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f307e97f87
This patch adds the --exit-on-lock-contention flag, which must be used in conjunction with the --lock-file flag. When provided, it causes the kubelet to wait for inotify events for that lock file. When an 'open' event is received, the kubelet will exit.
45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors All rights reserved.
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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 app
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import (
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"github.com/golang/glog"
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"golang.org/x/exp/inotify"
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)
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func watchForLockfileContention(path string, done chan struct{}) error {
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watcher, err := inotify.NewWatcher()
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if err != nil {
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glog.Errorf("unable to create watcher for lockfile: %v", err)
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return err
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}
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if err = watcher.AddWatch(path, inotify.IN_OPEN|inotify.IN_DELETE_SELF); err != nil {
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glog.Errorf("unable to watch lockfile: %v", err)
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return err
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}
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go func() {
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select {
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case ev := <-watcher.Event:
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glog.Infof("inotify event: %v", ev)
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case err = <-watcher.Error:
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glog.Errorf("inotify watcher error: %v", err)
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}
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close(done)
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}()
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return nil
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}
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