Re: [Qemu-devel] [PATCH] vnc: Clarify documentation of QMP command change

[Eric Blake]

On 07/19/2017 07:10 AM, Markus Armbruster wrote:
> Marc-André Lureau <address@hidden> writes:
> 
>> Hi
>>
>> On Wed, Jul 19, 2017 at 9:09 AM, Markus Armbruster <address@hidden> wrote:
>>> QMP command
>>>
>>>     { "execute": "change",
>>>       "arguments": { "device": "vnc", "target": "password", "arg": PWD } }
>>>
>>> behaves just like
>>>
>>>     { "execute": "change-vnc-password",
>>>       "arguments": { "password", "arg": PWD } }
>>>
>>> Their documentation differs, however.  According to
>>> change-vnc-password's documentation, "an empty password [...] will set
>>> the password to the empty string", while change's documentation claims
>>> "no future logins will be allowed".  The former is actually correct.
>>> Replace the incorrect claim by a reference to change-vnc-password.
>>>
>>> Signed-off-by: Markus Armbruster <address@hidden>
>>
>> Reviewed-by: Marc-André Lureau <address@hidden>
>>
>>
>> The password would have to be NULL to disallow further login, is that
>> what your other series will allow to do?
> 
> I guess it could be applied to change-vnc-password that way.

Ideally, 'change' will be deprecated (and certainly we shouldn't add
anything further to it), but yes, 'change-vnc-password' could be
enhanced in 2.11 to use the StrOrNull alternate to use null as the
request for no password (since the empty string "" _is_ hashable as a
password, whether or not we currently allow it to be one).

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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