#!/bin/bash

# Flags based on
#  https://borgbackup.readthedocs.io/en/stable/quickstart.html

if [ -z "$1" ]; then
    echo "Must specify backup host"
    exit 1
fi

BORG="/opt/borg/bin/borg"

# Setting this, so the repo does not need to be given on the commandline:
export BORG_REPO="ssh://{{ borg_username}}@${1}/opt/backups/{{ borg_username }}/backup"

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

info "Starting backup"

# This avoids UI prompts when first accessing the remote repository
export BORG_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK=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 lz4               \
    --exclude-caches                \
{% for item in borg_backup_excludes + borg_backup_excludes_extra -%}
    --exclude '{{ item }}'          \
{% endfor -%}
                                    \
    ::'{hostname}-{now}'            \
{% for item in borg_backup_dirs + borg_backup_dirs_extra -%}
    {{ item }} {{ '\\' if not loop.last }}
{% endfor -%}

backup_exit=$?

if [ ${backup_exit} -eq 0 ]; then
    info "Backup finished successfully"
else
    info "Backup finished with errors"
fi

exit ${backup_exit}