getDefaultNixPath: actually respect {restrict,pure}-eval
#7689
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LGTM 👍, just some minor nitpicking, and some comments not directly related to this PR that can be addressed separately.
I've tested it by strace-ing the eval and confirms that Nix doesn't try to access these files anymore when it doesn't have to. Would be nice to have a test like that, but since we don't already depend on strace I don't know of an easy way to do it. So unless someone has a good simple idea we can skip this.
Previously, getDefaultNixPath was called too early: at initialisation time, before CLI and config have been processed, when `restrictEval` and `pureEval` both have their default value `false`. Call it when initialising the EvalState instead, and use `setDefault`.
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Isn't this test enough? The idea is that we can ensure that the Nix path is empty using |
It's not enough for #5884 in that it doesn't check that Nix doesn't try to access these paths at all. But that shouldn't prevent us from merging this. |
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This pull request has been mentioned on NixOS Discourse. There might be relevant details there: https://discourse.nixos.org/t/tweag-nix-dev-update-45/26397/1 |
#4707 didn't do anything because getDefaultNixPath was called too early: at initialisation time, before CLI and config have been processed, when
restrictEvalandpureEvalboth have their default valuefalse. Call it when initialising the EvalState instead, and usesetDefault.Add tests for the
nix-pathoption and for--find-file .failing in restricted eval mode with no NIX_PATH.Checklist for maintainers
Maintainers: tick if completed or explain if not relevant
tests/**.shsrc/*/tests