>> Is there a reason why the ua client doesn't do this itself
internally, i.e. it gives you fresh json or returns the cached copy if
it can't do the update?

Currently the only "time" during which ubuntu-advantage-tools (UA
client) could perform the logic to exec 'sudo ua status' is during
postinst at package install upgrade time. UA client can not perform that
status setup during package install for the same timeout reasons you
mentioned.  It is a potentially long operation. If run during a package
install it could delay or prevent other package upgrades if it hits a
timeout and/or error. That said, we are working on instrumenting a
systemd timer service that can run config change/setup operations out of
band of typical APT package installs. So, this case could be handled by
that timer-based service.  This SRU does represent.

This changeset as-is does represent an improvement to existing cases
because the Software properties UX demonstrates awareness of ESM (and
contract expiry information) properly for attached machines, or
unattached machines where `sudo ua status` has been run.

Subsequent releases of software-properties will now be able to take
advantage of reading "ua status --format=json" output directly as non-
root (due to a bug-fix released in 27.2.1). The non-root user will not
have to rely anymore on that json file if absent as the --format=json
output will render the same JSON dict that would be present on disk for
the root user. This is a fix that is under verification in the -proposed
queue now for ua-tools and was not available at the time of this
original software-properties PR. I'm ok with this approach as-is knowing
that we can significantly improve the behavior once ubuntu-advantage-
tools 27.2.1 is released to X B F and H

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