dex-auth service won't initialise if no connectors are specified
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Disabling the static login (through juju config dex-auth enable-password-db=false) will prevent the dex-auth service to start in the absence of a connector properly configured. The workload container will throw this message:
2023-08-07T08:39:31.967Z [dex] failed to initialize server: server: no connectors specified
And the juju debug-log will show:
File "./src/charm.py", line 172, in _update_layer
self._container.restart(self._container_name)
File "/var/lib/juju/agents/unit-dex-auth-0/charm/venv/ops/model.py", line 1466, in restart
self._pebble.restart_services(service_names)
File "/var/lib/juju/agents/unit-dex-auth-0/charm/venv/ops/pebble.py", line 1699, in restart_services
return self._services_action('restart', services, timeout, delay)
File "/var/lib/juju/agents/unit-dex-auth-0/charm/venv/ops/pebble.py", line 1721, in _services_action
raise ChangeError(change.err, change)
ops.pebble.ChangeError: cannot perform the following tasks:
- Start service "dex" (cannot start service: exited quickly with code 2)
----- Logs from task 0 -----
2023-08-07T08:47:10Z INFO Service "dex" has never been started.
Finally, changing this configuration will set the unit to error status without a proper recovery method:
dex-auth/0* error idle 10.1.235.140 hook failed: "config-changed"
All the above goes away when changing dex-auth's connectors config.
Proposed fix
Handle the case where the static login is disabled and no connector has been configured, providing enough logs and messaging to users.