Allow the autoloader suffix to be configured from a project's composer.json

res/composer-schema.json

@@ -176,6 +176,10 @@
                     "type": ["string", "boolean"],
                     "description": "The default style of handling dirty updates, defaults to false and can be any of true, false or \"stash\"."
                 },
+                "autoloader-suffix": {
+                    "type": ["string", "boolean"],
+                    "description": "Optional string to be used as a suffix to the autoloader generator. When null a random one will be generated."
+                },
                 "prepend-autoloader": {
                     "type": "boolean",
                     "description": "If false, the composer autoloader will not be prepended to existing autoloaders, defaults to true."

src/Composer/Autoload/AutoloadGenerator.php

@@ -169,7 +169,7 @@ EOF;
         $classmapFile .= ");\n";
 
         if (!$suffix) {
-            $suffix = md5(uniqid('', true));
+            $suffix = $config->get('autoloader-suffix') ? $config->get('autoloader-suffix') : md5(uniqid('', true));
         }
 
         file_put_contents($targetDir.'/autoload_namespaces.php', $namespacesFile);

src/Composer/Config.php

@@ -35,6 +35,7 @@ class Config
         'cache-files-ttl' => null, // fallback to cache-ttl
         'cache-files-maxsize' => '300MiB',
         'discard-changes' => false,
+        'autoload-suffix' => false,
         'prepend-autoloader' => true,
         'github-domains' => array('github.com'),
     );