#!/bin/sh
set -uf

## Wrapper script running "btrbk" and sending email with results

# Email recipients, separated by whitespace:
mailto=$MAILTO

# btrbk configuration file:
config="/etc/btrbk/btrbk.conf"

# Uncomment this if you only want to receive error messages:
#btrbk_opts="-q"
#skip_empty_mail=yes

# Email subject:
mail_subject_prefix="btrbk <${HOSTNAME:-localhost}>"


# run btrbk
ret=$(/usr/sbin/btrbk -c "$config" ${btrbk_opts:-} run 2>&1)
exitcode=$?
case $exitcode in
    0)  status="All backups successful"
	;;
    10) status="ERROR: At least one backup task aborted!"
	;;
    *)  status="ERROR: $btrbk failed with error code $exitcode"
	;;
esac

# filter "At subvol ..." messages from "btrfs send" and "btrfs receive" (see issue #33).
ret=$(echo "$ret" | grep -v '^At subvol ')


# skip email sending if skip_empty_mail=yes
if [ "${skip_empty_mail:-no}" = "yes" ] && [ -z "$ret" ] && [ $exitcode -eq 0 ]; then
    exit 0
fi

# send email
echo "$ret" | /bin/mail -s "$mail_subject_prefix - $status" $mailto
if [ $? != 0 ]; then
    echo "$0: ERROR: Failed to send btrbk mail to \"$mailto\"" 1>&2
    echo "$ret" 1>&2
    exit 1
fi