diff options
| -rw-r--r-- | src/libexpr/eval-settings.hh | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/src/libexpr/eval-settings.hh b/src/libexpr/eval-settings.hh index 6282579a9..cd73d195f 100644 --- a/src/libexpr/eval-settings.hh +++ b/src/libexpr/eval-settings.hh @@ -15,9 +15,21 @@ struct EvalSettings : Config static std::string resolvePseudoUrl(std::string_view url); Setting<bool> enableNativeCode{this, false, "allow-unsafe-native-code-during-evaluation", R"( - Whether builtin functions that allow executing native code should be enabled. + Enable built-in functions that allow executing native code. - In particular, this adds the `importNative` and `exec` builtins. + In particular, this adds: + - `builtins.importNative` *path* *symbol* + + Runs function with *symbol* from a dynamic shared object (DSO) at *path*. + This may be used to add new builtins to the Nix language. + The procedure must have the following signature: + ```cpp + extern "C" typedef void (*ValueInitialiser) (EvalState & state, Value & v); + ``` + + - `builtins.exec` *arguments* + + Execute a program, where *arguments* are specified as a list of strings, and parse its output as a Nix expression. )"}; Setting<Strings> nixPath{ |