Dockerfile.erb

FROM quay.io/<%= ENV.fetch('FROM') %>

ENV RUBY_MAJOR_MINOR <%= ENV.fetch('RUBY_MAJOR_MINOR') %>
ENV RUBY_PATCH <%= ENV.fetch('RUBY_PATCH') %>
ENV RUBY_VERSION <%= ENV.fetch('RUBY_MAJOR_MINOR') %>.<%= ENV.fetch('RUBY_PATCH') %>
ENV RUBY_SHA1SUM <%= ENV.fetch('RUBY_SHA1SUM') %>

RUN BUILD_DIR="/tmp/ruby-build" \
 && apt-get update \
 && apt-get -y install wget build-essential zlib1g-dev libssl-dev \
    libreadline6-dev libyaml-dev tzdata \
 && mkdir -p "$BUILD_DIR" \
 && cd "$BUILD_DIR" \
 && wget -q "http://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR_MINOR}/ruby-${RUBY_VERSION}.tar.gz" \
 && echo "${RUBY_SHA1SUM}  ruby-${RUBY_VERSION}.tar.gz" | sha1sum -c - \
 && tar xzf "ruby-${RUBY_VERSION}.tar.gz" \
 && cd "ruby-${RUBY_VERSION}" \
 && ./configure --enable-shared --prefix=/usr \
 && make \
 && make install \
 && cd / \
 && rm -r "$BUILD_DIR" \
 && rm -rf /var/lib/apt/lists/*

# There are 3 cases we need to accommodate here:
# * On Ruby >= 2.3, update_rubygems no longer works, so we run `gem update --system`
# * On Ruby >= 2.0.0 but < 2.3, we can use a pessimistic ~> operator on gem install,
#   to install the latest patch version of a common minor version
# * On Ruby 1.9.3, the pessimistic operator isn't supported by the default gem,
#   so we must gem install a specific version
<% if ENV['RUBYGEMS_VERSION'] %>
RUN (gem install "rubygems-update:~><%= ENV['RUBYGEMS_VERSION'] %>" --no-ri --no-rdoc || \
     gem install rubygems-update --version=<%= ENV['RUBYGEMS_VERSION'] %> --no-ri --no-rdoc) && \
      update_rubygems
<% else %>
RUN gem update --system
<% end %>
#
RUN gem install "bundler:~><%= ENV.fetch('BUNDLER_VERSION') %>" --no-document --force

ADD test /tmp/test
RUN bats /tmp/test