From b519d65bff28234df810ed52c8fbdf92b778daa0 Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Fri, 5 Apr 2013 15:01:18 +0200
Subject: [PATCH] Do not throw exception on install --dev with old lock files
 if composer.json has no require-dev

---
 src/Composer/Installer.php | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/Composer/Installer.php b/src/Composer/Installer.php
index 132958622..c6d381ebc 100644
--- a/src/Composer/Installer.php
+++ b/src/Composer/Installer.php
@@ -295,7 +295,16 @@ class Installer
         $installFromLock = false;
         if (!$this->update && $this->locker->isLocked()) {
             $installFromLock = true;
-            $lockedRepository = $this->locker->getLockedRepository($withDevReqs);
+            try {
+                $lockedRepository = $this->locker->getLockedRepository($withDevReqs);
+            } catch (\RuntimeException $e) {
+                // if there are dev requires, then we really can not install
+                if ($this->package->getDevRequires()) {
+                    throw $e;
+                }
+                // no require-dev in composer.json and the lock file was created with no dev info, so skip them
+                $lockedRepository = $this->locker->getLockedRepository();
+            }
         }
 
         $this->whitelistUpdateDependencies(