sasasasa/ruby repository overview

FROM buildpack-deps:jessie

# skip installing gem documentation
RUN mkdir -p /usr/local/etc \
        && { \
                echo 'install: --no-document'; \
                echo 'update: --no-document'; \
        } >> /usr/local/etc/gemrc

ENV RUBY_MAJOR 2.4
ENV RUBY_VERSION 2.4.2
ENV RUBY_DOWNLOAD_SHA256 748a8980d30141bd1a4124e11745bb105b436fb1890826e0d2b9ea31af27f735
ENV RUBYGEMS_VERSION 2.6.13

# some of ruby's build scripts are written in ruby
#   we purge system ruby later to make sure our final image uses what we just built
RUN set -ex \
        \
        && buildDeps=' \
                bison \
                dpkg-dev \
                libgdbm-dev \
                ruby \
        ' \
        && apt-get update \
        && apt-get install -y --no-install-recommends $buildDeps \
        && rm -rf /var/lib/apt/lists/* \
        \
        && wget -O ruby.tar.xz "https://cache.ruby-lang.org/pub/ruby/${RUBY_MAJOR%-rc}/ruby-$RUBY_VERSION.tar.xz" \
- Dockerfile.rb 1/76 1%
        \
        && cd /usr/src/ruby \
        \
# hack in "ENABLE_PATH_CHECK" disabling to suppress:
#   warning: Insecure world writable dir
        && { \
                echo '#define ENABLE_PATH_CHECK 0'; \
                echo; \
                cat file.c; \
        } > file.c.new \
        && mv file.c.new file.c \
        \
        && autoconf \
        && gnuArch="$(dpkg-architecture --query DEB_BUILD_GNU_TYPE)" \
        && ./configure \
                --build="$gnuArch" \
                --disable-install-doc \
                --enable-shared \
        && make -j "$(nproc)" \
        && make install \
        \
        && apt-get purge -y --auto-remove $buildDeps \
        && cd / \
        && rm -r /usr/src/ruby \
        \
        && gem update --system "$RUBYGEMS_VERSION"

ENV BUNDLER_VERSION 1.15.4

RUN gem install bundler --version "$BUNDLER_VERSION"

# install things globally, for great justice
# and don't create ".bundle" in all our apps
ENV GEM_HOME /usr/local/bundle
ENV BUNDLE_PATH="$GEM_HOME" \
        BUNDLE_BIN="$GEM_HOME/bin" \
        BUNDLE_SILENCE_ROOT_WARNING=1 \
        BUNDLE_APP_CONFIG="$GEM_HOME"
ENV PATH $BUNDLE_BIN:$PATH
RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
        && chmod 777 "$GEM_HOME" "$BUNDLE_BIN"

docker run -it --name ruby sasasasa/ruby bash
or
docker run -it --name ruby sasasasa/ruby irb