Can "gem install" be configured to install executables outside /usr/bin/ by default?

Question

By default, when you sudo gem install thegemname it will install executables into /usr/bin/

Is there a way to change this? For example, to install them into /usr/local/rubygems/bin (or any other path)?

The path doesn't seem to be hard-coded into the gemspec file, so I don't see why this shouldn't be possible (although I have very little experience with Ruby/Gems)

Answer 1

See http://www.rubygems.org/read/chapter/11 and specify a ~/.gemrc which defines a gemhome variable.

For example:

gemhome: /usr/local/rubygems

You can also place this file in /etc/gemrc

Answer 2

On OS X, the executable directory is overridden to /usr/bin in the file /Library/Ruby/Site/1.8/rubygems/defaults.rb

# The default directory for binaries
def self.default_bindir
  if defined? RUBY_FRAMEWORK_VERSION then # mac framework support
    '/usr/bin'
  else # generic install
    ConfigMap[:bindir]
  end
end

As a hackish work around, I changed /usr/bin to my desired bin location, which works correctly. There doesn't seem to be any way to override bindir from the ~/.gemrc config?

Answer 3

I'm adding this as an answer so that it is obvious when I run into this problem again :)

First *, move all the bins in /var/lib/gems/1.8/bin/ to /usr/bin/.

Next, edit ~/.gemrc and add (or update) the following line:

gem: --bindir /usr/bin

This overrides gem so that it always uses /usr/bin/ as the bin dir.

No need to update the path (especially messy for multiple-user machines).

* If you don't do this, then uninstalling or updating a gem will not remove the binary from the original bin directory.

Updated: if you delete the old bin directory, make sure to remove it from the path.