Bug 1837478 - Refactor FenixDependencies into a plugin using composite build

build.gradle

@@ -83,7 +83,7 @@ buildscript {
     }
 
     // Variables in plugins {} aren't directly supported. Hack around it by setting an
-    // intermediate variable which can pull from FenixDependencies.kt and be used later.
+    // intermediate variable which can pull from FenixDependenciesPlugin.kt and be used later.
     ext {
         detekt_plugin = FenixVersions.detekt
         protobuf_plugin = FenixVersions.protobuf_plugin

plugins/fenixdependencies/build.gradle

@@ -0,0 +1,26 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+plugins {
+    id "org.gradle.kotlin.kotlin-dsl" version "2.4.1"
+}
+
+repositories {
+    if (project.hasProperty("centralRepo")) {
+        maven {
+            name "MavenCentral"
+            url project.property("centralRepo")
+            allowInsecureProtocol true // Local Nexus in CI uses HTTP
+        }
+    } else {
+        mavenCentral()
+    }
+}
+
+gradlePlugin {
+    plugins.register("FenixDependenciesPlugin") {
+        id = "FenixDependenciesPlugin"
+        implementationClass = "FenixDependenciesPlugin"
+    }
+}

plugins/fenixdependencies/settings.gradle

@@ -0,0 +1,5 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// Prevents gradle builds from looking for a root settings.gradle

plugins/fenixdependencies/src/main/java/FenixDependenciesPlugin.kt

@@ -2,9 +2,16 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+import org.gradle.api.Plugin
+import org.gradle.api.initialization.Settings
+
 // If you ever need to force a toolchain rebuild (taskcluster) then edit the following comment.
 // FORCE REBUILD 2023-05-12
 
+class FenixDependenciesPlugin : Plugin<Settings> {
+    override fun apply(settings: Settings) = Unit
+}
+
 object FenixVersions {
     const val kotlin = "1.8.21"
     const val coroutines = "1.6.4"

settings.gradle

@@ -5,9 +5,11 @@
 pluginManagement {
     includeBuild("../android-components/plugins/publicsuffixlist")
     includeBuild("../android-components/plugins/dependencies")
+    includeBuild("./plugins/fenixdependencies")
 }
 
 plugins {
+    id 'FenixDependenciesPlugin'
     id 'mozac.DependenciesPlugin'
 }