nixos/tests/ncps: init service test

nixos/tests/all-tests.nix

@@ -659,6 +659,11 @@ in {
   navidrome = handleTest ./navidrome.nix {};
   nbd = handleTest ./nbd.nix {};
   ncdns = handleTest ./ncdns.nix {};
+  ncps = runTest ./ncps.nix;
+  ncps-custom-cache-datapath = runTest {
+    imports = [ ./ncps.nix ];
+    defaults.services.ncps.cache.dataPath =  "/path/to/ncps";
+  };
   ndppd = handleTest ./ndppd.nix {};
   nix-channel = pkgs.callPackage ../modules/config/nix-channel/test.nix { };
   nebula = handleTest ./nebula.nix {};

nixos/tests/ncps.nix

@@ -0,0 +1,89 @@
+{
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  name = "ncps";
+
+  nodes = {
+    harmonia = {
+      services.harmonia = {
+        enable = true;
+        signKeyPaths = [
+          (pkgs.writeText "cache-key" "cache.example.com-1:9FhO0w+7HjZrhvmzT1VlAZw4OSAlFGTgC24Seg3tmPl4gZBdwZClzTTHr9cVzJpwsRSYLTu7hEAQe3ljy92CWg==")
+        ];
+        settings.priority = 35;
+      };
+
+      networking.firewall.allowedTCPPorts = [ 5000 ];
+      system.extraDependencies = [ pkgs.emptyFile ];
+    };
+
+    ncps = {
+      services.ncps = {
+        enable = true;
+
+        cache = {
+          hostName = "ncps";
+          secretKeyPath = builtins.toString (
+            pkgs.writeText "ncps-cache-key" "ncps:dcrGsrku0KvltFhrR5lVIMqyloAdo0y8vYZOeIFUSLJS2IToL7dPHSSCk/fi+PJf8EorpBn8PU7MNhfvZoI8mA=="
+          );
+        };
+
+        upstream = {
+          caches = [ "http://harmonia:5000" ];
+          publicKeys = [
+            "cache.example.com-1:eIGQXcGQpc00x6/XFcyacLEUmC07u4RAEHt5Y8vdglo="
+          ];
+        };
+      };
+
+      networking.firewall.allowedTCPPorts = [ 8501 ];
+    };
+
+    client01 = {
+      nix.settings = {
+        substituters = lib.mkForce [ "http://ncps:8501" ];
+        trusted-public-keys = lib.mkForce [
+          "ncps:UtiE6C+3Tx0kgpP34vjyX/BKK6QZ/D1OzDYX72aCPJg="
+        ];
+      };
+    };
+  };
+
+  testScript =
+    { nodes, ... }:
+    let
+      narinfoName =
+        (lib.strings.removePrefix "/nix/store/" (
+          lib.strings.removeSuffix "-empty-file" pkgs.emptyFile.outPath
+        ))
+        + ".narinfo";
+
+      narinfoNameChars = lib.strings.stringToCharacters narinfoName;
+
+      narinfoPath = lib.concatStringsSep "/" [
+        nodes.ncps.services.ncps.cache.dataPath
+        "store/narinfo"
+        (lib.lists.elemAt narinfoNameChars 0)
+        ((lib.lists.elemAt narinfoNameChars 0) + (lib.lists.elemAt narinfoNameChars 1))
+        narinfoName
+      ];
+    in
+    ''
+      start_all()
+
+      harmonia.wait_for_unit("harmonia.service")
+
+      ncps.wait_for_unit("ncps.service")
+
+      client01.wait_until_succeeds("curl -f http://ncps:8501/ | grep '\"hostname\":\"${toString nodes.ncps.services.ncps.cache.hostName}\"' >&2")
+
+      client01.succeed("cat /etc/nix/nix.conf >&2")
+      client01.succeed("nix-store --realise ${pkgs.emptyFile}")
+
+      ncps.succeed("cat ${narinfoPath} >&2")
+    '';
+}