syncthing/lib/syncthing/utils.go

129 lines
4.4 KiB
Go

// Copyright (C) 2014 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package syncthing
import (
"crypto/tls"
"fmt"
"io"
"io/ioutil"
"os"
"github.com/pkg/errors"
"github.com/syncthing/syncthing/lib/config"
"github.com/syncthing/syncthing/lib/db/backend"
"github.com/syncthing/syncthing/lib/events"
"github.com/syncthing/syncthing/lib/fs"
"github.com/syncthing/syncthing/lib/locations"
"github.com/syncthing/syncthing/lib/protocol"
"github.com/syncthing/syncthing/lib/tlsutil"
)
func LoadOrGenerateCertificate(certFile, keyFile string) (tls.Certificate, error) {
cert, err := tls.LoadX509KeyPair(
locations.Get(locations.CertFile),
locations.Get(locations.KeyFile),
)
if err != nil {
l.Infof("Generating ECDSA key and certificate for %s...", tlsDefaultCommonName)
return tlsutil.NewCertificate(
locations.Get(locations.CertFile),
locations.Get(locations.KeyFile),
tlsDefaultCommonName,
deviceCertLifetimeDays,
)
}
return cert, nil
}
func DefaultConfig(path string, myID protocol.DeviceID, evLogger events.Logger, noDefaultFolder bool) (config.Wrapper, error) {
newCfg, err := config.NewWithFreePorts(myID)
if err != nil {
return nil, err
}
if noDefaultFolder {
l.Infoln("We will skip creation of a default folder on first start")
return config.Wrap(path, newCfg, evLogger), nil
}
newCfg.Folders = append(newCfg.Folders, config.NewFolderConfiguration(myID, "default", "Default Folder", fs.FilesystemTypeBasic, locations.Get(locations.DefFolder)))
l.Infoln("Default folder created and/or linked to new config")
return config.Wrap(path, newCfg, evLogger), nil
}
// LoadConfigAtStartup loads an existing config. If it doesn't yet exist, it
// creates a default one, without the default folder if noDefaultFolder is ture.
// Otherwise it checks the version, and archives and upgrades the config if
// necessary or returns an error, if the version isn't compatible.
func LoadConfigAtStartup(path string, cert tls.Certificate, evLogger events.Logger, allowNewerConfig, noDefaultFolder bool) (config.Wrapper, error) {
myID := protocol.NewDeviceID(cert.Certificate[0])
cfg, originalVersion, err := config.Load(path, myID, evLogger)
if fs.IsNotExist(err) {
cfg, err = DefaultConfig(path, myID, evLogger, noDefaultFolder)
if err != nil {
return nil, errors.Wrap(err, "failed to generate default config")
}
err = cfg.Save()
if err != nil {
return nil, errors.Wrap(err, "failed to save default config")
}
l.Infof("Default config saved. Edit %s to taste (with Syncthing stopped) or use the GUI", cfg.ConfigPath())
} else if err == io.EOF {
return nil, errors.New("failed to load config: unexpected end of file. Truncated or empty configuration?")
} else if err != nil {
return nil, errors.Wrap(err, "failed to load config")
}
if originalVersion != config.CurrentVersion {
if originalVersion == config.CurrentVersion+1101 {
l.Infof("Now, THAT's what we call a config from the future! Don't worry. As long as you hit that wire with the connecting hook at precisely eighty-eight miles per hour the instant the lightning strikes the tower... everything will be fine.")
}
if originalVersion > config.CurrentVersion && !allowNewerConfig {
return nil, fmt.Errorf("config file version (%d) is newer than supported version (%d). If this is expected, use -allow-newer-config to override.", originalVersion, config.CurrentVersion)
}
err = archiveAndSaveConfig(cfg, originalVersion)
if err != nil {
return nil, errors.Wrap(err, "config archive")
}
}
return cfg, nil
}
func archiveAndSaveConfig(cfg config.Wrapper, originalVersion int) error {
// Copy the existing config to an archive copy
archivePath := cfg.ConfigPath() + fmt.Sprintf(".v%d", originalVersion)
l.Infoln("Archiving a copy of old config file format at:", archivePath)
if err := copyFile(cfg.ConfigPath(), archivePath); err != nil {
return err
}
// Do a regular atomic config sve
return cfg.Save()
}
func copyFile(src, dst string) error {
bs, err := ioutil.ReadFile(src)
if err != nil {
return err
}
if err := ioutil.WriteFile(dst, bs, 0600); err != nil {
// Attempt to clean up
os.Remove(dst)
return err
}
return nil
}
func OpenDBBackend(path string, tuning config.Tuning) (backend.Backend, error) {
return backend.Open(path, backend.Tuning(tuning))
}