Fix volume secret_test.go on darwin by not checking volume usage metrics

pkg/volume/metrics_du.go

@@ -19,8 +19,6 @@ package volume
 import (
 	"errors"
 	"fmt"
-	"os/exec"
-	"strings"
 
 	"k8s.io/kubernetes/pkg/api/resource"
 	"k8s.io/kubernetes/pkg/volume/util"
@@ -64,17 +62,10 @@ func (md *metricsDu) GetMetrics() (*Metrics, error) {
 
 // runDu executes the "du" command and writes the results to metrics.Used
 func (md *metricsDu) runDu(metrics *Metrics) error {
-	// Uses the same niceness level as cadvisor.fs does when running du
-	// Uses -B 1 to always scale to a blocksize of 1 byte
-	out, err := exec.Command("nice", "-n", "19", "du", "-s", "-B", "1", md.path).CombinedOutput()
+	used, err := util.Du(md.path)
 	if err != nil {
-		return fmt.Errorf("failed command 'du' on %s with error %v", md.path, err)
+		return err
 	}
-	used, err := resource.ParseQuantity(strings.Fields(string(out))[0])
-	if err != nil {
-		return fmt.Errorf("failed to parse 'du' output %s due to error %v", out, err)
-	}
-	used.Format = resource.BinarySI
 	metrics.Used = used
 	return nil
 }

pkg/volume/secret/secret_test.go

@@ -21,10 +21,10 @@ import (
 	"io/ioutil"
 	"os"
 	"path"
+	"runtime"
 	"strings"
 	"testing"
 
-	"github.com/stretchr/testify/assert"
 	"k8s.io/kubernetes/pkg/api"
 	clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
 	"k8s.io/kubernetes/pkg/client/testing/fake"
@@ -33,6 +33,8 @@ import (
 	"k8s.io/kubernetes/pkg/volume"
 	"k8s.io/kubernetes/pkg/volume/empty_dir"
 	"k8s.io/kubernetes/pkg/volume/util"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func newTestHost(t *testing.T, clientset clientset.Interface) (string, volume.VolumeHost) {
@@ -122,12 +124,16 @@ func TestPlugin(t *testing.T) {
 		}
 	}
 	doTestSecretDataInVolume(volumePath, secret, t)
+	defer doTestCleanAndTeardown(plugin, testPodUID, testVolumeName, volumePath, t)
 
+	// Metrics only supported on linux
 	metrics, err := builder.GetMetrics()
-	assert.NotEmpty(t, metrics)
-	assert.NoError(t, err)
-
-	doTestCleanAndTeardown(plugin, testPodUID, testVolumeName, volumePath, t)
+	if runtime.GOOS == "linux" {
+		assert.NotEmpty(t, metrics)
+		assert.NoError(t, err)
+	} else {
+		t.Skipf("Volume metrics not supported on %s", runtime.GOOS)
+	}
 }
 
 // Test the case where the 'ready' file has been created and the pod volume dir

pkg/volume/util/fs_darwin.go

@@ -0,0 +1,47 @@
+// +build darwin
+
+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package util
+
+import (
+	"errors"
+	"fmt"
+	"os/exec"
+	"strings"
+
+	"k8s.io/kubernetes/pkg/api/resource"
+)
+
+// FSInfo linux returns (available bytes, byte capacity, error) for the filesystem that
+// path resides upon.
+func FsInfo(path string) (int64, int64, error) {
+	return 0, 0, errors.New("FsInfo not supported for this build.")
+}
+
+func Du(path string) (*resource.Quantity, error) {
+	out, err := exec.Command("nice", "-n", "19", "du", "-s", path).CombinedOutput()
+	if err != nil {
+		return nil, fmt.Errorf("failed command 'du' ($ nice -n 19 du -s) on path %s with error %v", path, err)
+	}
+	used, err := resource.ParseQuantity(strings.Fields(string(out))[0])
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse 'du' output %s due to error %v", out, err)
+	}
+	used.Format = resource.BinarySI
+	return used, nil
+}

pkg/volume/util/fs_linux.go

@@ -19,7 +19,12 @@ limitations under the License.
 package util
 
 import (
+	"fmt"
+	"os/exec"
+	"strings"
 	"syscall"
+
+	"k8s.io/kubernetes/pkg/api/resource"
 )
 
 // FSInfo linux returns (available bytes, byte capacity, error) for the filesystem that
@@ -39,3 +44,18 @@ func FsInfo(path string) (int64, int64, error) {
 
 	return available, capacity, nil
 }
+
+func Du(path string) (*resource.Quantity, error) {
+	// Uses the same niceness level as cadvisor.fs does when running du
+	// Uses -B 1 to always scale to a blocksize of 1 byte
+	out, err := exec.Command("nice", "-n", "19", "du", "-s", "-B", "1", path).CombinedOutput()
+	if err != nil {
+		return nil, fmt.Errorf("failed command 'du' ($ nice -n 19 du -s -B 1) on path %s with error %v", path, err)
+	}
+	used, err := resource.ParseQuantity(strings.Fields(string(out))[0])
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse 'du' output %s due to error %v", out, err)
+	}
+	used.Format = resource.BinarySI
+	return used, nil
+}

pkg/volume/util/fs_unsupported.go

@@ -1,4 +1,4 @@
-// +build !linux
+// +build !linux,!darwin
 
 /*
 Copyright 2014 The Kubernetes Authors All rights reserved.
@@ -20,9 +20,16 @@ package util
 
 import (
 	"errors"
+	"fmt"
+
+	"k8s.io/kubernetes/pkg/api/resource"
 )
 
 // FSInfo unsupported returns 0 values for available and capacity and an error.
 func FsInfo(path string) (int64, int64, error) {
 	return 0, 0, errors.New("FsInfo not supported for this build.")
 }
+
+func Du(path string) (*resource.Quantity, error) {
+	return nil, fmt.Errorf("Du not support for this build.")
+}