Reuse gems from previous version #154

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1. RSpace commented on Jan 3, 2019

   

   RSpace

   on Jan 3, 2019

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   +1
2. leomao10 commented on Sep 8, 2020

   

   leomao10

   on Sep 8, 2020

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   I can do it via cloud build by adding following docker file in my repo as ruby-base.dockerfile:

   # This file is generated base on generate-dockerfile from follow repo:
   # https://github.com/GoogleCloudPlatform/ruby-docker/tree/master/ruby-generate-dockerfile
   
   ARG ruby_version=2.6.4
   ARG prebuilt_image=gcr.io/gcp-runtimes/ruby/ubuntu16/prebuilt/ruby-2.6.4:latest
   FROM $prebuilt_image as prebuilt-ruby
   
   FROM gcr.io/gcp-runtimes/ruby/ubuntu16:latest AS augmented-base
   ARG ruby_version=2.6.4
   ARG bundler_version=2.0.2
   ARG rails_env=production
   
   ## Commonly installed gems (e.g. bundler) are available from this image.
   COPY --from=gcr.io/gcp-runtimes/ruby/ubuntu16/build-tools:latest /opt/gems/ /opt/gems/
   
   ## Install Ruby ${ruby_version} from a prebuilt image. If a prebuilt image
   ## is not available, use the alternate installation method commented below.
   COPY --from=prebuilt-ruby \
        /opt/rbenv/versions/${ruby_version} \
        /opt/rbenv/versions/${ruby_version}
   
   RUN echo "This is the ruby version ${ruby_version}"
   RUN rbenv global $ruby_version \
       && rbenv rehash \
       && (gem install /opt/gems/bundler-${bundler_version}.gem ; \
           rbenv rehash);
   
   ## Alternate installation for Ruby versions that have no prebuilt image.
   # RUN if [ ! -x ${RBENV_ROOT}/versions/${ruby_version}/bin/ruby ]; \
   #     then \
   #       cd ${RBENV_ROOT}/plugins/ruby-build \
   #         && git pull \
   #         && rbenv install -s ${ruby_version} \
   #         && rbenv global ${ruby_version} \
   #         && rbenv rehash \
   #         && (gem install /opt/gems/bundler-${bundler_version}.gem ; \
   #             rbenv rehash); \
   #     fi
   
   COPY ./Gemfile /app/
   COPY ./Gemfile.lock /app/
   
   RUN bundle install --deployment && rbenv rehash
   
   ENTRYPOINT []

   Then in cloudbuild.yml file, I added this step:

     - name: 'gcr.io/cloud-builders/docker'
       id: preinstall-gems
       entrypoint: 'bash'
       args:
         - '-c'
         - |
           docker build -t gcr.io/${PROJECT_ID}/ruby-base/${COMMIT_SHA} \
             --file ruby-base.dockerfile \
             --build-arg ruby_version=$(cat .ruby-version) \
             --build-arg prebuilt_image=gcr.io/gcp-runtimes/ruby/ubuntu16/prebuilt/ruby-$(cat .ruby-version):latest \
             .
           docker push gcr.io/${PROJECT_ID}/ruby-base/${COMMIT_SHA}
     
     # Generate dockerfile for app engine
     - name: 'gcr.io/gcp-runtimes/ruby/ubuntu16/generate-dockerfile'
       id: generate-dockerfile
       env: [
         'PROJECT_ID=${PROJECT_ID}'
       ]
       args: [
           '--base-image','gcr.io/${PROJECT_ID}/ruby-base/${COMMIT_SHA}:latest',
           '--build-tools-image', 'gcr.io/gcp-runtimes/ruby/ubuntu16/build-tools:latest'
         ]
   
     # Build docker image for app engine
     - name: 'gcr.io/cloud-builders/gcloud'
       id: deploy-appengine
       entrypoint: /bin/bash
       args:
         - '-c'
         - |
           gcloud config set app/cloud_build_timeout 1200
           gcloud app deploy ./app.yaml ${_TRAFFIC}
       waitFor: ['generate-dockerfile', 'preinstall-gems']
       timeout: 1200s
   timeout: 1200s
3. leomao10 commented on Sep 8, 2020

   

   leomao10

   on Sep 8, 2020

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   But of course, we still reinstall the gems when Gemfile.lock is not changed. Might need to take idea from this blogpost for yarn cache:
   https://medium.com/hackernoon/using-yarn-with-docker-c116ad289d56