entrypoint.sh

#!/bin/bash

# *** Dupl code *** see app-dev/entrypoint.sh too [7GY8F2]
# (Cannot fix, Docker doesn't support symlinks in build dirs.)

cd /opt/talkyard/server

# Create user 'owner' with the same id as the person who runs docker, so that file
# 'gulp build' creates will be owned by that person (otherwise they'll be owned by root
# on the host machine. Which makes them invisible & unusable, on the host machine).
# But skip this if we're root already (perhaps we're root in a virtual machine).
file_owner_id=`ls -adn | awk '{ print $3 }'`
id -u owner >> /dev/null 2>&1
if [ $? -eq 1 -a $file_owner_id -ne 0 ] ; then
  # $? -eq 1 means that the last command failed, that is, user 'owner' not yet created.
  # So create it:
  # (--home-dir needs to be specified, because `npm install` and `bower install` write to
  # cache dirs in the home dir, and it's nice to have those dirs below a dir mounted on the
  # Docker host, so they'll persist across container recreations. [NODEHOME])
  # -D = don't assign password (would block Docker waiting for input).
  echo "Creating user 'owner' with id $file_owner_id..."
  # Alpine:
  # adduser -u $file_owner_id -h /opt/talkyard/server/volumes/gulp-home -D owner
  # Debian:
  adduser \
      --uid $file_owner_id  \
      --home /opt/talkyard/server/volumes/gulp-home  \
      --disabled-password  \
      --gecos ""  \
      owner   # [5RZ4HA9]
fi

if [ -z "$*" ] ; then
  echo 'No command specified. What do you want to do? Try "gulp"?'
  echo 'The whole docker-compose command would then be:'
  echo '  docker-compose run --rm gulp gulp'
  echo '(the first "gulp" is the container name, the second is the gulp build command).'
  exit 0
fi

# Without exec, Docker wouldn't be able to stop the container normally.
# See: https://docs.docker.com/engine/userguide/eng-image/dockerfile_best-practices/#entrypoint
# """uses the exec Bash command so final running application becomes container’s PID 1"""
# — they use 'gosu' instead of 'su':  exec gosu postgres "$@"
# but for me 'su' works fine.
if [ $file_owner_id -ne 0 ] ; then
  # Use user owner, which has the same user id as the file owner on the Docker host.
  echo "Running the Gulp CMD as user id $file_owner_id":
  set -x
  # Avoid permission errors caused by root sometimes somehow becoming the owner.
  chown -R owner.owner /opt/talkyard/server/volumes/gulp-home
  chown -R owner.owner /opt/talkyard/server/node_modules
  exec su -c "$*" owner
else
  # We're root (user id 0), both on the Docker host and here in the container.
  # `exec su ...` is the only way I've found that makes Yarn and Gulp respond to CTRL-C,
  # so using `su` here although we're root already.
  # Specify HOME so files that Node.js caches will persist across container recreations. [NODEHOME])
  echo "Running the Gulp CMD as root":
  set -x
  exec su -c "HOME=/opt/talkyard/server/volumes/gulp-home $*" root
fi