Merge branch 'mrrobot47-check/min-requirements' into develop-v4

Author: mbtamuli

php/EE/Runner.php

@@ -51,10 +51,25 @@ public function __get( $key ) {
 	 */
 	private function init_ee() {
 
+		// Minimum requirement checks.
+		$docker_running = 'docker ps > /dev/null';
+		if ( ! EE::exec( $docker_running ) ) {
+			EE::error( 'docker not installed or not running.' );
+		}
+
+		$docker_compose_installed = 'command -v docker-compose > /dev/null';
+		if ( ! EE::exec( $docker_compose_installed ) ) {
+			EE::error( 'EasyEngine requires docker-compose.' );
+		}
+
+		if ( version_compare( PHP_VERSION, '7.2.0' ) < 0 ) {
+			EE::error( 'EasyEngine requires minimum PHP 7.2.0 to run.' );
+		}
+
 		$this->ensure_present_in_config( 'locale', 'en_US' );
 		$this->ensure_present_in_config( 'ee_installer_version', 'stable' );
 
-		define( 'DB', EE_ROOT_DIR.'/db/ee.sqlite' );
+		define( 'DB', EE_ROOT_DIR . '/db/ee.sqlite' );
 		define( 'LOCALHOST_IP', '127.0.0.1' );
 
 		$db_dir = dirname( DB );