mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2025-03-16 21:38:23 +00:00
610b1c696c
Paves the way for future work on more general representation of feature data and looser coupling of the data and feature source interface.
137 lines
3.2 KiB
Go
137 lines
3.2 KiB
Go
/*
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Copyright 2018-2021 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 kernel
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import (
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"regexp"
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"strings"
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"k8s.io/klog/v2"
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"sigs.k8s.io/node-feature-discovery/source"
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"sigs.k8s.io/node-feature-discovery/source/internal/kernelutils"
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)
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const Name = "kernel"
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// Configuration file options
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type Config struct {
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KconfigFile string
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ConfigOpts []string `json:"configOpts,omitempty"`
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}
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// newDefaultConfig returns a new config with pre-populated defaults
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func newDefaultConfig() *Config {
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return &Config{
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KconfigFile: "",
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ConfigOpts: []string{
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"NO_HZ",
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"NO_HZ_IDLE",
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"NO_HZ_FULL",
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"PREEMPT",
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},
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}
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}
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// Implement FeatureSource interface
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type Source struct {
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config *Config
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}
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func (s *Source) Name() string { return Name }
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// NewConfig method of the FeatureSource interface
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func (s *Source) NewConfig() source.Config { return newDefaultConfig() }
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// GetConfig method of the FeatureSource interface
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func (s *Source) GetConfig() source.Config { return s.config }
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// SetConfig method of the FeatureSource interface
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func (s *Source) SetConfig(conf source.Config) {
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switch v := conf.(type) {
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case *Config:
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s.config = v
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default:
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klog.Fatalf("invalid config type: %T", conf)
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}
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}
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func (s *Source) Discover() (source.Features, error) {
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features := source.Features{}
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// Read kernel version
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version, err := parseVersion()
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if err != nil {
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klog.Errorf("failed to get kernel version: %s", err)
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} else {
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for key := range version {
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features["version."+key] = version[key]
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}
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}
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// Read kconfig
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kconfig, err := kernelutils.ParseKconfig(s.config.KconfigFile)
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if err != nil {
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klog.Errorf("failed to read kconfig: %s", err)
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}
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// Check flags
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for _, opt := range s.config.ConfigOpts {
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if val, ok := kconfig[opt]; ok {
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features["config."+opt] = val
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}
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}
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selinux, err := SelinuxEnabled()
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if err != nil {
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klog.Warning(err)
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} else if selinux {
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features["selinux.enabled"] = true
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}
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return features, nil
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}
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// Read and parse kernel version
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func parseVersion() (map[string]string, error) {
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version := map[string]string{}
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full, err := kernelutils.GetKernelVersion()
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if err != nil {
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return nil, err
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}
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// Replace forbidden symbols
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fullRegex := regexp.MustCompile("[^-A-Za-z0-9_.]")
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full = fullRegex.ReplaceAllString(full, "_")
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// Label values must start and end with an alphanumeric
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full = strings.Trim(full, "-_.")
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version["full"] = full
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// Regexp for parsing version components
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re := regexp.MustCompile(`^(?P<major>\d+)(\.(?P<minor>\d+))?(\.(?P<revision>\d+))?(-.*)?$`)
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if m := re.FindStringSubmatch(full); m != nil {
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for i, name := range re.SubexpNames() {
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if i != 0 && name != "" {
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version[name] = m[i]
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}
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}
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}
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return version, nil
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}
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