#!/bin/bash
# -------
# File:        netmount
# Description: LliureX init script to mount network shares
#              This script replaces old llxcfg netfstab
# Author:      Luis Garcia Gisbert <garcia_luigis@gva.es>
#
# This program 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 program 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 program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin St, Fifth Floor, Boston MA 02110-1301 USA
# --------

set -e

# PATH & variables
PATH="/sbin:/bin:/usr/sbin:/usr/bin"

# Funcs
info_message(){
   printf "netmount: $1"
}

error_message(){
   echo -e "netmount: $1" >&2
}

is_mounted(){
   if mount |grep -q "^${1}\b" ; then
      return 0
   fi
   return 1
}

mount_share(){
   if is_mounted "$1" ; then
      info_message "Skipping already mounted \"$1\"\n"
      return 0
   fi
   net_fs="$1"
   net_mntpoint="$2"
   net_fstype="$3"
   net_mntopt="$4"

   info_message "Mounting \"$net_fs\" ... "
   if [ ! -d "$net_mntpoint" ] ; then
      if ! mkdir -p "$net_mntpoint" >/dev/null 2>/dev/null ; then
         info_message "FAILED\n"
         error_message "Unable to create mount point \"$net_mntpoint\""
         return 1
      fi
   fi
   if ! mount -s -o "$net_mntopt" -t "$net_fstype" "$net_fs" "$net_mntpoint" >/dev/null 2>/dev/null ; then
      info_message "FAILED.\n"
      error_message "Unable to mount \"$net_fstype\" filesystem in \"$net_mntpoint\""
      # Requesting keytab file for the right lliurex flavor
      n4d-client -h server -m get_keytabs -c KrbManager -a `python /usr/share/n4d/python-plugins/LliurexVersion.py`
      # Done
      return 1
   
   fi
   info_message "[OK]\n"
   return 0
}

umount_share(){
   if ! is_mounted "$1" ; then
      info_message "\"$1\" not mounted. Nothing to do.\n"
      return 0
   fi
   info_message "Umounting \"$1\" ... "
   if ! umount -l -f "$1" >/dev/null 2>/dev/null ; then
      info_message "FAILED\n"
      return 1
   fi
   info_message "[OK]\n"
   return 0
}  

net_shares(){
   local ACTION
   ACTION="$1"
   REGEXP_RAMON="/^\([^[:blank:]]\+[[:blank:]]\+\)\{3\}[01]\?[0-7]\{3\}[[:blank:]]\+[^[:blank:],]\+\(,[^,]\+\)*/p"
   VALIDATE_REGEXP="^\([^[:blank:]#]\+[[:blank:]]\+\)\{3\}[^[:blank:]]\+"
   llxcfg-config dump netmount |sed -ne "/${VALIDATE_REGEXP}/p" |while read net_fs net_mntpoint net_fstype net_mntopt net_extra ; do
      case $ACTION in
         mount)
	    initctl emit mounting TYPE="nfs4" OPTIONS="sec,krb5"
	    export KRB5_KTNAME
            mount_share "$net_fs" "$net_mntpoint" "$net_fstype" "$net_mntopt" || true
            ;;
         umount)
            umount_share "$net_mntpoint" || true
            ;;
         *)
            error_message "Unknown action \"$ACTION\""
            return 1
            ;;
      esac
   done
   return 0
}

# main

case "$1" in
   start)
      net_shares mount
      ;;
   stop)
      net_shares umount
      ;;
   *)
      error_message "Usage: $0 {start|stop}" >&2
      exit 1
      ;;
esac

exit 0