3 files changed, 21 insertions, 7 deletions

diff --git a/src/libexpr/flake/lockfile.cc b/src/libexpr/flake/lockfile.cc
index a3ed90e1f..a74e68c9c 100644
--- a/src/libexpr/flake/lockfile.cc
+++ b/src/libexpr/flake/lockfile.cc
@@ -219,7 +219,7 @@ std::optional<FlakeRef> LockFile::isUnlocked() const
     visit(root);
 
     for (auto & i : nodes) {
-        if (i == root) continue;
+        if (i == ref<const Node>(root)) continue;
         auto node = i.dynamic_pointer_cast<const LockedNode>();
         if (node && !node->lockedRef.input.isLocked())
             return node->lockedRef;
diff --git a/src/libstore/store-api.cc b/src/libstore/store-api.cc
index 295ce4953..06d746a0b 100644
--- a/src/libstore/store-api.cc
+++ b/src/libstore/store-api.cc
@@ -762,7 +762,7 @@ StorePathSet Store::queryValidPaths(const StorePathSet & paths, SubstituteFlag m
 
     auto doQuery = [&](const StorePath & path) {
         checkInterrupt();
-        queryPathInfo(path, {[path, this, &state_, &wakeup](std::future<ref<const ValidPathInfo>> fut) {
+        queryPathInfo(path, {[path, &state_, &wakeup](std::future<ref<const ValidPathInfo>> fut) {
             auto state(state_.lock());
             try {
                 auto info = fut.get();
diff --git a/src/nix/ping-store.cc b/src/nix/ping-store.cc
index 3c3b7bb45..5c44510ab 100644
--- a/src/nix/ping-store.cc
+++ b/src/nix/ping-store.cc
@@ -1,10 +1,13 @@
 #include "command.hh"
 #include "shared.hh"
 #include "store-api.hh"
+#include "finally.hh"
+
+#include <nlohmann/json.hpp>
 
 using namespace nix;
 
-struct CmdPingStore : StoreCommand
+struct CmdPingStore : StoreCommand, MixJSON
 {
     std::string description() override
     {
@@ -20,10 +23,21 @@ struct CmdPingStore : StoreCommand
 
     void run(ref<Store> store) override
     {
-        notice("Store URL: %s", store->getUri());
-        store->connect();
-        if (auto version = store->getVersion())
-            notice("Version: %s", *version);
+        if (!json) {
+            notice("Store URL: %s", store->getUri());
+            store->connect();
+            if (auto version = store->getVersion())
+                notice("Version: %s", *version);
+        } else {
+            nlohmann::json res;
+            Finally printRes([&]() {
+                logger->cout("%s", res);
+            });
+            res["url"] = store->getUri();
+            store->connect();
+            if (auto version = store->getVersion())
+                res["version"] = *version;
+        }
     }
 };