>From: Development <[email protected]> on behalf of Frederik 
>Gladhorn <[email protected]>

2 Heads: use the latest revision of each branch (the system we used to have in
the past)

>3 Modules containing pinned dependency sha1s
>        Each module is completely self-contained, that means qt5 is not
>required as such (but may still exist as a collection of all modules, for
>convenience and releases). In each module we have a list of dependencies and
>their sha1.
>        Updates for a release (and also otherwise) must happen regularly (e.g.
>nightly), moving each module forward towards newer dependencies, this would be
>implemented as bot which updates the above mentioned requirements file.

I like this one. As you mentioned, we kind of had it already with 
sync.profiles.And really, if you implement this option you can almost 
implicitly run option 2 above too. In fact some modules might even want to do 
that if you permit SHA definition based on HEAD of some other repo/branch.

 There is one big question though. I vaguely recall one of the reasons for 
going to today's model was to limit the number of potential builds. This model 
could have 10 different modules/repos using different SHA's for all of its 
dependencies. Doesn't this increase the amount of different module builds which 
you have to store for later CI runs or build e.g. qtbase more often? Do we have 
the capacity/storage for it?

--
Alex
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