Ubuntu – How to run a script, depending on internet connection

networkingsshfs

I often mount a remote drive using sshfs. I would love to have this mount automatically. However, if I mount it in my .bashrc or startup scripts, the mount often fails because my wireless internet connection has not yet been made.

Does anybody know of an easy way to execute a bash scrip every time the connection is made, or to auto-mount an sshfs drive?

Best Answer

Add your script to /etc/network/if-up.d/. Name your script without a '.sh' extension.

Also after adding script run chmod +x /etc/network/if-up.d/yourscriptname to give necessary permission.

Make sure the network interface (e.g. wlan0 or eth0) that should trigger your script when turned on is mentioned in the file /etc/network/interfaces.

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Find the UUID of your connection using

$ nmcli con

Note that this lists not just physical connections but also the Wireless connections defined (SSIDs).

Put some simple script like this in your /etc/NetworkManager/dispatcher.d/ directory:

#!/bin/bash

# Specify your connection UUID you like to trigger on below.
MYCON_UUID=397bdb70-2a89-415e-b3e9-09ca0b704fc1

if [ "$CONNECTION_UUID" == "$MYCON_UUID" ]
then
    # do your scripting you need to do here:
    mount -t sshfs ...
fi

Don't forget to set the right permissions to make it excutable (i.e. chmod +x trigger-sshfs-on-vpn.sh). It can be any type of script, a Bash script is probably sufficient for your purpose.

NetworkManager just executes all the scripts in this directory providing some environment variables you can use for scripting. In this case you probably just need CONNECTION_UUID.

Best Answer

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