Added support for using container snapshot as source for migration

Author: turtle0x1

CHANGELOG.md

@@ -4,6 +4,11 @@ All Notable changes to `php-lxd` will be documented in this file.
 
 Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
 
+## [0.12.2]
+
+## Added
+ - Support for using container snapshot as source for migration
+
 ## [0.12.1]
 
 ### Added

src/Endpoint/Containers.php

@@ -367,11 +367,26 @@ public function migrate(
      */
     public function initMigration($name)
     {
-        $migration = $this->post($this->getEndpoint().$name, ['migration' => true]);
+        $containerName = "";
+
+        if (strpos($name, "/") !== false) {
+            $parts = explode("/", $name);
+            $partsLength = count($parts);
+            if ($partsLength == 0 || $partsLength > 2) {
+                throw new \Exception("Snapshot name format not correct", 1);
+            }
+            $containerName = $parts[0];
+            $container = $this->snapshots->info($containerName, $parts[1]);
+        } else {
+            $containerName = $name;
+            $container = $this->info($name);
+        }
+
+        $migration = $this->post($this->getEndpoint().$containerName, ['migration' => true]);
+
         $host = $this->client->host->info();
-        $container = $this->info($name);
-        $url = $this->client->getUrl().'/'.$this->client->getApiVersion().'/operations/'.$migration['id'];
 
+        $url = $this->client->getUrl().'/'.$this->client->getApiVersion().'/operations/'.$migration['id'];
 
         $settings = [
             'name'         => $name,