osx snow leopard - Unmount a volume as soon as its inserted if its name is "XYZ"

I have a USB modem which is mounted as say XYZ(which contains the Dialer Software and Readme) when its inserted. In order to connect using it, I have to eject it and then connect it using ppp dialer.

Let us say that it mounts under the name /Volumes/XYZ

I want to do something like if I insert a USB device and it mounts under the name XYZ, I want it to be ejected immediately.

How do I do that?

Answer

I did something similar once upon a time, where whenever a drive named a certain way was mounted, a script immediately fired off to sync the contents of a set of folders to the drive.

To do something similar here, the script would need to look like this:

#!/bin/bash

if [ -d /Volumes/XYZ ];
    then
    echo “Ejecting XYZ!”;
    umount /Volumes/XYZ
    exit;
fi

Save it somewhere, your ~/bin/ directory if you have one, or maybe ~/Library/Scripts/, just remember where.

The second piece of the puzzle is the LaunchAgent that will actually handle the event whenever a drive is mounted:

    Label
    com.superuser.226504.example
    ProgramArguments
    
        /Path/To/Script/unmount-modem.sh
    
    QueueDirectories
    
    StartOnMount
    
    WatchPaths
    

That needs to be saved as a .plist (named similar to the string used in place of “com.superuser.226504.example”) and saved to ~/Library/LaunchAgents. You can either load it from the terminal via launchctl load ~/Library/LaunchAgents/pathtoplist or log out / log back in and it should get loaded if everything is configured properly.