start.sh

#!/bin/bash 

# Case insenstive match
shopt -s nocaseglob

if [ -z "${ENV_FILE}" ]; then
    ENV_FILE="/secrets/env.json"
fi

echo $DJANGO_SETTINGS_MODULE

if [ -z "${GUNICORN_WORKERS}" ]; then
    GUNICORN_WORKERS=4
fi

if [ -z "${GUNICORN_PORT}" ]; then
    GUNICORN_PORT=5000
fi

if [ -z "${GUNICORN_TIMEOUT}" ]; then
    GUNICORN_TIMEOUT=120
fi

if [ "${GUNICORN_RELOAD}" ]; then
    GUNICORN_RELOAD="--reload"
else
    GUNICORN_RELOAD=""
fi

DOMAIN_JQ='.ALLOWED_HOSTS | . - ["127.0.0.1", "localhost", ".ngrok.io"] | if . | length == 0 then "localhost" else .[0] end'

if [ -z "${ENV_JSON}" ]; then
    MYSQL_HOST=$(jq -r -c ".MYSQL_HOST | values" ${ENV_FILE})
    MYSQL_PORT=$(jq -r -c ".MYSQL_PORT | values" ${ENV_FILE})
    IS_CRON_POD=$(jq -r -c ".IS_CRON_POD | values" ${ENV_FILE})
    PTVSD_ENABLE=$(jq -r -c ".PTVSD_ENABLE | values" ${ENV_FILE})
    CRONTAB_SCHEDULE=$(jq -r -c ".CRONTAB_SCHEDULE | values" ${ENV_FILE})
    RUN_AT_TIMES=$(jq -r -c ".RUN_AT_TIMES | values" ${ENV_FILE})
    DOMAIN=$(jq -r -c "${DOMAIN_JQ} | values" ${ENV_FILE})
else
    MYSQL_HOST=$(echo "${ENV_JSON}" | jq -r -c ".MYSQL_HOST | values")
    MYSQL_PORT=$(echo "${ENV_JSON}" | jq -r -c ".MYSQL_PORT | values")
    IS_CRON_POD=$(echo "${ENV_JSON}" | jq -r -c ".IS_CRON_POD | values")
    PTVSD_ENABLE=$(echo "${ENV_JSON}" | jq -r -c ".PTVSD_ENABLE | values")
    CRONTAB_SCHEDULE=$(echo "${ENV_JSON}" | jq -r -c ".CRONTAB_SCHEDULE | values")
    RUN_AT_TIMES=$(echo "${ENV_JSON}" | jq -r -c ".RUN_AT_TIMES | values")
    DOMAIN=$(echo "${ENV_JSON}" | jq -r -c "${DOMAIN_JQ} | values")
fi

echo "Waiting for DB"
while ! nc -z ${MYSQL_HOST} ${MYSQL_PORT}; do   
  sleep 1 # wait 1 second before check again
done

echo "Setting Git info variables"
export GIT_REPO="$(git config --local remote.origin.url)"
export GIT_COMMIT="$(git rev-parse HEAD)"
export GIT_BRANCH="$(git name-rev $GIT_COMMIT --name-only)"

echo Running python startups
python manage.py migrate

echo "Setting domain of default site record"
# The value for LOCALHOST_PORT is set in docker-compose.yml
if [ ${DOMAIN} == "localhost" ]; then
  python manage.py site --domain="${DOMAIN}:${LOCALHOST_PORT}" --name="${DOMAIN}"
else
  python manage.py site --domain="${DOMAIN}" --name="${DOMAIN}"
fi

# If these values aren't set or they're set to false
# This syntax substitutes False if null or unset
if [ "${IS_CRON_POD:-"false",,}" == "false" ]; then
    if [ "${PTVSD_ENABLE:-"false",,}" == "false" ]; then
        # Start Gunicorn processes
        echo Starting Gunicorn for production

        # application pod
        exec gunicorn dashboard.wsgi:application \
            --bind 0.0.0.0:${GUNICORN_PORT} \
            --workers="${GUNICORN_WORKERS}" \
            ${GUNICORN_RELOAD}
    else
        # Currently ptvsd doesn't work with gunicorn
        # https://github.com/Microsoft/vscode-python/issues/2138
        echo Starting Runserver for development
        export PYTHONPATH="/code:$PYTHONPATH"
        export DJANGO_SETTINGS_MODULE=dashboard.settings
        exec django-admin runserver --ptvsd 0.0.0.0:${GUNICORN_PORT}

    fi
else
    if [ -z "${CRONTAB_SCHEDULE}" ]; then
        echo "CRONTAB_SCHEDULE environment variable not set, crontab cannot be started. Please set this to a crontab acceptable format."
    else
        # in cron pod
        echo Running cron job pod
        echo "CRONTAB_SCHEDULE is ${CRONTAB_SCHEDULE}, RUN_AT_TIMES is ${RUN_AT_TIMES}"

        # Make the log file available
        touch /var/log/cron.log

        # Get the environment from docker saved
        # https://ypereirareis.github.io/blog/2016/02/29/docker-crontab-environment-variables/
        printenv | sed "s/^\([a-zA-Z0-9_]*\)=\(.*\)$/export \1='\2'/g" >> $HOME/.profile

        echo "${CRONTAB_SCHEDULE} . $HOME/.profile; python /code/manage.py runcrons >> /var/log/cron.log 2>&1" | crontab
        crontab -l && cron -L 15 && tail -f /var/log/cron.log
    fi
fi