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To quote Eelco in #5867: > Unfortunately we can't do > > evalSettings.pureEval.setDefault(false); > > because then we have to do the same in main.cc (where > pureEval is set to true), and that would allow pure-eval > to be disabled globally from nix.conf. Instead, a command should specify that it should be impure by default. Then, `evalSettings.pureEval` will be set to `false;` unless it's overridden by e.g. a CLI flag. In that case it's IMHO OK to be (theoretically) able to override `pure-eval` via `nix.conf` because it doesn't have an effect on commands where `forceImpureByDefault` returns `false` (i.e. everything where pure eval actually matters). Closes #5867 |
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