theme.park.app/docker-mods/vuetorrent/root/etc/cont-init.d/98-themepark

#!/usr/bin/with-contenv bash
APP_FILEPATH='/config/qBittorrent/qBittorrent.conf'
INDEX_FILEPATH='/vuetorrent/public/index.html'
if [ "${TP_HOTIO}" = true ]; then
    echo 'Changing to Hotio file paths!'
    APP_FILEPATH='/config/config/qBittorrent.conf'
    INDEX_FILEPATH='/app/vuetorrent/public/index.html'
fi

# Backup config
if [[ ! -f "${APP_FILEPATH}.bak" ]]; then
    echo "Creating qBittorrent.conf backup in /config."
	cp -p ${APP_FILEPATH} "${APP_FILEPATH}.bak"
fi

# Restore qBittorrent.conf
if [ "${TP_DISABLE_THEME}" = true ]; then
  echo "Restoring backup of qBittorrent.conf" 
  sed -i "s/WebUI\\\AlternativeUIEnabled=.*$/WebUI\\\AlternativeUIEnabled=false/g" "${APP_FILEPATH}";
  exit 0
fi

# Display variables for troubleshooting 
echo -e "Variables set:\\n\
'TP_DOMAIN'=${TP_DOMAIN}\\n\
'TP_THEME'=${TP_THEME}\\n"

# Set default
if [[ -z ${TP_DOMAIN} ]]; then
    echo 'No domain set, defaulting to theme-park.dev'
    TP_DOMAIN='theme-park.dev'
fi

case ${TP_DOMAIN} in
  *"github.io"*)
  echo "Switching to github.io URL style"
    TP_DOMAIN="${TP_DOMAIN}\/theme.park"
    ;;
esac

if [[ -z ${TP_THEME} ]]; then
    echo 'No theme set, defaulting to organizr-dark'
    TP_THEME='organizr-dark'
fi
RELEASE_FILEPATH='/vuetorrent/release.json'
NEEDS_UPDATE=false
CURRENT_RELEASE=$(curl -s https://api.github.com/repos/WDaan/VueTorrent/releases/latest | jq -r ".assets[]")

# ===============================================
install_deps() {
    if ! [[ -x "$(command -v jq)" ]]; then
        echo '-------------------------'
        echo '| Installing jq package |'
        echo '-------------------------'
        apt-get update &&
            apt-get install -y jq
    fi
}
check_updates() {
    if [[ ! -d ./vuetorrent ]]; then
        NEEDS_UPDATE=true
    elif [[ ! -f $RELEASE_FILEPATH ]]; then
        NEEDS_UPDATE=true
    else
        old_date=$(date -d $(cat "${RELEASE_FILEPATH}" | jq -r ".updated_at") +%s)
        new_date=$(date -d $(echo $CURRENT_RELEASE | jq -r ".updated_at") +%s)
        if [ $new_date -gt $old_date ]; then
            NEEDS_UPDATE=true
        fi
    fi
}
update_ui() {
    printf '\nDownloading qBittorrent webui to "/vuetorrent"..please wait\n'
    curl -L $(echo $CURRENT_RELEASE | jq -r ".browser_download_url") --output /tmp/vuetorrent.zip
    printf '\nDownload finished\n\n'
    if [[ -d /vuetorrent ]]; then
        rm -rf /vuetorrent
    fi
    # mkdir -p /vuetorrent
    unzip -q /tmp/vuetorrent.zip -d /
    echo $CURRENT_RELEASE >"${RELEASE_FILEPATH}"
}
# ===============================================

echo '-----------------------------------------'
echo '| qBittorrent vuetorrent theme.park Mod |'
echo '-----------------------------------------'

if [[ -z ${TP_HOTIO} ]]; then
    install_deps
    check_updates

    if [ "$NEEDS_UPDATE" = true ]; then
        echo '---------------------------------------'
        echo '| Downloading WebUI files from github |'
        echo '---------------------------------------'
        update_ui
    else
        echo '  WebUI files are up-to-date!'
    fi

    if ! grep -q "WebUI\\\RootFolder" "${APP_FILEPATH}"; then
        echo '--------------------------------------'
        echo '| Adding WebUI\RootFolder=/vuetorrent |'
        echo '--------------------------------------'
        sed -i -e '$aWebUI\\RootFolder=/vuetorrent' "${APP_FILEPATH}"
    fi

    if ! grep -q "WebUI\\\AlternativeUIEnabled" "${APP_FILEPATH}"; then
        echo '------------------------------------------'
        echo '| Adding WebUI\AlternativeUIEnabled=true |'
        echo '------------------------------------------'
        sed -i -e '$aWebUI\\AlternativeUIEnabled=true' "${APP_FILEPATH}"
    fi

    if ! grep -q "WebUI\\\RootFolder=/vuetorrent" "${APP_FILEPATH}" || ! grep -q "WebUI\\\AlternativeUIEnabled=true" "${APP_FILEPATH}"; then
        echo '-------------------------------------------------------'
        echo '| Updating RootFolder and AlternativeUIEnabled values |'
        echo '-------------------------------------------------------'
        sed -i "s/WebUI\\\AlternativeUIEnabled=.*$/WebUI\\\AlternativeUIEnabled=true/g" "${APP_FILEPATH}"
        sed -i "s/WebUI\\\RootFolder=.*$/WebUI\\\RootFolder=\/vuetorrent/g" "${APP_FILEPATH}"
    fi
fi

# Adding stylesheets
if ! grep -q "${TP_DOMAIN}" "${INDEX_FILEPATH}"; then
    echo '---------------------------------------------------------'
    echo '| Adding the stylesheet to /vuetorrent/public/index.html |'
    echo '---------------------------------------------------------'
    sed -i "s/<\/body>/<link rel='stylesheet' href='https:\/\/${TP_DOMAIN}\/CSS\/themes\/vuetorrent\/vuetorrent-base.css'><\/body> /g" "${INDEX_FILEPATH}"
    sed -i "s/<\/body>/<link rel='stylesheet' href='https:\/\/${TP_DOMAIN}\/CSS\/variables\/${TP_THEME}.css'><\/body> /g" "${INDEX_FILEPATH}"
    printf 'Stylesheet set to %s on public index.html\n' "${TP_THEME}"
fi