From: Nicholas Manning <nicholas.manning@...>
Date: 2009-05-20T00:01:30+09:00
Subject: tempfile.rb and unlink on windows

PROBLEM

Was setting up a rails projects on a windows machine for and the project
required RubyInline.  When running rake db:migrate for the first time
RubyInline creates a temp file to ensure it can have access to something
like /tmp/ruby_inline but causes an error:

rake aborted!
File exists - /tmp/ruby_inline3712-0

The problem here is that on windows, doing something like (in order to
emulate this problem)

ruby -r tempfile -e 'Tempfile.new("foo").unlink'

Will *not* work on Windows (XP Pro).

COMMENTS

Whoever freakin wrote Tempfile#unlink had this little gem in the code:
    rescue Errno::EACCES
      # may not be able to unlink on Windows; just ignore
So if it can't delete (unlink) the file it just silently fails - not
cool.

SOLUTION

After reading this post:
http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-core/2848   I
applied the following patch and it worked finally (thanks to Florian
Frank who wrote it).

--- lib/tempfile.rb     23 Jul 2003 16:37:35 -0000      1.19
+++ lib/tempfile.rb     5 May 2004 23:33:57 -0000
@@ -106,7 +106,10 @@ class Tempfile < SimpleDelegator
   # file.
   def unlink
     # keep this order for thread safeness
-    File.unlink(@tmpname) if File.exist?(@tmpname)
+    if File.exist?(@tmpname)
+      closed? or close
+      File.unlink(@tmpname)
+    end
     @@cleanlist.delete(@tmpname) if @@cleanlist
   end
   alias delete unlink


Can anyone provide any insight on this?
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