MAGETWO-82462: [Backport 2.1-develop] #11586 Fix duplicated crontab 2>&1 expression #11590

 - Merge Pull Request #11590 from adrian-martinez-interactiv4/magento2:FR21#CRON-INSTALL-PARSE-STDERR
 - Merged commits:
   1. 46cf1b6
   2. dde32da
   3. 4478cf4

Author: orlangur

lib/internal/Magento/Framework/Shell/CommandRenderer.php

@@ -16,9 +16,11 @@ class CommandRenderer implements CommandRendererInterface
      */
     public function render($command, array $arguments = [])
     {
+        $command = preg_replace('/(\s+2>&1)*(\s*\|)|$/', ' 2>&1$2', $command);
         $arguments = array_map('escapeshellarg', $arguments);
-        $command = preg_replace('/\s?\||$/', ' 2>&1$0', $command);
-        $command = vsprintf($command, $arguments);
-        return $command;
+        if (empty($arguments)) {
+            return $command;
+        }
+        return vsprintf($command, $arguments);
     }
 }

lib/internal/Magento/Framework/Shell/Test/Unit/CommandRendererTest.php

@@ -5,18 +5,40 @@
  */
 namespace Magento\Framework\Shell\Test\Unit;
 
-use \Magento\Framework\Shell\CommandRenderer;
+use Magento\Framework\Shell\CommandRenderer;
 
 class CommandRendererTest extends \PHPUnit_Framework_TestCase
 {
-    public function testRender()
+    /**
+     * @param $expectedCommand
+     * @param $actualCommand
+     * @param $testArguments
+     * @dataProvider commandsDataProvider
+     */
+    public function testRender($expectedCommand, $actualCommand, $testArguments)
     {
-        $testArgument  = 'argument';
-        $testArgument2 = 'argument2';
         $commandRenderer = new CommandRenderer();
         $this->assertEquals(
-            "php -r " . escapeshellarg($testArgument) . " 2>&1 | grep " . escapeshellarg($testArgument2) . " 2>&1",
-            $commandRenderer->render('php -r %s | grep %s', [$testArgument, $testArgument2])
+            $expectedCommand,
+            $commandRenderer->render($actualCommand, $testArguments)
         );
     }
+
+    public function commandsDataProvider()
+    {
+        $testArgument  = 'argument';
+        $testArgument2 = 'argument2';
+
+        $expectedCommand = "php -r %s 2>&1 | grep %s 2>&1";
+        $expectedCommandArgs = "php -r '" . $testArgument . "' 2>&1 | grep '" . $testArgument2 . "' 2>&1";
+
+        return [
+            [$expectedCommand, 'php -r %s | grep %s', []],
+            [$expectedCommand, 'php -r %s 2>&1 | grep %s', []],
+            [$expectedCommand, 'php -r %s 2>&1 2>&1 | grep %s', []],
+            [$expectedCommandArgs, 'php -r %s | grep %s', [$testArgument, $testArgument2]],
+            [$expectedCommandArgs, 'php -r %s 2>&1 | grep %s', [$testArgument, $testArgument2]],
+            [$expectedCommandArgs, 'php -r %s 2>&1 2>&1 | grep %s', [$testArgument, $testArgument2]],
+        ];
+    }
 }