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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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20
src/libexpr/primops.cc
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@ -3814,7 +3814,7 @@ RegisterPrimOp::RegisterPrimOp(std::string name, size_t arity, PrimOpFun fun)
.name = name,
.args = {},
.arity = arity,
.fun = fun
.fun = fun,
});
}
@ -3886,13 +3886,17 @@ void EvalState::createBaseEnv()
if (RegisterPrimOp::primOps)
for (auto & primOp : *RegisterPrimOp::primOps)
addPrimOp({
.fun = primOp.fun,
.arity = std::max(primOp.args.size(), primOp.arity),
.name = symbols.create(primOp.name),
.args = primOp.args,
.doc = primOp.doc,
});
if (!primOp.experimentalFeature
|| settings.isExperimentalFeatureEnabled(*primOp.experimentalFeature))
{
addPrimOp({
.fun = primOp.fun,
.arity = std::max(primOp.args.size(), primOp.arity),
.name = symbols.create(primOp.name),
.args = primOp.args,
.doc = primOp.doc,
});
}
/* Add a wrapper around the derivation primop that computes the
`drvPath' and `outPath' attributes lazily. */