Wait for a Rackspace cloud server to build

wait-rs-server.rb

#!/usr/bin/env ruby

require "fog"

hostname = ARGV.fetch(0)

compute = Fog::Compute.new(
  provider:           "Rackspace",
  rackspace_api_key:  ENV.fetch("RACKSPACE_API_KEY"),
  rackspace_username: ENV.fetch("RACKSPACE_USERNAME"),
  rackspace_region:   :lon
)

server = compute.servers.find { |s| s.name == hostname }

loop do
  server.reload

  if server.ready?
    puts "Server seems to be ready."

    5.times do
      print 7.chr
      sleep 0.5
    end

    exit 0
  else
    $stderr.puts "Server doesn't seem to be ready yet."
    sleep 10
  end
end