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Only provide builtin.{getFlake,fetchClosure} is the corresponding experimental feature is enabled

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This allows writing fallback code like

  if builtins ? fetchClosure then
    builtins.fetchClose { ... }
  else
    builtins.storePath ...
This commit is contained in:
Eelco Dolstra 2022-03-25 14:04:18 +01:00
parent 55bc524019
commit 86b05ccd54
8 changed files with 31 additions and 39 deletions
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2
src/libexpr/primops.hh
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@ -16,6 +16,7 @@ struct RegisterPrimOp
size_t arity = 0;
const char * doc;
PrimOpFun fun;
std::optional<ExperimentalFeature> experimentalFeature;
};
typedef std::vector<Info> PrimOps;
@ -35,6 +36,7 @@ struct RegisterPrimOp
/* These primops are disabled without enableNativeCode, but plugins
may wish to use them in limited contexts without globally enabling
them. */
/* Load a ValueInitializer from a DSO and return whatever it initializes */
void prim_importNative(EvalState & state, const Pos & pos, Value * * args, Value & v);