Method Migrate

tools/clientcmd/loader.go:241–287

Migrate uses the MigrationRules map. If a destination file is not present, then the source file is checked. If the source file is present, then it is copied to the destination file BEFORE any further loading happens.

()

// Migrate uses the MigrationRules map.  If a destination file is not present, then the source file is checked.
// If the source file is present, then it is copied to the destination file BEFORE any further loading happens.
func (rules *ClientConfigLoadingRules) Migrate() error {
	if rules.MigrationRules == nil {
		return nil
	}

	for destination, source := range rules.MigrationRules {
		if _, err := os.Stat(destination); err == nil {
			// if the destination already exists, do nothing
			continue
		} else if os.IsPermission(err) {
			// if we can't access the file, skip it
			continue
		} else if !os.IsNotExist(err) {
			// if we had an error other than non-existence, fail
			return err
		}

		if sourceInfo, err := os.Stat(source); err != nil {
			if os.IsNotExist(err) || os.IsPermission(err) {
				// if the source file doesn't exist or we can't access it, there's no work to do.
				continue
			}

			// if we had an error other than non-existence, fail
			return err
		} else if sourceInfo.IsDir() {
			return fmt.Errorf("cannot migrate %v to %v because it is a directory", source, destination)
		}

		in, err := os.Open(source)
		if err != nil {
			return err
		}
		defer in.Close()
		out, err := os.Create(destination)
		if err != nil {
			return err
		}
		defer out.Close()

		if _, err = io.Copy(out, in); err != nil {
			return err
		}
	}

	return nil
}

// GetLoadingPrecedence implements ConfigAccess
func (rules *ClientConfigLoadingRules) GetLoadingPrecedence() []string {