ZP-641 migrate old permanent backend storage file.

Released under the Affero GNU General Public License (AGPL) version 3.

this avoid a full resync of all imap users (at least)
Signed-off-by: Etienne CHAMPETIER <champetier.etienne@gmail.com>

src/lib/default/filestatemachine.php

@@ -120,6 +120,9 @@ class FileStateMachine implements IStateMachine {
      * @throws StateNotFoundException, StateInvalidException
      */
     public function GetState($devid, $type, $key = false, $counter = false, $cleanstates = true) {
+        if ($type == IStateMachine::BACKENDSTORAGE && $key && strlen($key) == 40) {
+            $this->AddKeyToState($devid, $type, $key, $counter);
+        }
         if ($counter && $cleanstates)
             $this->CleanStates($devid, $type, $key, $counter);
 
@@ -137,6 +140,22 @@ class FileStateMachine implements IStateMachine {
             throw new StateNotFoundException(sprintf("FileStateMachine->GetState(): Could not locate state '%s'",$filename));
     }
 
+    /**
+     * function to migrate old backendstorage state
+     *
+     * @param string    $devid              the device id
+     * @param string    $type               the state type
+     * @param string    $key                the state key
+     * @param string    $counter            the state counter
+     */
+    private function AddKeyToState($devid, $type, $key, $counter) {
+        $old = $this->getFullFilePath($devid, $type, false, $counter);
+        $new = $this->getFullFilePath($devid, $type, $key, $counter);
+        if (@rename($old, $new)) {
+            ZLog::Write(LOGLEVEL_INFO, sprintf("FileStateMachine->AddKeyToState() on file: '%s'", $new));
+        }
+    }
+
     /**
      * Writes ta state to for a key and counter
      *