From: Simon Strandgaard <neoneye@...>
Date: 2004-04-30T08:50:37+09:00
Subject: Re: File.expand_path(__FILE__)

On Fri, 30 Apr 2004 05:28:43 +0900
John Platte <john.platte@nikaconsulting.com> wrote:

> I'm having a problem with File.expand_path(__FILE__) after a chdir. 
> Looks like a bug in Ruby to me. If someone can tell me what I'm doing 
> wrong, I'd be grateful.
> 
> Here's the reduction:
> 
> [ryan@kursk 15:26:38 ~]$ cat tmp/demo-problem.rb
> puts "starting working directory: " + Dir.getwd
> puts "expand_path: " + File.expand_path(__FILE__)
> puts "about to change to dirname of __FILE__: " + __FILE__
> Dir.chdir(File.dirname(__FILE__))
> puts "new working directory: " + Dir.getwd
> puts "expand_path: " + File.expand_path(__FILE__)

                                          ^^^^^^^^
                                            BOOM

I guess you assume that __FILE__ change when doing chdir.
But it doesn't



server> ruby a.rb 
"a.rb"
"/tmp"
"a.rb"
"/"
"a.rb"
"/tmp"
server> expand -t2 a.rb 
p __FILE__, Dir.pwd
Dir.chdir("..") do
  p __FILE__, Dir.pwd
end
p __FILE__, Dir.pwd
server>


As you can see, filenames doesn't change during chdir.


HTH,

--
Simon Strandgaard