func (u *Update) getPath() (string, error) {
if u.TargetPath == "" {
return osext.Executable()
} else {
return u.TargetPath, nil
}
}
func (u *Updater) update() error {
path, err := osext.Executable()
if err != nil {
return err
}
old, err := os.Open(path)
if err != nil {
return err
}
defer old.Close()
err = u.fetchInfo()
if err != nil {
return err
}
if u.Info.Version == u.CurrentVersion {
return nil
}
bin, err := u.fetchAndVerifyPatch(old)
if err != nil {
if err == ErrHashMismatch {
log.Println("update: hash mismatch from patched binary")
} else {
if u.DiffURL != "" {
log.Println("update: patching binary,", err)
}
}
bin, err = u.fetchAndVerifyFullBin()
if err != nil {
if err == ErrHashMismatch {
log.Println("update: hash mismatch from full binary")
} else {
log.Println("update: fetching full binary,", err)
}
return err
}
}
// close the old binary before installing because on windows
// it can't be renamed if a handle to the file is still open
old.Close()
err, errRecover := up.FromStream(bytes.NewBuffer(bin))
if errRecover != nil {
return fmt.Errorf("update and recovery errors: %q %q", err, errRecover)
}
if err != nil {
return err
}
return nil
}
func defaultChecksum() string {
path, err := osext.Executable()
if err != nil {
return ""
}
checksum, err := update.ChecksumForFile(path)
if err != nil {
return ""
}
return hex.EncodeToString(checksum)
}
func (u *Updater) getExecRelativeDir(dir string) string {
filename, _ := osext.Executable()
path := filepath.Join(filepath.Dir(filename), dir)
return path
}