Ludovic Courtès 4348947c74
weather: Report unauthorized substitute servers.
The goal is to make it easier to diagnose substitute
misconfiguration (where we’re passing a substitute URL whose
corresponding key is not authorized).

Suggested by Emmanuel Agullo.

* guix/scripts/weather.scm (check-narinfo-authorization): New procedure.
(report-server-coverage): Use it.
* doc/guix.texi (Invoking guix weather): Document it.
(Getting Substitutes from Other Servers): Add “Troubleshooting” frame.

Change-Id: I0a049c39eefb10d6a06634c8b16aa86902769791
2023-12-11 23:19:04 +01:00
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