AttributeError: 'NoneType' object has no attribute 'fileno'

[KelSolaar]

Hello,

I'm trying to start some of our processes via rez using Epic Games' Switchboard Listener and there is not fileno defined in that context so I'm getting an exception:

AttributeError: 'NoneType' object has no attribute 'fileno'

https://github.com/AcademySoftwareFoundation/rez/blob/89686626c37e68391c61a5e7a55c9490984f933b/src/rez/utils/execution.py#L67

If fixed it on my end by adding yet another try...except AttributeError around the second call to sys.__stdin__:

                try:
                    file_no = sys.__stdin__.fileno()
                except AttributeError:
                    file_no = None

Cheers,

Thomas

[JeanChristopheMorinPerso]

Thanks @KelSolaar ! I'm curious, what is sys.__stdin__ set to? It's clearly set to something from what I see right? Else that block woudn't be exeuted because the if statement checks if sys.__stdin__ is not None... Generally speaking, I think __stdin__ is expected to be a file like object, so maybe the issue could also be reported to Unreal devs? I think we have some Unreal devs in ASWF...

[KelSolaar]

Yeah it is set to None, I can ask on UDN too.

[KelSolaar]

https://udn.unrealengine.com/s/question/0D54z00008osjsBCAQ/calling-a-python-script-that-access-sysstdinfileno-from-switchboardlistener-raises-an-exception

[KelSolaar]

Epic has patched Switchboard Listener: https://github.com/EpicGames/UnrealEngine/commit/8705ef5a4a889f4b3c7c02016bb0e5a1af932c4a

Let's close this one!

[JeanChristopheMorinPerso]

Thanks for the update! I'm happy they fixed their stuff.