info_msg contains no language_info

[chrisjsewell]

In https://readthedocs.org/projects/myst-nb/builds/11597535/,
I'm getting the error:

Traceback (most recent call last):
  File "/home/docs/checkouts/readthedocs.org/user_builds/myst-nb/envs/latest/lib/python3.7/site-packages/jupyter_cache/executors/basic.py", line 166, in execute
    record_timing=False,
  File "/home/docs/checkouts/readthedocs.org/user_builds/myst-nb/envs/latest/lib/python3.7/site-packages/nbclient/client.py", line 1077, in execute
    return NotebookClient(nb=nb, resources=resources, km=km, **kwargs).execute()
  File "/home/docs/checkouts/readthedocs.org/user_builds/myst-nb/envs/latest/lib/python3.7/site-packages/nbclient/util.py", line 74, in wrapped
    return just_run(coro(*args, **kwargs))
  File "/home/docs/checkouts/readthedocs.org/user_builds/myst-nb/envs/latest/lib/python3.7/site-packages/nbclient/util.py", line 53, in just_run
    return loop.run_until_complete(coro)
  File "/home/docs/.pyenv/versions/3.7.3/lib/python3.7/asyncio/base_events.py", line 584, in run_until_complete
    return future.result()
  File "/home/docs/checkouts/readthedocs.org/user_builds/myst-nb/envs/latest/lib/python3.7/site-packages/nbclient/client.py", line 532, in async_execute
    self.nb.metadata['language_info'] = info_msg['content']['language_info']
KeyError: 'language_info'

its really weird because, because I can't replicate it locally, or even in RTD PR Builds, its literally only when it comes to build latest after a merge/commit 😕

[chrisjsewell]

I guess it would be ideal, at least as a first step, if we could check for this KeyError and return the info_msg['content'] in the error message, to see what is in there, and/or allow to bypass this error

[davidbrochart]

I opened a PR in #96

[chrisjsewell]

thanks!

[chrisjsewell]

It turns out that the actual reason this was occurring, is when RTD was using a "smaller" VM for the build (see readthedocs/readthedocs.org#7360) 😕
I'm getting clarification on what the specs are for this VM, but I don't know if its something that nbclient could/should handle more gracefully?

[chrisjsewell]

These are the VM specs:

We use Standard_D1_v2 and Standard_D2_v3. All limits are listed at https://docs.readthedocs.io/en/stable/builds.html

https://docs.microsoft.com/en-us/azure/virtual-machines/dv2-dsv2-series?toc=/azure/virtual-machines/linux/toc.json&bc=/azure/virtual-machines/linux/breadcrumb/toc.json

https://docs.microsoft.com/en-us/azure/virtual-machines/dv3-dsv3-series?toc=/azure/virtual-machines/linux/toc.json&bc=/azure/virtual-machines/linux/breadcrumb/toc.json

I wonder if this is also somehow related to #58