kubernetes/cluster/images/etcd/migrate/data_dir.go

type DataDirectory …

// OpenOrCreateDataDirectory opens a data directory, creating the directory
// if it doesn't not already exist.
func OpenOrCreateDataDirectory(path string) (*DataDirectory, error) { … }

// Initialize set the version.txt to the target version if the data
// directory is empty. If the data directory is non-empty, no
// version.txt file will be written since the actual version of etcd
// used to create the data is unknown.
func (d *DataDirectory) Initialize(target *EtcdVersionPair) error { … }

// Backup creates a backup copy of data directory.
func (d *DataDirectory) Backup() error { … }

// IsEmpty returns true if the data directory is entirely empty.
func (d *DataDirectory) IsEmpty() (bool, error) { … }

// String returns the data directory path.
func (d *DataDirectory) String() string { … }

type VersionFile …

func (v *VersionFile) nextPath() string { … }

// Exists returns true if a version.txt file exists on the file system.
func (v *VersionFile) Exists() (bool, error) { … }

// Read parses the version.txt file and returns it's contents.
func (v *VersionFile) Read() (*EtcdVersionPair, error) { … }

// equals returns true iff VersionFile exists and contains given EtcdVersionPair.
func (v *VersionFile) equals(vp *EtcdVersionPair) (bool, error) { … }

// Write creates or overwrites the contents of the version.txt file with the given EtcdVersionPair.
func (v *VersionFile) Write(vp *EtcdVersionPair) error { … }

func exists(path string) (bool, error) { … }