From 10d1a4382ff35169170248c3bf74680f6e34bdc7 Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Tue, 4 Sep 2012 20:05:59 +0200
Subject: [PATCH] Only generate lock file when actually necessary, fixes #1064

---
 src/Composer/Package/Locker.php | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/Composer/Package/Locker.php b/src/Composer/Package/Locker.php
index 9b3d2cd25..d193fa1c5 100644
--- a/src/Composer/Package/Locker.php
+++ b/src/Composer/Package/Locker.php
@@ -198,6 +198,14 @@ class Locker
             $lock['packages-dev'] = $this->lockPackages($devPackages);
         }
 
+        if (empty($lock['packages']) && empty($lock['packages-dev'])) {
+            if ($this->lockFile->exists()) {
+                unlink($this->lockFile->getPath());
+            }
+
+            return false;
+        }
+
         if (!$this->isLocked() || $lock !== $this->getLockData()) {
             $this->lockFile->write($lock);
             $this->lockDataCache = null;