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/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)
+      )
+    '';
+  }
+)