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Merge pull request #2619 from bryan-cox/aro-hcp-cert
feat: add a file watcher for Azure client cert auth
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| /* | ||
| Copyright 2024 The Kubernetes Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package filewatcher | ||
|
|
||
| import ( | ||
| "os" | ||
| "path/filepath" | ||
| "sync" | ||
|
|
||
| "github.com/fsnotify/fsnotify" | ||
| "k8s.io/klog/v2" | ||
| ) | ||
|
|
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| var watchCertificateFileOnce sync.Once | ||
|
|
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| // WatchFileForChanges watches the file, fileToWatch, for changes. If the file contents have changed, the pod this | ||
| // function is running on will be restarted. | ||
| func WatchFileForChanges(fileToWatch string) error { | ||
| var err error | ||
|
|
||
| // This starts only one occurrence of the file watcher, which watches the file, fileToWatch. | ||
| watchCertificateFileOnce.Do(func() { | ||
| klog.Infof("Starting the file change watcher on file, %s", fileToWatch) | ||
|
|
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| // Update the file path to watch in case this is a symlink | ||
| fileToWatch, err = filepath.EvalSymlinks(fileToWatch) | ||
| if err != nil { | ||
| return | ||
| } | ||
| klog.Infof("Watching file, %s", fileToWatch) | ||
|
|
||
| // Start the file watcher to monitor file changes | ||
| go func() { | ||
| err = checkForFileChanges(fileToWatch) | ||
| }() | ||
| }) | ||
| return err | ||
| } | ||
|
|
||
| // checkForFileChanges starts a new file watcher. If the file is changed, the pod running this function will exit. | ||
| func checkForFileChanges(path string) error { | ||
| watcher, err := fsnotify.NewWatcher() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| go func() { | ||
| for { | ||
| select { | ||
| case event, ok := <-watcher.Events: | ||
| if ok && (event.Has(fsnotify.Write) || event.Has(fsnotify.Chmod) || event.Has(fsnotify.Remove)) { | ||
| klog.Infof("file, %s, was modified, exiting...", event.Name) | ||
| os.Exit(0) | ||
| } | ||
| case err, ok := <-watcher.Errors: | ||
| if ok { | ||
| klog.Errorf("file watcher error: %v", err) | ||
| } | ||
| } | ||
| } | ||
| }() | ||
|
|
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| err = watcher.Add(path) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } |