You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: php.rb
    path of file: ./repos/travis-build/lib/travis/build/script
    
    the code of the file until where you have to start completion: module Travis
  module Build
    
    
        def composer_self_update
          unless version =~ /^5\.2/
            sh.if '-n $(composer --version | grep -o "version [^ ]*1\\.0-dev")' do
              sh.cmd "composer self-update 1.0.0", assert: false
            end
            sh.cmd "composer self-update", assert: false
          end