func (d *driver) Restore(c *execdriver.Command) error {
var nspid int
f, err := os.Open(filepath.Join(d.root, c.ID, "pid"))
if err != nil {
return err
}
defer d.removeContainerRoot(c.ID)
if _, err := fmt.Fscanf(f, "%d", &nspid); err != nil {
f.Close()
return err
}
f.Close()
if _, err := os.FindProcess(nspid); err != nil {
return fmt.Errorf("finding existing pid %d %s", nspid, err)
}
c.Process = &os.Process{
Pid: nspid,
}
ticker := time.NewTicker(500 * time.Millisecond)
defer ticker.Stop()
for _ = range ticker.C {
if err := syscall.Kill(nspid, 0); err != nil {
if strings.Contains(err.Error(), "no such process") {
return nil
}
return fmt.Errorf("signal error %s", err)
}
}
return nil
}
