#!/bin/bash

# Set mode
if [ "$1" = "auto" ]; then
    mode="auto"
else
    mode="man"
fi

# Read environment variables
source "${HOME}/.borg-env"

# some helpers and error handling:
info() {
    printf "\n%s %s\n\n" ${DATE} "$*" >&2;
    echo "$( date ) BORGBACKUP $* " >> /var/log/backup.log;
}

trap 'echo $( date ) Backup interrupted >&2; exit 2' INT TERM

info "Starting backup"

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

/usr/local/bin/borg create          \
    --verbose                       \
    --filter AME                    \
    --list                          \
    --stats                         \
    --show-rc                       \
    --compression lz4               \
    --exclude-caches                \
                                    \
    ::"${mode}-{hostname}-{now}"    \
    "${BORG_TARGETS[@]}"            \

backup_exit=$?

if [ $mode = "auto" ]; then

    info "Pruning repository"

    # 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:

    /usr/local/bin/borg prune           \
        --list                          \
        --glob-archives 'auto-*'        \
        --show-rc                       \
        --keep-daily    7               \
        --keep-weekly   4               \
        --keep-monthly  6               \
        --keep-yearly   2               \

    prune_exit=$?

    # actually free repo disk space by compacting segments

    info "Compacting repository"

    /usr/local/bin/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 ))

else
    global_exit=$(( compact_exit > global_exit ? compact_exit : global_exit ))
fi

if [ ${global_exit} -eq 0 ]; then
    info "Borg Backups finished successfully"
elif [ ${global_exit} -eq 1 ]; then
    info "Borg Backups finished with warnings"
else
    info "Borg Backups finished with errors"
fi
exit ${global_exit}