mirror of https://github.com/k3s-io/k3s
96 lines
2.1 KiB
Go
96 lines
2.1 KiB
Go
/*
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Copyright 2016 The Kubernetes 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 system
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import (
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"bufio"
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"fmt"
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"os"
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"strings"
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)
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var _ Validator = &CgroupsValidator{}
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type CgroupsValidator struct {
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Reporter Reporter
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}
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func (c *CgroupsValidator) Name() string {
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return "cgroups"
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}
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const (
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cgroupsConfigPrefix = "CGROUPS_"
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)
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func (c *CgroupsValidator) Validate(spec SysSpec) (error, error) {
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subsystems, err := c.getCgroupSubsystems()
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if err != nil {
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return nil, fmt.Errorf("failed to get cgroup subsystems: %v", err)
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}
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return nil, c.validateCgroupSubsystems(spec.Cgroups, subsystems)
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}
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func (c *CgroupsValidator) validateCgroupSubsystems(cgroupSpec, subsystems []string) error {
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missing := []string{}
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for _, cgroup := range cgroupSpec {
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found := false
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for _, subsystem := range subsystems {
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if cgroup == subsystem {
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found = true
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break
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}
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}
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item := cgroupsConfigPrefix + strings.ToUpper(cgroup)
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if found {
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c.Reporter.Report(item, "enabled", good)
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} else {
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c.Reporter.Report(item, "missing", bad)
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missing = append(missing, cgroup)
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}
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}
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if len(missing) > 0 {
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return fmt.Errorf("missing cgroups: %s", strings.Join(missing, " "))
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}
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return nil
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}
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func (c *CgroupsValidator) getCgroupSubsystems() ([]string, error) {
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f, err := os.Open("/proc/cgroups")
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if err != nil {
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return nil, err
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}
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defer f.Close()
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subsystems := []string{}
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s := bufio.NewScanner(f)
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for s.Scan() {
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if err := s.Err(); err != nil {
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return nil, err
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}
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text := s.Text()
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if text[0] != '#' {
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parts := strings.Fields(text)
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if len(parts) >= 4 && parts[3] != "0" {
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subsystems = append(subsystems, parts[0])
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}
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}
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}
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return subsystems, nil
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}
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