FROM alpine
MAINTAINER massimo@it20.info

# Set ENV_VAR for Greengrass RC to be untarred inside Docker Image
ARG greengrass_release
ENV GREENGRASS_RELEASE=${greengrass_release}

# This Dockerfile builds a GG image for the ARMv7 platform
# curl this file: https://d1onfpft10uf5o.cloudfront.net/greengrass-core/downloads/1.7.0/aws-greengrass-docker-1.7.0.tar.gz
# untar it 
# move into the directory 
# curl this file: https://d1onfpft10uf5o.cloudfront.net/greengrass-core/downloads/1.7.0/greengrass-linux-armv7l-1.7.0.tar.gz 
# replace the Dockerfile in the directory with this Dockerfile
# run this command: docker build -t gg-armv7:1.7 --build-arg "greengrass_release=greengrass-linux-armv7l-1.7.0.tar.gz" . 
# follow the steps documented here: https://docs.aws.amazon.com/greengrass/latest/developerguide/run-gg-in-docker-container.html 

# Install Greengrass Core Dependencies
RUN apk add xz openjdk8 bash nodejs

# Copy Greengrass Licenses AWS IoT Greengrass Docker Image
COPY greengrass-license-v1.pdf /

# Create ggc_user and ggc_group
RUN adduser -S ggc_user
RUN addgroup -S ggc_group

# Copy/Untar Greengrass RC inside Docker Image
COPY $greengrass_release /
RUN tar xzf /$GREENGRASS_RELEASE -C /
RUN rm /$GREENGRASS_RELEASE

# Copy start-up script
COPY "greengrass-entrypoint.sh" /

# Expose 8883 to pub/sub MQTT messages
EXPOSE 8883