From 4c28ae88a6545c3a5c92a44557a7b67d74753181 Mon Sep 17 00:00:00 2001
From: adisbladis <adisbladis@gmail.com>
Date: Wed, 25 Aug 2021 03:12:19 -0500
Subject: [PATCH] Skip non-serialisable *Value in output

Most notably this includes derivations which should be fixed and
serialised to store paths.
---
 src/nix-eval-jobs.cc | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/nix-eval-jobs.cc b/src/nix-eval-jobs.cc
index a13e99f..8e35234 100644
--- a/src/nix-eval-jobs.cc
+++ b/src/nix-eval-jobs.cc
@@ -180,7 +180,15 @@ static void worker(
                 for (auto & name : drv->queryMetaNames()) {
                   PathSet context;
                   std::stringstream ss;
-                  printValueAsJSON(state, true, *drv->queryMeta(name), ss, context);
+
+                  auto metaValue = drv->queryMeta(name);
+                  // Skip non-serialisable types
+                  // TODO: Fix serialisation of derivations to store paths
+                  if (metaValue == 0) {
+                    continue;
+                  }
+
+                  printValueAsJSON(state, true, *metaValue, ss, context);
                   nlohmann::json field = nlohmann::json::parse(ss.str());
                   meta[name] = field;
                 }