#!/bin/bash

set -e

RESTIC_PASSWORD="{{ passphrase }}"
RESTIC_REPOSITORY_BASE=sftp:{{ server }}:{{ backup_path }}
RESTIC_COMMAND=/usr/local/bin/restic

do_need_mount() {
    work_dir="$1"
    name="$2"
    repo="$3"
    size="$4"
    description="$5"
    export RESTIC_PASSWORD
    export RESTIC_REPOSITORY=${RESTIC_REPOSITORY_BASE}/$name

    # On essaie de lister les snapshots, sinon on initialise le depot
    $RESTIC_COMMAND list snapshots || $RESTIC_COMMAND init
}

do_backup() {

    work_dir="$1"
    name="$2"
    repo="$3"
    size="$4"
    description="$5"
    export RESTIC_PASSWORD
    export RESTIC_REPOSITORY=${RESTIC_REPOSITORY_BASE}/$name
    LOGFILE=/var/log/restic_backup.log
    ERRFILE=/var/log/restic_backup.err
    current_date=$(date +"%d_%m_%y_%H:%M")
    pushd $work_dir
    $RESTIC_COMMAND backup ./ >> $LOGFILE 2>> $ERRFILE
    backup_return_code="$?"
    popd

    # On ne nettoie que si la sauvegarde s'est bien passee
    if [ "$backup_return_code" -eq "0" ];then
        $RESTIC_COMMAND forget --keep-daily 7 --keep-weekly 8 --keep-monthly 12 >> $LOGFILE 2>> $ERRFILE
    else
        echo "Something went wrong during backup" >> $ERRFILE
        exit 1
    fi
}

work_dir=$2
name=$3

size=$5
description=$6

case "$1" in
  need_mount)
    do_need_mount $work_dir $name $repo $size $description
    ;;
  backup)
    do_backup $work_dir $name $repo $size $description
    ;;
  mount)
    do_need_mount $work_dir $name $repo $size $description
    ;;
  *)
    echo "hook called with unknown argument \`$1'" >&2
    exit 1
    ;;
esac

exit 0