AUR as an upstream

[ejiektpobehuk]

I have a git repository with PKGBUILDs for my binary repository.
git subtree allows me to have others AUR packages as separate directories and pull updates as if it is a local version of AUR package repo.

I suggest git subtree as a default mechanism for AUR upstream.
PacOps should try to pull changes.

Conflicts are possible when there are local changes.
We should signal user that update is available & it requires attention.