[MDEP-425] Add list-plugin-repositories goal
diff --git a/src/it/projects/list-plugin-repositories/invoker.properties b/src/it/projects/list-plugin-repositories/invoker.properties
new file mode 100644
index 0000000..f88ba5b
--- /dev/null
+++ b/src/it/projects/list-plugin-repositories/invoker.properties
@@ -0,0 +1,18 @@
+# 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.
+
+invoker.goals = ${project.groupId}:${project.artifactId}:${project.version}:list-plugin-repositories
diff --git a/src/it/projects/list-plugin-repositories/pom.xml b/src/it/projects/list-plugin-repositories/pom.xml
new file mode 100644
index 0000000..e871ea8
--- /dev/null
+++ b/src/it/projects/list-plugin-repositories/pom.xml
@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ ~ 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.
+ -->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+ <modelVersion>4.0.0</modelVersion>
+
+ <groupId>org.apache.maven.its.dependency</groupId>
+ <artifactId>test</artifactId>
+ <version>1.0-SNAPSHOT</version>
+
+ <name>Test</name>
+ <description>
+ Test dependency:list-plugin-repositories
+ </description>
+
+ <properties>
+ <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+ </properties>
+
+ <dependencies>
+ <dependency>
+ <groupId>org.apache.maven</groupId>
+ <artifactId>maven-project</artifactId>
+ <version>2.0.6</version>
+ </dependency>
+ </dependencies>
+
+</project>
diff --git a/src/main/java/org/apache/maven/plugins/dependency/resolvers/ListPluginRepositoriesMojo.java b/src/main/java/org/apache/maven/plugins/dependency/resolvers/ListPluginRepositoriesMojo.java
new file mode 100644
index 0000000..b4e16e8
--- /dev/null
+++ b/src/main/java/org/apache/maven/plugins/dependency/resolvers/ListPluginRepositoriesMojo.java
@@ -0,0 +1,66 @@
+package org.apache.maven.plugins.dependency.resolvers;
+
+/*
+ * 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.
+ */
+
+import java.util.List;
+
+import org.apache.maven.artifact.repository.ArtifactRepository;
+import org.apache.maven.plugin.MojoExecutionException;
+import org.apache.maven.plugins.annotations.Mojo;
+import org.apache.maven.plugins.annotations.Parameter;
+import org.apache.maven.shared.artifact.filter.collection.ArtifactsFilter;
+
+/**
+ * Goal that resolves all project plugins and then lists the plugin
+ * repositories used by the build and by the transitive plugins
+ *
+ * @since 3.2
+ */
+@Mojo( name = "list-plugin-repositories", threadSafe = true )
+public class ListPluginRepositoriesMojo
+ extends AbstractResolveMojo
+{
+
+ @Parameter( defaultValue = "${project.pluginArtifactRepositories}", readonly = true, required = true )
+ private List<ArtifactRepository> remotePluginRepositories;
+
+ /**
+ * Displays a list of the plugin repositories used by this build.
+ *
+ * @throws MojoExecutionException with a message if an error occurs.
+ */
+ @Override
+ protected void doExecute()
+ throws MojoExecutionException
+ {
+ this.getLog().info( "Plugin repositories used by this build:" );
+
+ for ( ArtifactRepository repo : remotePluginRepositories )
+ {
+ this.getLog().info( repo.toString() );
+ }
+ }
+
+ @Override
+ protected ArtifactsFilter getMarkedArtifactFilter()
+ {
+ return null;
+ }
+}
