[wix-devs] 6297 - Burn needs to do better at unregistering

Sean Hall r.sean.hall at gmail.com
Tue Dec 29 19:12:46 PST 2020

I don't think any feedback could be added for Plan since nothing can be
determined until Apply finishes. I guess OnApplyComplete could provide the
new value of fInstalled (which is currently provided in OnDetectBegin).

What "best-effort" are you thinking of?

1. Leave package installed and in the package cache (I thought we decided
in 4822 this is not an option) and uninstall the bundle.
2. Leave package installed but remove from package cache and uninstall the
bundle (guaranteeing a source prompt if they try to do anything with the
3. Something else?

I don't understand the feedback there, the BA should have to do something
special to get this best-effort functionality.

On Tue, Dec 29, 2020 at 8:29 PM Bob Arnson <bob at firegiant.com> wrote:

> Seems like Plan/Apply should provide feedback to the BA in that case.
> (Hey, S_FALSE!) Probably need to tolerate it, in the case of a stubborn
> package that won't uninstall -- there should still be a "best-effort"
> attempt to clean up what it can (again, with feedback to the BA).
> -----Original Message-----
> From: wix-devs <wix-devs-bounces at lists.wixtoolset.org> On Behalf Of Sean
> Hall via wix-devs
> Sent: Tuesday, 29 December, 2020 18:58
> To: WiX Toolset Developer Mailing List <wix-devs at lists.wixtoolset.org>
> Cc: Sean Hall <r.sean.hall at gmail.com>
> Subject: Re: [wix-devs] 6297 - Burn needs to do better at unregistering
> I've started looking at implementing this. It looks like I need to modify
> the proposal for how Burn decides whether to keep the ARP entry during a
> normal operation:
> 1. Burn needs to track non-permanent packages installed or anything being
> cached.
> 2. Due to non-Vital packages and rollback boundaries, Burn needs to keep
> track of these during Apply instead of determining it ahead of time in Plan.
> This brings me to a question I had a long time ago -
> http://windows-installer-xml-wix-toolset.687559.n2.nabble.com/Burn-caching-behavior-during-uninstall-td7599411.html
> .
> Burn currently always unregisters and uncaches the bundle during Uninstall
> (if it succeeds), but I think the answer here is that it shouldn't actually
> uninstall the bundle if there will still be non-permanent packages
> installed or anything in the cache. That's going to break a lot of
> assumptions in the code, though.
> On Fri, Dec 11, 2020 at 6:07 PM Sean Hall <r.sean.hall at gmail.com> wrote:
> > I created a WIP for the automatic uninstalling of the bundle
> > discussion we were having in 4822 at
> > https://wixtoolset.org/development/wips/6297-cleanup-bundle-after-quit/.
> > I think the interesting parts here are:
> >
> > 1. Under what conditions does the engine try to automatically uninstall?
> > 2. When during runtime does it cleanup the bundle?
> > 3. Should the BA be involved at all during this automatic behavior?
> >
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