LUCENE-9232: add a script-hack check so that in case somebody upgrades the scripts automatically they'll know they need to add the hack.

build.gradle

@@ -87,6 +87,7 @@ apply from: file('gradle/validation/config-file-sanity.gradle')
 apply from: file('gradle/validation/rat-sources.gradle')
 apply from: file('gradle/validation/owasp-dependency-check.gradle')
 apply from: file('gradle/validation/ecj-lint.gradle')
+apply from: file('gradle/validation/gradlew-scripts-tweaked.gradle')
 
 // Source or data regeneration tasks
 apply from: file('gradle/generation/jflex.gradle')

gradle/validation/gradlew-scripts-tweaked.gradle

@@ -0,0 +1,44 @@
+import java.nio.charset.StandardCharsets
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// This ensures 'gradlew*' scripts contain the manual fix so that they
+// don't fork a daemon subprocess on the initial run.
+
+configure(rootProject) {
+  task gradlewScriptsTweaked() {
+    def scripts = [
+        file("gradlew"),
+        file("gradlew.bat")
+    ]
+
+    inputs.files(scripts)
+    outputs.upToDateWhen { true }
+
+    doFirst {
+      scripts.each { file ->
+        def content = new String(file.readBytes(), StandardCharsets.US_ASCII)
+        if (content.indexOf("Don't fork a daemon mode on initial run that generates local defaults") < 0) {
+          throw new GradleException("Launch script ${file} does not have a manual daemon tweak (see LUCENE-9232).")
+        }
+      }
+    }
+  }
+
+  check.dependsOn gradlewScriptsTweaked
+}