syncthing/lib/config/config.go

843 lines
23 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 config implements reading and writing of the syncthing configuration file.
package config
import (
"encoding/json"
"encoding/xml"
"fmt"
"io"
"io/ioutil"
"net"
"net/url"
"os"
"path"
"path/filepath"
"runtime"
"sort"
"strconv"
"strings"
"github.com/syncthing/syncthing/lib/fs"
"github.com/syncthing/syncthing/lib/protocol"
"github.com/syncthing/syncthing/lib/rand"
"github.com/syncthing/syncthing/lib/upgrade"
"github.com/syncthing/syncthing/lib/util"
)
const (
OldestHandledVersion = 10
CurrentVersion = 28
MaxRescanIntervalS = 365 * 24 * 60 * 60
)
var (
// DefaultTCPPort defines default TCP port used if the URI does not specify one, for example tcp://0.0.0.0
DefaultTCPPort = 22000
// DefaultListenAddresses should be substituted when the configuration
// contains <listenAddress>default</listenAddress>. This is done by the
// "consumer" of the configuration as we don't want these saved to the
// config.
DefaultListenAddresses = []string{
util.Address("tcp", net.JoinHostPort("0.0.0.0", strconv.Itoa(DefaultTCPPort))),
"dynamic+https://relays.syncthing.net/endpoint",
}
// DefaultDiscoveryServersV4 should be substituted when the configuration
// contains <globalAnnounceServer>default-v4</globalAnnounceServer>.
DefaultDiscoveryServersV4 = []string{
"https://discovery.syncthing.net/v2/?noannounce&id=LYXKCHX-VI3NYZR-ALCJBHF-WMZYSPK-QG6QJA3-MPFYMSO-U56GTUK-NA2MIAW",
"https://discovery-v4.syncthing.net/v2/?nolookup&id=LYXKCHX-VI3NYZR-ALCJBHF-WMZYSPK-QG6QJA3-MPFYMSO-U56GTUK-NA2MIAW",
}
// DefaultDiscoveryServersV6 should be substituted when the configuration
// contains <globalAnnounceServer>default-v6</globalAnnounceServer>.
DefaultDiscoveryServersV6 = []string{
"https://discovery.syncthing.net/v2/?noannounce&id=LYXKCHX-VI3NYZR-ALCJBHF-WMZYSPK-QG6QJA3-MPFYMSO-U56GTUK-NA2MIAW",
"https://discovery-v6.syncthing.net/v2/?nolookup&id=LYXKCHX-VI3NYZR-ALCJBHF-WMZYSPK-QG6QJA3-MPFYMSO-U56GTUK-NA2MIAW",
}
// DefaultDiscoveryServers should be substituted when the configuration
// contains <globalAnnounceServer>default</globalAnnounceServer>.
DefaultDiscoveryServers = append(DefaultDiscoveryServersV4, DefaultDiscoveryServersV6...)
// DefaultTheme is the default and fallback theme for the web UI.
DefaultTheme = "default"
)
func New(myID protocol.DeviceID) Configuration {
var cfg Configuration
cfg.Version = CurrentVersion
cfg.OriginalVersion = CurrentVersion
util.SetDefaults(&cfg)
util.SetDefaults(&cfg.Options)
util.SetDefaults(&cfg.GUI)
// Can't happen.
