theme.park/docker/root/etc/s6-overlay/s6-rc.d/init-themepark/run

#!/usr/bin/with-contenv bash 

# Display variables for troubleshooting 
echo -e "[theme.park-init] Variables set:\\n\
PUID=${PUID}\\n\
PGID=${PGID}\\n\
TZ=${TZ}\\n\
TP_DOMAIN=${TP_DOMAIN}\\n\
TP_URLBASE=${TP_URLBASE}\\n"

# Remove forward slash
case ${TP_URLBASE} in
  *"/"*)
  TP_URLBASE=$(echo "${TP_URLBASE}" | sed 's/\///g')
    ;;
esac

DEFAULT='/defaults/nginx/site-confs/default.conf'
if [[ ${TP_URLBASE} ]]; then
    if ! grep -q "${TP_URLBASE}" "${DEFAULT}"; then
        sed -i "s/themepark/${TP_URLBASE}/g" ${DEFAULT}
    fi
fi

echo '[theme.park-init] Copying nginx files'
cp -TR /defaults /config

# Remove old config
if [[ -f /config/nginx/site-confs/default ]]; then
    echo '[theme.park-init] Removing old default file'
    rm /config/nginx/site-confs/default
fi

# make our folders and links
mkdir -p \
    /config/www/{css,resources} \
    /config/docker-mods

echo '[theme.park-init] Copying theme files'
# copy theme files
cp -R /app/themepark/css /config/www
cp -R /app/themepark/resources /config/www
cp /app/themepark/index.html /config/www
cp /app/themepark/themes.py /config/www
cp /app/themepark/CNAME /config/www

echo '[theme.park-init] Copying mods'
# copy mods
  for folder in /app/themepark/docker-mods/*; do \
    cp /app/themepark/docker-mods/"${folder##*/}"/root/etc/cont-init.d/98-themepark /config/docker-mods/98-themepark-"${folder##*/}"; \
  done

echo '[theme.park-init] Running themes.py and creating CSS files'
python3 /config/www/themes.py
echo '[theme.park-init] done.'
# permissions
chown -R abc:abc \
    /config