Re: cleanly support drag-to-trash for uninstall?
Re: cleanly support drag-to-trash for uninstall?
- Subject: Re: cleanly support drag-to-trash for uninstall?
- From: Rainer Brockerhoff <email@hidden>
- Date: Sat, 06 Aug 2011 10:00:58 -0300
On 06/08/2011, at 06:48, email@hidden wrote:
> From: Jens Alfke <email@hidden>
> Date: 6 de agosto de 2011 02:07:48 BRT
>
> On Aug 5, 2011, at 8:04 AM, Carl Harris wrote:
>
>> I have a Cocoa app that (among other things) installs an agent in launchd that runs in the background. The agent installation happens when the app is first launched after install.
>> I'd like to support the drag-to-trash approach to uninstalling. Can my background agent listen for some notification that would allow me to detect that the app bundle has been dragged to the trash, so I can clean up properly?
>
> Interesting question. I’m not aware of any such notification.
>
> The best thing I can think of is to have your agent process periodically check whether its file still exists, and exit if it doesn’t (or if it’s now inside the trash).
What I do in a similar situation is having the agent watch its own executable (as well as the containing app's bundle) with a kqueue (using EVFILT_VNODE and checking fro the flags NOTE_DELETE|NOTE_RENAME), and if this event occurs it unloads itself and exits. Works for me.
Note that moving a running application to anywhere (not just the Trash) can lead to all sorts of path-dependent operations failing, so it's best to exit fast here.
HTH,
--
Rainer Brockerhoff <email@hidden>
Belo Horizonte, Brazil
"In the affairs of others even fools are wise
In their own business even sages err."
Weblog: http://www.brockerhoff.net/blog
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