if err := cfg.prepare(myID); err != nil {
panic("bug: error in preparing new folder: " + err.Error())
}
return cfg
}
func ReadXML(r io.Reader, myID protocol.DeviceID) (Configuration, error) {
var cfg Configuration
util.SetDefaults(&cfg)
util.SetDefaults(&cfg.Options)
util.SetDefaults(&cfg.GUI)
if err := xml.NewDecoder(r).Decode(&cfg); err != nil {
return Configuration{}, err
}
cfg.OriginalVersion = cfg.Version
if err := cfg.prepare(myID); err != nil {
return Configuration{}, err
}
return cfg, nil
}
func ReadJSON(r io.Reader, myID protocol.DeviceID) (Configuration, error) {
var cfg Configuration
util.SetDefaults(&cfg)
util.SetDefaults(&cfg.Options)
util.SetDefaults(&cfg.GUI)
bs, err := ioutil.ReadAll(r)
if err != nil {
return Configuration{}, err
}
if err := json.Unmarshal(bs, &cfg); err != nil {
return Configuration{}, err
}
cfg.OriginalVersion = cfg.Version
if err := cfg.prepare(myID); err != nil {
return Configuration{}, err
}
return cfg, nil
}
type Configuration struct {
Version int `xml:"version,attr" json:"version"`
Folders []FolderConfiguration `xml:"folder" json:"folders"`
Devices []DeviceConfiguration `xml:"device" json:"devices"`
GUI GUIConfiguration `xml:"gui" json:"gui"`
LDAP LDAPConfiguration `xml:"ldap" json:"ldap"`
Options OptionsConfiguration `xml:"options" json:"options"`
IgnoredDevices []ObservedDevice `xml:"remoteIgnoredDevice" json:"remoteIgnoredDevices"`
PendingDevices []ObservedDevice `xml:"pendingDevice" json:"pendingDevices"`
XMLName xml.Name `xml:"configuration" json:"-"`
MyID protocol.DeviceID `xml:"-" json:"-"` // Provided by the instantiator.
OriginalVersion int `xml:"-" json:"-"` // The version we read from disk, before any conversion
}
func (cfg Configuration) Copy() Configuration {
newCfg := cfg
// Deep copy FolderConfigurations
newCfg.Folders = make([]FolderConfiguration, len(cfg.Folders))
for i := range newCfg.Folders {
newCfg.Folders[i] = cfg.Folders[i].Copy()
}
// Deep copy DeviceConfigurations
newCfg.Devices = make([]DeviceConfiguration, len(cfg.Devices))
for i := range newCfg.Devices {
newCfg.Devices[i] = cfg.Devices[i].Copy()
}
newCfg.Options = cfg.Options.Copy()
newCfg.GUI = cfg.GUI.Copy()
// DeviceIDs are values
newCfg.IgnoredDevices = make([]ObservedDevice, len(cfg.IgnoredDevices))
copy(newCfg.IgnoredDevices, cfg.IgnoredDevices)
newCfg.PendingDevices = make([]ObservedDevice, len(cfg.PendingDevices))
copy(newCfg.PendingDevices, cfg.PendingDevices)
return newCfg
}
func (cfg *Configuration) WriteXML(w io.Writer) error {
e := xml.NewEncoder(w)
e.Indent("", " ")
err := e.Encode(cfg)
if err != nil {
return err
}
_, err = w.Write([]byte("\n"))
return err
}
func (cfg *Configuration) prepare(myID protocol.DeviceID) error {
var myName string
cfg.MyID = myID
// Ensure this device is present in the config
for _, device := range cfg.Devices {
if device.DeviceID == myID {
goto found
}
}
myName, _ = os.Hostname()
cfg.Devices = append(cfg.Devices, DeviceConfiguration{
DeviceID: myID,
Name: myName,
})
found:
if err := cfg.clean(); err != nil {
return err
}
// Ensure that we are part of the devices
for i := range cfg.Folders {
cfg.Folders[i].Devices = ensureDevicePresent(cfg.Folders[i].Devices, myID)
}
return nil
}
func (cfg *Configuration) clean() error {
util.FillNilSlices(&cfg.Options)
// Prepare folders and check for duplicates. Duplicates are bad and
// dangerous, can't currently be resolved in the GUI, and shouldn't
// happen when configured by the GUI. We return with an error in that
// situation.
