First iteration of the Releases feature.

Mage/Task/BuiltIn/Deployment/Releases.php

@@ -0,0 +1,39 @@
+<?php
+class Mage_Task_BuiltIn_Deployment_Releases
+    extends Mage_Task_TaskAbstract
+{
+    public function getName()
+    {
+        return 'Releasing [built-in]';
+    }
+
+    public function run()
+    {
+        if (isset($this->_config['deploy']['releases']['enabled'])) {
+            if ($this->_config['deploy']['releases']['enabled'] == 'true') {
+                if (isset($this->_config['deploy']['releases']['directory'])) {
+                    $releasesDirectory = $this->_config['deploy']['releases']['directory'];
+                } else {
+                    $releasesDirectory = 'releases';
+                }
+                if (isset($this->_config['deploy']['releases']['symlink'])) {
+                    $symlink = $this->_config['deploy']['releases']['symlink'];
+                } else {
+                    $symlink = 'current';
+                }
+
+                $currentCopy = $releasesDirectory
+                             . '/' . $this->_config['deploy']['releases']['_id'];
+
+                $result = $this->_runRemoteCommand('ln -sf ' . $currentCopy . ' ' . $symlink);
+                return $result;
+
+            } else {
+                return false;
+            }
+        } else {
+            return false;
+        }
+    }
+
+}

Mage/Task/BuiltIn/Deployment/Rsync.php

@@ -4,7 +4,15 @@ class Mage_Task_BuiltIn_Deployment_Rsync
 {
     public function getName()
     {
-        return 'Rsync [built-in]';
+        if (isset($this->_config['deploy']['releases']['enabled'])) {
+            if ($this->_config['deploy']['releases']['enabled'] == 'true') {
+                return 'Rsync (with Releases) [built-in]';
+            } else {
+                return 'Rsync [built-in]';
+            }
+        } else {
+            return 'Rsync [built-in]';            
+        }
     }
 
     public function run()
@@ -23,10 +31,27 @@ class Mage_Task_BuiltIn_Deployment_Rsync
             $userExcludes = array();
         }
         
+        // If we are working with releases
+        $deployToDirectory = $this->_config['deploy']['deploy-to'];
+        if (isset($this->_config['deploy']['releases']['enabled'])) {
+            if ($this->_config['deploy']['releases']['enabled'] == 'true') {
+                if (isset($this->_config['deploy']['releases']['directory'])) {
+                    $releasesDirectory = $this->_config['deploy']['releases']['directory'];
+                } else {
+                    $releasesDirectory = 'releases';
+                }
+
+                $deployToDirectory = rtrim($this->_config['deploy']['deploy-to'], '/')
+                                   . '/' . $releasesDirectory
+                                   . '/' . $this->_config['deploy']['releases']['_id'];
+                $this->_runRemoteCommand('mkdir -p ' . $releasesDirectory . '/' . $this->_config['deploy']['releases']['_id']);
+            }
+        }
+
         $command = 'rsync -avz '
                  . $this->_excludes(array_merge($excludes, $userExcludes)) . ' '
                  . $this->_config['deploy']['deploy-from'] . ' '
-                 . $this->_config['deploy']['user'] . '@' . $this->_config['deploy']['host'] . ':' . $this->_config['deploy']['deploy-to'];
+                 . $this->_config['deploy']['user'] . '@' . $this->_config['deploy']['host'] . ':' . $deployToDirectory;
 
         $result = $this->_runLocalCommand($command);
         

Mage/Task/Deploy.php

@@ -2,6 +2,12 @@
 class Mage_Task_Deploy
 {
     private $_config = null;
+    private $_releaseId = null;
+    
+    public function __construct()
+    {
+        $this->_releaseId = date('YmdHis');
+    }
     
     public function run(Mage_Config $config)
     {
@@ -25,6 +31,14 @@ class Mage_Task_Deploy
                 Mage_Console::output('Deploying to <dark_gray>' . $host . '</dark_gray>');
                 
                 $tasksToRun = $config->getTasks();
+                if (isset($taskConfig['deploy']['releases'])) {
+                    if (isset($taskConfig['deploy']['releases']['enabled'])) {
+                        if ($taskConfig['deploy']['releases']['enabled'] == 'true') {
+                            $taskConfig['deploy']['releases']['_id'] = $this->_releaseId;
+                            array_push($tasksToRun, 'deployment/releases');
+                        }
+                    }
+                }
                 if (count($tasksToRun) == 0) {
                     Mage_Console::output('<light_purple>Warning!</light_purple> <dark_gray>No </dark_gray><light_cyan>Deployment</light_cyan> <dark_gray>tasks defined.</dark_gray>', 2);
                     Mage_Console::output('Deployment to <dark_gray>' . $host . '</dark_gray> skipped!', 1, 3);

docs/example-config/.mage/config/environment/production.yaml

@@ -3,9 +3,9 @@ user: root
 deploy-from: ./
 deploy-to: /var/www/vhosts/example.com/www
 releases:
-  - enabled: true
-  - symlink: current
-  - directory: releases
+  enabled: true
+  symlink: current
+  directory: releases
 hosts:
   - s01.example.com
   - s02.example.com