feat(ops/gerrit-tvl): init TVL Gerrit plugin r/2452

This is just going to be a grab bag of things which do TVL-specific
things to Gerrit, whether that be exposing new Prolog predicates or, as
I intend to do as the first thing, expose Buildkite builds as checks.

Change-Id: Iaeab987a1fdbd078b85e274691c986489903bf3a
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2872
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>

6 files changed, 59 insertions, 1 deletions

diff --git a/ops/gerrit-tvl/HttpModule.java b/ops/gerrit-tvl/HttpModule.java
new file mode 100644
index 000000000000..6d785c0817fc
--- /dev/null
+++ b/ops/gerrit-tvl/HttpModule.java
@@ -0,0 +1,14 @@
+package su.tvl.gerrit;
+
+import com.google.gerrit.extensions.registration.DynamicSet;
+import com.google.gerrit.extensions.webui.JavaScriptPlugin;
+import com.google.gerrit.extensions.webui.WebUiPlugin;
+import com.google.inject.servlet.ServletModule;
+
+public final class HttpModule extends ServletModule {
+
+  @Override
+  protected void configureServlets() {
+    DynamicSet.bind(binder(), WebUiPlugin.class).toInstance(new JavaScriptPlugin("tvl.js"));
+  }
+}
diff --git a/ops/gerrit-tvl/MANIFEST.MF b/ops/gerrit-tvl/MANIFEST.MF
new file mode 100644
index 000000000000..bfe4eedeb6ac
--- /dev/null
+++ b/ops/gerrit-tvl/MANIFEST.MF
@@ -0,0 +1,2 @@
+Gerrit-HttpModule: su.tvl.gerrit.HttpModule
+Gerrit-PluginName: tvl
diff --git a/ops/gerrit-tvl/README.md b/ops/gerrit-tvl/README.md
new file mode 100644
index 000000000000..1b88600f197f
--- /dev/null
+++ b/ops/gerrit-tvl/README.md
@@ -0,0 +1,6 @@
+# gerrit-tvl
+
+A Gerrit plugin that does TVL-specific things.
+
+You probably want to take inspiration from this rather than using it directly,
+as it has a variety of TVL-ish assumptions baked into it.
diff --git a/ops/gerrit-tvl/default.nix b/ops/gerrit-tvl/default.nix
new file mode 100644
index 000000000000..f3bec7a3a242
--- /dev/null
+++ b/ops/gerrit-tvl/default.nix
@@ -0,0 +1,33 @@
+{ depot, pkgs, lib, ... }:
+
+let
+  classPath = lib.concatStringsSep ":" [
+    "${depot.third_party.gerrit}/share/api/extension-api_deploy.jar"
+  ];
+in
+pkgs.stdenvNoCC.mkDerivation rec {
+  name = "${pname}-${version}.jar";
+  pname = "gerrit-tvl";
+  version = "0.0.1";
+
+  src = ./.;
+
+  nativeBuildInputs = with pkgs; [
+    jdk
+  ];
+
+  buildPhase = ''
+    mkdir $NIX_BUILD_TOP/build
+
+    # Build Java components.
+    export JAVAC="javac -cp ${classPath} -d $NIX_BUILD_TOP/build --release 11"
+    $JAVAC ./HttpModule.java
+
+    # Install static files.
+    cp -R static $NIX_BUILD_TOP/build/static
+  '';
+
+  installPhase = ''
+    jar --create --file $out --manifest $src/MANIFEST.MF -C $NIX_BUILD_TOP/build .
+  '';
+}
diff --git a/ops/gerrit-tvl/static/tvl.js b/ops/gerrit-tvl/static/tvl.js
new file mode 100644
index 000000000000..f6c1c732a4d3
--- /dev/null
+++ b/ops/gerrit-tvl/static/tvl.js
@@ -0,0 +1,3 @@
+Gerrit.install(plugin => {
+  console.log('TVL plugin initialising');
+});
diff --git a/ops/nixos/monorepo-gerrit.nix b/ops/nixos/monorepo-gerrit.nix
index 1c8564e03251..61d8b71a5baa 100644
--- a/ops/nixos/monorepo-gerrit.nix
+++ b/ops/nixos/monorepo-gerrit.nix
@@ -18,9 +18,9 @@ in {
     ];
 
     plugins = with depot.third_party.gerrit_plugins; [
-      checks
       owners
       oauth
+      depot.ops.gerrit-tvl
     ];
 
     package = depot.third_party.gerrit;