forked from Ivasoft/device-mapping-manager
92 lines
2.4 KiB
Go
92 lines
2.4 KiB
Go
//go:build linux
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/*
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* Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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 cgroup
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import (
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"bufio"
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"github.com/opencontainers/runtime-spec/specs-go"
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)
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type DeviceRule = specs.LinuxDeviceCgroup
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type Interface interface {
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GetDeviceCGroupMountPath(procRootPath string, pid int) (string, string, error)
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GetDeviceCGroupRootPath(procRootPath string, prefix string, pid int) (string, error)
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AddDeviceRules(cgroupPath string, devices []DeviceRule) error
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}
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func New(version int) (Interface, error) {
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switch version {
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case 1:
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return &cgroupv1{}, nil
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case 2:
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return &cgroupv2{}, nil
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default:
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return nil, fmt.Errorf("invalid version")
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}
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}
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type cgroupv1 struct{}
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type cgroupv2 struct{}
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var _ Interface = (*cgroupv1)(nil)
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var _ Interface = (*cgroupv2)(nil)
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// GetDeviceCGroupVersion returns the version of linux cgroups in use
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func GetDeviceCGroupVersion(rootPath string, pid int) (int, error) {
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// Open the pid's cgroup file in /proc.
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path := fmt.Sprintf(filepath.Join(rootPath, "proc", "%v", "cgroup"), pid)
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file, err := os.Open(path)
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if err != nil {
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return -1, fmt.Errorf("failed to open cgroup path for pid '%d': %v", pid, err)
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}
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defer file.Close()
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// Create a scanner to loop through the file's contents.
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scanner := bufio.NewScanner(file)
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scanner.Split(bufio.ScanLines)
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// Loop through the file looking for either a 'devices' or a '' (i.e. unified) entry
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found := make(map[string]bool)
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for scanner.Scan() {
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parts := strings.SplitN(scanner.Text(), ":", 3)
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if len(parts) != 3 {
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return -1, fmt.Errorf("malformed cgroup entry: %v", scanner.Text())
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}
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found[parts[1]] = true
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}
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// If a 'devices' entry was found, return version 1.
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if found["devices"] {
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return 1, nil
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}
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// If a '', (i.e. 'unified') entry was found, return version 2.
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if found[""] {
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return 2, nil
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}
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return -1, fmt.Errorf("no devices or unified cgroup entries found")
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}
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