ree_gem_reinstall.rb

#!/opt/ree/bin/ruby
# originally from http://griffin.oobleyboo.com/archive/ruby-enterprise-edition-gem-install-script/
#
# Usage:
#
#   $ sudo -s
#   # OLD_GEM=/usr/bin/gem NEW_GEM=/opt/ree-whatever/bin/gem /opt/ree/bin/ruby ree_gem_reinstall.rb

# The command to run for your vanila Ruby 'gem' command
ENV['OLD_GEM'] ||= '/usr/bin/gem'
# The command to run for REE's 'gem' command
ENV['NEW_GEM'] ||= '/opt/ree/bin/gem'

output=`#{ENV['OLD_GEM']} list`
new_list=`#{ENV['NEW_GEM']} list`
output.each do |line|
  # Skip lines that don't look like a gem version
  matches=line.match(/([A-Z].+) \(([0-9\., ]+)\)/i)
  if matches then
    gem_name=matches[1]
    # skip passenger and mysql
    next if gem_name == 'mysql' || gem_name == 'passenger'
    versions=matches[2]
    versions.split(', ').each do |ver|
      cmd="#{ENV['NEW_GEM']} install #{gem_name} -v #{ver} --no-rdoc --no-ri --backtrace" 
      # See if this gem is already installed
      if new_list =~ /#{gem_name} \(.*#{ver}.*\)/i then
        puts "#{gem_name} #{ver} is already installed. Skipping" 
      else
        puts cmd
        system(cmd)
      end
    end
  end
end
#install mysql
cmd = "#{ENV['NEW_GEM']} install mysql -- --with-mysql-config"
puts cmd
system(cmd)
puts "Done!"