#!/bin/bash
set -u
# Reverse systemd escaping for human-readable mail subject/body
friendly="$(systemd-escape --unescape "$1")"

# Try status with given arg; if empty, also try the escaped version
STATUS_OUT="$(systemctl status --full "$1" 2>/dev/null | head -n 30)"
if [ -z "$STATUS_OUT" ]; then
  esc="$(systemd-escape "$1")"
  STATUS_OUT="$(systemctl status --full "$esc" 2>/dev/null | head -n 30)"
fi

/usr/bin/sendmail -t <<ERRMAIL
To: {{ users.administrator.email }}
From: systemd <{{ users['no-reply'].email }}>
Subject: ${friendly}
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset=UTF-8

A problem with the service ${friendly} occurred:

$STATUS_OUT

ERRMAIL