#!/bin/bash

##
## Save backup to directory named after hostname
##

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
DIR_DATA=$DIR"/data"

# load config
. $DIR/config

LOG=$DIR"/backup.log"
export BORG_REPO=$REPOSITORY
export BORG_PASSPHRASE=$PASSPHRASE
export BORG_RSH="ssh -i $DIR/id_backup"

##
## Write output to logfile
##

exec > >(tee -i ${LOG})
exec 2>&1

# some helpers and error handling:
info() { printf "\n%s %s\n\n" "$( date )" "$*" >&2; }
trap 'echo $( date ) Backup interrupted >&2; exit 2' INT TERM

echo "###### Starting backup on $(date) ######"

. $DIR/before.sh

##
## Sync backup data
##

echo "Syncing backup files ..."
borg create 						\
	--verbose 					\
	--filter AME 					\
	--list						\
	--stats				                \
	--show-rc					\
	--compression lz4				\
	--exclude-caches                		\
	--exclude '/home/*/.cache/*'    		\
    	--exclude '/var/cache/*'        		\
    	--exclude '/var/tmp/*'			        \
                                    			\
    	::'{hostname}-{now}' 	        		\
    	/etc                                            \
    	/home	                                        \
     	/root   	                                \
   	/var    	                                \
	$DIR_DATA					\
    	/media/data/live

backup_exit=$?

echo "###### Finished backup on $(date) ######"

echo "###### Pruning repository on $(date) ######"

# 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:

borg prune                          \
    --list                          \
    --prefix '{hostname}-'          \
    --show-rc                       \
    --keep-daily    7               \
    --keep-weekly   4               \
    --keep-monthly  6               \

prune_exit=$?

echo "###### Finished pruning on $(date) ######"

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

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

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

. $DIR/after.sh

exit ${global_exit}