        default = 8383;
+        description = ''
+          Port number where nar-serve will listen on.
+        '';
+      };
+
+      cacheURL = mkOption {
+        type = types.str;
+        default = "https://cache.nixos.org/";
+        description = ''
+          Binary cache URL to connect to.
+
+          The URL format is compatible with the nix remote url style, such as:
+          - http://, https:// for binary caches via HTTP or HTTPS
+          - s3:// for binary caches stored in Amazon S3
+          - gs:// for binary caches stored in Google Cloud Storage
+        '';
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.services.nar-serve = {
+      description = "NAR server";
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+
+      environment.PORT = toString cfg.port;
+      environment.NAR_CACHE_URL = cfg.cacheURL;
+
+      serviceConfig = {
+        Restart = "always";
+        RestartSec = "5s";
+        ExecStart = "${pkgs.nar-serve}/bin/nar-serve";
+        DynamicUser = true;
+      };
+    };
+  };
+}

nixos/tests/all-tests.nix

@@ -225,6 +225,7 @@ in
   mysql-backup = handleTest ./mysql/mysql-backup.nix {};
   mysql-replication = handleTest ./mysql/mysql-replication.nix {};
   nagios = handleTest ./nagios.nix {};
+  nar-serve = handleTest ./nar-serve.nix {};
   nat.firewall = handleTest ./nat.nix { withFirewall = true; };
   nat.firewall-conntrack = handleTest ./nat.nix { withFirewall = true; withConntrackHelpers = true; };
   nat.standalone = handleTest ./nat.nix { withFirewall = false; };

nixos/tests/nar-serve.nix

@@ -0,0 +1,48 @@
+import ./make-test-python.nix (
+  { pkgs, lib, ... }:
+  {
+    name = "nar-serve";
+    meta.maintainers = [ lib.maintainers.rizary ];
+    nodes =
+      {
+        server = { pkgs, ... }: {
+          services.nginx = {
+            enable = true;
+            virtualHosts.default.root = "/var/www";
+          };
+          services.nar-serve = {
+            enable = true;
+            # Connect to the localhost nginx instead of the default
+            # https://cache.nixos.org
+            cacheURL = "http://localhost/";
+          };
+          environment.systemPackages = [
+            pkgs.hello
+            pkgs.curl
+          ];
+
+          networking.firewall.allowedTCPPorts = [ 8383 ];
+
+          # virtualisation.diskSize = 2 * 1024;
+        };
+      };
+    testScript = ''
+      start_all()
+
+      # Create a fake cache with Nginx service the static files
+      server.succeed(
+          "nix copy --to file:///var/www ${pkgs.hello}"
+      )
+      server.wait_for_unit("nginx.service")
+      server.wait_for_open_port(80)
+
+      # Check that nar-serve can return the content of the derivation
+      drvName = os.path.basename("${pkgs.hello}")
+      drvHash = drvName.split("-")[0]
+      server.wait_for_unit("nar-serve.service")
+      server.succeed(
+          "curl -o hello -f http://localhost:8383/nix/store/{}/bin/hello".format(drvHash)
+      )
+    '';
+  }
+)

pkgs/tools/nix/nar-serve/default.nix

@@ -0,0 +1,31 @@
+{ buildGoModule
+, fetchFromGitHub
+, lib
+, stdenv
+}:
+let
+  pname = "nar-serve";
+  version = "0.3.0";
+
+in
+buildGoModule rec {
+  inherit pname version;
+
+  src = fetchFromGitHub {
+    owner = "numtide";
+    repo = "nar-serve";
+    rev = "v${version}";
+    sha256 = "000xxrar5ngrqqfi7ynx84i6wi27mirgm26brhyg0y4pygc9ykhz";
+  };
+
+  vendorSha256 = "0qkzbr85wkx3r7qgnzg9pdl7vsli10bzcdbj2gqd1kdzwb8khszs";
+
+  doCheck = false;
+
+  meta = with stdenv.lib; {
+    description = "Serve NAR file contents via HTTP";
+    homepage = "https://github.com/numtide/nar-serve";
+    license = licenses.mit;
+    maintainers = with maintainers; [ rizary ];
+  };
+}

pkgs/top-level/all-packages.nix

@@ -27314,6 +27314,8 @@ in
 
   mynewt-newt = callPackage ../tools/package-management/mynewt-newt { };
 
+  nar-serve = callPackage ../tools/nix/nar-serve { };
+
   inherit (callPackage ../tools/package-management/nix {
       storeDir = config.nix.storeDir or "/nix/store";
       stateDir = config.nix.stateDir or "/nix/var";