As a follow up from Using Source Control with SLX 72, here is how Subversion allowed the upgrade from 7.2.1 to 7.2.2 without having to use the AA bundle installation process (well, having to use it only once):

1. Start with a “vanilla” 7.2.1 source tree, and create a branch for it.
2. Create a Vanilla-7.2.2 branch and apply all the 7.2.2 bundles for it.
3. Now use those 2 branches to upgrade your custom source tree:
   
4. Subversion will apply the differences and mark all problem files with a “conflict” symbol:. You need to review those manually to merge the changes. In most cases I just accepted the new version (the file marked as “right”)
5. This takes care of the “Model” part. For the actual portal source files (the web.config etc) I just redirect the portal source files to the “Vanilla” version.

I can’t really comment on whether or not this is easier than upgrading using the bundler because I was never able to successfully do that (except for the vanilla database)!! But at least it was faster.