GRN2-241: Switched Docker base image to Alpine (#853)

* Switched to alpine image

* Switch Docker base image to alpine

* Removed uneeded code

* Slimmed it down even further

Dockerfile

@@ -1,34 +1,60 @@
-FROM ruby:2.5
+FROM ruby:2.5.1-alpine AS base
 
-# Install app dependencies.
-RUN apt-get update -qq && apt-get install -y build-essential libpq-dev curl
-
-ADD https://dl.yarnpkg.com/debian/pubkey.gpg /tmp/yarn-pubkey.gpg
-
-RUN apt-key add /tmp/yarn-pubkey.gpg && rm /tmp/yarn-pubkey.gpg && \
-echo 'deb http://dl.yarnpkg.com/debian/ stable main' > /etc/apt/sources.list.d/yarn.list &&  \
-curl -sL https://deb.nodesource.com/setup_10.x | bash - && \
-apt-get update && apt-get install -y nodejs yarn
-
-# Set an environment variable for the install location.
-ENV RAILS_ROOT /usr/src/app
+# Set a variable for the install location.
+ARG RAILS_ROOT=/usr/src/app
+# Set Rails environment.
+ENV RAILS_ENV production
+ENV BUNDLE_APP_CONFIG="$RAILS_ROOT/.bundle"
 
 # Make the directory and set as working.
 RUN mkdir -p $RAILS_ROOT
 WORKDIR $RAILS_ROOT
 
-# Set Rails environment.
-ENV RAILS_ENV production
+ARG BUILD_PACKAGES="build-base curl-dev git"
+ARG DEV_PACKAGES="postgresql-dev sqlite-libs sqlite-dev yaml-dev zlib-dev nodejs yarn"
+ARG RUBY_PACKAGES="tzdata"
+
+# Install app dependencies.
+RUN apk update \
+    && apk upgrade \
+    && apk add --update --no-cache $BUILD_PACKAGES $DEV_PACKAGES $RUBY_PACKAGES
 
 COPY Gemfile* ./
-RUN bundle install --without development test --deployment --clean
+COPY Gemfile Gemfile.lock $RAILS_ROOT/
+
+RUN bundle config --global frozen 1 \
+    && bundle install --deployment --without development:test:assets -j4 --path=vendor/bundle \
+    && rm -rf vendor/bundle/ruby/2.5.0/cache/*.gem \
+    && find vendor/bundle/ruby/2.5.0/gems/ -name "*.c" -delete \
+    && find vendor/bundle/ruby/2.5.0/gems/ -name "*.o" -delete
 
 # Adding project files.
 COPY . .
 
-# Precompile assets
-RUN SECRET_KEY_BASE="$(bundle exec rake secret)" bundle exec rake assets:clean
-RUN SECRET_KEY_BASE="$(bundle exec rake secret)" bundle exec rake assets:precompile
+RUN SECRET_KEY_BASE="1" bin/rails assets:precompile
+
+# Remove folders not needed in resulting image
+RUN rm -rf tmp/cache app/assets vendor/assets spec
+
+############### Build step done ###############
+
+FROM ruby:2.5.1-alpine
+
+# Set a variable for the install location.
+ARG RAILS_ROOT=/usr/src/app
+ARG PACKAGES="tzdata postgresql-client sqlite-libs nodejs bash"
+
+ENV RAILS_ENV=production
+ENV BUNDLE_APP_CONFIG="$RAILS_ROOT/.bundle"
+
+WORKDIR $RAILS_ROOT
+
+RUN apk update \
+    && apk upgrade \
+    && apk add --update --no-cache $PACKAGES
+
+
+COPY --from=base $RAILS_ROOT $RAILS_ROOT
 
 # Expose port 80.
 EXPOSE 80

Gemfile

@@ -23,7 +23,7 @@ gem 'uglifier', '>= 1.3.0'
 gem 'coffee-rails', '~> 4.2'
 
 # See https://github.com/rails/execjs#readme for more supported runtimes
-gem 'mini_racer', platforms: :ruby
+# gem 'mini_racer', platforms: :ruby
 
 # Use jquery as the JavaScript library
 gem 'jquery-rails', '~> 4.3.3'
@@ -121,7 +121,7 @@ end
 gem 'remote_syslog_logger'
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
-gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
+gem 'tzinfo-data'
 
 gem 'coveralls', require: false
 

Gemfile.lock

@@ -153,7 +153,6 @@ GEM
       railties (>= 3.2.16)
     json (2.2.0)
     jwt (2.2.1)
-    libv8 (7.3.492.27.1)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -173,8 +172,6 @@ GEM
     mimemagic (0.3.3)
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
-    mini_racer (0.2.6)
-      libv8 (>= 6.9.411)
     minitest (5.11.3)
     msgpack (1.3.0)
     multi_json (1.13.1)
@@ -326,6 +323,8 @@ GEM
     turbolinks-source (5.2.0)
     tzinfo (1.2.5)
       thread_safe (~> 0.1)
+    tzinfo-data (1.2019.3)
+      tzinfo (>= 1.0.0)
     uglifier (4.1.20)
       execjs (>= 0.3.0, < 3)
     unicode-display_width (1.6.0)
@@ -369,7 +368,6 @@ DEPENDENCIES
   jquery-ui-rails
   listen (~> 3.0.5)
   lograge
-  mini_racer
   net-ldap
   omniauth
   omniauth-bn-launcher!

app/controllers/themes_controller.rb

@@ -26,7 +26,7 @@ class ThemesController < ApplicationController
     lighten_color = @settings.get_value("Primary Color Lighten") || Rails.configuration.primary_color_lighten_default
     darken_color = @settings.get_value("Primary Color Darken") || Rails.configuration.primary_color_darken_default
 
-    file_name = Rails.root.join('app', 'assets', 'stylesheets', 'utilities', '_primary_themes.scss')
+    file_name = Rails.root.join('lib', 'assets', '_primary_themes.scss')
     @file_contents = File.read(file_name)
 
     # Include the variables and covert scss file to css

bin/start

@@ -19,6 +19,4 @@ else
   bundle exec rake db:schema:load
 fi
 
-bundle exec rake assets:precompile
-
 exec bundle exec puma -C config/puma.rb

config/environments/production.rb

@@ -143,5 +143,5 @@ Rails.application.configure do
   config.active_record.dump_schema_after_migration = false
 
   # Set the relative url root for deployment to a subdirectory.
-  config.relative_url_root = ENV['RELATIVE_URL_ROOT'] || "/b" if ENV['RELATIVE_URL_ROOT'] != "/"
+  config.relative_url_root = ENV['RELATIVE_URL_ROOT'].present? ? ENV['RELATIVE_URL_ROOT'] : "/b"
 end

config/initializers/assets.rb

@@ -13,4 +13,4 @@ Rails.application.config.assets.version = '1.0'
 # Precompile additional assets.
 # application.js, application.css, and all non-JS/CSS in the app/assets
 # folder are already added.
-Rails.application.config.assets.precompile += %w(pickr.min.js monolith.min.scss)
+Rails.application.config.assets.precompile += %w(_primary_theme.scss pickr.min.js monolith.min.scss)