Many commands fail with "access to absolute path … is forbidden in pure eval mode"

[NobbZ]

Describe the bug

Many flake related subcommands (so far I have discovered eval, run, shell, build so far) fail with an error telling about a file not beeing accessible in pure eval mode.

Neither does the path exist for me, nor do I knowingly reference that path somewhere in my configuration.

$ nix eval nixpkgs#hello.version
error: access to absolute path '/.config/nixpkgs/overlays.nix' is forbidden in pure eval mode (use '--impure' to override)

Steps To Reproduce

1. Install a nix from master
2. allow flakes
3. run nix eval nixpkgs#hello.version

Expected behavior

The expression is correctly evaluated.

nix-env --version output

$ nix --version
nix (Nix) 2.6.0pre20211222_ddd7839

[NobbZ]

I am not quite sure which update introduced it.

A commit I know is still working properly is 18e4851.

Sadly I do not have the time to bisect this in advance.

(The commit above was taken from my systems flake lockfile, there have been other changes after that to the lock file, though I currently can't reproduce which of them has the bug and which not)

[MagicRB]

Same here, I'll get the working commit later

[thufschmitt]

Yes, that was introduced by #5807, but should have been fixed by #5826 (merged just a couple hours ago). Can you try again with the latest master?

[NobbZ]

I've just updated and switched, seems indeed to work now.