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primops/import: add preflight check to parseExprFromFile

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Johannes Kirschbauer 2025-06-06 12:02:44 +02:00
parent 37b4407c5c
commit 65e142d193
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src/libexpr/eval.cc
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@ -3055,6 +3055,8 @@ Expr * EvalState::parseExprFromFile(const SourcePath & path)
Expr * EvalState::parseExprFromFile(const SourcePath & path, std::shared_ptr<StaticEnv> & staticEnv) Expr * EvalState::parseExprFromFile(const SourcePath & path, std::shared_ptr<StaticEnv> & staticEnv)
{ {
auto buffer = path.resolveSymlinks().readFile(); auto buffer = path.resolveSymlinks().readFile();
if (buffer.size() == 0) throw Error("cannot import empty file '%s'", path);
// readFile hopefully have left some extra space for terminators // readFile hopefully have left some extra space for terminators
buffer.append("\0\0", 2); buffer.append("\0\0", 2);
return parse(buffer.data(), buffer.size(), Pos::Origin(path), path.parent(), staticEnv); return parse(buffer.data(), buffer.size(), Pos::Origin(path), path.parent(), staticEnv);