fix: handle missing tailscale binary

extensions/voice-call/src/webhook/tailscale.test.ts

@@ -40,6 +40,19 @@ function createProc(params?: { code?: number; stdout?: string }) {
   return proc;
 }
 
+function createErrorProc() {
+  const proc = new EventEmitter() as EventEmitter & {
+    stdout: EventEmitter;
+    kill: ReturnType<typeof vi.fn>;
+  };
+  proc.stdout = new EventEmitter();
+  proc.kill = vi.fn();
+  setTimeout(() => {
+    proc.emit("error", Object.assign(new Error("spawn tailscale ENOENT"), { code: "ENOENT" }));
+  }, 0);
+  return proc;
+}
+
 describe("voice-call tailscale helpers", () => {
   beforeEach(() => {
     vi.clearAllMocks();
@@ -83,6 +96,12 @@ describe("voice-call tailscale helpers", () => {
     await expect(getTailscaleSelfInfo()).resolves.toBeNull();
   });
 
+  it("treats missing tailscale binary as unavailable instead of leaking spawn errors", async () => {
+    spawnMock.mockReturnValueOnce(createErrorProc());
+
+    await expect(getTailscaleSelfInfo()).resolves.toBeNull();
+  });
+
   it("sets up and cleans up exposure routes with the selected mode", async () => {
     spawnMock
       .mockReturnValueOnce(

extensions/voice-call/src/webhook/tailscale.ts

@@ -16,18 +16,32 @@ function runTailscaleCommand(
     });
 
     let stdout = "";
+    let settled = false;
+    let timer: ReturnType<typeof setTimeout>;
+    const finish = (result: { code: number; stdout: string }) => {
+      if (settled) {
+        return;
+      }
+      settled = true;
+      clearTimeout(timer);
+      resolve(result);
+    };
+
     proc.stdout.on("data", (data) => {
       stdout += data;
     });
 
-    const timer = setTimeout(() => {
+    timer = setTimeout(() => {
       proc.kill("SIGKILL");
-      resolve({ code: -1, stdout: "" });
+      finish({ code: -1, stdout: "" });
     }, timeoutMs);
 
+    proc.on("error", () => {
+      finish({ code: -1, stdout: "" });
+    });
+
     proc.on("close", (code) => {
-      clearTimeout(timer);
-      resolve({ code: code ?? -1, stdout });
+      finish({ code: code ?? -1, stdout });
     });
   });
 }