From: ara.t.howard@...
Date: 2006-07-26T05:57:45+09:00
Subject: Re: Ruby and *NIX environment variables

On Wed, 26 Jul 2006, Ben Zealley wrote:

>
> Erm, *puts on his newbie shirt* I don't seem to have the "session"
> package, maybe because this is one-click Ruby for Windows - is it
> included by default with the *nix version, or do I need to get it from
> somewhere? If the latter, where? I assume
> http://rubyforge.org/projects/session is the homepage, but there's
> nothing there...
>
> Cheers
>
> --
> Ben

it's *nix (or msys or cgywin) specific :

   gem install -r session

you don't need session btw.  this'll do it too:

     harp:~ > cat a.rb
     require 'yaml'
     require 'tempfile'

     def tmpfile txt = ''
       t = Tempfile.new rand.to_s
       t.write txt
       t.close
       t.path
     end

     values_sh = tmpfile %q(
       export KEY=VALUE
       export date=`date`
       export foo=bar
     )

     def propagate_env path
       cmds = <<-cmds
         echo __before__; ruby -r yaml -e'  y ENV.to_hash  '; echo __before__
         . #{ path }
         echo __after__; ruby -r yaml -e'  y ENV.to_hash  '; echo __after__
       cmds

       stdout =
         IO.popen('sh', 'w+') do |sh|
           sh.write cmds
           sh.close_write
           sh.read
         end

       raise "env failure from <#{ path }>" unless $?.exitstatus == 0

       before = YAML.load %r/__before__\s*(.*)\s*__before__/mio.match(stdout)[1]
       after = YAML.load %r/__after__\s*(.*)\s*__after__/mio.match(stdout)[1]
       updated = {}
       after.each do |k,v|
         updated[k] = v if before[k].nil? or before[k] != after[k]
       end
       ENV.update updated
       updated
     end

     propagate_env values_sh

     p ENV['date']
     p ENV['foo']


     harp:~ > ruby a.rb
     "Tue Jul 25 14:57:06 MDT 2006"
     "bar"


regards.


-a
-- 
suffering increases your inner strength.  also, the wishing for suffering
makes the suffering disappear.
- h.h. the 14th dali lama