mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2024-12-14 11:57:51 +00:00
136 lines
3.1 KiB
Go
136 lines
3.1 KiB
Go
/*
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Copyright 2018 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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"io/ioutil"
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"log"
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"regexp"
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"strings"
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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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// 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 "kernel" }
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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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log.Printf("PANIC: 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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log.Printf("ERROR: 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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log.Printf("ERROR: 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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log.Print(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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// Open file for reading
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raw, err := ioutil.ReadFile("/proc/sys/kernel/osrelease")
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if err != nil {
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return nil, err
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}
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full := strings.TrimSpace(string(raw))
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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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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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