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package createconfig
import (
"fmt"
"strconv"
"strings"
"github.com/docker/go-units"
)
// Pod signifies a kernel namespace is being shared
// by a container with the pod it is associated with
const Pod = "pod"
// weightDevice is a structure that holds device:weight pair
type weightDevice struct {
path string
weight uint16
}
func (w *weightDevice) String() string {
return fmt.Sprintf("%s:%d", w.path, w.weight)
}
// LinuxNS is a struct that contains namespace information
// It implemented Valid to show it is a valid namespace
type LinuxNS interface {
Valid() bool
}
// IsNS returns if the specified string has a ns: prefix
func IsNS(s string) bool {
parts := strings.SplitN(s, ":", 2)
return len(parts) > 1 && parts[0] == "ns"
}
// IsPod returns if the specified string is pod
func IsPod(s string) bool {
return s == Pod
}
// Valid checks the validity of a linux namespace
// s should be the string representation of ns
func Valid(s string, ns LinuxNS) bool {
return IsPod(s) || IsNS(s) || ns.Valid()
}
// NS is the path to the namespace to join.
func NS(s string) string {
parts := strings.SplitN(s, ":", 2)
if len(parts) > 1 {
return parts[1]
}
return ""
}
// validateweightDevice validates that the specified string has a valid device-weight format
// for blkio-weight-device flag
func validateweightDevice(val string) (*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 &weightDevice{
path: split[0],
weight: uint16(weight),
}, nil
}
// throttleDevice is a structure that holds device:rate_per_second pair
type throttleDevice struct {
path string
rate uint64
}
func (t *throttleDevice) String() string {
return fmt.Sprintf("%s:%d", t.path, t.rate)
}
// validateBpsDevice validates that the specified string has a valid device-rate format
// for device-read-bps and device-write-bps flags
func validateBpsDevice(val string) (*throttleDevice, 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)
}
rate, err := units.RAMInBytes(split[1])
if err != nil {
return nil, fmt.Errorf("invalid rate for device: %s. The correct format is <device-path>:<number>[<unit>]. Number must be a positive integer. Unit is optional and can be kb, mb, or gb", val)
}
if rate < 0 {
return nil, fmt.Errorf("invalid rate for device: %s. The correct format is <device-path>:<number>[<unit>]. Number must be a positive integer. Unit is optional and can be kb, mb, or gb", val)
}
return &throttleDevice{
path: split[0],
rate: uint64(rate),
}, nil
}
// validateIOpsDevice validates that the specified string has a valid device-rate format
// for device-write-iops and device-read-iops flags
func validateIOpsDevice(val string) (*throttleDevice, error) { //nolint
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)
}
rate, err := strconv.ParseUint(split[1], 10, 64)
if err != nil {
return nil, fmt.Errorf("invalid rate for device: %s. The correct format is <device-path>:<number>. Number must be a positive integer", val)
}
if rate < 0 {
return nil, fmt.Errorf("invalid rate for device: %s. The correct format is <device-path>:<number>. Number must be a positive integer", val)
}
return &throttleDevice{
path: split[0],
rate: uint64(rate),
}, nil
}
func getLoggingPath(opts []string) string {
for _, opt := range opts {
arr := strings.SplitN(opt, "=", 2)
if len(arr) == 2 {
if strings.TrimSpace(arr[0]) == "path" {
return strings.TrimSpace(arr[1])
}
}
}
return ""
}
// ParseDevice parses device mapping string to a src, dest & permissions string
func ParseDevice(device string) (string, string, string, error) { //nolint
src := ""
dst := ""
permissions := "rwm"
arr := strings.Split(device, ":")
switch len(arr) {
case 3:
if !IsValidDeviceMode(arr[2]) {
return "", "", "", fmt.Errorf("invalid device mode: %s", arr[2])
}
permissions = arr[2]
fallthrough
case 2:
if IsValidDeviceMode(arr[1]) {
permissions = arr[1]
} else {
if arr[1][0] != '/' {
return "", "", "", fmt.Errorf("invalid device mode: %s", arr[1])
}
dst = arr[1]
}
fallthrough
case 1:
src = arr[0]
default:
return "", "", "", fmt.Errorf("invalid device specification: %s", device)
}
if dst == "" {
dst = src
}
return src, dst, permissions, nil
}
// IsValidDeviceMode checks if the mode for device is valid or not.
// IsValid mode is a composition of r (read), w (write), and m (mknod).
func IsValidDeviceMode(mode string) bool {
var legalDeviceMode = map[rune]bool{
'r': true,
'w': true,
'm': true,
}
if mode == "" {
return false
}
for _, c := range mode {
if !legalDeviceMode[c] {
return false
}
legalDeviceMode[c] = false
}
return true
}
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