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#!/usr/bin/env ruby

# Amazon Web Services EC2 Query API Ruby library
#
# Ruby Gem Name::  amazon-ec2
# Author::    Glenn Rempe  (mailto:glenn@rempe.us)
# Copyright:: Copyright (c) 2007-2010 Glenn Rempe
# License::   Distributes under the same terms as Ruby
# Home::      http://github.com/grempe/amazon-ec2/tree/master
#++

# CREDITS : Credit for this bit of shameful ripoff coolness
# goes to Marcel Molina and his AWS::S3 gem.  Thanks!

aws_lib   = File.dirname(__FILE__) + '/../lib/AWS'
setup = File.dirname(__FILE__) + '/setup'
irb_name = RUBY_PLATFORM =~ /mswin32/ ? 'irb.bat' : 'irb'

welcome_message = <<-MESSAGE

Usage :

This is an interactive Ruby 'irb' shell that allows you to use the
AWS commands available in the 'amazon-ec2' gem.  This can be a
great tool to help you debug issues and run commands
against the live AWS servers.  You can do anything in this
shell that you can in a normal irb shell.

Config :

You must set the following environment variables that contain your
AWS credentials in your system shell for this to work.

  AMAZON_ACCESS_KEY_ID
  AMAZON_SECRET_ACCESS_KEY

Each AWS service has its own default server endpoints. You can override
the endpoints with the following environment variables set in your
system shell:

  EC2 :                     EC2_URL
  Elastic Load Balancing :  ELB_URL
  AutoScaling :             AS_URL
  RDS :                     RDS_URL
  CloudWatch :              AWS_CLOUDWATCH_URL

For your convenience, the various AWS services are wired up in this shell
to the following class variables.  You can execute methods on each of these:

  @ec2   (Elastic Compute Cloud)
  @elb   (Elastic Load Balancing)
  @as    (AutoScaling)
  @rds   (Relational Database Service)
  @cw    (CloudWatch)

You can make method calls on these instances to execute commands against
the various services. Pre-pending a 'pp' should give you a pretty printed
version of the response which may be easier to read.

Examples:

  returns : Pretty Print all ec2 public methods
  >> pp @ec2.methods.sort

  returns : Pretty Print a Hash describing your EC2 images
  >> @ec2.describe_images(:owner_id => ['self'])

  returns : an Array of AWS::Response objects, each an EC2 image and its data
  >> @ec2.describe_images(:owner_id => ['self']).imagesSet.item
  >> @ec2.describe_images(:owner_id => ['self']).imagesSet.item[0]

MESSAGE

if ( ENV['AMAZON_ACCESS_KEY_ID'] && ENV['AMAZON_SECRET_ACCESS_KEY'] )
  puts welcome_message
  exec "#{irb_name} -rubygems -r #{aws_lib} -r #{setup} --simple-prompt"
else
  puts "You must define AMAZON_ACCESS_KEY_ID and AMAZON_SECRET_ACCESS_KEY as shell environment variables before running #{$0}!"
  puts welcome_message
end