gaffer Dispatch seems to want a screen...

rupert thorpe

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Oct 29, 2021, 7:36:27 AM10/29/21

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Hello,

I have a script that finds published assets without turntables and kicks off a job to render a turntable for said asset.

this is working fine, but I tried to run it on a server rather than my workstation and I get the following error:

~~~~~~~~~~~

qt.qpa.xcb: could not connect to display

qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/mnt/apps/rez/packages/gaffer/0.60.7/platform-linux/gaffer/qt/plugins" even though it was found.

This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: linuxfb, minimal, offscreen, vnc, webgl, xcb.

/tmp/rez_context_EUm607/rez-shell.sh: line 8: 28131 Aborted (core dumped) gaffer dispatch -gui False -script //job/MGTO3/EPISODE/pipe/.............

~~~~~~~~~~~~

Does gaffer dispatch need a screen to connect to?

I ssh'ed into my own workstation and got the same issue, so it doesn't seem like its a machine configuration thing.

R

John Haddon

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Oct 29, 2021, 8:53:00 AM10/29/21

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Hi Rupert,

The `GafferUI` module does require an X display, but the GafferUI module shouldn't be loaded during dispatch. The `dispatch` app does have a GUI mode, but it makes sure not to import `GafferUI` when not in GUI mode, and the related config files do the same thing - see links below for details :

https://github.com/GafferHQ/gaffer/blob/master/apps/dispatch/dispatch-1.py#L216-L219

https://github.com/GafferHQ/gaffer/blob/master/startup/dispatch/gui.py#L47-L49

https://github.com/GafferHQ/gaffer/blob/master/startup/gui/project.py#L97-L104

https://github.com/GafferHQ/gaffer/blob/master/python/GafferTest/TestCase.py#L341-L349

It's possible that we've got a regression, but I just checked here and didn't see a problem. Perhaps something in your own codebase is doing an `import GafferUI`?

Cheers...

John

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Andrew Kaufman

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Oct 29, 2021, 8:55:21 AM10/29/21

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You would get that error if you’re importing any GafferUI module, but should not get it just from loading the “core” modules. So it will depend on your specific code and which modules are being imported.

It is pretty easy to accidentally have a UI import inside an extension module or startup config, I would guess that is the first place to look.

If you can’t untangle it, you can try using xvfb-run to run your command. We do this for the UI tests on GitHub, for example.

Cheers,

Andrew

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rupert thorpe

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Oct 29, 2021, 9:36:42 AM10/29/21

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thanks for the info.

I believe this may be from gafferDeadline, which I am using (and very happy with)

https://github.com/hypothetical-inc/GafferDeadline

will try to track it down.

On Friday, 29 October 2021 at 13:55:21 UTC+1 andrewk wrote:

You would get that error if you’re importing any GafferUI module, but should not get it just from loading the “core” modules. So it will depend on your specific code and which modules are being imported.

It is pretty easy to accidentally have a UI import inside an extension module or startup config, I would guess that is the first place to look.

If you can’t untangle it, you can try using xvfb-run to run your command. We do this for the UI tests on GitHub, for example.

Cheers,
Andrew

On Friday, 29 October 2021, rupert thorpe <pure...@gmail.com> wrote:
Hello,

I have a script that finds published assets without turntables and kicks off a job to render a turntable for said asset.

this is working fine, but I tried to run it on a server rather than my workstation and I get the following error:

~~~~~~~~~~~

qt.qpa.xcb: could not connect to display
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "/mnt/apps/rez/packages/gaffer/0.60.7/platform-linux/gaffer/qt/plugins" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: linuxfb, minimal, offscreen, vnc, webgl, xcb.

/tmp/rez_context_EUm607/rez-shell.sh: line 8: 28131 Aborted (core dumped) gaffer dispatch -gui False -script //job/MGTO3/EPISODE/pipe/.............

~~~~~~~~~~~~

Does gaffer dispatch need a screen to connect to?
I ssh'ed into my own workstation and got the same issue, so it doesn't seem like its a machine configuration thing.

