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nix-cli: use pure/restricted eval for help pages

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This avoids any complications that can arise from the environment
affecting evaluation of the help pages (which don't need to be calling
out to anything external anyways)

A recent example of one of these problems is
https://github.com/NixOS/nix/issues/14085, which would break help pages
by causing them to make invalid calls to the dummy store they're
evaluated with

Fixes: https://github.com/NixOS/nix/issues/14062
Co-authored-by: Sergei Zimmerman <sergei@zimmerman.foo>
This commit is contained in:
Seth Flynn 2025-09-26 02:03:50 -04:00
parent 89141f1d67
commit ff82de86da
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1 changed files with 2 additions and 2 deletions
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4
src/nix/main.cc
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@ -226,8 +226,8 @@ static void showHelp(std::vector<std::string> subcommand, NixArgs & toplevel)
auto mdName = subcommand.empty() ? "nix" : fmt("nix3-%s", concatStringsSep("-", subcommand));
evalSettings.restrictEval = false;
evalSettings.pureEval = false;
evalSettings.restrictEval = true;
evalSettings.pureEval = true;
EvalState state({}, openStore("dummy://"), fetchSettings, evalSettings);
auto vGenerateManpage = state.allocValue();