[MNG-6725] Skip '.mavenrc' via MAVEN_SKIP_RC=1 and '-Dmaven.skip.rc=true' on child ITs (by default on Jenkins CI).

its/core-it-suite/pom.xml

@@ -193,6 +193,10 @@ under the License.
               <name>maven.it.global-settings.dir</name>
               <value>${project.build.testOutputDirectory}</value>
             </property>
+            <property>
+              <name>maven.skip.rc</name>
+              <value>${maven.skip.rc}</value>
+            </property>
           </systemProperties>
         </configuration>
       </plugin>

its/core-it-support/maven-it-helper/src/main/java/org/apache/maven/it/AbstractMavenIntegrationTestCase.java

@@ -42,6 +42,11 @@ import java.util.regex.Pattern;
 public abstract class AbstractMavenIntegrationTestCase
     extends TestCase
 {
+    /**
+     * Skips using ".mavenrc" on the system. For more information, see 'MAVEN_SKIP_RC' in $MAVEN_DIST/bin/mvn.
+     */
+    private static final boolean MAVEN_SKIP_RC = isMavenSkipRc();
+
     /**
      * Save System.out for progress reports etc.
      */
@@ -495,6 +500,11 @@ public abstract class AbstractMavenIntegrationTestCase
     {
         Verifier verifier = new Verifier( basedir, debug );
 
+        if ( MAVEN_SKIP_RC )
+        {
+            verifier.setEnvironmentVariable( "MAVEN_SKIP_RC", "1" );
+        }
+
         verifier.setAutoclean( false );
 
         if ( settings != null )
@@ -601,4 +611,21 @@ public abstract class AbstractMavenIntegrationTestCase
     {
         assertCanonicalFileEquals( null, new File( expected ), new File( actual ) );
     }
+
+    private static boolean isMavenSkipRc()
+    {
+        boolean skipRc = Boolean.getBoolean( "maven.skip.rc" );
+
+        if ( skipRc )
+        {
+            System.out.println( "SKIPPED - Skipped '.mavenrc'!" );
+        }
+        else
+        {
+            System.out.println( "In order to disable '.mavenrc' set the system property 'maven.skip.rc', i.e. "
+                    + "'mvn -Dmaven.skip.rc=true -P run-its verify'." );
+        }
+
+        return skipRc;
+    }
 }