From f6137b2dcc75b9d9fa10d675b3611290afcbce66 Mon Sep 17 00:00:00 2001
From: ajnart <thomas@ajnart.fr>
Date: Wed, 12 Aug 2026 18:24:33 +0200
Subject: [PATCH] fix(truenas): guard empty dataset percentage

---
 .../src/truenas/test/truenas-integration.spec.ts    | 13 +++++++++++++
 .../integrations/src/truenas/truenas-integration.ts |  3 ++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/packages/integrations/src/truenas/test/truenas-integration.spec.ts b/packages/integrations/src/truenas/test/truenas-integration.spec.ts
index 7f1a2ad4e..a53f74bc2 100644
--- a/packages/integrations/src/truenas/test/truenas-integration.spec.ts
+++ b/packages/integrations/src/truenas/test/truenas-integration.spec.ts
@@ -218,6 +218,19 @@ describe("TrueNasIntegration", () => {
     });
   });
 
+  test("reports zero usage for an empty root dataset", async () => {
+    ws.setResponder((method) =>
+      method === "pool.dataset.query"
+        ? [{ id: "tank", used: { parsed: 0 }, available: { parsed: 0 } }]
+        : happyResponder(method),
+    );
+    const integration = createIntegration(credentials);
+
+    const result = await integration.getSystemInfoAsync();
+
+    expect(result.fileSystem[0]?.percentage).toBe(0);
+  });
+
   test("authenticates with an API key when one is configured", async () => {
     const integration = createIntegration([{ kind: "apiKey", value: "api-key-123" }]);
 
diff --git a/packages/integrations/src/truenas/truenas-integration.ts b/packages/integrations/src/truenas/truenas-integration.ts
index 6a5249a2e..c061332f2 100644
--- a/packages/integrations/src/truenas/truenas-integration.ts
+++ b/packages/integrations/src/truenas/truenas-integration.ts
@@ -51,7 +51,8 @@ export class TrueNasIntegration extends Integration implements ISystemHealthMoni
         deviceName: dataset.name,
         available: `${dataset.available}`,
         used: `${dataset.used}`,
-        percentage: (dataset.used / (dataset.used + dataset.available)) * 100,
+        percentage:
+          dataset.used + dataset.available === 0 ? 0 : (dataset.used / (dataset.used + dataset.available)) * 100,
       })),
       availablePkgUpdates: 0,
       network: {