Bagaimana cara menghentikan layanan di Travis CI yang berjalan secara default?

Ternyata dengan menggunakan /etc/init.d/ ... bekerja lebih dapat diandalkan. Ada beberapa peringatan bahwa seseorang harus menggunakan sudo service ... tapi saya tidak berhasil dengan itu. Jadi inilah yang saya jalankan sekarang:

language: android

jdk:
  - oraclejdk7
  - openjdk7

android:
  components:

    # All the build system components should be at the latest version
    - tools
    - platform-tools
    - build-tools-21.1.1
    - android-19

    # The libraries we can't get from Maven Central or similar
    - extra-android-support


notifications:
  email: true

before_script:

  # Disable services enabled by default
  # http://docs.travis-ci.com/user/database-setup/#MySQL
  - sudo /etc/init.d/mysql stop
  - sudo /etc/init.d/postgresql stop
  # The following did not work reliable
  # - sudo service mysql stop
  # - sudo service postgresql stop

  # Ensure Gradle wrapper is executable
  - chmod +x gradlew

  # Ensure signing configuration is present
  - mv app/gradle.properties.example app/gradle.properties

script:
  - ./gradlew clean assembleDebug