cmd/upspin setupwriters unhelpful error when config exists but keys missing

[jasonphi]

What version of Upspin are you using?

1e73992

What operating system and processor architecture are you using?

amd64, MacOS

What did you do?

Ran upspin setupwriters -domain=upspin.example.com foo@example.com bar@example.com

What did you expect to see?

Success

What did you see instead?

upspin: setupwriters: config.FromFile: item does not exist: open /Users/foo/upspin/deploy/upspin.example.com/storeserver/config: no such file or directory

Digging into the setupwriters command, it attempts to load <where/domain>/config and then tries <where/domain>/storeserver/config et al. if config.FromFile returns errors.NotExist. But, config.FromFile can return errors.NotExist for a number of files: the config file itself or the public/private keys for the given username.

I used upspin-ui to get a GCE instance setup and so my deploy folder and server keys were not placed in the expected locations initially. I think the intention was for the command to fail if server keys are not found, rather than giving an unrelated error about the storeserver config missing.