Git receive/update hooks and new branches

Question

I have a problem with the \'update\' hook. In the case of a new branch, it gets a 0000000000000000000000000000000000000000 as the \'oldrev\'. And I don\'t know how to handle

Answer 1

When $oldrev is all zeros, a different git rev-list command does all you need:

git rev-list $newrev --not --branches=*

will give you a list of revisions reachable from $newrev but not from any branches.

Note that this definitely does not do the same thing as git rev-list $oldrev..$newrev when oldrev is not all zeros, so you'll want to check which case you're in and pick the appropriate command to run.