existingFolders := make(map[string]*FolderConfiguration)
for i := range cfg.Folders {
folder := &cfg.Folders[i]
folder.prepare()
if folder.ID == "" {
return fmt.Errorf("folder with empty ID in configuration")
}
if _, ok := existingFolders[folder.ID]; ok {
return fmt.Errorf("duplicate folder ID %q in configuration", folder.ID)
}
existingFolders[folder.ID] = folder
}
cfg.Options.ListenAddresses = util.UniqueStrings(cfg.Options.ListenAddresses)
cfg.Options.GlobalAnnServers = util.UniqueStrings(cfg.Options.GlobalAnnServers)
if cfg.Version > 0 && cfg.Version < OldestHandledVersion {
l.Warnf("Configuration version %d is deprecated. Attempting best effort conversion, but please verify manually.", cfg.Version)
}
// Upgrade configuration versions as appropriate
if cfg.Version <= 10 {
convertV10V11(cfg)
}
if cfg.Version == 11 {
convertV11V12(cfg)
}
if cfg.Version == 12 {
convertV12V13(cfg)
}
if cfg.Version == 13 {
convertV13V14(cfg)
}
if cfg.Version == 14 {
convertV14V15(cfg)
}
if cfg.Version == 15 {
convertV15V16(cfg)
}
if cfg.Version == 16 {
convertV16V17(cfg)
}
if cfg.Version == 17 {
convertV17V18(cfg)
}
if cfg.Version == 18 {
convertV18V19(cfg)
}
if cfg.Version == 19 {
convertV19V20(cfg)
}
if cfg.Version == 20 {
convertV20V21(cfg)
}
if cfg.Version == 21 {
convertV21V22(cfg)
}
if cfg.Version == 22 {
convertV22V23(cfg)
}
if cfg.Version == 23 {
convertV23V24(cfg)
}
if cfg.Version == 24 {
convertV24V25(cfg)
}
if cfg.Version == 25 {
convertV25V26(cfg)
}
if cfg.Version == 26 {
convertV26V27(cfg)
}
if cfg.Version == 27 {
convertV27V28(cfg)
}
// Build a list of available devices
existingDevices := make(map[protocol.DeviceID]bool)
for _, device := range cfg.Devices {
existingDevices[device.DeviceID] = true
}
// Ensure that the device list is
// - free from duplicates
// - sorted by ID
cfg.Devices = ensureNoDuplicateDevices(cfg.Devices)
sort.Slice(cfg.Devices, func(a, b int) bool {
return cfg.Devices[a].DeviceID.Compare(cfg.Devices[b].DeviceID) == -1
})
// Ensure that the folder list is sorted by ID
sort.Slice(cfg.Folders, func(a, b int) bool {
return cfg.Folders[a].ID < cfg.Folders[b].ID
})
// Ensure that in all folder configs
// - any loose devices are not present in the wrong places
// - there are no duplicate devices
// - the versioning configuration parameter map is not nil
sharedFolders := make(map[protocol.DeviceID][]string, len(cfg.Devices))
for i := range cfg.Folders {
cfg.Folders[i].Devices = ensureExistingDevices(cfg.Folders[i].Devices, existingDevices)
cfg.Folders[i].Devices = ensureNoDuplicateFolderDevices(cfg.Folders[i].Devices)
if cfg.Folders[i].Versioning.Params == nil {
cfg.Folders[i].Versioning.Params = map[string]string{}
}
sort.Slice(cfg.Folders[i].Devices, func(a, b int) bool {
return cfg.Folders[i].Devices[a].DeviceID.Compare(cfg.Folders[i].Devices[b].DeviceID) == -1
})
for _, dev := range cfg.Folders[i].Devices {
sharedFolders[dev.DeviceID] = append(sharedFolders[dev.DeviceID], cfg.Folders[i].ID)
}
}
for i := range cfg.Devices {
cfg.Devices[i].prepare(sharedFolders[cfg.Devices[i].DeviceID])
}
// Very short reconnection intervals are annoying
if cfg.Options.ReconnectIntervalS < 5 {
cfg.Options.ReconnectIntervalS = 5
}
if cfg.GUI.APIKey == "" {
cfg.GUI.APIKey = rand.String(32)
}
// The list of ignored devices should not contain any devices that have
// been manually added to the config.
var newIgnoredDevices []ObservedDevice
ignoredDevices := make(map[protocol.DeviceID]bool)
for _, dev := range cfg.IgnoredDevices {
if !existingDevices[dev.ID] {
ignoredDevices[dev.ID] = true
newIgnoredDevices = append(newIgnoredDevices, dev)
}
}
cfg.IgnoredDevices = newIgnoredDevices
// The list of pending devices should not contain devices that were added manually, nor should it contain
// ignored devices.
