Add support for blkio.weight_device

Signed-off-by: Ma Shimiao <mashimiao.fnst@cn.fujitsu.com>

opts/opts.go

@@ -6,8 +6,10 @@ import (
 	"os"
 	"path"
 	"regexp"
+	"strconv"
 	"strings"
 
+	"github.com/docker/docker/pkg/blkiodev"
 	"github.com/docker/docker/pkg/parsers"
 )
 
@@ -168,6 +170,9 @@ func NewMapOpts(values map[string]string, validator ValidatorFctType) *MapOpts {
 // ValidatorFctType defines a validator function that returns a validated string and/or an error.
 type ValidatorFctType func(val string) (string, error)
 
+// ValidatorWeightFctType defines a validator function that returns a validated struct and/or an error.
+type ValidatorWeightFctType func(val string) (*blkiodev.WeightDevice, error)
+
 // ValidatorFctListType defines a validator function that returns a validated list of string and/or an error
 type ValidatorFctListType func(val string) ([]string, error)
 
@@ -182,6 +187,29 @@ func ValidateAttach(val string) (string, error) {
 	return val, fmt.Errorf("valid streams are STDIN, STDOUT and STDERR")
 }
 
+// ValidateWeightDevice validates that the specified string has a valid device-weight format.
+func ValidateWeightDevice(val string) (*blkiodev.WeightDevice, error) {
+	split := strings.SplitN(val, ":", 2)
+	if len(split) != 2 {
+		return nil, fmt.Errorf("bad format: %s", val)
+	}
+	if !strings.HasPrefix(split[0], "/dev/") {
+		return nil, fmt.Errorf("bad format for device path: %s", val)
+	}
+	weight, err := strconv.ParseUint(split[1], 10, 0)
+	if err != nil {
+		return nil, fmt.Errorf("invalid weight for device: %s", val)
+	}
+	if weight > 0 && (weight < 10 || weight > 1000) {
+		return nil, fmt.Errorf("invalid weight for device: %s", val)
+	}
+
+	return &blkiodev.WeightDevice{
+		Path:   split[0],
+		Weight: uint16(weight),
+	}, nil
+}
+
 // ValidateLink validates that the specified string has a valid link format (containerName:alias).
 func ValidateLink(val string) (string, error) {
 	if _, _, err := parsers.ParseLink(val); err != nil {

opts/weightdevice.go

@@ -0,0 +1,56 @@
+package opts
+
+import (
+	"fmt"
+
+	"github.com/docker/docker/pkg/blkiodev"
+)
+
+// WeightdeviceOpt defines a map of WeightDevices
+type WeightdeviceOpt struct {
+	values    []*blkiodev.WeightDevice
+	validator ValidatorWeightFctType
+}
+
+// NewWeightdeviceOpt creates a new WeightdeviceOpt
+func NewWeightdeviceOpt(validator ValidatorWeightFctType) WeightdeviceOpt {
+	values := []*blkiodev.WeightDevice{}
+	return WeightdeviceOpt{
+		values:    values,
+		validator: validator,
+	}
+}
+
+// Set validates a WeightDevice and sets its name as a key in WeightdeviceOpt
+func (opt *WeightdeviceOpt) Set(val string) error {
+	var value *blkiodev.WeightDevice
+	if opt.validator != nil {
+		v, err := opt.validator(val)
+		if err != nil {
+			return err
+		}
+		value = v
+	}
+	(opt.values) = append((opt.values), value)
+	return nil
+}
+
+// String returns Ulimit values as a string.
+func (opt *WeightdeviceOpt) String() string {
+	var out []string
+	for _, v := range opt.values {
+		out = append(out, v.String())
+	}
+
+	return fmt.Sprintf("%v", out)
+}
+
+// GetList returns a slice of pointers to WeightDevices.
+func (opt *WeightdeviceOpt) GetList() []*blkiodev.WeightDevice {
+	var weightdevice []*blkiodev.WeightDevice
+	for _, v := range opt.values {
+		weightdevice = append(weightdevice, v)
+	}
+
+	return weightdevice
+}