#!/bin/bash

# NFS server for Raspbian 
#
# 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!
#
# Usage:
# 
#   ./installer.sh NFS.sh <IP> (<img>)
#
# See installer.sh instructions for details
# More at: https://ownyourbits.com
#

ACTIVE_=no
DIR_=/media/USBdrive/ncdata/admin/files
SUBNET_=192.168.1.0/24
USER_=www-data
GROUP_=www-data
DESCRIPTION="NFS network file system server (for Linux LAN)"

install()
{
  apt-get update
  apt-get install --no-install-recommends -y nfs-kernel-server 
  systemctl disable nfs-kernel-server

  cat > /etc/systemd/system/nfs-common.services <<EOF
[Unit]
Description=NFS Common daemons
Wants=remote-fs-pre.target
DefaultDependencies=no

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/etc/init.d/nfs-common start
ExecStop=/etc/init.d/nfs-common stop

[Install]
WantedBy=sysinit.target
EOF

  cat > /etc/systemd/system/rpcbind.service <<EOF
[Unit]
Description=RPC bind portmap service
After=systemd-tmpfiles-setup.service
Wants=remote-fs-pre.target
Before=remote-fs-pre.target
DefaultDependencies=no

[Service]
ExecStart=/sbin/rpcbind -f -w
KillMode=process
Restart=on-failure

[Install]
WantedBy=sysinit.target
Alias=portmap
EOF
}

show_info()
{
  whiptail --yesno \
           --backtitle "NextCloudPi configuration" \
           --title "Instructions for external synchronization" \
"If we intend to modify the data folder through NFS,
then we have to synchronize NextCloud to make it aware of the changes. \n
This can be done manually or automatically using 'nc-scan' and 'nc-scan-auto' 
from 'nextcloudpi-config'" \
  20 90
}

configure()
{
  [[ $ACTIVE_ != "yes" ]] && { 
    service nfs-kernel-server stop
    systemctl disable nfs-kernel-server
    echo -e "NFS disabled"
    return
  } 

  # CHECKS
  ################################
  [ -d "$DIR_" ] || { echo -e "INFO: directory $DIR_ does not exist. Creating"; mkdir -p "$DIR_"; }
  [[ $( stat -fc%d / ) == $( stat -fc%d $DIR_ ) ]] && \
    echo -e "INFO: mounting a in the SD card\nIf you want to use an external mount, make sure it is properly set up"

  # CONFIG
  ################################
  cat > /etc/exports <<EOF
$DIR_ $SUBNET_(rw,sync,all_squash,anonuid=$(id -u $USER_),anongid=$(id -g $GROUP_),no_subtree_check)
EOF

  systemctl enable rpcbind
  systemctl enable nfs-kernel-server
  service nfs-kernel-server restart
  echo -e "NFS enabled"
}

cleanup()
{
  apt-get autoremove -y
  apt-get clean
  rm /var/lib/apt/lists/* -r
}

# 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