// Sort by time, so that in case of duplicates latest "time" is used.
sort.Slice(cfg.PendingDevices, func(i, j int) bool {
return cfg.PendingDevices[i].Time.Before(cfg.PendingDevices[j].Time)
})
var newPendingDevices []ObservedDevice
nextPendingDevice:
for _, pendingDevice := range cfg.PendingDevices {
if !existingDevices[pendingDevice.ID] && !ignoredDevices[pendingDevice.ID] {
// Deduplicate
for _, existingPendingDevice := range newPendingDevices {
if existingPendingDevice.ID == pendingDevice.ID {
continue nextPendingDevice
}
}
newPendingDevices = append(newPendingDevices, pendingDevice)
}
}
cfg.PendingDevices = newPendingDevices
// Deprecated protocols are removed from the list of listeners and
// device addresses. So far just kcp*.
for _, prefix := range []string{"kcp"} {
cfg.Options.ListenAddresses = filterURLSchemePrefix(cfg.Options.ListenAddresses, prefix)
for i := range cfg.Devices {
dev := &cfg.Devices[i]
dev.Addresses = filterURLSchemePrefix(dev.Addresses, prefix)
}
}
// Initialize any empty slices
if cfg.Folders == nil {
cfg.Folders = []FolderConfiguration{}
}
if cfg.IgnoredDevices == nil {
cfg.IgnoredDevices = []ObservedDevice{}
}
if cfg.PendingDevices == nil {
cfg.PendingDevices = []ObservedDevice{}
}
if cfg.Options.AlwaysLocalNets == nil {
cfg.Options.AlwaysLocalNets = []string{}
}
if cfg.Options.UnackedNotificationIDs == nil {
cfg.Options.UnackedNotificationIDs = []string{}
}
return nil
}
// DeviceMap returns a map of device ID to device configuration for the given configuration.
func (cfg *Configuration) DeviceMap() map[protocol.DeviceID]DeviceConfiguration {
m := make(map[protocol.DeviceID]DeviceConfiguration, len(cfg.Devices))
for _, dev := range cfg.Devices {
m[dev.DeviceID] = dev
}
return m
}
func convertV27V28(cfg *Configuration) {
// Show a notification about enabling filesystem watching
cfg.Options.UnackedNotificationIDs = append(cfg.Options.UnackedNotificationIDs, "fsWatcherNotification")
cfg.Version = 28
}
func convertV26V27(cfg *Configuration) {
for i := range cfg.Folders {
f := &cfg.Folders[i]
if f.DeprecatedPullers != 0 {
f.PullerMaxPendingKiB = 128 * f.DeprecatedPullers
f.DeprecatedPullers = 0
}
}
cfg.Version = 27
}
func convertV25V26(cfg *Configuration) {
// triggers database update
cfg.Version = 26
}
func convertV24V25(cfg *Configuration) {
for i := range cfg.Folders {
cfg.Folders[i].FSWatcherDelayS = 10
}
cfg.Version = 25
}
func convertV23V24(cfg *Configuration) {
cfg.Options.URSeen = 2
cfg.Version = 24
}
func convertV22V23(cfg *Configuration) {
permBits := fs.FileMode(0777)
if runtime.GOOS == "windows" {
// Windows has no umask so we must chose a safer set of bits to
// begin with.
permBits = 0700
}
// Upgrade code remains hardcoded for .stfolder despite configurable
// marker name in later versions.
for i := range cfg.Folders {
fs := cfg.Folders[i].Filesystem()
// Invalid config posted, or tests.
if fs == nil {
continue
}
if stat, err := fs.Stat(DefaultMarkerName); err == nil && !stat.IsDir() {
err = fs.Remove(DefaultMarkerName)
if err == nil {
err = fs.Mkdir(DefaultMarkerName, permBits)
fs.Hide(DefaultMarkerName) // ignore error
}
if err != nil {
l.Infoln("Failed to upgrade folder marker:", err)
}
}
}
cfg.Version = 23
}
func convertV21V22(cfg *Configuration) {
for i := range cfg.Folders {
cfg.Folders[i].FilesystemType = fs.FilesystemTypeBasic
// Migrate to templated external versioner commands
if cfg.Folders[i].Versioning.Type == "external" {
cfg.Folders[i].Versioning.Params["command"] += " %FOLDER_PATH% %FILE_PATH%"
}
}
cfg.Version = 22
}
func convertV20V21(cfg *Configuration) {
for _, folder := range cfg.Folders {
if folder.FilesystemType != fs.FilesystemTypeBasic {
continue
}
switch folder.Versioning.Type {
case "simple", "trashcan":
// Clean out symlinks in the known place
cleanSymlinks(folder.Filesystem(), ".stversions")
case "staggered":
versionDir := folder.Versioning.Params["versionsPath"]
if versionDir == "" {
// default place
cleanSymlinks(folder.Filesystem(), ".stversions")
} else if filepath.IsAbs(versionDir) {
// absolute
cleanSymlinks(fs.NewFilesystem(fs.FilesystemTypeBasic, versionDir), ".")
