mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2024-12-14 11:57:51 +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.
114 lines
2.8 KiB
Go
114 lines
2.8 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 system
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import (
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"bufio"
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"os"
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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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)
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var osReleaseFields = [...]string{
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"ID",
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"VERSION_ID",
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}
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const Name = "system"
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// Implement FeatureSource interface
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type Source struct{}
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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 nil }
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// GetConfig method of the FeatureSource interface
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func (s *Source) GetConfig() source.Config { return nil }
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// SetConfig method of the FeatureSource interface
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func (s *Source) SetConfig(source.Config) {}
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func (s Source) Discover() (source.Features, error) {
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features := source.Features{}
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release, err := parseOSRelease()
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if err != nil {
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klog.Errorf("failed to get os-release: %s", err)
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} else {
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for _, key := range osReleaseFields {
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if value, exists := release[key]; exists {
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feature := "os_release." + key
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features[feature] = value
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if key == "VERSION_ID" {
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versionComponents := splitVersion(value)
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for subKey, subValue := range versionComponents {
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if subValue != "" {
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features[feature+"."+subKey] = subValue
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}
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}
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}
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}
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}
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}
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return features, nil
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}
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// Read and parse os-release file
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func parseOSRelease() (map[string]string, error) {
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release := map[string]string{}
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f, err := os.Open(source.EtcDir.Path("os-release"))
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if err != nil {
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return nil, err
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}
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re := regexp.MustCompile(`^(?P<key>\w+)=(?P<value>.+)`)
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// Read line-by-line
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s := bufio.NewScanner(f)
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for s.Scan() {
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line := s.Text()
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if m := re.FindStringSubmatch(line); m != nil {
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release[m[1]] = strings.Trim(m[2], `"`)
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}
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}
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return release, nil
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}
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// Split version number into sub-components. Verifies that they are numerical
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// so that they can be fully utilized in k8s nodeAffinity
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func splitVersion(version string) map[string]string {
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components := map[string]string{}
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// Currently, split out just major and minor version
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re := regexp.MustCompile(`^(?P<major>\d+)(\.(?P<minor>\d+))?(\..*)?$`)
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if m := re.FindStringSubmatch(version); m != nil {
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for i, name := range re.SubexpNames() {
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if i != 0 && name != "" {
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components[name] = m[i]
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}
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}
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}
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return components
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}
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