borg backup with zabbix sender

borg_backup.sh

#!/bin/zsh
# Automated User Data Backup Script for BorgBackup
PATH=$PATH:/usr/local/bin
BORG=/usr/local/bin/borg
ZSENDER=/usr/local/bin/zabbix_sender
JQ=/usr/local/bin/jq
HOST=$(hostname -s)

# Send all output to Graylog
# https://tldp.org/LDP/abs/html/process-sub.html
# https://www.urbanautomaton.com/blog/2014/09/09/redirecting-bash-script-output-to-syslog/
exec 1> >(mlogger -n graylog.home -d  -i -p local0.notice -t $(hostname)\ $(basename $0)) 2>&1

# Trap is from here https://www.howtogeek.com/821320/how-to-trap-errors-in-bash-scripts-on-linux/
# set statement is from here https://gist.github.com/mohanpedala/1e2ff5661761d3abd0385e8223e16425
# or here http://redsymbol.net/articles/unofficial-bash-strict-mode/

set -euo pipefail
trap 'ehandler $? $LINENO' ERR INT TERM

ehandler () {
    echo "$( date ) Backup interrupted. Error: ($1) on $2" >&2;
    exit 2
}


command -v $JQ  >/dev/null 2>&1 || { echo >&2 "I require $JQ but it's not installed.  Aborting."; exit 1; }
command -v $ZSENDER  >/dev/null 2>&1 || { echo >&2 "I require $ZSENDER but it's not installed.  Aborting."; exit 1; }

# Setup environment variables
# shellcheck source=vars.sh
source ~/.config/borg/vars.sh

# some helpers and error handling:
info() {
    printf "\\n%s %s\\n\\n" "$( date )" "$*" >&2;
}

info "Starting backup"

# Backup the most important directories into an archive named after
# the machine this script is currently running on:
#    --filter AME                                \
#    --stats                                     \


${BORG} create                                     \
    --verbose                                   \
    --list                                      \
    --filter AME                                \
    --show-rc                                   \
    --exclude-from exclusions                   \
    --compression lz4                           \
    --exclude-caches                            \
                                                \
    ::'{hostname}-{now}'                 \
    ${BORG_PATHS}

backup_exit=$?
#backup success with exit status of zero
if [ ${backup_exit} -eq 0 ]
then 
    ${ZSENDER} -v -z ${ZABBIXHOST} -s ${HOST} -k ${ZABBIXSTATUS} -o 0
    ${BORG} info --last 1 --json | ${JQ} -c |${JQ} -R |xargs -0 printf "${HOST} ${ZABBIXITEM} %s" | ${ZSENDER} -v -z ${ZABBIXHOST} -i -
else
    ${ZSENDER} -v -z ${ZABBIXHOST} -s ${HOST} -k ${ZABBIXSTATUS} -o 1
fi


info "Pruning repository"

# Use the `prune` subcommand to maintain 7 daily, 4 weekly and 6 monthly
# archives of THIS machine. The '{hostname}-' prefix is very important to
# limit prune's operation to this machine's archives and not apply to
# other machines' archives also:

/usr/local/bin/borg prune                          \
    --list                          \
    --show-rc                       \
    --keep-daily    30               \
    --keep-weekly   8               \
    --keep-monthly  12               \

prune_exit=$?
#prune_exit=0

# use highest exit code as global exit code
global_exit=$(( backup_exit > prune_exit ? backup_exit : prune_exit ))

if [ ${global_exit} -eq 1 ];
then
    info "Backup and/or Prune finished with a warning"
fi

if [ ${global_exit} -gt 1 ];
then
    info "Backup and/or Prune finished with an error"
fi

exit ${global_exit}