#! /bin/bash


# (c) Copyright 2010  Christoph Jahn  <christoph.jahn@gmx.de>
# http://www.christoph-jahn.com



# NAME
#     mount_noauto.sh - Mount file systems that are not 
#                       automatically mounted
#
#
# SYNOPSIS
#
#     mount_noauto.sh [-u]
#
#        OPTIONS     -u   Perform umount instead of mount
#
#
# DESCRIPTION
#     There may be situations when you have network mounts that
#     should not be done automatically on system startup. 
#     E.g. you are working on a laptop and are not always 
#     connected to the relevant server(s). In this case you 
#     probably want to set the respective entries in /etc/fstab
#     to noauto. But now you have to manually call mount for 
#     each entry, once you are connected to the server.
#
#     This script helps you here by going over all the entries
#     from /etc/fstab and call mount where appropriate.
#
#     Only those lines will be processed where the file system
#     type is matching one of the entries in the FS_SUPPORTED_LIST
#     variable. Also, if the mount point is already used, the
#     entry will be skipped.
#
#     There is currently no check as to whether the server is
#     reachable. So you may run into time-outs and mount errors 
#     for entries, where there is currently no connection to 
#     the server.
#
#     CAUTION: So far this has only been used on Fedora 12 
#              with CIFS mounts
#
# PLANNED CHANGES
#     - NEW: Ping server before trying to mount


# List of file system types that should be considered, others will skipped
FS_SUPPORTED_LIST="smb cifs nfs nfs4"



# Read from this file
CFG_FILE=/etc/fstab


PRG=`basename $0`

# Initialize mount/umount flag; by default we try to mount
UMOUNT=0

while getopts 'u' OPTION
do
    case $OPTION in
	u)  UMOUNT=1
	    ;;
	?)  echo "Wrong option"
	    echo $"Usage: $PRG         mount network drives"
	    echo $"       $PRG -u      umount network drives"
	    exit 1
	    ;;
    esac
done
shift $(($OPTIND - 1))

# Do we do a mount or umount? Set internal params accordingly
if [ $UMOUNT = 0 ]; then
    MOUNT_CMD=mount
    MOUNT_GREP_RC=1
    SKIP_MSG="already mounted"
else
    MOUNT_CMD=umount
    MOUNT_GREP_RC=0
    SKIP_MSG="not mounted"
fi

# Read config file line by line
while read line; do 

    # Skip empty and comment lines
    if [ -n "$line" ]; then
	# Non-empty line, check for comment
	NO_COMMENT=`echo $line | grep -e "^#.*" > /dev/null;echo $?`
    else
	# Empty line, always skip
	NO_COMMENT=0
    fi
    
    if [ $NO_COMMENT -eq 1 ]; then

	# Determine file system type
	FS=`echo $line | awk '{ print $3 }'`
	
	# Supported FS type?
	FS_SUPPORTED=`echo $FS_SUPPORTED_LIST | grep  -v $FS > /dev/null; echo $?`

	# Only process supported file systems
	if [ $FS_SUPPORTED -eq 1 ]; then

	    # Determine network path and local mount point
	    SERVER_SHARE=`echo $line | awk '{ print $1 }'`
	    MOUNTPOINT=`echo $line | awk '{ print $2 }'`

	    # Check if mountpoint already in use. This is safer than
	    # checking for the "normal" server/share because it is
	    # possible that something else has been mounted there by mistake.
	    SHARE_MOUNTED_RC=`mount -t $FS | grep $MOUNTPOINT > /dev/null; echo $?`

	    # Perform actual mount/umount operation
	    if [ $SHARE_MOUNTED_RC -eq $MOUNT_GREP_RC ]; then
		echo "$MOUNT_CMD : $MOUNTPOINT"
		$MOUNT_CMD $MOUNTPOINT
	    else
		echo "Skipped $MOUNT_CMD of $MOUNTPOINT : $SKIP_MSG"
	    fi
	fi
    fi
done < $CFG_FILE