On Wed, 2013-09-04 at 17:27 +0100, Colin Watson wrote: > On Wed, Sep 04, 2013 at 10:29:13AM -0500, Ted Gould wrote: > > On Wed, 2013-09-04 at 16:53 +0200, Daniel Holbach wrote: > > > in a brief catch-up call Alejandro asked how we're going to uninstall > > > apps. Colin explained that there's still the open question about how we > > > can find out if the app (which is going to be uninstalled) is currently > > > running or not and what to do about it. > > > > > > This might be a question for Ted (or anyone else working on the > > > application lifecycle: how can we bring click and the app lifecycle > > > together in this scenario? > > > > Detecting isn't that difficult. The part that I don't think we have is > > how do we "pause" the garbage collector for a limited set of time. I > > think that I can get the other parts to work nicely if we have some sort > > of way to mark a version as held. > > This goes back to the question of whether we 1) have click call out to > something else to ask whether an app is running before removing it, or > 2) have something else notify click when apps start and stop in order > that it can avoid removing them when they're running. 1) means that we > will often need to run garbage collection later, but 2) means that > starting and stopping apps now has the overhead of talking to click and > furthermore sounds rather hard to do reliably. > > So I think 1) is the best option, which means that I need to know what > specifically I need to do to ask whether a given app ID is currently > running, and then I can include that when I write the removal code and > the garbage collector. > > In other words, I cannot answer your question about pausing the garbage > collector until you answer mine about exactly how to find this > information :-), and the answer will probably be that the forthcoming > garbage collector will ask or if necessary have a hook system. > > (Ideally, I'd like to know the best way to do this in both Unity 7 and > 8.)
Hah, I'll show you mine if you show me yours ;-)
For just prototyping something up there are a set of tools in
upstart-app-launch-tools that can be nicely used with shell scripts.
Assuming you have that installed you can do something like:
$ upstart-app-launch gedit
$ upstart-app-list
gedit
$ upstart-app-pid gedit
31940
It will return an error if there is no application by that ID found.
Here gedit can be any App ID.
In the non-prototyping stage you can use libupstart-app-launch which has
similar functions in it. I wasn't planning on the tools package being
installed on an image or anything else, it was more to facilitate people
working on the system. I guess there's no reason they couldn't, but
they'd probably need to be made more robust and have man pages then.
Ted
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