Regression: stackoverflow on nix 2.20 and 2.21 when running poetry2nix with a projectDir from a flake input

[Atry]

Describe the bug

When running poetry2nix with a projectDir from a flake input, a stack overflow error is raised by nix 2.20 and 2.21, while nix 2.18 and 2.19 would not raise such an error.

Steps To Reproduce

1. Install Nix 2.20 or later version
2. Run nix build github:Atry/nix-2.20-crash

Now it failed to build with the following error message

[0.0 MiB DL] copying '/nix/store/0fvd8z4l32snmj9jmr3zky1aadmia0wr-source' to the storeerror: stack overflow (possible infinite recursion)

Expected behavior

Don't stack overflow

nix-env --version output

nix-env (Nix) 2.21.0

Additional context

• See https://github.com/Atry/nix-2.20-crash/blob/main/flake.nix for the source code to reproduce this bug
• No error on nix 2.18 and nix 2.19

Priorities

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[Atry]

Workaround: using pkgs.fetchFromGitHub instead of flake inputs. See Atry/nix-2.20-crash@main...good

[Atry]

Maybe related to #9672

[Atry]

Maybe related to #10115 ?

[edolstra]

Maybe related to #9672

Yeah, looks like it. This should be fixed by #10505.