From 9bee2ca28eea068f108ac4398fe82f12a8af6bc1 Mon Sep 17 00:00:00 2001
From: Markus Staab <markus.staab@redaxo.de>
Date: Mon, 5 Mar 2018 09:45:48 +0100
Subject: [PATCH] make sure we only cache resources which contain a svn
 revision

like we do in the VCS driver.

Closes #7158
---
 src/Composer/Repository/Vcs/SvnDriver.php | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/Composer/Repository/Vcs/SvnDriver.php b/src/Composer/Repository/Vcs/SvnDriver.php
index 1faba8195..b963f6856 100644
--- a/src/Composer/Repository/Vcs/SvnDriver.php
+++ b/src/Composer/Repository/Vcs/SvnDriver.php
@@ -115,19 +115,29 @@ class SvnDriver extends VcsDriver
         return null;
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    protected function shouldCache($identifier)
+    {
+        return $this->cache && preg_match('{@\d+$}', $identifier);
+    }
+
     /**
      * {@inheritdoc}
      */
     public function getComposerInformation($identifier)
     {
         if (!isset($this->infoCache[$identifier])) {
-            if ($res = $this->cache->read($identifier.'.json')) {
+            if ($this->shouldCache($identifier) && $res = $this->cache->read($identifier.'.json')) {
                 return $this->infoCache[$identifier] = JsonFile::parseJson($res);
             }
 
             $composer = $this->getBaseComposerInformation($identifier);
 
-            $this->cache->write($identifier.'.json', json_encode($composer));
+            if ($this->shouldCache($identifier)) {
+                $this->cache->write($identifier.'.json', json_encode($composer));
+            }
 
             $this->infoCache[$identifier] = $composer;
         }