Recurring issue with Docker auth

[hjacobs]

There is a recurring issue (sporadically popping up in Zalando support chats) about docker pull not working after doing pierone login --- usually users have to delete ~/.docker and it works again. Let's fix this once and for all.

[pmeinhardt]

IMHO pierone should not meddle with system-wide config files at all.

Instead it could act as a wrapper and use its own config directory (see the docker --config flag or the DOCKER_CONFIG env variable) so docker will continue to work as expected. I don't have a clear idea of what the command-line interface would look like then but I think an approach along those lines would be much cleaner 🤔

Just my 2 cents though 🤷‍♂

[pmeinhardt]

One common pattern for many command-line tools is to expose an init subcommand to initialize the shell environment. E.g.

eval $(pierone init)

This could take care of setting up the environment and do something like

export DOCKER_CONFIG=~/.pierone/docker

It's not super convenient, but maybe some food for thought ✌️