JENKINS-12397: Skip deploying of artifacts when release build is running.

Monitor environment variable defined by user. If the variable is set to "true" the deployment is skipped. The M2 Release plugin expose this kind of variables.

maven-plugin/src/main/java/hudson/maven/RedeployPublisher.java

@@ -92,30 +92,48 @@ public class RedeployPublisher extends Recorder {
     public final String url;
     public final boolean uniqueVersion;
     public final boolean evenIfUnstable;
+    public final String releaseEnvVar;
 
     /**
      * For backward compatibility
      */
     @Deprecated
     public RedeployPublisher(String id, String url, boolean uniqueVersion) {
-    	this(id, url, uniqueVersion, false);
+    	this(id, url, uniqueVersion, false, null);
     }
     
     /**
      * @since 1.347
      */
-    @DataBoundConstructor
+    @Deprecated
     public RedeployPublisher(String id, String url, boolean uniqueVersion, boolean evenIfUnstable) {
+        this(id, url, uniqueVersion, evenIfUnstable, null);
+    }
+    
+    @DataBoundConstructor
+    public RedeployPublisher(String id, String url, boolean uniqueVersion, boolean evenIfUnstable, String releaseEnvVar) {
         this.id = id;
         this.url = Util.fixEmptyAndTrim(url);
         this.uniqueVersion = uniqueVersion;
         this.evenIfUnstable = evenIfUnstable;
+        this.releaseEnvVar = Util.fixEmptyAndTrim(releaseEnvVar);
     }
 
     public boolean perform(AbstractBuild<?, ?> build, Launcher launcher, BuildListener listener) throws InterruptedException, IOException {
         if (build.getResult().isWorseThan(getTreshold()))
             return true;    // build failed. Don't publish
 
+        /**
+         * Check if we should skip or not
+         */
+        if (releaseEnvVar != null) {
+        	String envVarValue = build.getEnvironment(listener).get(releaseEnvVar);
+        	if ("true".equals(envVarValue)) { // null or false are ignored
+        		listener.getLogger().println("[INFO] Skipping deploying artifact as release build is in progress.");
+        		return true; // skip the deploy
+        	}
+        }
+        
         List<MavenAbstractArtifactRecord> mavenAbstractArtifactRecords = getActions(build, listener);
         if (mavenAbstractArtifactRecords == null || mavenAbstractArtifactRecords.isEmpty()) {
             listener.getLogger().println("[ERROR] No artifacts are recorded. Is this a Maven project?");

maven-plugin/src/main/resources/hudson/maven/RedeployPublisher/config.jelly

@@ -34,6 +34,9 @@ THE SOFTWARE.
     <f:entry field="uniqueVersion">
       <f:checkbox title="${%Assign unique versions to snapshots}" default="true"/>
     </f:entry>
+    <f:entry title="${%Release environment variable}" field="releaseEnvVar" >
+      <f:textbox />
+    </f:entry>
     <j:if test="${descriptor.showEvenIfUnstableOption()}">
       <f:entry field="evenIfUnstable">
         <f:checkbox title="${%Deploy even if the build is unstable}" />

maven-plugin/src/main/resources/hudson/maven/RedeployPublisher/help-releaseEnvVar.html

+<div>
+  If the given variable name is set to "true" the deploy steps is skipped. Useful when using m2 release plugin.
+</div>
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