#!/usr/bin/env sh
set -e

tmp=/etc/alertmanager/alertmanager.yml

envsubst < /etc/alertmanager/alertmanager.tmpl.yml > "$tmp"

if [ -n "$TELEGRAM_THREAD_ID" ]; then
  sed -i "s#__THREAD_LINE__#message_thread_id: $TELEGRAM_THREAD_ID#" "$tmp"
else
  sed -i "s#__THREAD_LINE__##" "$tmp"
fi

exec /bin/alertmanager --config.file="$tmp" --storage.path=/alertmanager