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docker-library--ruby/2.1/Dockerfile

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FROM buildpack-deps:jessie
ENV RUBY_MAJOR 2.1
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ENV RUBY_VERSION 2.1.5
# some of ruby's build scripts are written in ruby
# we purge this later to make sure our final image uses what we just built
RUN apt-get update \
&& apt-get install -y bison libgdbm-dev ruby \
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&& rm -rf /var/lib/apt/lists/* \
&& mkdir -p /usr/src/ruby \
&& curl -SL "http://cache.ruby-lang.org/pub/ruby/$RUBY_MAJOR/ruby-$RUBY_VERSION.tar.bz2" \
| tar -xjC /usr/src/ruby --strip-components=1 \
&& cd /usr/src/ruby \
&& autoconf \
&& ./configure --disable-install-doc \
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&& make -j"$(nproc)" \
&& make install \
&& apt-get purge -y --auto-remove bison libgdbm-dev ruby \
&& rm -r /usr/src/ruby
# skip installing gem documentation
RUN echo 'gem: --no-rdoc --no-ri' >> "$HOME/.gemrc"
# install things globally, for great justice
ENV GEM_HOME /usr/local/bundle
ENV PATH $GEM_HOME/bin:$PATH
RUN gem install bundler \
&& bundle config --global path "$GEM_HOME" \
&& bundle config --global bin "$GEM_HOME/bin"
# don't create ".bundle" in all our apps
ENV BUNDLE_APP_CONFIG $GEM_HOME
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CMD [ "irb" ]