93 lines
2.1 KiB
Go
93 lines
2.1 KiB
Go
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/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cgroups
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import (
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"fmt"
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"os"
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"path/filepath"
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specs "github.com/opencontainers/runtime-spec/specs-go"
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)
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const (
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allowDeviceFile = "devices.allow"
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denyDeviceFile = "devices.deny"
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wildcard = -1
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)
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func NewDevices(root string) *devicesController {
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return &devicesController{
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root: filepath.Join(root, string(Devices)),
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}
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}
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type devicesController struct {
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root string
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}
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func (d *devicesController) Name() Name {
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return Devices
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}
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func (d *devicesController) Path(path string) string {
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return filepath.Join(d.root, path)
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}
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func (d *devicesController) Create(path string, resources *specs.LinuxResources) error {
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if err := os.MkdirAll(d.Path(path), defaultDirPerm); err != nil {
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return err
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}
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for _, device := range resources.Devices {
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file := denyDeviceFile
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if device.Allow {
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file = allowDeviceFile
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}
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if device.Type == "" {
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device.Type = "a"
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}
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if err := retryingWriteFile(
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filepath.Join(d.Path(path), file),
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[]byte(deviceString(device)),
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defaultFilePerm,
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); err != nil {
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return err
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}
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}
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return nil
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}
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func (d *devicesController) Update(path string, resources *specs.LinuxResources) error {
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return d.Create(path, resources)
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}
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func deviceString(device specs.LinuxDeviceCgroup) string {
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return fmt.Sprintf("%s %s:%s %s",
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device.Type,
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deviceNumber(device.Major),
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deviceNumber(device.Minor),
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device.Access,
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)
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}
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func deviceNumber(number *int64) string {
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if number == nil || *number == wildcard {
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return "*"
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}
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return fmt.Sprint(*number)
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}
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