removeall.go

// RemoveAll removes path and any children it contains.
// It removes everything it can but returns the first error
// it encounters. If the path does not exist, RemoveAll
// returns nil (no error).
func RemoveAll(path string) error {

	// Simple case: if Remove works, we're done.
	err := Remove(path)
	if err == nil || IsNotExist(err) {
		return nil
	}

	// Otherwise, is this a directory we need to recurse into?
	dir, serr := Lstat(path)
	if serr != nil {
		if serr, ok := serr.(*PathError); ok && (IsNotExist(serr.Err) || serr.Err == syscall.ENOTDIR) {
			return nil
		}
		return serr
	}

	if !dir.IsDir() {
		// Not a directory; return the error from Remove.
		return err
	}

	// Directory.
	fd, err := Open(path)
	if err != nil {
		if IsNotExist(err) {
			// Race. It was deleted between the Lstat and Open.
			// Return nil per RemoveAll's docs.
			return nil
		}

		return err
	}

	// Remove contents & return first error.
	err = nil
	for {
		names, err1 := fd.Readdirnames(100)
		for _, name := range names {
			err1 := RemoveAll(path + string(PathSeparator) + name)
			if err == nil {
				err = err1
			}
		}
		if err1 == io.EOF {
			break
		}
		// If Readdirnames returned an error, use it.
		if err == nil {
			err = err1
		}
		if len(names) == 0 {
			break
		}
	}

	// Close directory, because windows won't remove opened directory.
	fd.Close()

	// Remove directory.
	err1 := Remove(path)
	if err1 == nil || IsNotExist(err1) {
		return nil
	}
	if err == nil {
		err = err1
	}

	return err
}