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Require flake.nix to be an attrset (not a non-trivial thunk)

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This commit is contained in:
Eelco Dolstra 2019-09-09 17:34:38 +02:00
parent c87840ae14
commit f97d3753a1
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GPG key ID: 8170B4726D7198DE
4 changed files with 28 additions and 8 deletions
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19
src/libexpr/eval.cc
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@ -179,6 +179,18 @@ string showType(const Value & v)
}
bool Value::isTrivial() const
{
return
type != tApp
&& type != tPrimOpApp
&& (type != tThunk
|| (dynamic_cast<ExprAttrs *>(thunk.expr)
&& ((ExprAttrs *) thunk.expr)->dynamicAttrs.empty())
|| dynamic_cast<ExprLambda *>(thunk.expr));
}
#if HAVE_BOEHMGC
/* Called when the Boehm GC runs out of memory. */
static void * oomHandler(size_t requested)
@ -749,7 +761,7 @@ Value * ExprPath::maybeThunk(EvalState & state, Env & env)
}
void EvalState::evalFile(const Path & path_, Value & v)
void EvalState::evalFile(const Path & path_, Value & v, bool mustBeTrivial)
{
auto path = checkSourcePath(path_);
@ -778,6 +790,11 @@ void EvalState::evalFile(const Path & path_, Value & v)
fileParseCache[path2] = e;
try {
// Enforce that 'flake.nix' is a direct attrset, not a
// computation.
if (mustBeTrivial &&
!(dynamic_cast<ExprAttrs *>(e)))
throw Error("file '%s' must be an attribute set", path);
eval(e, v);
} catch (Error & e) {
addErrorPrefix(e, "while evaluating the file '%1%':\n", path2);