nginx-s3/overlay/usr/local/bin/entrypoint

#!/usr/bin/env sh

# shellcheck disable=SC3040
set -eo pipefail

# shellcheck disable=SC1091
. /usr/local/lib/log.sh

start_server() {
    log_info "Start nginx server"
    if ! nginx -e stderr -q -g 'daemon off;' -t; then
        log_error 'Nginx config validation failed, exit'
        exit 1
    fi

    exec nginx -e stderr -g "daemon off;" &
    PID=$!

    {
        while true; do
            inotifywait -rq --timefmt "%F %T" --format "%T [INFO] [$(basename "$0")] %e %f" -e modify,move,create,delete /etc/nginx/
            log_info 'Detected nginx config update, run validation'

            if ! nginx -e stderr -q -g 'daemon off;' -t; then
                log_warn 'Nginx config validation failed, skip reload'
                continue
            fi

            log_info 'Reload nginx to apply config update'
            kill -HUP $PID
        done
    } &

    wait $PID
}

run_config() {
    log_info "Start nginx config service"
    /usr/local/bin/gomplate -d config=/etc/nginx-s3/config.yaml -o /etc/nginx/conf.d/vhosts.conf -f /etc/templates/vhosts.conf.tmpl --chmod "0640"

    while inotifywait -q --timefmt "%F %T" --format "%T [INFO] [$(basename "$0")] %e %f" -e modify,move,create,delete /etc/nginx-s3/config.yaml; do
        log_info "Regenerate nginx config"
        /usr/local/bin/gomplate -d config=/etc/nginx-s3/config.yaml -o /etc/nginx/conf.d/vhosts.conf -f /etc/templates/vhosts.conf.tmpl --chmod "0640"
    done
}

while [ $# -gt 0 ]; do
    case "$1" in
    server)
        start_server
        ;;
    config)
        run_config
        ;;
    *)
        log_info "Unknown entrypoint option $1" >&2
        exit 1
        ;;
    esac
done