fix variable shadowing bug in etcd_tools.go

pkg/tools/etcd_tools.go

@@ -329,15 +329,14 @@ func (h *EtcdHelper) SetObj(key string, obj, out runtime.Object, ttl uint64) err
 
 	create := true
 	if h.ResourceVersioner != nil {
-		version, err := h.ResourceVersioner.ResourceVersion(obj)
-		if err == nil && version != 0 {
+		if version, err := h.ResourceVersioner.ResourceVersion(obj); err == nil && version != 0 {
 			create = false
 			response, err = h.Client.CompareAndSwap(key, string(data), ttl, "", version)
+			if err != nil {
+				return err
+			}
 		}
 	}
-	if err != nil {
-		return err
-	}
 	if create {
 		// Create will fail if a key already exists.
 		response, err = h.Client.Create(key, string(data), ttl)

pkg/tools/etcd_tools_test.go

@@ -414,6 +414,17 @@ func TestSetObj(t *testing.T) {
 	}
 }
 
+func TestSetObjFailCAS(t *testing.T) {
+	obj := &api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo", ResourceVersion: "1"}}
+	fakeClient := NewFakeEtcdClient(t)
+	fakeClient.CasErr = fakeClient.NewError(123)
+	helper := EtcdHelper{fakeClient, testapi.Codec(), versioner}
+	err := helper.SetObj("/some/key", obj, nil, 5)
+	if err == nil {
+		t.Errorf("Expecting error.")
+	}
+}
+
 func TestSetObjWithVersion(t *testing.T) {
 	obj := &api.Pod{ObjectMeta: api.ObjectMeta{Name: "foo", ResourceVersion: "1"}}
 	fakeClient := NewFakeEtcdClient(t)

pkg/tools/fake_etcd_client.go

@@ -47,6 +47,7 @@ type FakeEtcdClient struct {
 	expectNotFoundGetSet map[string]struct{}
 	sync.Mutex
 	Err         error
+	CasErr      error
 	t           TestLogger
 	Ix          int
 	TestIndex   bool
@@ -225,6 +226,10 @@ func (f *FakeEtcdClient) CompareAndSwap(key, value string, ttl uint64, prevValue
 		f.t.Logf("c&s: returning err %v", f.Err)
 		return nil, f.Err
 	}
+	if f.CasErr != nil {
+		f.t.Logf("c&s: returning err %v", f.CasErr)
+		return nil, f.CasErr
+	}
 
 	if !f.TestIndex {
 		f.t.Errorf("Enable TestIndex for test involving CompareAndSwap")