From 5498b8d6a04f5c111a0bbdf57af5dbdde5707d08 Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Thu, 24 May 2012 20:36:47 +0200
Subject: [PATCH] Add COMPOSER_ROOT_VERSION env var to override the root
 version

---
 doc/03-cli.md                                     | 5 +++++
 src/Composer/Package/Loader/RootPackageLoader.php | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/doc/03-cli.md b/doc/03-cli.md
index 94d5b001a..0c3343010 100644
--- a/doc/03-cli.md
+++ b/doc/03-cli.md
@@ -189,6 +189,11 @@ For example:
 
     $ COMPOSER=composer-other.json php composer.phar install
 
+### COMPOSER_ROOT_VERSION
+
+By setting this var you can specify the version of the root package, if it can
+not be guessed from VCS info and is not present in `composer.json`.
+
 ### COMPOSER_VENDOR_DIR
 
 By setting this var you can make composer install the dependencies into a
diff --git a/src/Composer/Package/Loader/RootPackageLoader.php b/src/Composer/Package/Loader/RootPackageLoader.php
index b88b3e866..b50e69d8b 100644
--- a/src/Composer/Package/Loader/RootPackageLoader.php
+++ b/src/Composer/Package/Loader/RootPackageLoader.php
@@ -53,6 +53,11 @@ class RootPackageLoader extends ArrayLoader
                 }
             }
 
+            // override with env var if available
+            if (getenv('COMPOSER_ROOT_VERSION')) {
+                $version = getenv('COMPOSER_ROOT_VERSION');
+            }
+
             $config['version'] = $version;
         } else {
             $version = $config['version'];