Generate changes by commits included in current TeamCity build

changes.rb

require 'net/http'
require 'json'

def get_json(uri)
  url = URI.parse(uri)
  req = Net::HTTP::Get.new(url, {'Accept' => "application/json"})
  res = Net::HTTP.start(url.host, url.port) {|http|
    http.request(req)
  }

  JSON.parse(res.body)
end

def main
  prefix = ARGV[1]

  if !ARGV[0]
    raise "You must pass the build_id as argument"
    return 1

  end

  build_id = ARGV[0]
  changes = get_json("#{prefix}/httpAuth/app/rest/changes?build=id:#{build_id}")["change"]

  if !changes
    puts "nothing changed here"
    return 0
  end

  for c in changes
    change_id = c["id"]
    change_det = get_json("#{prefix}/httpAuth/app/rest/changes/id:#{change_id}")

    puts change_det["comment"]
  end

end

main()

run.sh

ruby changes.rb %teamcity.build.id% http://my_teamcity_server_url > changes.txt

Using Powershell https://gist.github.com/jincod/03ed02181c83faf93081