Authorization plugins - passing user credentials

General
1

I’ve been looking into the new Authorization plugins feature in Docker 1.10
Specifically, I have been trying to write my own authz plugin as outlined here
Sample AuthZ

However, I am not clear how the ‘user’ credentials are passed from the client to the daemon.
I could not find any documentation or pointers related to that.
Is this parallel support required for this on the client and daemon side still WIP?

Any pointers will be much appreciated.

2

It looks nice. Do I need to recompile docker daemon with https://github.com/docker/docker/pull/18514 to use your plugin?

3

Well, the pull request seems to restart at https://github.com/docker/docker/pull/20883.