# File lib/fpm/source/gem.rb, line 28
  def get_source(params)
    gem = @paths.first
    looks_like_name_re = /^[A-Za-z0-9_-]+$/
    if !File.exists?(gem)
      if gem =~ looks_like_name_re
        download(gem, params[:version])
      else
        raise "Path '#{gem}' is not a file and does not appear to be the name of a rubygem."
      end
    end
  end