docker-entrypoint.sh

#!/bin/bash

set -e


# usage: file_env VAR [DEFAULT]
#    ie: file_env 'XYZ_DB_PASSWORD' 'example'
# (will allow for "$XYZ_DB_PASSWORD_FILE" to fill in the value of
#  "$XYZ_DB_PASSWORD" from a file, especially for Docker's secrets feature)
file_env() {
	local var="$1"
	local fileVar="${var}_FILE"
	local def="${2:-}"
	if [ "${!var:-}" ] && [ "${!fileVar:-}" ]; then
		echo >&2 "error: both $var and $fileVar are set (but are exclusive)"
		exit 1
	fi
	local val="$def"
	if [ "${!var:-}" ]; then
		val="${!var}"
	elif [ "${!fileVar:-}" ]; then
		val="$(< "${!fileVar}")"
	fi
    echo "$var=$val"
	export "$var"="$val"
	unset "$fileVar"
}

envvars=(
    REDIS_HOST
    REDIS_PORT
    POSTGRES_DB
    POSTGRES_USER
    POSTGRES_PASSWORD
    POSTGRES_HOST
    POSTGRES_PORT
)

for envvar in "${envvars[@]}"; do
    file_env "$envvar"
done

if [ "$1" = "migrate" ]; then
    python manage.py makemigrations plantgrower
    python manage.py migrate
else
    echo "Running $@"
    exec "$@"
fi