Verify if environment is defined. Verify that rollback has release point.

Mage/Config.php

@@ -23,7 +23,13 @@ class Mage_Config
                              . '/' . md5(microtime()) . '/';
                 $this->_environment['deployment']['source']['temporal'] = $newTemporal;
             }
+
+            return true;
+        } else if (($environment != '') && !file_exists('.mage/config/environment/' . $environment . '.yml')) {
+            return false;
         }
+
+        return true;
     }
 
     public function loadSCM()

Mage/Console.php

@@ -125,7 +125,7 @@ class Mage_Console
         // Load Config
         $config = new Mage_Config;
         $config->loadGeneral();
-        $config->loadEnvironment($this->getEnvironment());
+        $environmentOk = $config->loadEnvironment($this->getEnvironment());
         $config->loadSCM();
 
         // Logging
@@ -142,6 +142,10 @@ class Mage_Console
             Mage_Console::output('Starting <blue>Magallanes</blue>', 0, 2);
         }
 
+        if (!$environmentOk) {
+            Mage_Console::output('<red>You have selected an invalid environment</red>', 0, 2);
+
+        } else {
             switch ($this->getAction()) {
                 case 'deploy':
                     $task = new Mage_Task_Deploy;
@@ -150,12 +154,21 @@ class Mage_Console
 
                 case 'releases':
                     $task = new Mage_Task_Releases;
+                    if (!isset($this->_args[1])) {
+                        Mage_Console::output('<red>You must indicate a task</red>', 0, 2);
+                        break;
+                    }
                     switch ($this->_args[1]) {
                         case 'list':
                             $task->setAction($this->_args[1]);
                             break;
 
                         case 'rollback':
+                            if (!isset($this->_args[2])) {
+                                Mage_Console::output('<red>You must indicate a release point</red>', 0, 2);
+                                break 2;
+                            }
+
                             $task->setAction($this->_args[1]);
                             $task->setRelease($this->_args[2]);
                             break;
@@ -211,6 +224,7 @@ class Mage_Console
                     Mage_Console::output('<red>Invalid action</red>', 0, 2);
                     break;
             }
+        }
 
         if ($showGrettings) {
             Mage_Console::output('Finished <blue>Magallanes</blue>', 0, 2);

Mage/Task/Deploy.php

@@ -18,6 +18,11 @@ class Mage_Task_Deploy
         $this->_startTime = time();
         $this->_config = $config;
 
+        if ($config->getEnvironment() == '') {
+            Mage_Console::output('<red>You must specify an environment</red>', 0, 2);
+            return;
+        }
+
         // Run Pre-Deployment Tasks
         $this->_runNonDeploymentTasks('pre-deploy', $config, 'Pre-Deployment');
 

Mage/Task/Releases.php

@@ -31,6 +31,11 @@ class Mage_Task_Releases
     {
         $this->_config = $config;
 
+        if ($config->getEnvironment() == '') {
+            Mage_Console::output('<red>You must specify an environment</red>', 0, 2);
+            return;
+        }
+
         // Run Tasks for Deployment
         $hosts = $config->getHosts();