From: Kelly Dwight Felkins <railsinator@...>
Date: 2005-12-10T03:03:33+09:00
Subject: Re: home of the gems?

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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 $GEM_PATH
 kfelkins@lurch:~/gem-repository/gems$

Thanks again.

-Kelly


On 12/8/05, Jim Weirich <jim@weirichhouse.org> wrote:
>
> railsinator wrote:
> > I'm trying to understand how gems are loaded. Please help.
> >
> > A little background:
> >
> > I decided to do some rails development work on a debian system. I didn'=
t
> > think rails was up to date, so I tried to do a 'gem update rails'. This
> > failed because I did not have root access. So I installed the gems
> > locally.
> > Everthing seemed fine.
> >
> > I later deleted the local gem directory. Now:
> >
> >    - "gem list" says there are no gems.
> >    - "gemwhich rails" says "can't find rails.
> >    - The application runs fine.
> >
> > By now it is clear to me that there are gems installed in the default
> > location. I would like to override this with a local install. I don't
> > understand how the load path is determined.
> >
> > Thanks for your help.
>
> 'gem env' will give you some information about your gem environment.
> You can control the details here via environment variables:
>
>    GEM_HOME -- Path to gem repository where gems are installed by
> default.
>    GEM_PATH -- List of paths of gem repositories to be searched.
>
> -- Jim Weirich
>
>
> --
> Posted via http://www.ruby-forum.com/.
>
>

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