build: add clirr check (#380)

* build: add clirr check

* build: fix checkstyle source directories

.kokoro/build.sh

@@ -21,7 +21,10 @@ cd github/google-auth-library-java/
 java -version
 echo $JOB_TYPE
 
-mvn install -DskipTests=true -Dmaven.javadoc.skip=true -B -V
+mvn install -B -V \
+  -DskipTests=true \
+  -Dclirr.skip \
+  -Dmaven.javadoc.skip=true
 
 case ${JOB_TYPE} in
 test)
@@ -37,6 +40,9 @@ javadoc)
 integration)
     mvn -B -pl ${INTEGRATION_TEST_ARGS} -DtrimStackTrace=false -fae verify
     ;;
+clirr)
+    mvn -B clirr:check
+    ;;
 *)
     ;;
 esac

.kokoro/dependencies.sh

@@ -23,5 +23,7 @@ echo $JOB_TYPE
 
 export MAVEN_OPTS="-Xmx1024m -XX:MaxPermSize=128m"
 
-mvn install -DskipTests=true -B -V
+mvn install -B -V \
+  -Dclirr.skip=true \
+  -DskipTests=true
 mvn -B dependency:analyze -DfailOnWarning=true

.kokoro/presubmit/clirr.cfg

@@ -0,0 +1,13 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Configure the docker image for kokoro-trampoline.
+
+env_vars: {
+  key: "TRAMPOLINE_IMAGE"
+  value: "gcr.io/cloud-devrel-kokoro-resources/java8"
+}
+
+env_vars: {
+  key: "JOB_TYPE"
+  value: "clirr"
+}

pom.xml

@@ -208,6 +208,11 @@
             <verbose>true</verbose>
           </configuration>
         </plugin>
+        <plugin>
+          <groupId>org.codehaus.mojo</groupId>
+          <artifactId>clirr-maven-plugin</artifactId>
+          <version>2.8</version>
+        </plugin>
       </plugins>
     </pluginManagement>
     <plugins>
@@ -255,6 +260,13 @@
               <violationSeverity>error</violationSeverity>
               <failsOnError>true</failsOnError>
               <includeTestSourceDirectory>true</includeTestSourceDirectory>
+              <!-- Explicitly set the source directory to avoid running checkstyle on generated sources. -->
+              <sourceDirectories>
+                <sourceDirectory>src/main</sourceDirectory>
+              </sourceDirectories>
+              <testSourceDirectories>
+                <testSourceDirectory>src/test</testSourceDirectory>
+              </testSourceDirectories>
             </configuration>
           </execution>
         </executions>
@@ -286,6 +298,21 @@
           </execution>
         </executions>
       </plugin>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>clirr-maven-plugin</artifactId>
+        <configuration>
+          <ignoredDifferencesFile>clirr-ignored-differences.xml</ignoredDifferencesFile>
+          <logResults>true</logResults>
+        </configuration>
+        <executions>
+          <execution>
+            <goals>
+              <goal>check</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
     </plugins>
   </build>