jest-config: UID needs to be part of top-level folder

[jeanlauliac]

Summary

If jest runs first as root, then as non-root, then the top-level /tmp/jest folder will be owned by root and will not allow write permissions for the non-root instance. So we need to use completely different top-level folders for each user. We assume that we always have write permissions on the top-level /tmp or whichever os.tmpdir() returns.

Test plan

Automated testing.

[cpojer]

I thought about doing it this way before but I was worried that getuid calls this.<something> on process. It seems like it doesn't, so we don't need to bind?

[jeanlauliac]

I tried it out in node REPL, it worked fine, but I'll add the bind for correctness.

[jeanlauliac]

Because it could change in future version of Node with no warning, in fact.

[cpojer]

👍

[github-actions]

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