consolidation#497 Add Basic Self Update Functionality

... a progress bar would be nice :-)

src/Application.php

@@ -28,6 +28,9 @@ public function __construct($name, $version)
             ->addOption(
                 new InputOption('--define', '-D', InputOption::VALUE_REQUIRED | InputOption::VALUE_IS_ARRAY, 'Define a configuration item value.', [])
             );
+
+        $selfUpdateCommand = new SelfUpdateCommand('self:update');
+        $this->add($selfUpdateCommand);
     }
 
     /**

src/SelfUpdateCommand.php

@@ -0,0 +1,129 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Robo;
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Filesystem\Filesystem as sfFilesystem;
+
+/**
+ * Update the robo.phar from the latest github release
+ *
+ * @author Alexander Menk <[email protected]>
+ */
+class SelfUpdateCommand extends Command
+{
+    private $command;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+	    $this
+		    ->setName('self-update')
+		    ->setAliases(array('selfupdate'))
+		    ->setDescription('Updates the robo.phar to the latest version.')
+		    ->setHelp(
+			    <<<EOT
+The <info>self-update</info> command checks github for newer
+versions of robo and if found, installs the latest.
+EOT
+		    )
+	    ;
+    }
+
+    protected function getLatestReleaseFromGithub($repository)
+    {
+	    $opts = [
+		    'http' => [
+			    'method' => 'GET',
+			    'header' => [
+				    'User-Agent: PHP'
+			    ]
+		    ]
+	    ];
+
+	    $context = stream_context_create($opts);
+
+	    $releases = file_get_contents('https://api.github.com/repos/' . $repository . '/releases', false, $context);
+	    $releases = json_decode($releases);
+
+	    if (!isset($releases[0])) {
+	        throw new \Exception('API error - no release found at GitHub repository ' . $repository);
+        }
+
+	    $version = $releases[0]->tag_name;
+	    $url = $releases[0]->assets[0]->browser_download_url;
+
+	    return [$version, $url];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+	    $localFilename = realpath($_SERVER['argv'][0]) ?: $_SERVER['argv'][0];
+	    $programName = basename($localFilename);
+	    $tempFilename = dirname($localFilename) . '/' . basename($localFilename, '.phar') . '-temp.phar';
+
+	    // check for permissions in local filesystem before start connection process
+	    if (!is_writable($tempDirectory = dirname($tempFilename))) {
+		    throw new \Exception(
+			    $programName . ' update failed: the "' . $tempDirectory .
+			    '" directory used to download the temp file could not be written'
+		    );
+	    }
+
+	    if (!is_writable($localFilename)) {
+		    throw new \Exception(
+			    $programName . ' update failed: the "' . $localFilename . '" file could not be written'
+		    );
+	    }
+
+	    list($latest, $downloadUrl) = $this->getLatestReleaseFromGithub('consolidation/robo');
+
+
+	    if (Robo::VERSION == $latest) {
+	    	$output->writeln('No update available');
+	    }
+
+	    $fs = new sfFilesystem();
+
+	    $output->writeln('Downloading ' . Robo::APPLICATION_NAME . ' ' . $latest);
+
+	    $fs->copy($downloadUrl, $tempFilename);
+
+	    $output->writeln('Download finished');
+
+	    try {
+		    \error_reporting(E_ALL); // supress notices
+
+		    @chmod($tempFilename, 0777 & ~umask());
+		    // test the phar validity
+		    $phar = new \Phar($tempFilename);
+		    // free the variable to unlock the file
+		    unset($phar);
+		    @rename($tempFilename, $localFilename);
+		    $output->writeln('<info>Successfully updated ' . $programName . '</info>');
+	    } catch (\Exception $e) {
+		    @unlink($tempFilename);
+		    if (!$e instanceof \UnexpectedValueException && !$e instanceof \PharException) {
+			    throw $e;
+		    }
+		    $output->writeln('<error>The download is corrupted (' . $e->getMessage() . ').</error>');
+		    $output->writeln('<error>Please re-run the self-update command to try again.</error>');
+	    }
+    }
+}