Rename Generate[Read|Write]FileCmd()s

These functions are only used in fixtures.go module.
So it is not necessary to define them for exposing.
This renames these functions for making them local functions clearly.

Author: Kenichi Omichi

test/e2e/framework/volume/fixtures.go

@@ -523,7 +523,7 @@ func testVolumeContent(client clientset.Interface, pod *v1.Pod, fsGroup *int64,
 		if test.Mode == v1.PersistentVolumeBlock {
 			// Block: check content
 			deviceName := fmt.Sprintf("/opt/%d", i)
-			commands := GenerateReadBlockCmd(deviceName, len(test.ExpectedContent))
+			commands := generateReadBlockCmd(deviceName, len(test.ExpectedContent))
 			_, err := framework.LookForStringInPodExec(pod.Namespace, pod.Name, commands, test.ExpectedContent, time.Minute)
 			framework.ExpectNoError(err, "failed: finding the contents of the block device %s.", deviceName)
 
@@ -532,7 +532,7 @@ func testVolumeContent(client clientset.Interface, pod *v1.Pod, fsGroup *int64,
 		} else {
 			// Filesystem: check content
 			fileName := fmt.Sprintf("/opt/%d/%s", i, test.File)
-			commands := GenerateReadFileCmd(fileName)
+			commands := generateReadFileCmd(fileName)
 			_, err := framework.LookForStringInPodExec(pod.Namespace, pod.Name, commands, test.ExpectedContent, time.Minute)
 			framework.ExpectNoError(err, "failed: finding the contents of the mounted file %s.", fileName)
 
@@ -593,12 +593,12 @@ func InjectContent(client clientset.Interface, config TestConfig, fsGroup *int64
 		if test.Mode == v1.PersistentVolumeBlock {
 			// Block: write content
 			deviceName := fmt.Sprintf("/opt/%d", i)
-			commands = append(commands, GenerateWriteBlockCmd(test.ExpectedContent, deviceName)...)
+			commands = append(commands, generateWriteBlockCmd(test.ExpectedContent, deviceName)...)
 
 		} else {
 			// Filesystem: write content
 			fileName := fmt.Sprintf("/opt/%d/%s", i, test.File)
-			commands = append(commands, GenerateWriteFileCmd(test.ExpectedContent, fileName)...)
+			commands = append(commands, generateWriteFileCmd(test.ExpectedContent, fileName)...)
 		}
 		out, err := framework.RunKubectl(commands...)
 		framework.ExpectNoError(err, "failed: writing the contents: %s", out)
@@ -634,9 +634,9 @@ func GenerateScriptCmd(command string) []string {
 	return commands
 }
 
-// GenerateWriteBlockCmd generates the corresponding command lines to write to a block device the given content.
+// generateWriteBlockCmd generates the corresponding command lines to write to a block device the given content.
 // Depending on the Node OS is Windows or linux, the command will use powershell or /bin/sh
-func GenerateWriteBlockCmd(content, fullPath string) []string {
+func generateWriteBlockCmd(content, fullPath string) []string {
 	var commands []string
 	if !framework.NodeOSDistroIs("windows") {
 		commands = []string{"/bin/sh", "-c", "echo '" + content + "' > " + fullPath}
@@ -646,9 +646,9 @@ func GenerateWriteBlockCmd(content, fullPath string) []string {
 	return commands
 }
 
-// GenerateWriteFileCmd generates the corresponding command lines to write a file with the given content and file path.
+// generateWriteFileCmd generates the corresponding command lines to write a file with the given content and file path.
 // Depending on the Node OS is Windows or linux, the command will use powershell or /bin/sh
-func GenerateWriteFileCmd(content, fullPath string) []string {
+func generateWriteFileCmd(content, fullPath string) []string {
 	var commands []string
 	if !framework.NodeOSDistroIs("windows") {
 		commands = []string{"/bin/sh", "-c", "echo '" + content + "' > " + fullPath}
@@ -658,9 +658,9 @@ func GenerateWriteFileCmd(content, fullPath string) []string {
 	return commands
 }
 
-// GenerateReadFileCmd generates the corresponding command lines to read from a file with the given file path.
+// generateReadFileCmd generates the corresponding command lines to read from a file with the given file path.
 // Depending on the Node OS is Windows or linux, the command will use powershell or /bin/sh
-func GenerateReadFileCmd(fullPath string) []string {
+func generateReadFileCmd(fullPath string) []string {
 	var commands []string
 	if !framework.NodeOSDistroIs("windows") {
 		commands = []string{"cat", fullPath}
@@ -670,9 +670,9 @@ func GenerateReadFileCmd(fullPath string) []string {
 	return commands
 }
 
-// GenerateReadBlockCmd generates the corresponding command lines to read from a block device with the given file path.
+// generateReadBlockCmd generates the corresponding command lines to read from a block device with the given file path.
 // Depending on the Node OS is Windows or linux, the command will use powershell or /bin/sh
-func GenerateReadBlockCmd(fullPath string, numberOfCharacters int) []string {
+func generateReadBlockCmd(fullPath string, numberOfCharacters int) []string {
 	var commands []string
 	if !framework.NodeOSDistroIs("windows") {
 		commands = []string{"head", "-c", strconv.Itoa(numberOfCharacters), fullPath}