mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2025-03-16 21:38:23 +00:00
73 lines
1.7 KiB
Go
73 lines
1.7 KiB
Go
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/*
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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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"regexp"
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"strings"
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"github.com/golang/glog"
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"github.com/kubernetes-incubator/node-feature-discovery/source"
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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 "kernel" }
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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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glog.Errorf("Failed to get kernel version: %v", 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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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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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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