How can I check if a Google VM instance has already credentials for gcloud

Question

In order not to call every time:

gcloud auth login

which would interrupt a script for user input

I would like to see if a user is already authenticated (any user) and only if no user, then to call gcloud auth login.

I would love a more elegant/reliable solution than scraping the output of gcloud auth list. Something like a ping that fails or succeeds if there is an account already AND the account has the right to do the thing. Maybe a --dry-run option?

Answer 1

Being logged in means having account property set. You can extract it via

gcloud config list --format='value(core.account)' 2>/dev/null

You can also use

gcloud auth list --format='value(active_account)' 2>/dev/null