mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2025-03-17 05:48:21 +00:00
127 lines
2.9 KiB
Go
127 lines
2.9 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 local
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"sigs.k8s.io/node-feature-discovery/source"
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)
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// Config
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var (
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hookDir = "/etc/kubernetes/node-feature-discovery/source.d/"
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logger = log.New(os.Stderr, "", log.LstdFlags)
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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 "local" }
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func (s Source) Discover() (source.Features, error) {
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features := source.Features{}
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files, err := ioutil.ReadDir(hookDir)
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if err != nil {
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if os.IsNotExist(err) {
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log.Printf("ERROR: hook directory %v does not exist", hookDir)
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return features, nil
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}
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return features, fmt.Errorf("Unable to access %v: %v", hookDir, err)
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}
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for _, file := range files {
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hook := file.Name()
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hookFeatures, err := runHook(hook)
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if err != nil {
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log.Printf("ERROR: source hook '%v' failed: %v", hook, err)
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continue
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}
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for feature, value := range hookFeatures {
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if feature[0] == '/' {
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// Use feature name as the label as is if it is prefixed with a slash
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features[feature[1:]] = value
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} else {
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// Normally, use hook name as label prefix
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features[hook+"-"+feature] = value
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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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// Run one hook
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func runHook(file string) (map[string]string, error) {
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features := map[string]string{}
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path := filepath.Join(hookDir, file)
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filestat, err := os.Stat(path)
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if err != nil {
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log.Printf("ERROR: skipping %v, failed to get stat: %v", path, err)
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return features, err
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}
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if filestat.Mode().IsRegular() {
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cmd := exec.Command(path)
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var stdout bytes.Buffer
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var stderr bytes.Buffer
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cmd.Stdout = &stdout
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cmd.Stderr = &stderr
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// Run hook
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err = cmd.Run()
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// Forward stderr to our logger
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lines := bytes.Split(stderr.Bytes(), []byte("\n"))
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for i, line := range lines {
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if i == len(lines)-1 && len(line) == 0 {
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// Don't print the last empty string
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break
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}
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log.Printf("%v: %s", file, line)
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}
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// Do not return any features if an error occurred
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if err != nil {
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return features, err
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}
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// Return features printed to stdout
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lines = bytes.Split(stdout.Bytes(), []byte("\n"))
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for _, line := range lines {
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if len(line) > 0 {
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lineSplit := strings.SplitN(string(line), "=", 2)
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if len(lineSplit) == 1 {
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features[lineSplit[0]] = "true"
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} else {
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features[lineSplit[0]] = lineSplit[1]
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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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