Dockerfile.jruby-9.3.9.0

FROM jruby:9.3.9.0-jdk

RUN apt update

# JRuby easily exhausts entropy leading to horrible performance.
# https://github.com/jruby/jruby/wiki/Improving-startup-time#ensure-your-system-has-adequate-entropy
#
# This seems sufficient to get stuff to use a faster random.
RUN sed -i \
  -e "s/securerandom.source=file:\/dev\/random/securerandom.source=file:\/dev\/urandom/g" \
  -e "s/securerandom.strongAlgorithms=NativePRNGBlocking/securerandom.strongAlgorithms=NativePRNG/g" \
  $JAVA_HOME/jre/lib/security/java.security

# Make things not stupidly slow for us.
ENV JRUBY_OPTS=--dev

# Need bundler 2.3.17+ to fix https://github.com/rubygems/rubygems/issues/5743 .
RUN gem update bundler

COPY Gemfile looksee.gemspec /src/
COPY lib/looksee/version.rb /src/lib/looksee/

WORKDIR /src
RUN bundle
COPY . /src
RUN rake ext

CMD ["irb", "-I/src/lib", "-rlooksee"]