docker-entrypoint

#!/usr/bin/env bash

set -o errexit
set -o nounset


# Check container is run as root
if [ $(id -u) != 0 ]; then
    echo "[Entrypoint] WARNING! Container should run as root. Currently running as user $(id -u)."
fi


# Adjust user UID, GID and Docker GID
ADJUST_USER_UID="${ADJUST_USER_UID:-${USER_UID}}"
ADJUST_USER_GID="${ADJUST_USER_GID:-${USER_GID}}"
ADJUST_DOCKER_GID="${ADJUST_DOCKER_GID:-${DOCKER_GID}}"


# Adjust user UID
if [ "${ADJUST_USER_UID}" != "${USER_UID}" ]; then
    echo "[Entrypoint] Host's user UID (${ADJUST_USER_UID}) mismatch container's user UID (${USER_UID}). Changing ..."

    EXPRESSION="s/python3:x:${USER_UID}:${USER_GID}/python3:x:${ADJUST_USER_UID}:${ADJUST_USER_GID}/"
    echo "[Entrypoint] Executing sed expression '${EXPRESSION}'"
    sed --in-place --expression="${EXPRESSION}" /etc/passwd

    chown --recursive ${ADJUST_USER_UID} /home/python3/
else
    echo "[Entrypoint] Host's user UID (${ADJUST_USER_UID}) matches with container's user UID (${USER_UID}). Continue ..."
fi


# Adjust user GID
if [ "${ADJUST_USER_GID}" != "${USER_GID}" ]; then
    echo "[Entrypoint] Host's user GID (${ADJUST_USER_GID}) mismatch container's user GID (${USER_GID}). Changing ..."

    EXPRESSION="s/python3:x:${USER_GID}/python3:x:${ADJUST_USER_GID}/"
    echo "[Entrypoint] Executing sed expression '${EXPRESSION}'"
    sed --in-place --expression="${EXPRESSION}" /etc/group

    chgrp --recursive ${ADJUST_USER_GID} /home/python3/
else
    echo "[Entrypoint] Host's user GID (${ADJUST_USER_GID}) matches with container's user GID (${USER_GID}). Continue ..."
fi


# Adjust Docker GID
if [ "${ADJUST_DOCKER_GID}" != "${DOCKER_GID}" ]; then
    echo "[Entrypoint] Host's Docker GID (${ADJUST_DOCKER_GID}) mismatch container's Docker GID (${DOCKER_GID}). Changing ..."

    EXPRESSION="s/docker:x:${DOCKER_GID}/docker:x:${ADJUST_DOCKER_GID}/"
    echo "[Entrypoint] Executing sed expression '${EXPRESSION}'"
    sed --in-place --expression="${EXPRESSION}" /etc/group
else
    echo "[Entrypoint] Host's Docker GID (${ADJUST_DOCKER_GID}) matches with container's Docker GID (${DOCKER_GID}). Continue ..."
fi


# Run initialization scripts
for f in /docker-entrypoint-init.d/*; do
    # Check if executable
    if [ ! -x "$f" ]; then
        continue
    fi
    echo "[Entrypoint] $0: running $f"
    sh -c "$f"
    echo
done


echo "[Entrypoint] Running user command : $@"
exec sudo --user=python3 --set-home "$@"