#!/bin/bash

#
# NextCloudPi scheduled datadir BTRFS snapshots 
#
# Copyleft 2017 by Ignacio Nunez Hernanz <nacho _a_t_ ownyourbits _d_o_t_ com>
# GPL licensed (see end of file) * Use at your own risk!
#
# More at https://ownyourbits.com/2017/02/13/nextcloud-ready-raspberry-pi-image/
#

ACTIVE_=no
DESCRIPTION="Scheduled datadir BTRFS snapshots"

install()
{
  wget https://raw.githubusercontent.com/nachoparker/btrfs-snp/master/btrfs-snp -O /usr/local/bin/btrfs-snp
  chmod +x /usr/local/bin/btrfs-snp
}

configure()
{ 
  [[ $ACTIVE_ != "yes" ]] && { 
    rm /etc/cron.hourly/btrfs-snp
    echo "automatic snapshots disabled"
    return 0
  }

  local DATADIR MOUNTPOINT
  DATADIR=$( sudo -u www-data php /var/www/nextcloud/occ config:system:get datadirectory ) || {
    echo -e "Error reading data directory. Is NextCloud running and configured?";
    return 1;
  }

  # file system check
  MOUNTPOINT="$( stat -c "%m" "$DATADIR" )" || return 1
  [[ "$( stat -fc%T "$MOUNTPOINT" )" != "btrfs" ]] && {
    echo "$MOUNTPOINT is not in a BTRFS filesystem"
    return 1
  }

  cat > /etc/cron.hourly/btrfs-snp <<EOF
#!/bin/bash
/usr/local/bin/btrfs-snp $MOUNTPOINT hourly  24 3600    ../ncp-snapshots
/usr/local/bin/btrfs-snp $MOUNTPOINT daily    7 86400   ../ncp-snapshots
/usr/local/bin/btrfs-snp $MOUNTPOINT weekly   4 604800  ../ncp-snapshots
/usr/local/bin/btrfs-snp $MOUNTPOINT monthly 12 2592000 ../ncp-snapshots
EOF
  chmod +x /etc/cron.hourly/btrfs-snp
  echo "automatic snapshots enabled"
}


# License
#
# This script is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This script is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this script; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place, Suite 330,
# Boston, MA  02111-1307  USA