Ruby-on-rails – Rails 3: Passenger can’t find git gems installed by bundler

This is a known issue in Bundler. The workarounds are either:

• Generate a Gemfile.lock on a system similar enough to your production environment that you get results that match your production platform. Effectively, that means you can only generate the Gemfile.lock file on Windows if your production system is Windows.
• Don't commit a Gemfile.lock file at all, and determine dependencies on the production machine at deploy time (bundle install without --deploy). While not recommended in general, this is an often-used workaround until the bug is fixed. For example, this is the recommended solution offered by Heroku.
• Switch to JRuby, which would have the same platform string across both Windows and Linux (java). I don't recommend this seriously, but I believe it would fix the problem.
• Fix the problem in the Bundler source code, i.e., help the Bundler team fix the bug. :)

You need to instruct Passenger to load RVM and then setup the environment for your gemset. The easiest way to go about this involves three steps:

1. Create a .rvmrc file: In the root of your rails project, create a file called .rvmrc that contains the RVM command you would use to load up your gemset. For example:

   rvm use ree@gemset
   

2. Trust the .rvmrc file: Once you've deployed your new .rvmrc file to your server, change directories into your rails project. RVM should ask you if you want to trust your .rvmrc file; simply follow the instructions and type yes when asked. If the prompt does not appear, use the following command to trust your .rvmrc:

   rvm rvmrc trust
   

   Note: If you wish to automatically trust all .rvmrcs, it is a simple matter of adding:

   rvm_trust_rvmrcs_flag=1
   

   to your personal or system wide rvmrc (~/.rvmrc and /etc/rvmrc, respectively).

3. Instruct passenger to set up the RVM environment: Instruct passenger to load up RVM and use the gemset in your .rvmrc file by creating a new file in your Rails config directory called setup_load_paths.rb (so config/setup_load_paths.rb in all). The file should contain the contents of https://gist.github.com/870310:

   if ENV['MY_RUBY_HOME'] && ENV['MY_RUBY_HOME'].include?('rvm')
     begin
       rvm_path     = File.dirname(File.dirname(ENV['MY_RUBY_HOME']))
       rvm_lib_path = File.join(rvm_path, 'lib')
       $LOAD_PATH.unshift rvm_lib_path
       require 'rvm'
       RVM.use_from_path! File.dirname(File.dirname(__FILE__))
     rescue LoadError
       raise "RVM ruby lib is currently unavailable."
     end
   end
   
   # This assumes Bundler 1.0+
   ENV['BUNDLE_GEMFILE'] = File.expand_path('../Gemfile', File.dirname(__FILE__))
   require 'bundler/setup'
   

   Now when you restart your app (touch tmp/restart.txt) you should be good to go.

You should note that Passenger can only run one version of Ruby at a time; if Passenger was set up under something other than ree, you will probably have to reinstall Passenger and/or redo the wrapper script it generates.