FROM node:10

WORKDIR /usr/src/app
COPY package*.json /usr/src/app

# install socat and ssh to talk to the host ssh-agent
RUN  apt-get update && apt-get install --quiet --yes socat \
  # create variable called SSH_AUTH_SOCK, ssh will use this automatically
  && mkdir -p /tmp \
  && export SSH_AUTH_SOCK=/tmp/auth.sock \
  # make SSH_AUTH_SOCK useful by connecting it to hosts ssh-agent over localhost:56789
  && /bin/sh -c "socat UNIX-LISTEN:${SSH_AUTH_SOCK},unlink-early,mode=777,fork TCP:host.docker.internal:56789 &" \
  # stuff I needed my ssh keys for
  && mkdir -p ~/.ssh \
  # add gitlab fingerprint to known hosts
  && ssh-keyscan gitlab.com >> ~/.ssh/known_hosts \
  # Execute the command you need SSH keys for
  && npm install