reset_build_numbers.rb

# Simple Ruby script to reset TeamCity build numbers

USER_DIR = ENV['USERPROFILE'].gsub('\\', '/')

# If the .BuildServer directory for TeamCity is located elsewhere on your machine, change this constant to match
TC_BUILDSERVER_CONFIG = File.join(USER_DIR, '.BuildServer', 'config', '**', '*.buildNumbers.properties')

Dir.glob(TC_BUILDSERVER_CONFIG).each do |file|
  buffer = File.new(file, 'r').read.gsub(/next.build=\d+/, 'next.build=1')
  File.open(file, 'w') { |f| f.write(buffer) }
end