Maximilian Bosch
0488a0181d
Closes #496 When running nix-build ../nixpkgs --arg config.allowUnfree true -A hello-unfree the package `hello-unfree` is now built rather than getting an eval-error rejecting instantiation. This is because `config.allowUnfree` is now interpreted as nested attribute-set declaration, similar to how it's done in `nix repl`. To prevent sudden breakage, this behavior was carefully deprecated with Nix throwing an error if the identifier for `--arg` is not a pure identifier, but an expression as above. Any kind of merging is rejected. I.e. doing nix-build ../nixpkgs --arg config '{cudaSupport = true;}' --arg config.allowUnfree true is prohibited. That way we don't have to think about merge semantics for cases like this (or even worse `--arg config 'rec { ... }'`). Another nice side-effect of this is that we don't need to create an EvalState to force the values and implement merging. Change-Id: I8b560883a4468a3f32f915764b08f5fdd8fe71bb
11 lines
289 B
Markdown
11 lines
289 B
Markdown
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synopsis: "allow setting nested attributes via `--arg`/`--argstr`"
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cls: [5338]
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category: "Features"
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credits: [ma27]
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issues: [fj#496]
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---
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Passing `--arg config.allowUnfree true` to e.g. `nix-build` now results in `config` with value
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`{ allowUnfree = true; }` passed to the expression.
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