#!/bin/bash


# Desktop notification
  function notify() {
    if [ -x "$(command -v notify-send)" ]; then
      # https://stackoverflow.com/questions/28195805/running-notify-send-as-root/49533938#49533938
      local display=":$(ls /tmp/.X11-unix/* | sed 's#/tmp/.X11-unix/X##' | head -n 1)"
      local uid=$(id -u caspervk)
      sudo -u caspervk DISPLAY=$display DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/$uid/bus notify-send --expire-time=0 --icon=backup "$@"
    fi
  }

notify "Borgbackup: Started"

# Avoid UnicodeError
export LANG=en_US.UTF-8

# Ask an external program to supply the repository passphrase:
export BORG_PASSCOMMAND='cat /usr/local/etc/borg/passphrase.key'

# When running Borg using an automated script, ssh might still ask for a password, even if there is an SSH key for
# the target server. Use this to make scripts more robust:
export BORG_RSH='ssh -oBatchMode=yes'

# Set repository location
# Note: because of the way the server is set up, the repo resides in `/home/borg/repos/<hostname>/` on the server.
export BORG_REPO=ssh://borg@sigma.caspervk.net:222/./auto-full

# Initialize remote repository (doesn't matter if it already is).
borg init --encryption=repokey-blake2

# Backup directories into an archive named after the machine and current utc time.
# Patterns:
#  A backup root (starting point) path starts with the prefix R, followed by a path.
#  An include rule starts with the prefix +.
#  An exclude rule starts with the prefix -.
#  An exclude-norecurse rule starts with !.
borg create                                                                           \
    --filter AME                                                                      \
    --show-rc                                                                         \
    --stats                                                                           \
    --compression zstd                                                                \
    --remote-ratelimit 0                                                              \
    --exclude-caches                                                                  \
                                                                                      \
    --pattern '! /dev'                                                                \
    --pattern '! /proc'                                                               \
    --pattern '! /sys'                                                                \
    --pattern '! /var/run'                                                            \
    --pattern '! /var/tmp'                                                            \
    --pattern '! /run'                                                                \
    --pattern '! /tmp'                                                                \
    --pattern '! /lost+found'                                                         \
    --pattern '! /var/cache'                                                          \
    --pattern '! /**/found.000/*'                                                     \
    --pattern '! /mnt'                                                                \
                                                                                      \
    --pattern '! /home/*/.steam'                                                      \
    --pattern '! /home/*/GOG Games'                                                   \
    --pattern '! /home/*/.cache'                                                      \
    --pattern '! /home/*/Downloads'                                                   \
    --pattern '! /home/*/.local/share/Trash'                                          \
                                                                                      \
    --pattern '+ /media/caspervk/C/Users/Casper/Desktop'                              \
    --pattern '+ /media/caspervk/C/Program Files (x86)/World of Warcraft/_classic_'   \
    --pattern '- /media'                                                              \
                                                                                      \
    --pattern '- /media/caspervk/Backup/Downloads'                                    \
    --pattern '- /media/caspervk/Backup/monero'                                       \
    --pattern '- /media/caspervk/Backup/Programmer/VirtualBox'                        \
    --pattern '+ /media/caspervk/Backup'                                              \
    ::'{hostname}-{utcnow}'                                                           \
    /
backup_exit=$?

# Use the `prune` subcommand to maintain 7 daily, 4 weekly and 6 monthly archives:
# Note that as the repo is append-only, prune won’t free disk space, but merely tag data as deleted in a new
# transaction. As soon as we write to the repo in non-append-only mode (e.g. prune, delete or create archives from an
# admin machine), it will remove the deleted objects permanently (including the ones that were already marked as
# deleted, but not removed, in append-only mode).
borg prune             \
    --list             \
    --show-rc          \
    --keep-daily    7  \
    --keep-weekly   4  \
    --keep-monthly  6
prune_exit=$?

notify "Borgbackup: Finished"

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