#!/bin/sh
# vim: set ts=2 sw=2 et:

set -u
set -e

APP_DOKKU_ROOT=/home/dokku
APP_VOLUMES_ROOT=/var/lib/dokku/data/storage
APP_SERVICE_ROOT=/var/lib/dokku/services

if [ -r /etc/duplicity/config ]; then
  . /etc/duplicity/config
else
  echo "Unable to read config file"
fi
DUPLICITY_HOSTNAME="${DUPLICITY_HOSTNAME:-}"
DUPLICITY_WORK_DIR="${DUPLICITY_WORK_DIR:-}"
DUPLICITY_ENABLE="${DUPLICITY_ENABLE:-}"

make_archive() {
  app="$1"
  dir="$2"
  age="7D"

  echo "Creating backup for $app..."
  echo "- data dir $dir"

  if [ ! -d "$dir" ]; then
    >&2 echo "ERROR: missing data dir $dir"
    exit 1
  fi
  if [ "$DUPLICITY_ENABLE" != "true" ]; then
    echo "- dryrun mode (skipping the real work)"
    return
  fi
  duplicity \
    --file-prefix-manifest "hot_${app}_" \
    --file-prefix-signature "hot_${app}_" \
    --file-prefix-archive "cold_${app}_" \
    --full-if-older-than "$age" \
    "$dir" \
    'multi:///root/.duplicity/config.json?mode=mirror&onfail=abort'
}

clean_archive() {
    age="1D"
    echo "Removing old backups (> $age)"
    if [ "$DUPLICITY_ENABLE" != "true" ]; then
      echo "- dryrun mode (skipping the real work)"
      return
    fi
    duplicity \
            remove-older-than "$age" \
            --force 'multi:///root/.duplicity/config.json?mode=mirror&onfail=abort'
}

## VALIDATE INPUT

if [ -z "$DUPLICITY_HOSTNAME" ]; then
  >&2 echo "ERROR: Variable DUPLICITY_HOSTNAME must be declared in /etc/duplicity/config"
  exit 1
fi

if [ -z "$DUPLICITY_WORK_DIR" ]; then
  >&2 echo "ERROR: Variable DUPLICITY_WORK_DIR must be declared in /etc/duplicity/config"
  exit 1
fi

PASSPHRASE="$(cat /etc/duplicity/gpg_backup_passphrase)"
TMPDIR="$DUPLICITY_WORK_DIR"
# /mnt/one.data.infra.glenux.net/duplicity

export PASSPHRASE
export TMPDIR


## DOKKU DATA
for app in $( dokku apps:list |tail -n+2 |xargs echo ) ; do
  NAME="DOKKU_${app}@${DUPLICITY_HOSTNAME}"
  DATA_DIR="$APP_DOKKU_ROOT/$app"

  make_archive "$NAME" "$DATA_DIR"
done

## VOLUMES DATA
for app in $( dokku apps:list |tail -n+2 |xargs echo ) ; do
  NAME="VOLUMES_${app}@${DUPLICITY_HOSTNAME}"
  DATA_DIR="$APP_VOLUMES_ROOT/$app"

  make_archive "$NAME" "$DATA_DIR"
done

## MARIADB DATA 
for app in $( dokku mariadb:list |tail -n+2 |awk '{ print $1; }' |xargs echo ) ; do
  NAME="MARIADB_$(dokku mariadb:list |grep "^$app " |awk '{ print $1 "@" $5; }')"
  DATA_DIR="$APP_SERVICE_ROOT/mariadb/$app"

  make_archive "$NAME" "$DATA_DIR"
done

## POSTGRES DATA 
for app in $( dokku postgres:list |tail -n+2 |awk '{ print $1; }' |xargs echo ) ; do
  NAME="POSTGRES_$(dokku postgres:list |grep "^$app " |awk '{ print $1 "@" $5; }')"
  DATA_DIR="$APP_SERVICE_ROOT/postgres/$app"

  make_archive "$NAME" "$DATA_DIR"
done

clean_archive