forked from lix-project/lix
docs: expand importNative/exec example (#10803)
Co-authored-by: Qyriad <qyriad@qyriad.me>
Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
(cherry picked from commit 5786e1ae7c300b3c7434e7df99b41f180dc42e37)
Change-Id: I16b408ba7c70dca985c05c71bf6195fe9f0b5841
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@ -15,9 +15,21 @@ struct EvalSettings : Config
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static std::string resolvePseudoUrl(std::string_view url);
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Setting<bool> enableNativeCode{this, false, "allow-unsafe-native-code-during-evaluation", R"(
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Whether builtin functions that allow executing native code should be enabled.
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Enable built-in functions that allow executing native code.
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In particular, this adds the `importNative` and `exec` builtins.
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In particular, this adds:
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- `builtins.importNative` *path* *symbol*
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Runs function with *symbol* from a dynamic shared object (DSO) at *path*.
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This may be used to add new builtins to the Nix language.
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The procedure must have the following signature:
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```cpp
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extern "C" typedef void (*ValueInitialiser) (EvalState & state, Value & v);
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```
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- `builtins.exec` *arguments*
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Execute a program, where *arguments* are specified as a list of strings, and parse its output as a Nix expression.
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)"};
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Setting<Strings> nixPath{
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