#!/bin/sh

backup_name=systemonly
backup_dir=/backups/borg/$backup_name/
log_dir=/backups/log/
unique_identifier=Manjaro18

#########################################################################

readonly backup_name
readonly backup_dir
readonly log_dir
readonly unique_identifier

# Setting this, so you won't be asked for your repository passphrase:
export BORG_PASSPHRASE='d00x^UXryuEYTwPuZwQh'

# Setting this, so the repo does not need to be given on the commandline:
export BORG_REPO=$backup_dir

# some helpers and error handling:
log_file=$log_dir$backup_name-$(date +%d%m%Y-%H%M%S)
readonly log_file

# if borg is currently running - stop sync
if [ $(pidof borg | wc -w) -eq 1 ]
then
  echo "Another Backup is currently running. Exiting." >> $log_file 2>&1
  exit 2
fi

info() { printf "\n%s %s\n\n" "$( date )" "$*" >> $log_file 2>&1; }
trap 'echo $( date ) Backup interrupted >> $log_file 2>&1; exit 2' INT TERM

info "Starting backup" >> $log_file 2>&1

# Backup the most important directories into an archive named after
# the machine this script is currently running on:

borg create                                             \
    --verbose                                           \
    --filter AME                                        \
    --list                                              \
    --stats                                             \
    --show-rc                                           \
    --compression zstd,1                                \
    --exclude-caches                                    \
    --exclude '/home/*/.cache/*'                        \
    --exclude '/home/*/.local/share/Trash/*'            \
    --exclude '/home/pratik/Downloads/Videos/*'         \
    --exclude '/home/pratik/Downloads/Study/Video/*'    \
    --exclude '/var/cache/*'                            \
    --exclude '/var/tmp/*'                              \
    --exclude "$backup_dir"                             \
    --exclude "$log_file"                               \
                                                        \
    ::"$unique_identifier-$backup_name-{now}"           \
    /etc                                                \
    /root                                               \
    /var                                                \
    >> $log_file 2>&1                                   \

backup_exit=$?

info "Pruning repository" >> $log_file 2>&1

# 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                                       \
    --stats                                      \
    --prefix "$unique_identifier-$backup_name-"  \
    --show-rc                                    \
    --keep-within 2d                             \
    --keep-last 5                                \
    --keep-daily 7                               \
    >> $log_file 2>&1                            \

prune_exit=$?

# 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" >> $log_file 2>&1
fi

if [ ${global_exit} -gt 1 ];
then
    info "Backup and/or Prune finished with an error" >> $log_file 2>&1
fi

exit ${global_exit}