tunnel.sh

#!/bin/sh
set -eu

URL_FILE="${TUNNEL_URL_FILE:-/data/tunnel_url.txt}"
mkdir -p "$(dirname "$URL_FILE")"
touch "$URL_FILE"

rm -f /tmp/tunnel_log
mkfifo /tmp/tunnel_log || true

cloudflared tunnel --no-autoupdate --url "${1:-http://localhost:8080}" > /tmp/tunnel_log 2>&1 &
CFPID=$!

cleanup() {
  kill -9 "$CFPID" 2>/dev/null || true
  rm -f /tmp/tunnel_log
  exit 0
}
trap cleanup INT TERM HUP

while IFS= read -r line; do
  printf '%s\n' "$line" >&2
  url=$(printf '%s' "$line" | grep -oE 'https://[a-zA-Z0-9-]+\.trycloudflare\.com' | head -1 || true)
  if [ -n "$url" ]; then
    current=$(cat "$URL_FILE" 2>/dev/null || true)
    if [ "$url" != "$current" ]; then
      printf '%s' "$url" > "$URL_FILE"
      printf 'tunnel_url: %s\n' "$url" >&2
    fi
  fi
done < /tmp/tunnel_log