private File getPluginDirAndInstallIfNecessary(final Artifact plugin) throws MojoExecutionException { boolean targetDirOverridden = true; File targetDir = getPluginTargetDirOverride(plugin); if (targetDir == null) { targetDirOverridden = false; targetDir = getPluginTargetDirCentral(plugin); } String pluginName = getPluginName(plugin); final String pluginVersion = plugin.getVersion(); boolean snapshot = pluginVersion.endsWith("-SNAPSHOT"); if (snapshot && plugin .getFile() .getAbsolutePath() .endsWith("target" + File.separator + "classes")) { // multi module build targetDir = plugin.getFile().getParentFile().getParentFile(); getLog() .info( String.format( "Plugin %s:%s is coming from a multi-module dependency (%s)", pluginName, pluginVersion, targetDir.getAbsolutePath())); } else if ((!snapshot && !targetDir.exists()) || (snapshot && !targetDirOverridden)) { // Unpack the plugin if it hasn't already been or if its a SNAPSHOT and not overridden by // -Dflag // Ideally we need to now do two things (a) see if we are running JDK7 // and (b) determine if -Dplugin.groupId.artifactId has been set - if this is so, we want to // do a Files.createLink // to the directory specified by the -D flag. We should probably also check if the targetDir // is a link and // the -Dflag hasn't been set, in which case we'd want to remove the link and install the // plugin (and let the user // know this has happened. // We wouldn't actually want this to be allowed when doing a release however.... So people // should make sure they don't // specify them, they they'll be installed. getLog() .info( String.format( "Installing Plugin %s:%s into (%s)", pluginName, pluginVersion, targetDir.getAbsolutePath())); targetDir.mkdirs(); final ZipUnArchiver unzipper = new ZipUnArchiver(); unzipper.enableLogging(new ConsoleLogger(Logger.LEVEL_ERROR, "zip-unarchiver")); unzipper.setSourceFile(plugin.getFile()); unzipper.setDestDirectory(targetDir); unzipper.setOverwrite(true); try { unzipper.extract(); } catch (ArchiverException e) { throw new MojoExecutionException("Unable to extract zip", e); } try { File inputPom = new File(plugin.getFile().getParentFile(), pluginName + "-" + pluginVersion + ".pom"); File outputPom = new File(targetDir, "pom.xml"); getLog() .info( String.format( "copying %s to %s", inputPom.getAbsolutePath(), outputPom.getAbsolutePath())); FileReader fr = new FileReader(inputPom); FileWriter fw = new FileWriter(outputPom); IOUtils.copy(fr, fw); fw.flush(); fw.close(); fr.close(); } catch (IOException e) { throw new MojoExecutionException("Unable to copy pom.xml file"); } } else { getLog() .info( String.format( "Plugin %s:%s already installed (%s)", pluginName, pluginVersion, targetDir.getAbsolutePath())); } return targetDir; }