From 93e08fd78e28f8323a8b4f61fd1920542764f598 Mon Sep 17 00:00:00 2001
From: vlakoff <vlakoff@gmail.com>
Date: Thu, 3 Mar 2016 18:49:21 +0100
Subject: [PATCH] Also clean backups if no Composer update actually performed

---
 src/Composer/Command/SelfUpdateCommand.php | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/Composer/Command/SelfUpdateCommand.php b/src/Composer/Command/SelfUpdateCommand.php
index 32dae3baa..0562c9b73 100644
--- a/src/Composer/Command/SelfUpdateCommand.php
+++ b/src/Composer/Command/SelfUpdateCommand.php
@@ -105,6 +105,11 @@ EOT
         if (Composer::VERSION === $updateVersion) {
             $io->writeError('<info>You are already using composer version '.$updateVersion.'.</info>');
 
+            // remove all backups except for the most recent, if any
+            if ($input->getOption('clean-backups')) {
+                $this->cleanBackups($rollbackDir, $this->getLastBackupVersion());
+            }
+
             return 0;
         }
 
@@ -315,13 +320,16 @@ TAGSPUBKEY
         }
     }
 
-    protected function cleanBackups($rollbackDir)
+    protected function cleanBackups($rollbackDir, $except = null)
     {
         $finder = $this->getOldInstallationFinder($rollbackDir);
         $io = $this->getIO();
         $fs = new Filesystem;
 
         foreach ($finder as $file) {
+            if ($except && $file->getBasename(self::OLD_INSTALL_EXT) === $except) {
+                continue;
+            }
             $file = (string) $file;
             $io->writeError('<info>Removing: '.$file.'</info>');
             $fs->remove($file);