Nixpkgs: nixos test-driver fails on master

[FRidh]

Describe the bug
Black formatting issue.
https://hydra.nixos.org/build/130880394

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Please run nix-shell -p nix-info --run "nix-info -m" and paste the result.

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# a list of nixpkgs attributes affected by the problem
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[Ma27]

Hmm, if a package bump of black can have this kind of impact, I'm wondering if we should reconsider having a mandatory style check in our VM tests.

[FRidh]

We want to have a common style, so we use a tool. If a tool like Black has this type of "bug", there is no way around it, and it becomes your new style. If the "bug" is then resolved, you need to update your code.

I think this is annoying, but we should not make a too big of a deal out of it. Unless this of course becomes a regular thing.

[7c6f434c]

I think this is annoying, but we should not make a too big of a deal out of it. Unless this of course becomes a regular thing.

Would not be much of an issue if black was a good fit in the first place — because of variable expansion, there is no good way to reformat a NixOS VM test defined as a Nix string with some variables. This is bad even without upstream bugs.