Persisting variables for updates or adding additional updateparameter

[woscostametaxa]

A scenario would be as follows:

I have a default Update feed location, as well as maybe a second one (or the possibility to use a programmatically given one).
default update feed has (in descending order) bundle2 and bundle1
testing update feed has bundle3 bundle2 bundle1.

What already works is updating as long as I am on the default feed that has been added automatically to the BA at build time -> so using just bundle1, from ARP, I can update fine to bundle2.

When opening ARP from installed bundle2, if I switch the feed, use Engine.SetUpdateSource to change the feed and redetect I can find the update. My problem is now when the update starts, it only finds the default feed because it is preselected.

I do know I can persist variables, but just for the bundle itself; for updates normally I have automated myself a remember pattern msi bundle to persist all the variables I want to read when running an updated bundle - but is there a best practice on how to inform the bundle to change the feed where it searches for basically itself?

In my example I don't use compressed bundles, so I only download 2mb, and I concat basically the directory where the updatebundle resides with the relative "source" from CacheAcquireBegin (with forward slashes) which works beautifully - if the package can find "itself" on the feed.

The visual studio installer needs to be restarted when switching feeds, so would the best practice be to use a persisted variable, change that, restart, and read the variable bevore detection or is there a more elegant solution?

Could/Should GetRelatedBundleVariable be used for instance?

I have now tried it with a persisted variable - which I initialize on running with empty string - then trying to set it to the currently used Feed if it is not the default one - but when I close the installed BA, after opening it again with ARP, the initial value is reset to empty string again. Am I using the persisted variables in a wrong way? Should I somehow use the rememberpattern to (re)install the Msi containing my variables so the changed variable is persisted?

I know that the VStudio Installer needs a restart when switching the Feed, which I thought could persist the variable, but I am probably using something wrong?