Puppet users - Aug 2014 - run script after something changed an env variable (PATH)

Using https://github.com/maestrodev/puppet-rvm, I have this code to install 
a gem I copied in /tmp/mailcatcher.gem

rvm_gem { 'mailcatcher':
  name => 'mailcatcher',
  source => '/tmp/mailcatcher.gem',
  ruby_version => 'ruby-1.9.3-p547',
  ensure => latest,
  require => [
    File['/tmp/mailcatcher.gem'], 
    Rvm_system_ruby['ruby-1.9.3-p547']
  ],
}


How can i run the installed gem script afterwards, with the new path set by 
ruby/rvm?
If i do this, it fails with "could not find command mailcatcher":

exec { 'start mailcatcher':
  command => "mailcatcher --http-ip=0.0.0.0",
  require => Rvm_gem['mailcatcher'],
}


I need something to refresh the env variables, or something to get the new 
installed gem path.

I could hardcode the new path since i know which version of ruby i've 
installed:

exec { 'start mailcatcher':
  command => "mailcatcher --http-ip=0.0.0.0",
  require => Rvm_gem['mailcatcher'],
  cwd => "/usr/local/rvm/ruby-1.9.3-p547/bin/"
}

..but there must be a better way

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