mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2025-03-17 05:48:21 +00:00
86947fc16b
Add a new 'kernel' feature source, detecting the kernel version. The kernel version is split into multiple labels in order to make this more usable in label selectors. Kernel version in the format X.Y.Z-patch will be presented as node.alpha.kubernetes-incubator.io/nfd-kernel-version.full=X.Y.Z-patch node.alpha.kubernetes-incubator.io/nfd-kernel-version.major=X node.alpha.kubernetes-incubator.io/nfd-kernel-version.minor=Y node.alpha.kubernetes-incubator.io/nfd-kernel-version.revision=Z The '.full' label will always be avaiable. The other labels if these components can be parsed from the kernel version number.
72 lines
1.7 KiB
Go
72 lines
1.7 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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"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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