Dockerfile

#################################
#          Variables            #
#################################

# Versioning
ARG RUBY_VERSION="3.2.1"
ARG BUNDLER_VERSION="2.4.6"

# Packages
# ARG BUILD_PACKAGES="nodejs build-essential libc6"
ARG BUILD_PACKAGES
ARG RUN_PACKAGES="bash libpq5 libvips42 libvips-dev"

# Scripts
ARG PRE_INSTALL_SCRIPT
ARG INSTALL_SCRIPT
ARG PRE_BUILD_SCRIPT
ARG BUILD_SCRIPT="bundle exec rake assets:precompile"
ARG POST_BUILD_SCRIPT="echo \"(built at: $(date '+%Y-%m-%d %H:%M:%S'))\" > /app-src/BUILD_INFO"

# Bundler specific
ARG BUNDLE_WITHOUT="development:metrics:test"

# App specific
ARG RAILS_ENV="production"
ARG RACK_ENV="production"
ARG RAILS_HOST_NAME="unused.example.net"
ARG SECRET_KEY_BASE="needs-to-be-set"
ARG RAILS_DB_ADAPTER="nulldb"

# If you want to directly specify build infos
ARG BUILD_COMMIT
ARG BUILD_REPO
ARG BUILD_REPO_URL
ARG BUILD_REF

# Github specific
ARG GITHUB_SHA
ARG GITHUB_REPOSITORY
ARG GITHUB_REPOSITORY_URL
ARG GITHUB_REF_NAME

# # Gitlab specific
# ARG CI_COMMIT_SHA
# ARG CI_REPOSITORY_URL
# ARG CI_COMMIT_REF_NAME
# ARG BUILD_COMMIT="$CI_COMMIT_SHA"
# ARG BUILD_REPO="$CI_REPOSITORY_URL"
# ARG BUILD_REF="$CI_COMMIT_REF_NAME"

# # Openshift specific
# ARG OPENSHIFT_BUILD_COMMIT
# ARG OPENSHIFT_BUILD_SOURCE
# ARG OPENSHIFT_BUILD_REFERENCE
# ARG BUILD_COMMIT="$OPENSHIFT_BUILD_COMMIT"
# ARG BUILD_REPO="$OPENSHIFT_BUILD_SOURCE"
# ARG BUILD_REF="$OPENSHIFT_BUILD_REFERENCE"

# Runtime ENV vars
ARG SENTRY_CURRENT_ENV
ARG PS1="$SENTRY_CURRENT_ENV > "
ARG TZ="Europe/Zurich"

# Custom ARGs for Puzzletime
ARG SKIP_MEMCACHE_CHECK=true

#################################
#          Build Stage          #
#################################

FROM ruby:${RUBY_VERSION} AS build

# arguments for steps
ARG PRE_INSTALL_SCRIPT
ARG BUILD_PACKAGES
ARG INSTALL_SCRIPT
ARG BUNDLER_VERSION
ARG PRE_BUILD_SCRIPT
ARG BUNDLE_WITHOUT
ARG BUILD_SCRIPT
ARG POST_BUILD_SCRIPT

# arguments potentially used by steps
ARG RACK_ENV
ARG RAILS_ENV
ARG RAILS_HOST_NAME
ARG SECRET_KEY_BASE
ARG TZ

# Custom ARGs
ARG SKIP_MEMCACHE_CHECK

# Set build shell
SHELL ["/bin/bash", "-c"]

# Use root user
USER root

RUN bash -vxc "${PRE_INSTALL_SCRIPT:-"echo 'no PRE_INSTALL_SCRIPT provided'"}"

# Install dependencies
RUN    export DEBIAN_FRONTEND=noninteractive \
  && apt-get update \
  && apt-get upgrade -y \
  && apt-get install -y --no-install-recommends ${BUILD_PACKAGES}

RUN bash -vxc "${INSTALL_SCRIPT:-"echo 'no INSTALL_SCRIPT provided'"}"

# Install specific versions of dependencies
RUN gem install bundler:${BUNDLER_VERSION} --no-document

# Install nulldb adapter
ARG RAILS_DB_ADAPTER
RUN gem install activerecord-nulldb-adapter --no-document

# TODO: Load artifacts

# set up app-src directory
COPY . /app-src
WORKDIR /app-src

RUN bash -vxc "${PRE_BUILD_SCRIPT:-"echo 'no PRE_BUILD_SCRIPT provided'"}"

# install gems and build the app
RUN    bundle config set --local deployment 'true' \
  && bundle config set --local without ${BUNDLE_WITHOUT} \
  && bundle package \
  && bundle install \
  && bundle clean

RUN bash -vxc "${BUILD_SCRIPT:-"echo 'no BUILD_SCRIPT provided'"}"

RUN bash -vxc "${POST_BUILD_SCRIPT:-"echo 'no POST_BUILD_SCRIPT provided'"}"

# TODO: Save artifacts

RUN rm -rf vendor/cache/ .git spec/ node_modules/


#################################
#           Run Stage           #
#################################

# This image will be replaced by Openshift
FROM ruby:${RUBY_VERSION}-slim AS app

# Set runtime shell
SHELL ["/bin/bash", "-c"]

# Add user
RUN adduser --disabled-password --uid 1001 --gid 0 --gecos "" app

# arguments for steps
ARG RUN_PACKAGES
ARG BUNDLER_VERSION
ARG BUNDLE_WITHOUT

# arguments potentially used by steps
ARG RACK_ENV
ARG RAILS_ENV

# data persisted in the image
ARG PS1
ARG TZ
ARG GITHUB_SHA
ARG GITHUB_REPOSITORY
ARG GITHUB_REPOSITORY_URL
ARG GITHUB_REF_NAME
ARG BUILD_COMMIT
ARG BUILD_REPO
ARG BUILD_REPO_URL
ARG BUILD_REF

# Custom ARGs
ARG SKIP_MEMCACHE_CHECK

ENV PS1="${PS1}" \
  TZ="${TZ}" \
  BUILD_REPO="${BUILD_REPO:-${GITHUB_REPOSITORY}}" \
  BUILD_REPO_URL="${BUILD_REPO_URL:-${GITHUB_REPOSITORY_URL}}" \
  BUILD_REF="${BUILD_REF:-${GITHUB_REF_NAME}}" \
  BUILD_COMMIT="${BUILD_COMMIT:-${GITHUB_SHA}}" \
  RAILS_ENV="${RAILS_ENV}" \
  RACK_ENV="${RACK_ENV}"

# Install dependencies, remove apt!
RUN    export DEBIAN_FRONTEND=noninteractive \
  && apt-get update \
  && apt-get upgrade -y \
  && apt-get install -y ${RUN_PACKAGES} vim curl less \
  && apt-get clean \
  && rm -rf /var/cache/apt/archives/* /var/lib/apt/lists/* /tmp/* /var/tmp/* \
  && truncate -s 0 /var/log/*log

# Copy deployment ready source code from build
COPY --from=build /app-src /app-src
WORKDIR /app-src

# Set group permissions to app folder
RUN    chgrp -R 0 /app-src \
  && chmod -R u+w,g=u /app-src

# support bin-stubs
ENV HOME=/app-src \
  PATH=/app-src/bin:$PATH

# Install specific versions of dependencies
RUN gem install bundler:${BUNDLER_VERSION} --no-document

# Use cached gems
RUN    bundle config set --local deployment 'true' \
  && bundle config set --local without ${BUNDLE_WITHOUT} \
  && bundle install

USER 1001

CMD ["bundle", "exec", "puma", "-t", "8"]