docker-py login doesn't save credentials to $HOME/.docker/config.json

[jamesongithub]

docker-py (1.8.0)
Python 2.7.6
Docker version 1.10.3, build 20f81dd

The docker login cli saves the creds to $HOME/.docker/config.json. This api call doesn't seem to do the same. Not that familiar with docker-py, does it save the creds in the object? How does it work exactly?

In the docker-py docs supposedly they are identical except for being non-interactive.

[shin-]

docker-py doesn't update the config,json file.

You're right to point that out - we should update the documentation to reflect that more accurately.

[jamesongithub]

Hi @shin-,

Can you explain how login works? With respect to pulling/pushing after it's called. Does the client maintain some state and you have to reuse it?

Trying to use docker-compose via cli (since it's not yet in docker-py) after calling this and doesn't seem to authenticate when pulling.

[shin-]

The login token is kept in memory by the Client object, but it won't be available to the outside (including programs like docker-compose).

If you need to persist your credentials, you can either

• Use the docker login command.
• Write into the config.json file manually using python or some other script. docker-py, unfortunately, isn't designed for this task.

[mbroomfield-r7]

why couldn't docker-py's login function simply have a persist parameter, which, on success, writes the authentication out to `$HOME/.docker/config.json? Seems simple enough.

[mgalluscio]

@shin- Is this still the case with docker-py?

I see a parameter on the login method for the docker config file, but when I pass the path it does not seem to write anything to the file.