entrypoint.sh

#!/usr/bin/env bash

# Based on: Deni Bertović https://denibertovic.com/posts/handling-permissions-with-docker-volumes/

# Use the LOCAL_USER_ID that was passed in, or fallback to 9001
USER_ID="${LOCAL_USER_ID:-9001}"

# Get the username that is associated with the user id (if any)
USER_NAME="$(getent passwd | awk -F: '$3 == '"$USER_ID"' { print $1 }')"

# Does the user already exist?
if [ "$USER_NAME" == "" ]; then
  # No, we need to create it.
  USER_NAME=user

  # Create the home folder if it doesn't already exist.
  if [ ! -d "/home/user" ]; then
    MAKE_HOME='-m'
  fi

  # Create the user.
  useradd --shell /bin/bash -u "$USER_ID" $MAKE_HOME user
  export HOME="/home/$USER_NAME"

  # Ensure home is owned by user (Docker may have created it as root when mounting volumes)
  chown "$USER_NAME" $HOME
fi

# Execute the command
gosu "$USER_NAME" "$@"