From: Jim Weirich <jim@...>
Date: 2005-12-10T03:53:13+09:00
Subject: Re: home of the gems?

railsinator wrote:
> Thanks for getting back to me Jim. Please bear with me as I try to
> understand how this works.
> 
> If I do "gem env" I get a stack trace:
> 
> kfelkins@lurch:~/bin$ gem env
> /usr/local/lib/site_ruby/1.8/rubygems.rb:194:in `report_activate_error':
> Could not find RubyGem sources (> 0.0.0) (Gem::LoadError)
>     from /usr/local/lib/site_ruby/1.8/rubygems.rb:136:in `activate'
>     from /usr/local/lib/site_ruby/1.8/rubygems.rb:37:in
> `require_gem_with_options'
>     from /usr/local/lib/site_ruby/1.8/rubygems.rb:31:in `require_gem'
>     from 
> /usr/local/lib/site_ruby/1.8/rubygems/remote_installer.rb:403:in
> `sources'
>     from /usr/local/lib/site_ruby/1.8/rubygems/gem_commands.rb:897:in
> `execute'
>     from /usr/local/lib/site_ruby/1.8/rubygems/command.rb:49:in `invoke'
>     from /usr/local/lib/site_ruby/1.8/rubygems/cmd_manager.rb:92:in
> `process_args'
>     from /usr/local/lib/site_ruby/1.8/rubygems/cmd_manager.rb:65:in 
> `run'
>     from /usr/local/lib/site_ruby/1.8/rubygems/gem_runner.rb:9:in `run'
>     from /home/kfelkins/bin/gem:17
> kfelkins@lurch:~/bin$
> 
> Still, my rails app will run when I start it with script/server.
> 
> So clearly there are a set of gems installed somewhere. These were 
> likely
> installed via the debian package management system. So how are gems 
> found?
> 
> kfelkins@lurch:~/bin$ echo $GEM_HOME
> /home/kfelkins/gem-repository
> kfelkins@lurch:~/bin$ ls -l $GEM_HOME
> total 16
> drwxrwxr-x  2 kfelkins genome 4096 2005-12-08 17:15 cache
> drwxrwxr-x  2 kfelkins genome 4096 2005-12-08 17:15 doc
> drwxrwxr-x  2 kfelkins genome 4096 2005-12-08 17:15 gems
> drwxrwxr-x  2 kfelkins genome 4096 2005-12-08 17:15 specifications
> kfelkins@lurch:~/bin$ cd $GEM_HOME/gems
> kfelkins@lurch:~/gem-repository/gems$ ls
> kfelkins@lurch:~/gem-repository/gems$ echo $GEM_PATH
>  kfelkins@lurch:~/gem-repository/gems$

Ok, it looks like you no longer have the system gem repository in your 
GEM_PATH.  Gem can't find its sources gem.

Try adding the original repository to the GEM_PATH.  Perhaps something 
like this:

   export GEM_PATH=/usr/local/lib/ruby/gems/1.8

(you might need to tweek the directory for your local system).

Once you add that line, gems should search both your $GEM_HOME 
repository and the GEM_PATH repository.  You can add more repositories 
to GEM_PATH if you wish.

-- Jim Weirich

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