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If running "nova console-log" command against v3 API, the command fails
like the following:

$ nova --os-compute-api-version 3 console-log vm01
ERROR: Invalid input for field/attribute length. Value: None. None is not of type 'integer', 'string' (HTTP 400) (Request-ID: req-b8588c9b-58a7-4e22-a2e9-30c5354ae4f7)
$

This is because API schema of the API does not allow null as the length of log.
However, get_console_output() of nova-compute allows null by the following code:

3942     def get_console_output(self, context, instance, tail_length):
3943         """Send the console output for the given instance."""
3944         instance = instance_obj.Instance._from_db_object(
3945             context, instance_obj.Instance(), instance)
3946         context = context.elevated()
3947         LOG.audit(_("Get console output"), context=context,
3948                   instance=instance)
3949         output = self.driver.get_console_output(context, instance)
3950
3951         if tail_length is not None:
3952             output = self._tail_log(output, tail_length)
3953
3954         return output.decode('utf-8', 'replace').encode('ascii', 'replace')

So the API also should allow it.

** Affects: nova
     Importance: Undecided
     Assignee: Ken'ichi Ohmichi (oomichi)
         Status: In Progress

-- 
"get console output" v3 API should allow "null" as the length
https://bugs.launchpad.net/bugs/1295426
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