Users have trouble understanding the different login paths on the CLI.
The default login is performed through an OAuth flow with the option to
fallback to a username and PAT login using the docker login -u <username>
option.
This patch improves the text around docker login, indicating:
- The username is shown when already authenticated
- Steps the user can take to switch user accounts are printed when
authenticated in an info.
- When not authenticated, the OAuth login flow explains the fallback
clearly to the user in an info.
- The password prompt now explicitly states that it accepts a PAT in an
info.
Signed-off-by: Alano Terblanche <18033717+Benehiko@users.noreply.github.com>
This commit adds support for the oauth [device-code](https://auth0.com/docs/get-started/authentication-and-authorization-flow/device-authorization-flow)
login flow when authenticating against the official registry.
This is achieved by adding `cli/internal/oauth`, which contains code to manage
interacting with the Docker OAuth tenant (`login.docker.com`), including launching
the device-code flow, refreshing access using the refresh-token, and logging out.
The `OAuthManager` introduced here is also made available through the `command.Cli`
interface method `OAuthManager()`.
In order to maintain compatibility with any clients manually accessing
the credentials through `~/.docker/config.json` or via credential
helpers, the added `OAuthManager` uses the retrieved access token to
automatically generate a PAT with Hub, and store that in the
credentials.
Signed-off-by: Laura Brehm <laurabrehm@hey.com>
