#!/usr/bin/env bash

set -e

if [[ "$HOME" == "/" || -z "$HOME" ]] ; then
  HOME="/root/"
fi

HOME=${HOME:-"/root/"}

PERSONALCONFIG="${1:-$HOME/.config/borg.conf}"

BORGHOST=""
USER=""
REPO=""
MAC=""
BORG_PASSPHRASE=""
BORG_EXCLUDE_FILE=""
BORG_EXCLUDE_IF_PRESENT=".do_not_backup_this_directory"
BORG_EXCLUDE_PATTERN=("/var/cache/*"
                      "/var/tmp/*"
                     )
BORG_BACKUP_DIRS=(
                  "/etc"
                  "/var"
                  "/home"
                  "/usr/local"
		  )

APPENDONLY="YES" #unset if not used
BORG_PRUNEARG=("--keep-daily=7" "--keep-weekly=4" "--keep-monthly=12")
MYREPO=${USER}@${BORGHOST}:${REPO}
BORG_ARGS=()

if [[ -e "$PERSONALCONFIG" ]] ; then
  ls -l "$PERSONALCONFIG"
  #shellcheck disable=SC1090
  source "$PERSONALCONFIG"
else
  echo "$PERSONALCONFIG not found"
fi


MYREPO="${USER}@${BORGHOST}:${REPO}"


export BORG_PASSPHRASE
export HOME

SNAPSHOT="${SNAPSHOT:-"$(hostname -f) $(date "+%Y-%m-%d %a %H:%M")"}"

echo "using repo: $MYREPO snapshot: $SNAPSHOT"

echo #### borg backup ####
if [[ -n "${MAC}" ]] ; then
  if ! ping -c 1 "$BORGHOST" &> /dev/null ; then
    wakeonlan "$MAC"
    #wakup may take some time
    sleep 10
  else
    echo "$BORGHOST is up"
  fi
fi

set +e
#wordsplitting is needed for arguments
#shellcheck disable=SC2046
nice ionice -c 3 borg create --stats \
                             --exclude-caches \
                             --one-file-system \
                             "${BORG_ARGS[@]}" \
                             $([[ -n "${BORG_EXCLUDE_PATTERN[*]}" ]] && printf " --exclude \"%s\" " "${BORG_EXCLUDE_PATTERN[@]}" ) \
                             $([[ -n "$BORG_EXCLUDE_FILE" ]] && printf " --exclude-from \"%s\" " "${BORG_EXCLUDE_FILE}" ) \
			     --exclude-if-present="$BORG_EXCLUDE_IF_PRESENT" \
			     --exclude-if-present=".nobackup" \
                             "${MYREPO}::${SNAPSHOT}" \
                             "${BORG_BACKUP_DIRS[@]}"

RetVal=$?

echo "RetVal = $RetVal"

if [[ $RetVal != "0" && $RetVal != "1" ]] ; then
  exit "$RetVal"
fi

set -e

if [[ "${APPENDONLY}" != "YES" ]] ; then 
  time borg prune -v "$MYREPO" "${BORG_PRUNEARG[@]}"

  echo RetVal = $?
  
  time borg list -v $MYREPO
  echo RetVal = $?
else
  echo #############
  echo You should purge the repository from time to time
fi

echo ##### borg end ######