Add an equivalent of validate-source-patterns task, delegating to the same groovy script.

build.gradle

@@ -39,6 +39,7 @@ apply from: file('gradle/validation/forbidden-apis.gradle')
 apply from: file('gradle/validation/jar-checks.gradle')
 apply from: file('gradle/validation/git-status.gradle')
 apply from: file('gradle/validation/versions-props-sorted.gradle')
+apply from: file('gradle/validation/validate-source-patterns.gradle')
 
 // Additional development aids.
 apply from: file('gradle/maven/maven-local.gradle')

gradle/validation/precommit.gradle

@@ -9,6 +9,7 @@ configure(rootProject) {
     dependsOn verifyLocks
     dependsOn ":versionsPropsAreSorted"
     dependsOn ":checkWorkingCopyPristine"
+    dependsOn ":validateSourcePatterns"
 
     // Attach tasks from other projects using lazy collection
     // as they may not yet be defined.

gradle/validation/validate-source-patterns.gradle

@@ -0,0 +1,25 @@
+
+// Equivalent of ant's "validate-source-patterns".
+// This should be eventually rewritten in plain gradle. For now, delegate to
+// the ant/groovy script we already have.
+
+configurations {
+  checkSourceDeps
+}
+
+dependencies {
+  checkSourceDeps "org.codehaus.groovy:groovy-all:2.4.17"
+  checkSourceDeps "org.apache.rat:apache-rat:0.11"
+}
+
+configure(rootProject) {
+  task validateSourcePatterns() {
+    doFirst {
+      ant.taskdef(
+          resource: 'org/codehaus/groovy/antlib.xml',
+          classpath: configurations.checkSourceDeps.asPath)
+
+      ant.groovy(src: project(":lucene").file("tools/src/groovy/check-source-patterns.groovy"))
+    }
+  }
+}