Method Migrate

internal/config/config.go:183–210

(m gh.Migration)

}

func (c *cfg) Migrate(m gh.Migration) error {
	// If there is no version entry we must never have applied a migration, and the following conditional logic
	// handles the version as an empty string correctly.
	version := c.Version().UnwrapOrZero()

	// If migration has already occurred then do not attempt to migrate again.
	if m.PostVersion() == version {
		return nil
	}

	// If migration is incompatible with current version then return an error.
	if m.PreVersion() != version {
		return fmt.Errorf("failed to migrate as %q pre migration version did not match config version %q", m.PreVersion(), version)
	}

	if err := m.Do(c.cfg); err != nil {
		return fmt.Errorf("failed to migrate config: %s", err)
	}

	c.Set("", versionKey, m.PostVersion())

	// Then write out our migrated config.
	if err := c.Write(); err != nil {
		return fmt.Errorf("failed to write config after migration: %s", err)
	}

	return nil
}

func (c *cfg) CacheDir() string {
	return ghConfig.CacheDir()