Avoid checking for allowed plugins if plugins are disabled entirely, fixes #10925

src/Composer/Installer/PluginInstaller.php

@@ -52,8 +52,8 @@ class PluginInstaller extends LibraryInstaller
      */
     public function prepare($type, PackageInterface $package, PackageInterface $prevPackage = null)
     {
-        // fail install process early if it going to fail due to a plugin not being allowed
-        if ($type === 'install' || $type === 'update') {
+        // fail install process early if it is going to fail due to a plugin not being allowed
+        if (($type === 'install' || $type === 'update') && !$this->composer->getPluginManager()->arePluginsDisabled()) {
             $this->composer->getPluginManager()->isPluginAllowed($package->getName(), false);
         }
 

src/Composer/Plugin/PluginManager.php

@@ -678,6 +678,16 @@ class PluginManager
         return $rules;
     }
 
+    /**
+     * @internal
+     *
+     * @return bool
+     */
+    public function arePluginsDisabled()
+    {
+        return $this->disablePlugins;
+    }
+
     /**
      * @internal
      *