Improve caching of webdrivers during qa-image build

.rubocop.yml

@@ -123,6 +123,7 @@ Naming/FileName:
     - 'ee/lib/generators/**/*'
     - 'qa/qa/scenario/test/integration/ldap_no_tls.rb'
     - 'qa/qa/scenario/test/integration/ldap_tls.rb'
+    - 'qa/tasks/*'
 
   IgnoreExecutableScripts: true
   AllowedAcronyms:

qa/Dockerfile

@@ -4,11 +4,6 @@ LABEL maintainer="GitLab Quality Department <quality@gitlab.com>"
 ENV DEBIAN_FRONTEND="noninteractive"
 ENV DOCKER_VERSION="17.09.0-ce"
 
-# https://s3.amazonaws.com/gitlab-google-chrome-stable
-ENV CHROME_VERSION="91.0.4472.77-1"
-ENV CHROME_DEB="google-chrome-stable_${CHROME_VERSION}_amd64.deb"
-ENV CHROME_URL="https://s3.amazonaws.com/gitlab-google-chrome-stable/${CHROME_DEB}"
-
 ##
 # Update APT sources and install dependencies
 #
@@ -22,15 +17,6 @@ RUN wget -q "https://download.docker.com/linux/static/stable/x86_64/docker-${DOC
     tar -zxf "docker-${DOCKER_VERSION}.tgz" && mv docker/docker /usr/local/bin/docker && \
     rm "docker-${DOCKER_VERSION}.tgz"
 
-##
-# Install Google Chrome version with headless support
-# Download from our local S3 bucket, populated by https://gitlab.com/gitlab-org/gitlab-build-images/-/blob/master/scripts/cache-google-chrome
-#
-RUN curl --silent --show-error --fail -O "${CHROME_URL}" && \
-    dpkg -i "./${CHROME_DEB}" || true && \
-    apt-get install -f -y && \
-    rm -f "./${CHROME_DEB}"
-
 ##
 # Install client certificate - Bug in Chrome Headless: https://gitlab.com/gitlab-org/gitlab/-/issues/331492
 #
@@ -60,9 +46,32 @@ RUN export CLOUD_SDK_REPO="cloud-sdk-$(lsb_release -c -s)" && \
     curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - && \
     apt-get update -y && apt-get install google-cloud-sdk kubectl -y
 
+##
+# Install Google Chrome version with headless support
+# Download from our local S3 bucket, populated by https://gitlab.com/gitlab-org/gitlab-build-images/-/blob/master/scripts/cache-google-chrome
+#
+# https://s3.amazonaws.com/gitlab-google-chrome-stable
+ENV CHROME_VERSION="91.0.4472.77-1"
+ENV CHROME_DEB="google-chrome-stable_${CHROME_VERSION}_amd64.deb"
+ENV CHROME_URL="https://s3.amazonaws.com/gitlab-google-chrome-stable/${CHROME_DEB}"
+RUN curl --silent --show-error --fail -O "${CHROME_URL}" && \
+    dpkg -i "./${CHROME_DEB}" || true && \
+    apt-get install -f -y && \
+    rm -f "./${CHROME_DEB}"
+
 WORKDIR /home/gitlab/qa
 
+# Install qa dependencies or fetch from cache if unchanged
 COPY ./qa/Gemfile* /home/gitlab/qa/
+RUN bundle install --jobs=$(nproc) --retry=3 --without=development --quiet
+
+##
+# Fetch chromedriver based on version of chrome
+# Copy rakefile first so that webdriver is not reinstalled on every code change
+# https://github.com/titusfortner/webdrivers
+COPY ./qa/tasks/webdrivers.rake /home/gitlab/qa/tasks/
+RUN bundle exec rake -f tasks/webdrivers.rake webdrivers:chromedriver:update
+
 COPY ./config/initializers/0_inject_enterprise_edition_module.rb /home/gitlab/config/initializers/
 # Copy VERSION to ensure the COPY succeeds to copy at least one file since ee/app/models/license.rb isn't present in FOSS
 # The [b] part makes ./ee/app/models/license.r[b] a pattern that is allowed to return no files (which is the case in FOSS)
@@ -71,12 +80,6 @@ COPY ./lib/gitlab.rb /home/gitlab/lib/
 COPY ./lib/gitlab/utils.rb /home/gitlab/lib/gitlab/
 COPY ./INSTALLATION_TYPE ./VERSION /home/gitlab/
 
-RUN bundle install --jobs=$(nproc) --retry=3 --without=development --quiet
-
 COPY ./qa /home/gitlab/qa
 
-# Fetch chromedriver version based on version of chrome
-# https://github.com/titusfortner/webdrivers
-RUN bundle exec rake webdrivers:chromedriver:update
-
 ENTRYPOINT ["bin/test"]

qa/Rakefile

 # frozen_string_literal: true
 # rubocop:disable Rails/RakeEnvironment
 
-require 'webdrivers'
-load 'webdrivers/Rakefile'
+load 'tasks/webdrivers.rake'
 
 require_relative 'qa/tools/revoke_all_personal_access_tokens'
 require_relative 'qa/tools/delete_subgroups'

qa/tasks/webdrivers.rake

+# frozen_string_literal: true
+
+require 'webdrivers'
+load 'webdrivers/Rakefile'