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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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9
src/libexpr/flake/flake.cc
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@ -706,8 +706,6 @@ void callFlake(EvalState & state,
static void prim_getFlake(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
state.requireExperimentalFeatureOnEvaluation(Xp::Flakes, "builtins.getFlake", pos);
std::string flakeRefS(state.forceStringNoCtx(*args[0], pos));
auto flakeRef = parseFlakeRef(flakeRefS, {}, true);
if (evalSettings.pureEval && !flakeRef.input.isLocked())
@ -723,7 +721,12 @@ static void prim_getFlake(EvalState & state, const Pos & pos, Value * * args, Va
v);
}
static RegisterPrimOp r2("__getFlake", 1, prim_getFlake);
static RegisterPrimOp r2({
.name = "__getFlake",
.args = {"args"},
.fun = prim_getFlake,
.experimentalFeature = Xp::Flakes,
});
}