I wrote an AppleScript to mount a bundled sparse disk image. I want this script to be executed exactly when Time Machine launches.

I can check if Time Machine is running with on idle statement,

on idle
    return <interval>
end idle

but I'm pretty sure, it isn't a robust way to do that.

IMO making an event trigger for Application Launch event would be a better approach.

I appreciate if someone can help me.


You can use a LaunchAgent (see Lingon) to perform an action when a file is modified. Time Machine has some file somewhere that it modifies each time it starts.

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