Require confirmation for key:generate when changing key in production…

… mode

src/Illuminate/Foundation/Console/KeyGenerateCommand.php

@@ -3,15 +3,20 @@
 namespace Illuminate\Foundation\Console;
 
 use Illuminate\Console\Command;
+use Illuminate\Console\ConfirmableTrait;
 
 class KeyGenerateCommand extends Command
 {
+    use ConfirmableTrait;
+
     /**
      * The name and signature of the console command.
      *
      * @var string
      */
-    protected $signature = 'key:generate {--show : Display the key instead of modifying files}';
+    protected $signature = 'key:generate
+                            {--show : Display the key instead of modifying files}
+                            {--force : Force the operation to run when in production}';
 
     /**
      * The console command description.
@@ -36,7 +41,9 @@ public function fire()
         // Next, we will replace the application key in the environment file so it is
         // automatically setup for this developer. This key gets generated using a
         // secure random byte generator and is later base64 encoded for storage.
-        $this->setKeyInEnvironmentFile($key);
+        if (! $this->setKeyInEnvironmentFile($key)) {
+            return;
+        }
 
         $this->laravel['config']['app.key'] = $key;
 
@@ -47,15 +54,21 @@ public function fire()
      * Set the application key in the environment file.
      *
      * @param  string  $key
-     * @return void
+     * @return bool
      */
     protected function setKeyInEnvironmentFile($key)
     {
+        $currentKey = $this->laravel['config']['app.key'];
+        if (strlen($currentKey) !== 0 && (! $this->confirmToProceed())) {
+            return false;
+        }
         file_put_contents($this->laravel->environmentFilePath(), str_replace(
             'APP_KEY='.$this->laravel['config']['app.key'],
             'APP_KEY='.$key,
             file_get_contents($this->laravel->environmentFilePath())
         ));
+
+        return true;
     }
 
     /**