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lockfile.go
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lockfile.go
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/*
*
* Copyright 2024 tofuutils 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 lockfile
import (
"os"
"os/signal"
"path/filepath"
"sync"
"time"
"github.com/hashicorp/go-hclog"
"github.com/tofuutils/tenv/pkg/loghelper"
)
const (
msgWrite = "can not write .lock file, will retry"
msgDelete = "can not remove .lock file"
)
// ! dirPath must already exist (no mkdir here).
// the returned function must be used to delete the lock.
func Write(dirPath string, displayer loghelper.Displayer) func() {
lockPath := filepath.Join(dirPath, ".lock")
for logLevel := hclog.Warn; true; logLevel = hclog.Info {
_, err := os.OpenFile(lockPath, os.O_CREATE|os.O_EXCL, 0644) //nolint
if err == nil {
break
}
displayer.Log(logLevel, msgWrite, loghelper.Error, err)
time.Sleep(time.Second)
}
return sync.OnceFunc(func() { //nolint
if err := os.RemoveAll(lockPath); err != nil {
displayer.Log(hclog.Warn, msgDelete, loghelper.Error, err)
}
})
}
// the returned function may be used to avoid goroutine leak
// (also avoid conflicting behavior with versionmanager/proxy.transmitIncreasingSignal).
func CleanAndExitOnInterrupt(clean func()) func() {
signalChan := make(chan os.Signal)
endChan := make(chan struct{})
signal.Notify(signalChan, os.Interrupt)
go func() {
for {
select {
case <-signalChan:
clean()
os.Exit(1)
case <-endChan:
signal.Stop(signalChan)
break
}
}
}()
return sync.OnceFunc(func() { //nolint
endChan <- struct{}{}
})
}