gems_install.rb

#!/usr/bin/env ruby

# Author: Vitalie L
# Simple replacer to bundler gem
# Sample config file
=begin
rails,2.2.3
rcov
rdiscount
uuidtools,1.0.7
reliable-msg,1.1.2,http://www.example.com/download/reliable-msg-1.1.2.gem
=end

require 'rubygems'

#------------------------------------------
def install_one_gem(gem_name, version, url)
  gi="gem install --no-ri --no-rdoc"

  begin
    if version
      gem gem_name, version
    else
      gem gem_name
    end

    puts "#{gem_name} #{version} is installed"
  rescue Gem::LoadError => e
    #p e

    if url
      glocal_path = "/tmp/#{gem_name}.gem"

      if system "wget '#{url}' -O #{glocal_path} -o /dev/null"
        cmd = "#{gi} #{glocal_path}"
      else
        puts "can not download gem from #{url}"
        return false
      end
    else
      extra = version ? "-v #{version}" : ""
      cmd = "#{gi} #{extra} #{gem_name}"
    end

    begin
      puts cmd
      rez = system(cmd)
      return false if ! rez
    rescue
      return false
    end

  end

  return true
end


#------------------------------------------
# Main program
gems = File.open(File.join(File.dirname(__FILE__), 'gems_config.txt')) {|f| f.read}

gems.each_line do |l|
  l.chomp!
  gem_name, version, url = l.split(',', 3)

  3.times do |i|
    rc = install_one_gem(gem_name, version, url)
    if rc
      break
    else
      exit 1 if i >= 2
      sleep(10)
    end
  end
end