Upstart service error email alert

gistfile1.txt

#!/bin/bash

srv=$1
to=$2
machine=$3

loglinesinbody=50
logfile="/var/log/upstart/$srv.log"

from="Upstart"
subject="$srv crashed in $machine"
boundary="ZZ_/afg6432dfgkl.94531q"
body="$(tail -n $loglinesinbody $logfile)"
declare -a attachments
attachments=( "$logfile" )

get_mimetype(){
  # warning: assumes that the passed file exists
  file --mime-type "$1" | sed 's/.*: //'
}

# Build headers
{

printf '%s\n' "From: $from
To: $to
Subject: $subject
Mime-Version: 1.0
Content-Type: multipart/mixed; boundary=\"$boundary\"

--${boundary}
Content-Type: text/plain; charset=\"US-ASCII\"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

$body
"

# now loop over the attachments, guess the type
# and produce the corresponding part, encoded base64
for file in "${attachments[@]}"; do

  [ ! -f "$file" ] && echo "Warning: attachment $file not found, skipping" >&2 && continue

  mimetype=$(get_mimetype "$file")

  printf '%s\n' "--${boundary}
Content-Type: $mimetype
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=\"$file\"
"

  base64 "$file"
  echo
done

# print last boundary with closing --
printf '%s\n' "--${boundary}--"

} | sendmail -t -oi

gistfile2.md

Usage

Instead of executing run-my-service use run-my-service || mail.sh SERVICE_NAME 'user1@mail.com,user2@mail.com' MACHINE_NAME.