This ticket tracks teaching some mach try invocation(s) to recycle existing tasks from other places. This is item 2) of https://bugzilla.mozilla.org/show_bug.cgi?id=1561423#c9.

My immediate use cases have been:

• MSIX repackaging
• single-locale repacks

Doing this doesn't require changes to test archives (namely Bug 1628981), which we should also do, but is a longer road.

This approach is a path of least resistance.

One use case (which may not happen often) I have is to reuse the cpp artifacts from one push in a second push (I changed cpp earlier but now my patch is just iterating on java). I think the value is that my try pushes would take 5min rather than 20min (the test I'm trying to fix with java code takes ~3 minutes and java builds are similarly quick but I spend most of my time waiting for the native build).