r10k_deployment.rb

#!/usr/bin/ruby

require 'webrick'
require 'json'

req = WEBrick::HTTPRequest.new(WEBrick::Config::HTTP)
req.parse(STDIN)

json_payload = JSON.parse(req.query['payload'])
branch = json_payload['ref'].split('/')[-1]

pid = fork
if pid.nil? then
  STDIN.reopen "/dev/null"
  STDOUT.reopen "/dev/null", "a"
  STDERR.reopen "/dev/null", "a"

  exec('/usr/local/bin/r10k', 'deploy', 'environment', branch, '-p')
end

Process.detach(pid)