MAGETWO-63382: CLI Improvements: Configuration management - Command config:show

Author: Bohdan Korablov

app/code/Magento/Config/App/Config/Source/EnvironmentConfigSource.php

@@ -0,0 +1,71 @@
+<?php
+/**
+ * Copyright © 2013-2017 Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\Config\App\Config\Source;
+
+use Magento\Framework\App\Config\ConfigSourceInterface;
+use Magento\Framework\DataObject;
+use Magento\Config\Model\Placeholder\PlaceholderFactory;
+use Magento\Config\Model\Placeholder\PlaceholderInterface;
+use Magento\Framework\Stdlib\ArrayManager;
+
+/**
+ * Class for retrieving configuration from environment variables.
+ */
+class EnvironmentConfigSource implements ConfigSourceInterface
+{
+    /**
+     * @var ArrayManager
+     */
+    private $arrayManager;
+
+    /**
+     * @var PlaceholderInterface
+     */
+    private $placeholder;
+
+    public function __construct(
+        ArrayManager $arrayManager,
+        PlaceholderFactory $placeholderFactory
+    ) {
+        $this->arrayManager = $arrayManager;
+        $this->placeholder = $placeholderFactory->create(PlaceholderFactory::TYPE_ENVIRONMENT);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function get($path = '')
+    {
+        $data = new DataObject($this->loadConfig());
+        return $data->getData($path) ?: [];
+    }
+
+    /**
+     * Loads config from environment variables.
+     *
+     * @return array
+     */
+    private function loadConfig()
+    {
+        $config = [];
+
+        $environmentVariables = $_ENV;
+
+        foreach ($environmentVariables as $template => $value) {
+            if (!$this->placeholder->isApplicable($template)) {
+                continue;
+            }
+
+            $config = $this->arrayManager->set(
+                $this->placeholder->restore($template),
+                $config,
+                $value
+            );
+        }
+
+        return $config;
+    }
+}

app/code/Magento/Config/Console/Command/ConfigShow/ValueProcessor.php

@@ -19,11 +19,11 @@
 class ValueProcessor
 {
     /**
-     * System configuration structure.
+     * System configuration structure factory.
      *
-     * @var Structure
+     * @var StructureFactory
      */
-    private $configStructure;
+    private $configStructureFactory;
 
     /**
      * Factory of object that implement \Magento\Framework\App\Config\ValueInterface.
@@ -32,6 +32,11 @@ class ValueProcessor
      */
     private $configValueFactory;
 
+    /**
+     * @var ScopeInterface
+     */
+    private $scope;
+
     /**
      * @param ScopeInterface $scope
      * @param StructureFactory $structureFactory
@@ -42,8 +47,8 @@ public function __construct(
         StructureFactory $structureFactory,
         ValueFactory $valueFactory
     ) {
-        $scope->setCurrentScope(Area::AREA_ADMINHTML);
-        $this->configStructure = $structureFactory->create();
+        $this->scope = $scope;
+        $this->configStructureFactory = $structureFactory;
         $this->configValueFactory = $valueFactory;
     }
 
@@ -58,10 +63,17 @@ public function __construct(
      */
     public function process($scope, $scopeCode, $value, $path)
     {
+        $areaScope = $this->scope->getCurrentScope();
+        $this->scope->setCurrentScope(Area::AREA_ADMINHTML);
+        /** @var Structure $configStructure */
+        $configStructure = $this->configStructureFactory->create();
+        $this->scope->setCurrentScope($areaScope);
+
         /** @var Field $field */
-        $field = $this->configStructure->getElement($path);
+        $field = $configStructure->getElement($path);
+
         /** @var Value $backendModel */
-        $backendModel = $field->hasBackendModel()
+        $backendModel = $field && $field->hasBackendModel()
             ? $field->getBackendModel()
             : $this->configValueFactory->create();
         $backendModel->setPath($path);

app/code/Magento/Config/etc/di.xml

@@ -201,6 +201,10 @@
                     <item name="source" xsi:type="object">systemConfigInitialDataProvider</item>
                     <item name="sortOrder" xsi:type="string">1000</item>
                 </item>
+                <item name="env" xsi:type="array">
+                    <item name="source" xsi:type="object">Magento\Config\App\Config\Source\EnvironmentConfigSource</item>
+                    <item name="sortOrder" xsi:type="string">2000</item>
+                </item>
             </argument>
         </arguments>
     </virtualType>