func waitForPath(op trace.Operation, path string) error {
defer trace.End(trace.Begin(path))
timeout := time.Duration(pathTimeout)
op, _ = trace.WithTimeout(&op, timeout, path)
done := make(chan struct{})
go func() {
t := time.NewTicker(200 * time.Microsecond)
defer t.Stop()
for range t.C {
if _, err := os.Stat(path); err == nil {
close(done)
break
}
// We've timed out.
if op.Err() != nil {
break
}
}
}()
log.Debugf("Waiting for attached disk to appear in /dev/disk/by-path, or timeout")
select {
case <-done:
log.Infof("Attached disk present at %s", path)
case <-op.Done():
if op.Err() != nil {
return errors.Errorf("timeout waiting for layer to present as %s", path)
}
}
return nil
}
