consistent incomplete shutdown of devserver on mac

[indirectlylit]

Observed behavior

The devserver does not shut down using ctrl-c for me on mac:

Originally I reported this in #8376 but moved it to its own issue as the more reproducible scenario.

Errors and logs

Expected behavior

Clean shutdown

User-facing consequences

As a dev, need to keep activity monitor open and kill python processes

Steps to reproduce

start devserver and stop it

Context

latest develop

[rtibbles]

Duplicate of #7955

Note that this is an issue with yarn swallowing keyboard interrupts, so the workaround is to spawn the Python devserver separately.

[indirectlylit]

re-opening because in #7955 the python process did eventually shut down, but in this case it does not

[indirectlylit]

@rtibbles asked:

Have you tried using npm-run-all instead of run-p and using this flag?

    -r, --race   - - - - - - - Set the flag to kill all tasks when a task
                               finished with zero. This option is valid only
                               with 'parallel' option.

Just tried it and the result is the same. Snippet from package.json:

"devserver": "npm-run-all --parallel --race python-devserver lint-frontend:watch:format hashi-dev watch ",

[indirectlylit]

as a workaround in 0f168a6 I added a new frontend-devserver command. My practice is now to run two terminal tabs:

tab 1	tab 2
yarn run frontend-devserver	yarn run python-devserver

If we were to update the 'getting started' page with this guidance, we could mitigate the impact of this issue without having to fix it