Backport update packagist default repo to be packagist.org

doc/05-repositories.md

@@ -686,7 +686,7 @@ You can disable the default Packagist repository by adding this to your
 {
     "repositories": [
         {
-            "packagist": false
+            "packagist.org": false
         }
     ]
 }

src/Composer/Config.php

@@ -67,7 +67,7 @@ class Config
     );
 
     public static $defaultRepositories = array(
-        'packagist' => array(
+        'packagist.org' => array(
             'type' => 'composer',
             'url' => 'https?://packagist.org',
             'allow_ssl_downgrade' => true,
@@ -157,23 +157,27 @@ class Config
             foreach ($newRepos as $name => $repository) {
                 // disable a repository by name
                 if (false === $repository) {
-                    unset($this->repositories[$name]);
+                    $this->disableRepoByName($name);
                     continue;
                 }
 
                 // disable a repository with an anonymous {"name": false} repo
                 if (is_array($repository) && 1 === count($repository) && false === current($repository)) {
-                    unset($this->repositories[key($repository)]);
+                    $this->disableRepoByName(key($repository));
                     continue;
                 }
 
                 // store repo
                 if (is_int($name)) {
                     $this->repositories[] = $repository;
+                } else {
+                    if ($name === 'packagist') { // BC support for default "packagist" named repo
+                        $this->repositories[$name . '.org'] = $repository;
                     } else {
                         $this->repositories[$name] = $repository;
                     }
                 }
+            }
             $this->repositories = array_reverse($this->repositories, true);
         }
     }
@@ -404,6 +408,15 @@ class Config
         return false;
     }
 
+    private function disableRepoByName($name)
+    {
+        if (isset($this->repositories[$name])) {
+            unset($this->repositories[$name]);
+        } else if ($name === 'packagist') { // BC support for default "packagist" named repo
+            unset($this->repositories['packagist.org']);
+        }
+    }
+
     /**
      * Validates that the passed URL is allowed to be used by current config, or throws an exception.
      *

tests/Composer/Test/Json/JsonManipulatorTest.php

@@ -292,7 +292,7 @@ class JsonManipulatorTest extends \PHPUnit_Framework_TestCase
     },
     "repositories": [
         {
-            "packagist": false
+            "packagist.org": false
         },
         {
             "type": "package",
@@ -773,7 +773,7 @@ class JsonManipulatorTest extends \PHPUnit_Framework_TestCase
     },
     "repositories": [
         {
-            "packagist": false
+            "packagist.org": false
         },
         {
             "type": "package",