x/review/git-codereview: 'git sync' should say what happened

[adg]

When git sync does a fast forward or rebase, it would be nice to know what it did.

Something like this:

$ git sync
Synced local branch 'foo' HEAD to d34db33f (17 new commits)
$ git sync
Local branch 'foo' HEAD at d34db33f (no new commits)

[dvyukov]

While we are here, please also extend help for sync.
In particular, it's unclear for me (1) whether I need to do git pull before sync, (2) whether I need to do it in master or in all change branches separately.

[bradfitz]

If this happens, can it be opt-in only? I don't like my CLI tools speaking to me, unless they had a problem.

[ysmolski]

It could be git sync -v to show what happened. Sometimes I really do want to see what happened during git sync.

Upd: apologize for the noise before. git sync -v already does prints many things, so this is not an option.