#!/bin/bash
set -u

# Make the instance text human readable again (reverse systemd escaping)
friendly="$(systemd-escape --unescape "$1")"

# determine host name: try hostname command, otherwise use $HOSTNAME
if command -v hostname &>/dev/null; then
  host=$(hostname)
else
  host="$HOSTNAME"
fi

# send the Telegram message
/usr/bin/curl -s -X POST \
  "https://api.telegram.org/bot{{ telegram_bot_token }}/sendMessage" \
  -d chat_id="{{ telegram_chat_id }}" \
  --data-urlencode text="service ${friendly//\//-} on ${host} failed"