From 414586ba0509b925fef9e8e5b3427cb2850996c4 Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Wed, 10 Mar 2021 10:45:40 +0100
Subject: [PATCH] Attempt working around Vagrant filesystem issues, added
 COMPOSER_RUNTIME_ENV env var (set to vagrant), fixes #9627

---
 .../Installer/InstallationManager.php         |  3 ++
 src/Composer/Installer/PluginInstaller.php    |  2 ++
 src/Composer/Util/Platform.php                | 36 +++++++++++++++++++
 3 files changed, 41 insertions(+)

diff --git a/src/Composer/Installer/InstallationManager.php b/src/Composer/Installer/InstallationManager.php
index 01148583a..8cbf62668 100644
--- a/src/Composer/Installer/InstallationManager.php
+++ b/src/Composer/Installer/InstallationManager.php
@@ -26,6 +26,7 @@ use Composer\DependencyResolver\Operation\MarkAliasInstalledOperation;
 use Composer\DependencyResolver\Operation\MarkAliasUninstalledOperation;
 use Composer\EventDispatcher\EventDispatcher;
 use Composer\Util\Loop;
+use Composer\Util\Platform;
 use React\Promise\PromiseInterface;
 
 /**
@@ -440,6 +441,8 @@ class InstallationManager
             $this->waitOnPromises($promises);
         }
 
+        Platform::workaroundFilesystemIssues();
+
         foreach ($postExecCallbacks as $cb) {
             $cb();
         }
diff --git a/src/Composer/Installer/PluginInstaller.php b/src/Composer/Installer/PluginInstaller.php
index 5c63a6d1f..e41938816 100644
--- a/src/Composer/Installer/PluginInstaller.php
+++ b/src/Composer/Installer/PluginInstaller.php
@@ -18,6 +18,7 @@ use Composer\Repository\InstalledRepositoryInterface;
 use Composer\Package\PackageInterface;
 use Composer\Util\Filesystem;
 use Composer\Installer\InstallationManager;
+use Composer\Util\Platform;
 use React\Promise\PromiseInterface;
 
 /**
@@ -97,6 +98,7 @@ class PluginInstaller extends LibraryInstaller
 
         return $promise->then(function () use ($self, $pluginManager, $initial, $target, $repo) {
             try {
+                Platform::workaroundFilesystemIssues();
                 $pluginManager->deactivatePackage($initial, true);
                 $pluginManager->registerPackage($target, true);
             } catch (\Exception $e) {
diff --git a/src/Composer/Util/Platform.php b/src/Composer/Util/Platform.php
index aeddce5e6..a18af5356 100644
--- a/src/Composer/Util/Platform.php
+++ b/src/Composer/Util/Platform.php
@@ -19,6 +19,9 @@ namespace Composer\Util;
  */
 class Platform
 {
+    /** @var ?bool */
+    private static $isVagrantGuest = null;
+
     /**
      * Parses tildes and environment variables in paths.
      *
@@ -117,4 +120,37 @@ class Platform
         // Check if formatted mode is S_IFCHR
         return $stat ? 0020000 === ($stat['mode'] & 0170000) : false;
     }
+
+    public static function workaroundFilesystemIssues()
+    {
+        if (self::isVagrantGuest()) {
+            usleep(200000);
+        }
+    }
+
+    /**
+     * Attempts detection of vagrant guest VMs
+     *
+     * This works based on the process' user being "vagrant", or the COMPOSER_RUNTIME_ENV env var being set to "vagrant"
+     *
+     * @return bool
+     */
+    private static function isVagrantGuest()
+    {
+        if (null === self::$isVagrantGuest) {
+            self::$isVagrantGuest = false;
+            if (!self::isWindows() && function_exists('posix_getpwuid') && function_exists('posix_geteuid')) {
+                $processUser = posix_getpwuid(posix_geteuid());
+                if ($processUser && $processUser['name'] === 'vagrant') {
+                    return self::$isVagrantGuest = true;
+                }
+            }
+
+            if (getenv('COMPOSER_RUNTIME_ENV') === 'vagrant') {
+                return self::$isVagrantGuest = true;
+            }
+        }
+
+        return self::$isVagrantGuest;
+    }
 }