R

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John Haddon

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Oct 29, 2021, 9:52:53 AM10/29/21

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At a glance, I don't see anything amiss in GafferDeadline. Could you make a `~/gaffer/startup/GafferUI/test.py` file and put this in it please?

```

import traceback
traceback.print_stack()

```

Then when you run your `gaffer dispatch` command, you should get a bunch of output that will tell us what is responsible for importing GafferUI...

Cheers...

John

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rupert thorpe

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Oct 29, 2021, 10:03:24 AM10/29/21

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[rupertt@ws-304 ~]$ rez-env gafferDefault -- gaffer dispatch

/mnt/apps/rez/packages/mysql_connector_python/8.0.23/8155fb0fa65780eccf957cd1a2e822d952f29437/python/mysql/connector/__init__.py:72: DeprecationWarning: MySQL Connector/Python will drop support for Python 2.7 in release 8.0.24. Please upgrade your Python as Python 2.7 won't work after this release

"won't work after this release", category=DeprecationWarning)

File "/rez/cache/gaffer/0.60.7/1874/a/gaffer/bin/__gaffer.py", line 168, in <module>

result = app.run()

File "/rez/cache/gaffer/0.60.7/1874/a/gaffer/python/Gaffer/Application.py", line 110, in run

return self.__run()

File "/rez/cache/gaffer/0.60.7/1874/a/gaffer/python/Gaffer/Application.py", line 141, in __run

self._executeStartupFiles( self.root().getName() )

File "/rez/cache/gaffer/0.60.7/1874/a/gaffer/python/Gaffer/Application.py", line 130, in _executeStartupFiles

IECore.loadConfig( "GAFFER_STARTUP_PATHS", contextDict, subdirectory = applicationName )

File "/rez/cache/gaffer/0.60.7/1874/a/gaffer/python/IECore/ConfigLoader.py", line 79, in loadConfig

fileContextDict, fileContextDict

File "/mnt/apps/rez/packages/six/1.16.0/ff5a17a870e473adea6d65972631222d54a381e6/python/six.py", line 735, in exec_

exec("""exec _code_ in _globs_, _locs_""")

File "<string>", line 1, in <module>

File "/mnt/apps/rez/packages/gaffer_deadline/0.55.2.0/platform-linux/gaffer_deadline/startup/dispatch/menus.py", line 1, in <module>

import GafferDeadlineUI

File "/mnt/apps/rez/packages/gaffer_deadline/0.55.2.0/platform-linux/gaffer_deadline/python/GafferDeadlineUI/__init__.py", line 38, in <module>

from .ListWidget import ListWidget

File "/mnt/apps/rez/packages/gaffer_deadline/0.55.2.0/platform-linux/gaffer_deadline/python/GafferDeadlineUI/ListWidget.py", line 43, in <module>

import GafferUI

File "/rez/cache/gaffer/0.60.7/1874/a/gaffer/python/GafferUI/__init__.py", line 305, in <module>

__import__( "IECore" ).loadConfig( "GAFFER_STARTUP_PATHS", subdirectory = "GafferUI" )

File "/rez/cache/gaffer/0.60.7/1874/a/gaffer/python/IECore/ConfigLoader.py", line 79, in loadConfig

fileContextDict, fileContextDict

File "/mnt/apps/rez/packages/six/1.16.0/ff5a17a870e473adea6d65972631222d54a381e6/python/six.py", line 735, in exec_

exec("""exec _code_ in _globs_, _locs_""")

File "<string>", line 1, in <module>

File "/rez/cache/gaffer/0.60.7/1874/a/gaffer/startup/GafferUI/test.py", line 2, in <module>

traceback.print_stack()

ERROR : gaffer dispatch : No task nodes were specified

John Haddon

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Oct 29, 2021, 10:20:42 AM10/29/21

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Looks like it was GafferDeadline after all - I've updated you ticket to include the relevant details...

Cheers...

John

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eric...@gmail.com

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Oct 29, 2021, 11:31:06 AM10/29/21

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Thanks for both reporting and helping sort out the import bug everyone. I responded to the issue on Github with a fix - in case anyone is coming across this from GafferDeadline, I'll have a new release up shortly.

Usually at this time of year problems with headless things are usually coming from up the river in Sleepy Hollow, but go figure.

- Eric

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