DockerCLI/opts/weightdevice.go

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package opts
import (
"fmt"
"strconv"
"strings"
"github.com/docker/docker/api/types/blkiodev"
)
// ValidatorWeightFctType defines a validator function that returns a validated struct and/or an error.
type ValidatorWeightFctType func(val string) (*blkiodev.WeightDevice, error)
// 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
}
// 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 WeightdeviceOpt 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 {
return opt.values
}
// Type returns the option type
func (opt *WeightdeviceOpt) Type() string {
Improve usage output for docker run Commit a77f2450c70312f8c26877a18bfe2baa44d4abb9 switched `docker run` to use the `pflags` package. Due to this change, the usage output for the `--blkio-weight-device` and `--device-*` flags changed and now showed `weighted-device`, and `throttled-device` as value type. As a result, the output of `docker run --help` became a lot wider. This patch changes the output to show `list` instead, which is consistent with other options that allow to be set multiple times. Output before this change; Usage: docker run [OPTIONS] IMAGE [COMMAND] [ARG...] Run a command in a new container Options: --blkio-weight uint16 Block IO (relative weight), between 10 and 1000, or 0 to disable (default 0) --blkio-weight-device weighted-device Block IO weight (relative device weight) (default []) --device list Add a host device to the container (default []) --device-read-bps throttled-device Limit read rate (bytes per second) from a device (default []) --device-read-iops throttled-device Limit read rate (IO per second) from a device (default []) --device-write-bps throttled-device Limit write rate (bytes per second) to a device (default []) --device-write-iops throttled-device Limit write rate (IO per second) to a device (default []) -w, --workdir string Working directory inside the container Output after this change; Usage: docker run [OPTIONS] IMAGE [COMMAND] [ARG...] Run a command in a new container Options: --blkio-weight uint16 Block IO (relative weight), between 10 and 1000, or 0 to disable (default 0) --blkio-weight-device list Block IO weight (relative device weight) (default []) --device list Add a host device to the container (default []) --device-read-bps list Limit read rate (bytes per second) from a device (default []) --device-read-iops list Limit read rate (IO per second) from a device (default []) --device-write-bps list Limit write rate (bytes per second) to a device (default []) --device-write-iops list Limit write rate (IO per second) to a device (default []) -w, --workdir string Working directory inside the container Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
2016-12-30 11:35:46 -05:00
return "list"
}