Fix case where symlink:true still can downgrade to a copy on windows,…

… refs #10482
composer · Feb 2, 2022 · 45bbe43 · 45bbe43
1 parent 7591ef0
commit 45bbe43
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/Composer/Downloader/PathDownloader.php b/src/Composer/Downloader/PathDownloader.php
@@ -272,6 +272,9 @@ private function computeAllowedStrategies(array $transportOptions)
 
         // Check we can use junctions safely if we are on Windows
         if (Platform::isWindows() && self::STRATEGY_SYMLINK === $currentStrategy && !$this->safeJunctions()) {
+            if (!in_array(self::STRATEGY_MIRROR, $allowedStrategies)) {
+                throw new \RuntimeException('You are on an old Windows / old PHP combo which does not allow Composer to use junctions/symlinks and this path repository has symlink:true in its options so copying is not allowed');
+            }
             $currentStrategy = self::STRATEGY_MIRROR;
             $allowedStrategies = array(self::STRATEGY_MIRROR);
         }