Added remove loopdevice func

mod/disk/raid/losetup.go

@@ -42,7 +42,7 @@ func ListAllLoopDevices() ([]*LoopDevice, error) {
 			imageName := strings.TrimPrefix(strings.TrimSpace(fields[2]), "(")
 			imageName = strings.TrimSuffix(imageName, ")")
 			devices = append(devices, &LoopDevice{
-				Device:         fields[0],
+				Device:         strings.TrimSuffix(fields[0], ":"),
 				PartitionRange: fields[1],
 				ImageFile:      imageName,
 			})
@@ -67,6 +67,42 @@ func MountImageAsLoopDevice(imagePath string) error {
 	return nil
 }
 
+// Unmount a loop device by the image path
+func UnmountLoopDeviceByImagePath(imagePath string) error {
+	imagePathIsMounted, err := ImageMountedAsLoopDevice(imagePath)
+	if err != nil {
+		return err
+	}
+
+	if !imagePathIsMounted {
+		//Image already unmounted. No need to unmount
+		return nil
+	}
+
+	loopDriveID, err := GetLoopDriveIDFromImagePath(imagePath)
+	if err != nil {
+		return err
+	}
+
+	//As we checked for mounted above, no need to check if loopDriveID is empty string
+	return UnmountLoopDeviceByID(loopDriveID)
+}
+
+// Unmount the loop device by id e.g. /dev/loop1
+func UnmountLoopDeviceByID(loopDevId string) error {
+	cmd := exec.Command("sudo", "losetup", "-d", loopDevId)
+
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+
+	err := cmd.Run()
+	if err != nil {
+		return fmt.Errorf("delete loopback device failed: %v", err)
+	}
+
+	return nil
+}
+
 // Get loopdrive ID (/dev/loop1) by the image path, return empty string if not found error if load failed
 func GetLoopDriveIDFromImagePath(imagePath string) (string, error) {
 	absPath, err := filepath.Abs(imagePath)
@@ -90,7 +126,7 @@ func GetLoopDriveIDFromImagePath(imagePath string) (string, error) {
 }
 
 // Check if an image file is already mounted as loop drive
-func ImageAlreadyMounted(imagePath string) (bool, error) {
+func ImageMountedAsLoopDevice(imagePath string) (bool, error) {
 	loopDriveId, err := GetLoopDriveIDFromImagePath(imagePath)
 	if err != nil {
 		return false, err