Fix unpacking on create-project

Author: nicolas-grekas

src/Flex.php

@@ -28,6 +28,7 @@
 use Composer\Installer\PackageEvent;
 use Composer\Installer\PackageEvents;
 use Composer\Installer\SuggestedPackagesReporter;
+use Composer\IO\ConsoleIO;
 use Composer\IO\IOInterface;
 use Composer\IO\NullIO;
 use Composer\Json\JsonFile;
@@ -46,6 +47,7 @@
 use Composer\Script\Event;
 use Composer\Script\ScriptEvents;
 use Symfony\Component\Console\Input\ArgvInput;
+use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Flex\Event\UpdateEvent;
 use Symfony\Flex\Unpack\Operation;
 use Symfony\Thanks\Thanks;
@@ -56,8 +58,16 @@
  */
 class Flex implements PluginInterface, EventSubscriberInterface
 {
+    /**
+     * @var Composer
+     */
     private $composer;
+
+    /**
+     * @var IOInterface
+     */
     private $io;
+
     private $config;
     private $options;
     private $configurator;
@@ -415,14 +425,30 @@ public function update(Event $event = null, $operations = [])
         }, $this->installer, $this->installer)();
         $this->composer->getEventDispatcher()->__construct($this->composer, $this->io);
 
+        $status = $this->installer->run();
+        if (0 !== $status) {
+            exit($status);
+        }
+
         $unpacker = new Unpacker($this->composer, new PackageResolver($this->downloader), $this->dryRun);
         $result = $unpacker->unpack($unpackOp);
         $unpacker->updateLock($result, $this->io);
 
-        $status = $this->installer->run();
-        if (0 !== $status) {
-            exit($status);
+        if ($this->io instanceof ConsoleIO) {
+            \Closure::bind(function () {
+                $this->output->setVerbosity(OutputInterface::VERBOSITY_QUIET);
+            }, $this->io, $this->io)();
         }
+
+        \Closure::bind(function ($locker) {
+            $this->locker = $locker;
+            $this->dumpAutoloader = false;
+            $this->runScripts = false;
+            $this->ignorePlatformReqs = true;
+            $this->update = false;
+        }, $this->installer, $this->installer)($this->composer->getLocker());
+
+        $this->installer->run();
     }
 
     public function install(Event $event = null)