Dockerfile-dev-node

FROM node:14.16.0
WORKDIR /usr/src/app

# Manage permissions for shared volume on Linux hosts 
# so that files don't get written to host filesystem as root.
# We simply change the Group ID of the node user's primary group (node)
# to the passed in Group ID, then change the User ID and Group ID of the
# node user itself to the passed in User ID and Group ID. Thus, permissions
# will agree between the host and the container since the User and Group
# ID's of the files will match. Container sees host files as owned by user node
# and host sees files owned by whichever user build this image.
# Then we create and chown all named volumes so that the node user has access to them.
ARG USER_ID
ARG GROUP_ID
# node_primary_group will be node
RUN node_user=node \
  && node_primary_group=$(groups ${node_user} | awk -F: '{ print $1}') \
  && echo ${node_user} \
  && echo ${node_primary_group} \
  && groupmod -g ${GROUP_ID} ${node_primary_group} \
  && usermod -u ${USER_ID} -g ${GROUP_ID} ${node_user} \
  && mkdir /home/${node_user}/.npm \
  && chown ${node_user}:${node_primary_group} /home/${node_user}/.npm

VOLUME /home/node/.npm

USER node

CMD ["npm", "run", "start"]