chore: add VM test

libfakecache is not needed anymore. we're using NixOS VM tests to test
the functionality of the cache.

Author: zimbatm

README.md

@@ -47,6 +47,15 @@ In your NixOS configuration:
 }
 ```
 
+TLS/ACME (when `forceSSL = true`, the default):
+
+```
+security.acme = {
+  acceptTerms = true;
+  defaults.email = "[email protected]";
+};
+```
+
 ## Point Clients At It
 
 NixOS:
@@ -134,3 +143,7 @@ extra-substituters = https://hetzner-cache.numtide.com
 ## Support
 
 Maintained by Numtide. Issues and contributions welcome.
+
+## License
+
+MIT — see `LICENSE`.

checks/nixos-smoke.nix

@@ -0,0 +1,52 @@
+{ pkgs, ... }:
+let
+  module = import ../modules/nixos/nixos-passthru-cache;
+in
+pkgs.nixosTest {
+  name = "nixos-passthru-cache-smoke";
+
+  nodes.machine = { pkgs, ... }: {
+    imports = [ module ];
+
+    # Fake upstream served by the same nginx on 127.0.0.1:1234
+    services.nginx.virtualHosts."fake-upstream" = {
+      listen = [{ addr = "127.0.0.1"; port = 1234; ssl = false; }];
+      serverName = "fake-upstream";
+      locations."/".extraConfig = ''
+        add_header Cache-Control "max-age=3600";
+        add_header X-Fake-Upstream 1;
+        return 200 "hello from upstream\n";
+      '';
+    };
+
+    services.nixos-passthru-cache = {
+      enable = true;
+      forceSSL = false;
+      hostName = "cache.local";
+      upstream = "http://127.0.0.1:1234";
+      stats.enable = true;
+    };
+
+    # Keep things simple for the test
+    networking.firewall.enable = false;
+    environment.systemPackages = [ pkgs.curl ];
+  };
+
+  testScript = ''
+    start_all()
+    machine.wait_for_unit("nginx.service")
+    machine.wait_for_open_port(80)
+    machine.wait_for_open_port(1234)
+
+    # nix-cache-info served with correct content-type and content
+    machine.succeed("curl -sSfI http://localhost/nix-cache-info | grep -qi 'content-type: text/x-nix-cache-info'")
+    machine.succeed("curl -sSf http://localhost/nix-cache-info | grep -q '^StoreDir:'")
+
+    # Cache MISS then HIT against fake upstream
+    machine.succeed("curl -sSfi http://localhost/foo | tee /tmp/res1 | grep -qi '^X-Cache-Status: MISS' || (echo 'expected MISS' && cat /tmp/res1 && false)")
+    machine.succeed("curl -sSfi http://localhost/foo | tee /tmp/res2 | grep -qi '^X-Cache-Status: HIT' || (echo 'expected HIT' && cat /tmp/res2 && false)")
+
+    # VTS status page reachable (HTML)
+    machine.succeed("curl -sSfI http://localhost/status | grep -q '200'")
+  '';
+}

flake.lock

@@ -1,5 +1,5 @@
 {
-  description = "my flake";
+  description = "nixos-passthru-cache - Pull-through cache for Nix";
 
   # Add all your dependencies here
   inputs = {