lbcd/upgrade.go

// Copyright (c) 2013 Conformal Systems LLC.
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.

package main

import (
	"os"
	"path/filepath"
)

// upgradeDBPathNet moves the database for a specific network from its
// location prior to btcd version 0.2.0 and uses heuristics to ascertain the old
// database type to rename to the new format.
func upgradeDBPathNet(oldDbPath, netName string) error {
	// Prior to version 0.2.0, the database was named the same thing for
	// both sqlite and leveldb.  Use heuristics to figure out the type
	// of the database and move it to the new path and name introduced with
	// version 0.2.0 accordingly.
	fi, err := os.Stat(oldDbPath)
	if err == nil {
		oldDbType := "sqlite"
		if fi.IsDir() {
			oldDbType = "leveldb"
		}

		// The new database name is based on the database type and
		// resides in the a directory named after the network type.
		newDbRoot := filepath.Join(filepath.Dir(cfg.DataDir), netName)
		newDbName := blockDbNamePrefix + "_" + oldDbType
		if oldDbType == "sqlite" {
			newDbName = newDbName + ".db"
		}
		newDbPath := filepath.Join(newDbRoot, newDbName)

		// Create the new path if needed.
		err = os.MkdirAll(newDbRoot, 0700)
		if err != nil {
			return err
		}

		// Move and rename the old database.
		err := os.Rename(oldDbPath, newDbPath)
		if err != nil {
			return err
		}
	}

	return nil
}

// upgradeDBPaths moves the databases from their locations prior to btcd
// version 0.2.0 to their new locations.
func upgradeDBPaths() error {
	// Prior to version 0.2.0, the databases were in the "db" directory and
	// their names were suffixed by "testnet" and "regtest" for their
	// respective networks.  Check for the old database and update it to the
	// new path introduced with version 0.2.0 accodingly.
	oldDbRoot := filepath.Join(btcdHomeDir(), "db")
	upgradeDBPathNet(filepath.Join(oldDbRoot, "btcd.db"), "mainnet")
	upgradeDBPathNet(filepath.Join(oldDbRoot, "btcd_testnet.db"), "testnet")
	upgradeDBPathNet(filepath.Join(oldDbRoot, "btcd_regtest.db"), "regtest")

	// Remove the old db directory.
	err := os.RemoveAll(oldDbRoot)
	if err != nil {
		return err
	}

	return nil
}

// doUpgrades performs upgrades to btcd as new versions require it.
func doUpgrades() error {
	return upgradeDBPaths()
}