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Edit: /opt/alt/ruby19/lib64/ruby/1.9.1/rubygems/commands/sources_command.rb

require 'rubygems/command'
require 'rubygems/remote_fetcher'
require 'rubygems/spec_fetcher'
require 'rubygems/local_remote_options'

class Gem::Commands::SourcesCommand < Gem::Command

include Gem::LocalRemoteOptions

def initialize
    require 'fileutils'

super 'sources',
          'Manage the sources and cache file RubyGems uses to search for gems'

add_option '-a', '--add SOURCE_URI', 'Add source' do |value, options|
      options[:add] = value
    end

add_option '-l', '--list', 'List sources' do |value, options|
      options[:list] = value
    end

add_option '-r', '--remove SOURCE_URI', 'Remove source' do |value, options|
      options[:remove] = value
    end

add_option '-c', '--clear-all',
               'Remove all sources (clear the cache)' do |value, options|
      options[:clear_all] = value
    end

add_option '-u', '--update', 'Update source cache' do |value, options|
      options[:update] = value
    end

add_proxy_option
  end

def defaults_str
    '--list'
  end

def execute
    options[:list] = !(options[:add] ||
                       options[:clear_all] ||
                       options[:remove] ||
                       options[:update])

if options[:clear_all] then
      path = Gem::SpecFetcher.fetcher.dir
      FileUtils.rm_rf path

unless File.exist? path then
        say "*** Removed specs cache ***"
      else
        unless File.writable? path then
          say "*** Unable to remove source cache (write protected) ***"
        else
          say "*** Unable to remove source cache ***"
        end

terminate_interaction 1
      end
    end

if options[:add] then
      source_uri = options[:add]
      uri = URI.parse source_uri

begin
        Gem::SpecFetcher.fetcher.load_specs uri, 'specs'
        Gem.sources << source_uri
        Gem.configuration.write

say "#{source_uri} added to sources"
      rescue URI::Error, ArgumentError
        say "#{source_uri} is not a URI"
        terminate_interaction 1
      rescue Gem::RemoteFetcher::FetchError => e
        say "Error fetching #{source_uri}:\n\t#{e.message}"
        terminate_interaction 1
      end
    end

if options[:remove] then
      source_uri = options[:remove]

unless Gem.sources.include? source_uri then
        say "source #{source_uri} not present in cache"
      else
        Gem.sources.delete source_uri
        Gem.configuration.write

say "#{source_uri} removed from sources"
      end
    end

if options[:update] then
      fetcher = Gem::SpecFetcher.fetcher

Gem.sources.each do |update_uri|
        update_uri = URI.parse update_uri
        fetcher.load_specs update_uri, 'specs'
        fetcher.load_specs update_uri, 'latest_specs'
      end

say "source cache successfully updated"
    end

if options[:list] then
      say "*** CURRENT SOURCES ***"
      say

Gem.sources.each do |source|
        say source
      end
    end
  end

private

def remove_cache_file(desc, path)
    FileUtils.rm_rf path

if not File.exist?(path) then
      say "*** Removed #{desc} source cache ***"
    elsif not File.writable?(path) then
      say "*** Unable to remove #{desc} source cache (write protected) ***"
    else
      say "*** Unable to remove #{desc} source cache ***"
    end
  end

end

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