rat check make target (apache#15127)

Makefile

@@ -677,6 +677,26 @@ rclean:
 	$(RM) -r R-package/src/image_recordio.h R-package/NAMESPACE R-package/man R-package/R/mxnet_generated.R \
 		R-package/inst R-package/src/*.o R-package/src/*.so mxnet_*.tar.gz
 
+build/rat/apache-rat/target/apache-rat-0.13-SNAPSHOT.jar:
+	mkdir -p build
+	svn co http://svn.apache.org/repos/asf/creadur/rat/branches/0.12-release/ build/rat; \
+	cd build/rat; \
+	mvn -Dmaven.test.skip=true install;
+
+ratcheck: build/rat/apache-rat/target/apache-rat-0.13-SNAPSHOT.jar
+	exec 5>&1; \
+	RAT_JAR=build/rat/apache-rat/target/apache-rat-0.13-SNAPSHOT.jar; \
+	OUTPUT=$(java -jar $(RAT_JAR) -E tests/nightly/apache_rat_license_check/rat-excludes -d .|tee >(cat - >&5)); \
+    ERROR_MESSAGE="Printing headers for text files without a valid license header"; \
+    echo "-------Process The Output-------"; \
+    if [[ $OUTPUT =~ $ERROR_MESSAGE ]]; then \
+        echo "ERROR: RAT Check detected files with unknown licenses. Please fix and run test again!"; \
+        exit 1; \
+    else \
+        echo "SUCCESS: There are no files with an Unknown License."; \
+    fi
+
+
 ifneq ($(EXTRA_OPERATORS),)
 clean: rclean cyclean $(EXTRA_PACKAGES_CLEAN)
 	$(RM) -r build lib bin deps *~ */*~ */*/*~ */*/*/*~