Intro

I use my Pi as mediacenter with xbmc and I wanted a simple way to dynamically mount Samba Shares from my Windows computers when they are up and running. So I quickly fixed up a bash script to run via cron that checks if a server IP is online and mounts/unmounts accordingly.

Requirements

The script uses mountpoint which is provided on Arch by util-linux, udevil and cifs-utils to mount smb shares. Don’t forget to set cifs as an allowed type in /etc/udevil/udevil.conf.

The Script

Downloadable from here.

#!/bin/bash
#Original Script by winlu <derwinlu AT gmail DOT com> from winlu.mooo.com


if [ $# -ne "2" ]; then
    echo Usage: $0 SERVER_IP SHARES
    exit 1
fi

SERVER_IP=$1
SHARES=$2

OPTIONS='credentials=/media/.smbcred'

ping -c 1 $SERVER_IP &>/dev/null
if [ $? -ne 0 ]; then
    # server is down so unmount
    #
    # if we query the mount point and it was previously mounted, the script freezes
    # so just unmount forcing while lazy
    for MNT in $SHARES; do
        udevil unmount -l -f //$SERVER_IP/$MNT &>/dev/null
    done
else
    # server is up
    #
    # check if mount point is live and try to mount if not
    for MNT in $SHARES; do
        mountpoint -q /media/smb-$SERVER_IP-$MNT || udevil mount -o $OPTIONS smb://$SERVER_IP/$MNT &>/dev/null
    done
fi

Installation

I use cron entries similar to this one:

*/5 * * * * /media/networkMount.sh 192.168.0.10 "Cloud Music"

This tries to execute the script located at /media/networkMount.sh which then tries to connect to 192.168.0.10 every 5 minutes to mount the shares Cloud and Music.

The script also uses a credentials file with the following structure:

> cat /media/.smbcred
username=smbuser
password=smbpassword

Be sure to create one yourself and make it only accessable by root with

> touch /media/.smbcred
> chmod 600 /media/.smbcred

- winlu