From: ara.t.howard@...
Date: 2006-02-17T00:48:27+09:00
Subject: Re: rubygems and Config::CONFIG

On Thu, 16 Feb 2006, George Ogata wrote:

> Hello,
>
> I have two versions of ruby installed, rooted at different source
> trees.  In order to make them not collide in my $PATH, I simply
> configured one with a program-suffix:
>
> EPREFIX1/bin/ruby
> EPREFIX2/bin/ruby18
>
> Life was peachy until I installed rubygems.  The gems executables all
> go in the ruby bindirs (alongside ruby and ruby18), but they ignore
> any --program-prefix or --program-suffix.  Would it not be a good idea
> to have the executables named with the same prefix and suffix as the
> ruby executable?  I think the shebang lines should also be rewritten
> to use the full path to the ruby executable used to run setup.rb.
>
> Of course, this would make it impossible to move the ruby executable
> without breaking gems, but I'd kinda expect a few things may break if
> you were to pull a stunt like that.
>
> Now, there's no Config::CONFIG['program_suffix'] (or prefix), so it'd
> probably be an idea to add these too.  But they can also be sucked out
> of Config::CONFIG['configure_args'] with Shellwords easily.
>
> What do you think?

i have exactly the same issue here at work and i'm working with chad and jim to
get something like this into rubygems now:

(gem script)

     #!/usr/bin/env ruby

     require 'rubygems'
     Gem.manage_gems

     required_version = Gem::Version::Requirement.new(">= 1.8.0")
     unless  required_version.satisfied_by?(Gem::Version.new(RUBY_VERSION))
       puts "Expected Ruby Version #{required_version}, was #{RUBY_VERSION}"
       exit(1)
     end

     # We need to preserve the original ARGV to use for passing gem options
     # to source gems.  If there is a -- in the line, strip all options after
     # it...its for the source building process.
     args = !ARGV.include?("--") ? ARGV.clone : ARGV[0...ARGV.index("--")]


     # allow env vars of GEM_xxx or command lines args of k=v to supercede any
     # Config::CONFIG values kvs = []
     #
     # this allows commands like
     #
     #   GEM_bindir=/usr/local/bin gem install arrayfields
     #
     # or
     #
     #   gem install arrayfields bindir=/usr/local/bin
     #
     # note that any and all Config::CONFIG values may be tweaked for fine
     # grained control of install process.
     #
     re = %r/^ \s* ([^=\s]+) \s* = \s* ([^\s]+) \s* $/x
     args.delete_if{|arg| (m = re.match(arg)) and (kvs << m.to_a.last(2))}
     ENV::each{|k,v| (k =~ %r/^GEM_/) and (kvs << [k.delete('GEM_'), v])}
     unless kvs.empty?
       require 'rbconfig'
       kvs.each{|k,v| Config::CONFIG[k] = v}
     end

     Gem::GemRunner.new.run(args)



please try this out and let me know how it works for you.

kind regards.

-a

-- 
judge your success by what you had to give up in order to get it.
- h.h. the 14th dali lama