From c301b2704326bcc2867f07210ad3cb7b0d9de0ce Mon Sep 17 00:00:00 2001
From: Roland Walker <walker@pobox.com>
Date: Thu, 31 Jul 2014 10:02:57 -0400
Subject: [PATCH] force permissions and delete ACLs if rmtree fails

This logic is ugly as the installation directory will be left
in a mangled state if it fails partway through.  However, the
same is true when `rmtree` fails partway through, which this
code is intended to minimize.

References: #5504
---
 lib/cask/installer.rb | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/lib/cask/installer.rb b/lib/cask/installer.rb
index 862807bc8fd40..f01aee1e22d7b 100644
--- a/lib/cask/installer.rb
+++ b/lib/cask/installer.rb
@@ -125,7 +125,16 @@ def uninstall_artifacts
   def purge_files
     odebug "Purging files"
     if @cask.destination_path.exist?
-      @cask.destination_path.rmtree
+      begin
+        @cask.destination_path.rmtree
+      rescue
+        # in case of permissions problems
+        if @cask.destination_path.exist?
+          @command.run('/bin/chmod', :args => ['-R', '--', 'u+rwx', @cask.destination_path])
+          @command.run('/bin/chmod', :args => ['-R', '-N',          @cask.destination_path])
+          @cask.destination_path.rmtree
+        end
+      end
     end
     @cask.caskroom_path.rmdir_if_possible
   end