2018-07-13 12:55:28 +00:00
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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 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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2018-09-21 12:16:41 +00:00
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"strings"
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2018-07-13 12:55:28 +00:00
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2018-11-28 12:30:03 +00:00
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"sigs.k8s.io/node-feature-discovery/source"
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2018-07-13 12:55:28 +00:00
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)
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// Config
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var (
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2019-03-28 00:16:54 +00:00
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featureFilesDir = "/etc/kubernetes/node-feature-discovery/features.d/"
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hookDir = "/etc/kubernetes/node-feature-discovery/source.d/"
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2018-07-13 12:55:28 +00:00
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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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2019-03-28 00:16:54 +00:00
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featuresFromHooks, err := getFeaturesFromHooks()
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if err != nil {
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2020-05-19 13:30:50 +00:00
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log.Printf("%v", err)
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2019-03-28 00:16:54 +00:00
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}
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featuresFromFiles, err := getFeaturesFromFiles()
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if err != nil {
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2020-05-19 13:30:50 +00:00
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log.Printf("%v", err)
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2019-03-28 00:16:54 +00:00
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}
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// Merge features from hooks and files
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for k, v := range featuresFromHooks {
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2018-12-04 14:30:30 +00:00
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if old, ok := featuresFromFiles[k]; ok {
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log.Printf("WARNING: overriding label '%s': value changed from '%s' to '%s'",
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k, old, v)
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}
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2019-03-28 00:16:54 +00:00
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featuresFromFiles[k] = v
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}
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return featuresFromFiles, nil
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}
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func parseFeatures(lines [][]byte, prefix string) source.Features {
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features := source.Features{}
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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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// Check if we need to add prefix
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2019-04-05 22:31:40 +00:00
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var key string
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if strings.Contains(lineSplit[0], "/") {
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if lineSplit[0][0] == '/' {
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key = lineSplit[0][1:]
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} else {
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key = lineSplit[0]
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}
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} else {
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key = prefix + "-" + lineSplit[0]
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}
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// Check if it's a boolean value
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if len(lineSplit) == 1 {
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features[key] = "true"
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} else {
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features[key] = lineSplit[1]
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}
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}
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}
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return features
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}
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// Run all hooks and get features
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func getFeaturesFromHooks() (source.Features, error) {
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2018-07-13 12:55:28 +00:00
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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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fileName := file.Name()
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lines, err := runHook(fileName)
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2018-07-13 12:55:28 +00:00
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if err != nil {
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log.Printf("ERROR: source local failed running hook '%v': %v", fileName, err)
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2018-07-13 12:55:28 +00:00
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continue
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}
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2019-03-28 00:16:54 +00:00
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// Append features
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for k, v := range parseFeatures(lines, fileName) {
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if old, ok := features[k]; ok {
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log.Printf("WARNING: overriding label '%s' from another hook (%s): value changed from '%s' to '%s'",
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k, fileName, old, v)
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2018-11-26 12:18:05 +00:00
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}
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2019-03-28 00:16:54 +00:00
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features[k] = v
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2018-07-13 12:55:28 +00:00
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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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2019-03-28 00:16:54 +00:00
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func runHook(file string) ([][]byte, error) {
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var lines [][]byte
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2018-07-13 12:55:28 +00:00
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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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2019-03-28 00:16:54 +00:00
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return lines, err
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2018-07-13 12:55:28 +00:00
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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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errLines := bytes.Split(stderr.Bytes(), []byte("\n"))
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for i, line := range errLines {
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if i == len(errLines)-1 && len(line) == 0 {
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2018-07-13 12:55:28 +00:00
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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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2019-03-28 00:16:54 +00:00
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// Do not return any lines if an error occurred
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2018-07-13 12:55:28 +00:00
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if err != nil {
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return lines, err
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2018-07-13 12:55:28 +00:00
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}
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lines = bytes.Split(stdout.Bytes(), []byte("\n"))
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}
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return lines, nil
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}
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// Read all files to get features
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func getFeaturesFromFiles() (source.Features, error) {
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features := source.Features{}
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files, err := ioutil.ReadDir(featureFilesDir)
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if err != nil {
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if os.IsNotExist(err) {
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log.Printf("ERROR: features directory %v does not exist", featureFilesDir)
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return features, nil
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}
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return features, fmt.Errorf("Unable to access %v: %v", featureFilesDir, err)
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}
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for _, file := range files {
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fileName := file.Name()
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lines, err := getFileContent(fileName)
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if err != nil {
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log.Printf("ERROR: source local failed reading file '%v': %v", fileName, err)
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continue
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}
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// Append features
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for k, v := range parseFeatures(lines, fileName) {
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if old, ok := features[k]; ok {
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log.Printf("WARNING: overriding label '%s' from another features.d file (%s): value changed from '%s' to '%s'",
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k, fileName, old, v)
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2018-07-13 12:55:28 +00:00
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}
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2019-03-28 00:16:54 +00:00
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features[k] = v
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2018-07-13 12:55:28 +00:00
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}
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}
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return features, nil
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}
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2019-03-28 00:16:54 +00:00
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// Read one file
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func getFileContent(fileName string) ([][]byte, error) {
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var lines [][]byte
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path := filepath.Join(featureFilesDir, fileName)
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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 lines, err
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}
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if filestat.Mode().IsRegular() {
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fileContent, err := ioutil.ReadFile(path)
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// Do not return any lines if an error occurred
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if err != nil {
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return lines, err
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}
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lines = bytes.Split(fileContent, []byte("\n"))
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}
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return lines, nil
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}
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