From: "Ara.T.Howard" <Ara.T.Howard@...>
Date: 2005-10-27T08:52:33+09:00
Subject: [GEM PATCH] allow gem to install bin file to different location


SYNOPSIS

   this patch allows any value in Config::CONFIG to be altered from the
   command line when using gem.  by altering a value, for example bindir, fine
   grained control can be affected during the installation proccess.  here is the
   patch:


PATCH


   jib:~ > diff -u gem.org gem
   --- gem.org 2005-10-26 14:51:53.000000000 -0600
   +++ gem     2005-10-26 17:44:31.000000000 -0600
   @@ -14,4 +14,16 @@
    # it...its for the source building process.
    args = !ARGV.include?("--") ? ARGV.clone : ARGV[0...ARGV.index("--")]

   +#
   +# munge rbconfig from any command line or environment kv pair
   +#
   +kvs = []
   +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)


EXAMPLE USAGE

   jib:~ > which rake
   which: no rake in ...

   jib: > ruby -r rbconfig -e'p Config::CONFIG["bindir"]'
   "/dmsp/reference/ruby-1.8.1//bin"

   jib: > gem install bindir=/dmsp/reference/bin rake
   Attempting local installation of 'rake'
   Local gem file not found: rake*.gem
   Attempting remote installation of 'rake'
   Successfully installed rake-0.6.2
   Installing RDoc documentation for rake-0.6.2...

   jib: > which rake
   /dmsp/reference/bin/rake


so anything value in Config::CONFIG can be replaced on the command line.
configuration via the environment is also supported.  so i could have done the
above via

   jib: > export GEM_bindir=/dmsp/reference/bin
   jib: > gem install rake

any env var starting with 'GEM_' is taken to be a key/val pair for
Config::CONFIG.

thoughts?


-a
-- 
===============================================================================
| email :: ara [dot] t [dot] howard [at] noaa [dot] gov
| phone :: 303.497.6469
| anything that contradicts experience and logic should be abandoned.
| -- h.h. the 14th dalai lama
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