#!/bin/bash

#
# Script configuration
#

script_dir=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
set -o allexport
source ${script_dir}/config/system_backup
set +o allexport

export BORG_REPO=$MOUNTPOINT/borg/backups

DATE=$(date -u +%Y-%m-%d-%H-%M)


#
# Create backups
#

# Options for borg create
BORG_OPTS="--stats --compression lz4 --one-file-system --checkpoint-interval 86400"

# No one can answer if Borg asks these questions, it is better to just fail quickly
# instead of hanging.
export BORG_RELOCATED_REPO_ACCESS_IS_OK=no
export BORG_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK=no

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

borg --version

info "Starting backup for $DATE"

borg create $BORG_OPTS        \
  --verbose                   \
  --filter AME                \
  --list                      \
  --stats                     \
  --show-rc                   \
  --compression lz4           \
  --exclude-caches            \
  --exclude 'root/.cache'     \
  --exclude 'home/*/.cache/*' \
  --exclude 'var/tmp/*'       \
  ::'{hostname}-debian-{now}' \
  /home /root /etc /var

backup_exit=$?


info "Pruning repository"

borg prune                                 \
    --list                                 \
    --glob-archives '{hostname}-debian-*'  \
    --show-rc                              \
    --keep-daily    7                      \
    --keep-weekly   4                      \
    --keep-monthly  6

prune_exit_1=$?

borg prune                                 \
    --list                                 \
    --glob-archives '{hostname}-trident-*' \
    --show-rc                              \
    --keep-daily    7                      \
    --keep-weekly   4                      \
    --keep-monthly  6

prune_exit_2=$?
prune_exit=$(( prune_exit_2 > prune_exit_1 ? prune_exit_2 : prune_exit_1 ))


info "Compacting repository"

borg compact

compact_exit=$?


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

if [ ${global_exit} -eq 0 ]; then
    info "Backup, Prune, and Compact finished successfully"
elif [ ${global_exit} -eq 1 ]; then
    info "Backup, Prune, and/or Compact finished with warnings"
else
    info "Backup, Prune, and/or Compact finished with errors"
fi

exit ${global_exit}