#!/usr/bin/env bash

# copy from https://github.com/nginx/unit/blob/master/pkg/docker/docker-entrypoint.sh

# /var/lib/unit               => /usr/local/nginx-unit/state
# /var/run/control.unit.sock  => /usr/local/nginx-unit/control.unit.sock
# /var/run/unit.pid           => /usr/local/nginx-unit/unit.pid

echo "==> Initial Configuration, please see https://unit.nginx.org/installation/#initial-configuration"

set -e

curl_put()
{
    RET=`/usr/bin/curl -s -w '%{http_code}' -X PUT --data-binary @$1 --unix-socket /usr/local/nginx-unit/control.unit.sock http://localhost/$2`
    RET_BODY=${RET::-3}
    RET_STATUS=$(echo $RET | /usr/bin/tail -c 4)
    if [ "$RET_STATUS" -ne "200" ]; then
        echo "$0: Error: HTTP response status code is '$RET_STATUS'"
        echo "$RET_BODY"
        return 1
    else
        echo "$0: OK: HTTP response status code is '$RET_STATUS'"
        echo "$RET_BODY"
    fi
    return 0
}

if [ "$1" = "unitd" ]; then
    if /usr/bin/find "/usr/local/nginx-unit/state/" -mindepth 1 -print -quit 2>/dev/null | /bin/grep -q .; then
        echo "$0: /usr/local/nginx-unit/state/ is not empty, skipping initial configuration..."
    else
        if /usr/bin/find "/docker-entrypoint.d/" -mindepth 1 -print -quit 2>/dev/null | /bin/grep -q .; then
            echo "$0: /docker-entrypoint.d/ is not empty, launching Unit daemon to perform initial configuration..."
            /usr/sbin/unitd --user root --group root --log /var/log/nginx-unit/nginx-unit.log --control unix:/usr/local/nginx-unit/control.unit.sock

            while [ ! -S /usr/local/nginx-unit/control.unit.sock ]; do echo "$0: Waiting for control socket to be created..."; /bin/sleep 0.1; done
            # even when the control socket exists, it does not mean unit has finished initialisation
            # this curl call will get a reply once unit is fully launched
            /usr/bin/curl -s -X GET --unix-socket /usr/local/nginx-unit/control.unit.sock http://localhost/

            echo "$0: Looking for certificate bundles in /docker-entrypoint.d/..."
            for f in $(/usr/bin/find /docker-entrypoint.d/ -type f -name "*.pem"); do
                echo "$0: Uploading certificates bundle: $f"
                curl_put $f "certificates/$(basename $f .pem)"
            done

            echo "$0: Looking for configuration snippets in /docker-entrypoint.d/..."
            for f in $(/usr/bin/find /docker-entrypoint.d/ -type f -name "*.json"); do
                echo "$0: Applying configuration $f";
                curl_put $f "config"
            done

            echo "$0: Looking for shell scripts in /docker-entrypoint.d/..."
            for f in $(/usr/bin/find /docker-entrypoint.d/ -type f -name "*.sh"); do
                echo "$0: Launching $f";
                "$f"
            done

            # warn on filetypes we don't know what to do with
            for f in $(/usr/bin/find /docker-entrypoint.d/ -type f -not -name "*.sh" -not -name "*.json" -not -name "*.pem"); do
                echo "$0: Ignoring $f";
            done

            echo "$0: Stopping Unit daemon after initial configuration..."
            kill -TERM `/bin/cat /usr/local/nginx-unit/unit.pid`

            while [ -S /usr/local/nginx-unit/control.unit.sock ]; do echo "$0: Waiting for control socket to be removed..."; /bin/sleep 0.1; done

            echo
            echo "$0: Unit initial configuration complete; ready for start up..."
            echo
        else
            echo "$0: /docker-entrypoint.d/ is empty, skipping initial configuration..."
        fi
    fi
fi

exec "$@"
