示例#1
0
文件: io.go 项目: coderhaoxin/rkt
// getTmpROC returns a removeOnClose instance wrapping a temporary
// file provided by the passed store. The actual file name is based on
// a hash of the passed path.
func getTmpROC(s *store.Store, path string) (*removeOnClose, error) {
	h := sha512.New()
	h.Write([]byte(path))
	pathHash := s.HashToKey(h)

	tmp, err := s.TmpNamedFile(pathHash)
	if err != nil {
		return nil, errwrap.Wrap(errors.New("error setting up temporary file"), err)
	}
	// let's lock the file to avoid concurrent writes to the temporary file, it
	// will go away when removing the temp file
	_, err = lock.TryExclusiveLock(tmp.Name(), lock.RegFile)
	if err != nil {
		if err != lock.ErrLocked {
			return nil, errwrap.Wrap(errors.New("failed to lock temporary file"), err)
		}
		log.Printf("another rkt instance is downloading this file, waiting...")
		_, err = lock.ExclusiveLock(tmp.Name(), lock.RegFile)
		if err != nil {
			return nil, errwrap.Wrap(errors.New("failed to lock temporary file"), err)
		}
	}
	roc := &removeOnClose{File: tmp}
	return roc, nil
}
示例#2
0
文件: io.go 项目: sinfomicien/rkt
// getTmpROC returns a removeOnClose instance wrapping a temporary
// file provided by the passed store. The actual file name is based on
// a hash of the passed path.
func getTmpROC(s *store.Store, path string) (*removeOnClose, error) {
	h := sha512.New()
	h.Write([]byte(path))
	pathHash := s.HashToKey(h)

	tmp, err := s.TmpNamedFile(pathHash)
	if err != nil {
		return nil, errwrap.Wrap(errors.New("error setting up temporary file"), err)
	}
	roc := &removeOnClose{File: tmp}
	return roc, nil
}