From d0a9550dea3235ea6ee1927840fab9644a6c9da0 Mon Sep 17 00:00:00 2001
From: Samuel ROZE <samuel.roze@gmail.com>
Date: Mon, 14 Sep 2015 15:20:06 +0100
Subject: [PATCH] Uses `realpath` to fix relative path issues

---
 src/Composer/Downloader/PathDownloader.php | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/Composer/Downloader/PathDownloader.php b/src/Composer/Downloader/PathDownloader.php
index c58a3f23a..409a27cae 100644
--- a/src/Composer/Downloader/PathDownloader.php
+++ b/src/Composer/Downloader/PathDownloader.php
@@ -39,18 +39,19 @@ class PathDownloader extends FileDownloader
         ));
 
         $url = $package->getDistUrl();
-        if (!file_exists($url) || !is_dir($url)) {
+        $realUrl = realpath($url);
+        if (false === $realUrl || !file_exists($realUrl) || !is_dir($realUrl)) {
             throw new \RuntimeException(sprintf(
                 'Path "%s" is not found',
-                $path
+                $url
             ));
         }
 
         try {
-            $fileSystem->symlink($url, $path);
+            $fileSystem->symlink($realUrl, $path);
             $this->io->writeError(sprintf('    Symlinked from %s', $url));
         } catch (IOException $e) {
-            $fileSystem->mirror($url, $path);
+            $fileSystem->mirror($realUrl, $path);
             $this->io->writeError(sprintf('    Mirrored from %s', $url));
         }