anchor.diff:  
   RUN echo "deb https://packages.cloud.google.com/apt cloud-sdk-`lsb_release -c -s` main" | sudo tee -a /etc/apt/sources.list.d/google-cloud-sdk.list
   RUN curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
  -RUN sudo apt-get update -qq
  -RUN sudo apt-get install -y -qq google-cloud-sdk
  +RUN sudo apt-get update -qq \
  + && sudo apt-get install -y -qq google-cloud-sdk
   
   ENV GCLOUD_SDK_CONFIG /usr/lib/google-cloud-sdk/lib/googlecloudsdk/core/config.json
   
  
positive.code: 
  # SDKs
  # Please keep these in descending order!
  RUN sdkmanager "platforms;android-26"
  RUN sdkmanager "platforms;android-25"
  RUN sdkmanager "platforms;android-24"
  RUN sdkmanager "platforms;android-23"
  RUN sdkmanager "platforms;android-22"
  RUN sdkmanager "platforms;android-21"
  RUN sdkmanager "platforms;android-20"
  RUN sdkmanager "platforms;android-19"
  RUN sdkmanager "platforms;android-17"
  RUN sdkmanager "platforms;android-15"
  RUN sdkmanager "platforms;android-10"
  
  # build tools
  # Please keep these in descending order!
  RUN sdkmanager "build-tools;26.0.1"
  RUN sdkmanager "build-tools;26.0.0"
  RUN sdkmanager "build-tools;25.0.3"
  RUN sdkmanager "build-tools;25.0.2"
  RUN sdkmanager "build-tools;24.0.3"
  RUN sdkmanager "build-tools;23.0.3"
  RUN sdkmanager "build-tools;22.0.1"
  RUN sdkmanager "build-tools;21.1.2"
  RUN sdkmanager "build-tools;20.0.0"
  RUN sdkmanager "build-tools;19.1.0"
  RUN sdkmanager "build-tools;17.0.0"
  
  # Android System Images, for emulators
  # Please keep these in descending order!
  RUN sdkmanager "system-images;android-25;google_apis;armeabi-v7a"
  RUN sdkmanager "system-images;android-24;default;armeabi-v7a"
  RUN sdkmanager "system-images;android-22;default;armeabi-v7a"
  RUN sdkmanager "system-images;android-21;default;armeabi-v7a"
  RUN sdkmanager "system-images;android-19;default;armeabi-v7a"
  RUN sdkmanager "system-images;android-17;default;armeabi-v7a"
  RUN sdkmanager "system-images;android-15;default;armeabi-v7a"
  
  # Extras
  RUN sdkmanager "extras;android;m2repository"
  RUN sdkmanager "extras;google;m2repository"
  RUN sdkmanager "extras;google;google_play_services"
  
  # Constraint Layout
  # Please keep these in descending order!
  RUN sdkmanager "extras;m2repository;com;android;support;constraint;constraint-layout;1.0.2"
  RUN sdkmanager "extras;m2repository;com;android;support;constraint;constraint-layout;1.0.1"
  
  # google apis
  # Please keep these in descending order!
  RUN sdkmanager "add-ons;addon-google_apis-google-23"
  RUN sdkmanager "add-ons;addon-google_apis-google-22"
  RUN sdkmanager "add-ons;addon-google_apis-google-21"
  
  # ------------------------------------------------------
  # --- Install Gradle from PPA
  
  # Gradle PPA
  RUN apt-get update
  RUN apt-get -y install gradle
  RUN gradle -v
  
  # ------------------------------------------------------
  # --- Install Maven 3 from PPA
  
  RUN apt-get purge maven maven2
  RUN apt-get update
  RUN apt-get -y install maven
  RUN mvn --version
  
  
  # ------------------------------------------------------
  
negative.code: # ------------------------------------------------------
  # --- Install Fastlane
  
  RUN gem install fastlane --no-document \
   && fastlane --version
  
  # ------------------------------------------------------
  # --- Install Google Cloud SDK
  