How do I sync all new upstream branches with my fork?

Question

Sometime ago I forked a git repo. Since then there has been several new commits to the master branch. https://help.github.com/articles/syncing-a-fork/ explains how to sync the upstream master branch with the local master branch and then push those commits to my fork.

However it does not mention how to sync new upstream branches. When I originally forked the project on github it looks like it brought over all of the then current branches.

I've seen explanations on how to sync one branch at a time. Is there any way to sync all of the branches new and old all at once?

I haven't made any commits to my fork. Thus I am looking for a fast forward sync.

Edit: Another way to say this:

I want

git ls-remote origin

to match

git ls-remote upstream

This would include branches and tags.

Answer 1

However it does not mention how to sync new upstream branches

All you need to do is:

git fetch upstream

It supposes you have a remote repository referenced as upstream.
If not:

git remote add upstream <upstream_url>

That will fetch or update all the upstream branches and store them in your local repo, in the upstream namespace.

You can see those branches with:

git branch -avv

it it doesn't let me push all of the upstream branches to origin.

For that, you need to make a local branch based on any upstream branch you want to push to origin:

git branch abranch upstream/abranch
gut push -u origin abranch 

See more at "git - create local branch from existing remote branch".

To do so for all branches, see "Pull all branches from remote through it's mirror bare remote".
Or, better: "Track all remote git branches as local branches".
Simply use "upstream" instead of origin.