lxd/db/schema/update.go
func DotGo(updates map[int]Update, name string) error {
	// Apply all the updates that we have on a pristine database and dump
	// the resulting schema.
	db, err := sql.Open("sqlite3", ":memory:")
	if err != nil {
		return fmt.Errorf("failed to open schema.go for writing: %v", err)
	}

	schema := NewFromMap(updates)

	_, err = schema.Ensure(db)
	if err != nil {
		return err
	}

	dump, err := schema.Dump(db)
	if err != nil {
		return err
	}

	// Passing 1 to runtime.Caller identifies our caller.
	_, filename, _, _ := runtime.Caller(1)

	file, err := os.Create(path.Join(path.Dir(filename), name+".go"))
	if err != nil {
		return fmt.Errorf("failed to open Go file for writing: %v", err)
	}

	pkg := path.Base(path.Dir(filename))
	_, err = file.Write([]byte(fmt.Sprintf(dotGoTemplate, pkg, dump)))
	if err != nil {
		return fmt.Errorf("failed to write to Go file: %v", err)
	}

	return nil
}
func DotGo(updates map[int]Update, name string) error {
	// Apply all the updates that we have on a pristine database and dump
	// the resulting schema.
	db, err := sql.Open("sqlite3", ":memory:")
	if err != nil {
		return fmt.Errorf("failed to open schema.go for writing: %v", err)
	}

	schema := NewFromMap(updates)

	_, err = schema.Ensure(db)
	if err != nil {
		return err
	}

	dump, err := schema.Dump(db)
	if err != nil {
		return err
	}

	// Passing 1 to runtime.Caller identifies our caller.
	_, filename, _, _ := runtime.Caller(1)

	file, err := os.Create(path.Join(path.Dir(filename), name+".go"))
	if err != nil {
		return fmt.Errorf("failed to open Go file for writing: %v", err)
	}

	pkg := path.Base(path.Dir(filename))
	_, err = file.Write([]byte(fmt.Sprintf(dotGoTemplate, pkg, dump)))
	if err != nil {
		return fmt.Errorf("failed to write to Go file: %v", err)
	}

	return nil
}
// DotGo writes '<name>.go' source file in the package of the calling function, containing
// SQL statements that match the given schema updates.
//
// The <name>.go file contains a "flattened" render of all given updates and
// can be used to initialize brand new databases using Schema.Fresh().