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pid.go
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pid.go
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package main
import (
"fmt"
"io/ioutil"
"log"
"os"
"strconv"
)
var pidFile = os.TempDir() + "/.terraform-backend-git.pid"
func readPid() (int, error) {
piddata, err := ioutil.ReadFile(pidFile)
if err != nil {
if os.IsNotExist(err) {
return -1, nil
}
return -1, err
}
pid, err := strconv.Atoi(string(piddata))
if err != nil {
return -1, err
}
return pid, nil
}
func pidRunning() (int, error) {
pid, err := readPid()
if err != nil {
return -1, err
}
if pid <= 0 {
return -1, nil
}
running, err := processRunning(pid)
if err != nil || !running {
return -1, err
}
return pid, nil
}
func lockPidFile() error {
pid, err := pidRunning()
if err != nil {
return err
}
if pid > 0 {
return fmt.Errorf("another pid already running: %d", pid)
}
return ioutil.WriteFile(pidFile, []byte(fmt.Sprintf("%d", os.Getpid())), 0664)
}
func stopPidFile() error {
pid, err := pidRunning()
if err != nil {
log.Fatal(err)
}
if pid <= 0 {
return nil
}
if err := processKill(pid); err != nil {
log.Fatal(err)
}
if err := os.Remove(pidFile); err != nil {
log.Fatal(err)
}
return nil
}