command/logout: Add terraform logout command

[alisdair]

Use terraform logout to remove stored credentials for a remote service host. This is the corresponding command to terraform login.

Screenshots

Normal successful usage:

For a specific hostname (e.g. a TFE instance):

Using a credentials helper:

When attempting to remove credentials which were manually configured (e.g. in ~/.terraformrc):

If the credentials helper fails:

When already logged out:

[mildwonkey]

This looks great overall! I think I found a potential panic but I also may be misreading the code

[mildwonkey]

if credsCtx is nil, this will panic, and it sounds like that's not impossible .

[alisdair]

Good spot!

Unless I'm missing something, I think it actually was impossible. Despite the comments, the services were always initialized with a cliconfig.CredentialsSource, both in real code and tests. (This code was cargo culted from the login command, which is why I'm unsure.)

So in 7ff5878 I've removed the check (for both login and logout) and replaced it with a type assertion. I'm not 100% sure this is the right move, but tests pass and the commands work, and at least this way the panic will happen on a more useful line 🤷‍♂️

[mildwonkey]

Ha! That is an excellent step forward - As you said, if it happens out in the wild, we'll know when and where 😁

[ghost]

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