Rake + FileUtils == warining

When I require both rake and FileUtils, i.e.

require ‘rake’ # for String#ext
require ‘FileUtils’

I get the following warnings:

c:/ruby186/lib/ruby/1.8/FileUtils.rb:93: warning: already initialized
constant OPT_TABLE
c:/ruby186/lib/ruby/1.8/FileUtils.rb:1163: warning: already initialized
constant S_IF_DOOR
c:/ruby186/lib/ruby/1.8/FileUtils.rb:1513: warning: already initialized
constant METHODS

Who is to blame? FileUtils, rake, or me (because I’m not supposed to
require both)?

What can I do to avoid the warnings? Please do not suggest simply
omitting FileUtils
when I’m using rake (I guess the warning results from rake also
including FileUtils).
I don’t require them directly in the same module. Instead I have

require ‘rake’
require ‘SomeOtherModule’

in one file, and SomeOtherModule.rb happens to use FileUtils, and this
causes the
warnings in the end.

Ronald

Ronald F. wrote:

constant S_IF_DOOR
I don’t require them directly in the same module. Instead I have

require ‘rake’
require ‘SomeOtherModule’

in one file, and SomeOtherModule.rb happens to use FileUtils, and this
causes the
warnings in the end.

Ronald

Are you sure you don’t want to require ‘fileutils’ rather than
‘FileUtils’? The latter gives me errors while the former does not.
Actually, it looks to me like rake (or possibly rubygems) requires
fileutils anyway…

constant OPT_TABLE
[snip]

Are you sure you don’t want to require ‘fileutils’ rather than
‘FileUtils’?

Indeed, I needed to write it as ‘fileutils’ and the error disappears.

Now I wonder why I never got an error before in my application
(I had always required ‘FileUtils’ before, but got an error only
when I also started to use rake. It seems that Ruby had at least
included something when I asked for FileUtils…

Ronald F. wrote:

constant OPT_TABLE
when I also started to use rake. It seems that Ruby had at least
included something when I asked for FileUtils…

I think what’s happening here is a conflict between Ruby’s require
mechanism being case sensitive, and Windows’ pathnames not being case
sensitive. When you say ‘require “fileutils”’, Ruby remembers that it
has seen something called “fileutils” so that it can avoid loading the
same file twice. When you then ‘require “FileUtils”’ later, Ruby
doesn’t think it has seen it before, because it’s in a different case,
so it queries the filesystem. Because Windows doesn’t distinguish
between upper and lower case, it returns the same file as before, which
Ruby then tries to reload. The errors are thus from the same file being
loaded twice, but via two different names that resolve to the same file.

Ronald F. wrote:

constant OPT_TABLE
when I also started to use rake. It seems that Ruby had at least
included something when I asked for FileUtils…


Ronald F. [email protected]
Phone: +49-89-452133-162

The file to be required is /lib/ruby/1.8/fileutils.rb
which
implements the module FileUtils.

require ‘filetuils’ => correct, embeds fileutils.rb into current file
include FileUtils => correct, mixes in methods from FileUtils module
into
current class/module.

At least, thats how I learned it… I’m no Ruby professional so don’t
quote me.

TerryP.

sensitive.
You are right! I’m pretty sure that was it!

Thanks for the clarification.

Ronald

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