mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2024-12-14 11:57:51 +00:00
102 lines
2.4 KiB
Go
102 lines
2.4 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 system
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import (
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"bufio"
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"log"
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"os"
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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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)
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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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// Implement FeatureSource interface
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type Source struct{}
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func (s Source) Name() string { return "system" }
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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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log.Printf("ERROR: 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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