[BUG] Poor error message when update.k3s.io returns a 5XX

[olix0r]

What did you do

The other evening I created a cluster with:

:; k3d cluster create --image=+latest

At the time update.k3s.io was returning 503 errors. These errors include an HTML response body, which causes a pretty obtuse error from k3d:

FATA[0000] error getting K3s version for channel latest: error unmarshalling channelserver response: invalid character '<' looking for beginning of value 

What did you expect to happen

k3d should check the response code when fetching channels and, if the status is not 200, it should print an error message that reports the status code it received instead of trying to parse the HTML response body.

Which version of k3d

• v5.4.4