return error on property changes

[Patrick Williams]

On Sun, Apr 23, 2023 at 08:29:03AM +0000, Francine Sauvage wrote:
> Hi,
> I cannot implement the following use case:
> 
> From bmcweb code, I set RequestedPowerTransition.
> From requestedPowerTransition (phosphor-state-manager) code , I have a bad condition and I reject the transition.
> 
> ==> How can I throw something (error code, exception ?) back to bmcweb in order to know what happened exactly ?
> 
> I was not able to add a "exceptions:" part in yaml around a property to create and throw a specific exception while getting / setting a property, like I did with methods.
> 
> I need to declare (and return) an exception while a property is changing, especially when the transition is not accepted.
> 
> I have an old version of openbmc, it may be solved in the new version, but please tell me how to help me eventually patching the needed parts,
> 

I think you used the wrong YAML keyword.

```
$ git grep "exceptions:" | wc -l       
0
$ git grep "errors:" | wc -l       
161
```

-- 
Patrick Williams
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