ARG ALPINE_VERSION=3.13.6
ARG RUBY_VERSION=2.7
ARG RUBY_PATCH=5
ARG BASE_IMAGE=alpine
ARG EMAIL=monit@sutty.nl
FROM ${BASE_IMAGE}:${ALPINE_VERSION} as build
ENV EMAIL ${EMAIL:-monit@sutty.nl}

RUN apk add --no-cache ruby patch
RUN test "${RUBY_VERSION}.${RUBY_PATCH}" = `ruby -e 'puts RUBY_VERSION'`

# Patch rubygems to install x86_64-linux-musl gems
COPY ./rubygems-platform-musl.patch /tmp/
RUN cd /usr/lib/ruby/${RUBY_VERSION}.0 && patch -Np 0 -i /tmp/rubygems-platform-musl.patch || true

FROM ${BASE_IMAGE}:${ALPINE_VERSION}
ARG ALPINE_VERSION
ARG RUBY_VERSION
ARG RUBY_PATCH
MAINTAINER "f <f@sutty.nl>"

# Install ruby and extracted gems and copy patched rubygems
RUN apk add --no-cache tzdata ruby && rm /usr/lib/ruby/${RUBY_VERSION}.0/rubygems.rb
RUN apk add --no-cache ruby-json ruby-bigdecimal ruby-rake ruby-bundler ruby-irb ruby-io-console ruby-etc
COPY --from=build /usr/lib/ruby/${RUBY_VERSION}.0/rubygems.rb /usr/lib/ruby/${RUBY_VERSION}.0/