Support stream inheritance for the forked process, fixes #71

src/main/java/org/codehaus/mojo/exec/ExecMojo.java

@@ -148,6 +148,16 @@ public class ExecMojo
     @Parameter( property = "exec.outputFile" )
     private File outputFile;
 
+    /**
+     * Program standard input, output and error streams will be inherited from the maven process.
+     * This allow tighter control of the streams and the console.
+     *
+     * @since 3.0.1
+     * @see ProcessBuilder#inheritIO()
+     */
+    @Parameter( property = "exec.inheritIo" )
+    private boolean inheritIo;
+
     /**
      * When enabled, program standard and error output will be redirected to the
      * Maven logger as <i>Info</i> and <i>Error</i> level logs, respectively. If not enabled the
@@ -384,14 +394,18 @@ else if ( !StringUtils.isEmpty( argsProp ) )
 
             commandLine.addArguments( args, false );
 
-            Executor exec = new DefaultExecutor();
+            Executor exec = new ExtendedExecutor( inheritIo );
             if ( this.timeout > 0 )
             {
                 exec.setWatchdog( new ExecuteWatchdog( this.timeout ) );
             }
             exec.setWorkingDirectory( workingDirectory );
             fillSuccessCodes( exec );
 
+            if ( OS.isFamilyOpenVms() && inheritIo )
+            {
+                getLog().warn("The inheritIo flag is not supported on OpenVMS, execution will proceed without stream inheritance.");
+            }
             getLog().debug( "Executing command line: " + commandLine );
 
             try

src/main/java/org/codehaus/mojo/exec/ExtendedExecutor.java

@@ -0,0 +1,76 @@
+package org.codehaus.mojo.exec;
+
+/*
+ * 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 org.apache.commons.exec.CommandLine;
+import org.apache.commons.exec.DefaultExecutor;
+import org.apache.commons.exec.OS;
+import org.apache.commons.exec.launcher.CommandLauncherFactory;
+import org.apache.commons.exec.launcher.VmsCommandLauncher;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Map;
+
+/**
+ * An executor which has the ability to use the {@link ProcessBuilder#inheritIO()} flag.
+ *
+ * @author Guillaume Nodet ([email protected])
+ */
+public class ExtendedExecutor extends DefaultExecutor
+{
+
+    private final boolean inheritIo;
+
+    public ExtendedExecutor( boolean inheritIo )
+    {
+        this.inheritIo = inheritIo;
+    }
+
+    @Override
+    protected Process launch( CommandLine command, Map<String, String> env, File dir ) throws IOException
+    {
+        if ( dir != null && !dir.exists() )
+        {
+            throw new IOException( dir + " doesn't exist." );
+        }
+        if ( OS.isFamilyOpenVms() )
+        {
+            return new VmsCommandLauncher().exec( command, env, dir );
+        }
+        else
+        {
+            ProcessBuilder pb = new ProcessBuilder( command.toStrings() );
+            for ( Map.Entry<String, String> entry : env.entrySet() )
+            {
+                String key = entry.getKey() != null ? entry.getKey() : "";
+                String val = entry.getValue() != null ? entry.getValue() : "";
+                pb.environment().put( key, val );
+            }
+            pb.directory( dir );
+            if ( inheritIo )
+            {
+                pb.inheritIO();
+            }
+            return pb.start();
+        }
+    }
+
+}