bundle exec fails when called from an init.d script

I am trying to set up my server to use chruby to manage rubies and have unicorn started from a rails app bundle.

service unicorn start works fine from a shell. /etc/init.d/unicorn is calling a chruby wrapper for unicorn that calls bundle exec unicorn.

During the init process, bundle exec fails unable to “re-resolve” dependencies before running unicorn. It appears that it can’t contact the gem sources to resolve things.

Can this be disabled or worked around somehow?

The message is:

Found changes from the lockfile, re-resolving dependencies because bundler is unlocking Could not find gem ‘blah’ in any of the gem sources listed in your Gemfile.

Any pointers would be greatly appreciated. Thanks.