Fix lost toleration when key duplicated

pkg/util/merge/merge.go

@@ -507,11 +507,15 @@ func Tolerations(defaultTolerations, overrideTolerations []corev1.Toleration) []
 	mergedTolerations := make([]corev1.Toleration, 0)
 	defaultMap := createTolerationsMap(defaultTolerations)
 	for _, v := range overrideTolerations {
-		defaultMap[v.Key] = v
+		if _, ok := defaultMap[v.Key]; ok {
+			defaultMap[v.Key] = append(defaultMap[v.Key], v)
+		} else {
+			defaultMap[v.Key] = []corev1.Toleration{v}
+		}
 	}
 
 	for _, v := range defaultMap {
-		mergedTolerations = append(mergedTolerations, v)
+		mergedTolerations = append(mergedTolerations, v...)
 	}
 
 	if len(mergedTolerations) == 0 {
@@ -525,10 +529,14 @@ func Tolerations(defaultTolerations, overrideTolerations []corev1.Toleration) []
 	return mergedTolerations
 }
 
-func createTolerationsMap(tolerations []corev1.Toleration) map[string]corev1.Toleration {
-	tolerationsMap := make(map[string]corev1.Toleration)
+func createTolerationsMap(tolerations []corev1.Toleration) map[string][]corev1.Toleration {
+	tolerationsMap := make(map[string][]corev1.Toleration)
 	for _, t := range tolerations {
-		tolerationsMap[t.Key] = t
+		if _, ok := tolerationsMap[t.Key]; ok {
+			tolerationsMap[t.Key] = append(tolerationsMap[t.Key], t)
+		} else {
+			tolerationsMap[t.Key] = []corev1.Toleration{t}
+		}
 	}
 	return tolerationsMap
 }

pkg/util/merge/merge_test.go

@@ -670,3 +670,82 @@ func TestMergeHostAliases(t *testing.T) {
 	assert.Equal(t, "1.2.3.5", merged[1].IP)
 	assert.Equal(t, []string{"abc"}, merged[1].Hostnames)
 }
+
+func TestTolerations(t *testing.T) {
+	type args struct {
+		defaultTolerations  []corev1.Toleration
+		overrideTolerations []corev1.Toleration
+	}
+	tests := []struct {
+		name string
+		args args
+		want []corev1.Toleration
+	}{
+		{
+			name: "override tolerations is nil",
+			args: args{
+				defaultTolerations: []corev1.Toleration{
+					{
+						Key:      "key1",
+						Value:    "value1",
+						Operator: corev1.TolerationOpEqual,
+					},
+					{
+						Key:      "key1",
+						Value:    "value2",
+						Operator: corev1.TolerationOpExists,
+					},
+				},
+				overrideTolerations: nil,
+			},
+			want: []corev1.Toleration{
+				{
+					Key:      "key1",
+					Value:    "value1",
+					Operator: corev1.TolerationOpEqual,
+				},
+				{
+					Key:      "key1",
+					Value:    "value2",
+					Operator: corev1.TolerationOpExists,
+				},
+			},
+		},
+
+		{
+			name: "default tolerations is nil",
+			args: args{
+				defaultTolerations: nil,
+				overrideTolerations: []corev1.Toleration{
+					{
+						Key:      "key1",
+						Value:    "value1",
+						Operator: corev1.TolerationOpEqual,
+					},
+					{
+						Key:      "key1",
+						Value:    "value2",
+						Operator: corev1.TolerationOpExists,
+					},
+				},
+			},
+			want: []corev1.Toleration{
+				{
+					Key:      "key1",
+					Value:    "value1",
+					Operator: corev1.TolerationOpEqual,
+				},
+				{
+					Key:      "key1",
+					Value:    "value2",
+					Operator: corev1.TolerationOpExists,
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			assert.Equalf(t, tt.want, Tolerations(tt.args.defaultTolerations, tt.args.overrideTolerations), "Tolerations(%v, %v)", tt.args.defaultTolerations, tt.args.overrideTolerations)
+		})
+	}
+}