} else {
// relative to folder
cleanSymlinks(folder.Filesystem(), versionDir)
}
}
}
cfg.Version = 21
}
func convertV19V20(cfg *Configuration) {
cfg.Options.MinHomeDiskFree = Size{Value: cfg.Options.DeprecatedMinHomeDiskFreePct, Unit: "%"}
cfg.Options.DeprecatedMinHomeDiskFreePct = 0
for i := range cfg.Folders {
cfg.Folders[i].MinDiskFree = Size{Value: cfg.Folders[i].DeprecatedMinDiskFreePct, Unit: "%"}
cfg.Folders[i].DeprecatedMinDiskFreePct = 0
}
cfg.Version = 20
}
func convertV18V19(cfg *Configuration) {
// Triggers a database tweak
cfg.Version = 19
}
func convertV17V18(cfg *Configuration) {
// Do channel selection for existing users. Those who have auto upgrades
// and usage reporting on default to the candidate channel. Others get
// stable.
if cfg.Options.URAccepted > 0 && cfg.Options.AutoUpgradeIntervalH > 0 {
cfg.Options.UpgradeToPreReleases = true
}
// Show a notification to explain what's going on, except if upgrades
// are disabled by compilation or environment variable in which case
// it's not relevant.
if !upgrade.DisabledByCompilation && os.Getenv("STNOUPGRADE") == "" {
cfg.Options.UnackedNotificationIDs = append(cfg.Options.UnackedNotificationIDs, "channelNotification")
}
cfg.Version = 18
}
func convertV16V17(cfg *Configuration) {
// Fsync = true removed
cfg.Version = 17
}
func convertV15V16(cfg *Configuration) {
// Triggers a database tweak
cfg.Version = 16
}
func convertV14V15(cfg *Configuration) {
// Undo v0.13.0 broken migration
for i, addr := range cfg.Options.GlobalAnnServers {
switch addr {
case "default-v4v2/":
cfg.Options.GlobalAnnServers[i] = "default-v4"
case "default-v6v2/":
cfg.Options.GlobalAnnServers[i] = "default-v6"
}
}
cfg.Version = 15
}
func convertV13V14(cfg *Configuration) {
// Not using the ignore cache is the new default. Disable it on existing
// configurations.
cfg.Options.CacheIgnoredFiles = false
// Migrate UPnP -> NAT options
cfg.Options.NATEnabled = cfg.Options.DeprecatedUPnPEnabled
cfg.Options.DeprecatedUPnPEnabled = false
cfg.Options.NATLeaseM = cfg.Options.DeprecatedUPnPLeaseM
cfg.Options.DeprecatedUPnPLeaseM = 0
cfg.Options.NATRenewalM = cfg.Options.DeprecatedUPnPRenewalM
cfg.Options.DeprecatedUPnPRenewalM = 0
cfg.Options.NATTimeoutS = cfg.Options.DeprecatedUPnPTimeoutS
cfg.Options.DeprecatedUPnPTimeoutS = 0
// Replace the default listen address "tcp://0.0.0.0:22000" with the
// string "default", but only if we also have the default relay pool
// among the relay servers as this is implied by the new "default"
// entry.
hasDefault := false
for _, raddr := range cfg.Options.DeprecatedRelayServers {
if raddr == "dynamic+https://relays.syncthing.net/endpoint" {
for i, addr := range cfg.Options.ListenAddresses {
if addr == "tcp://0.0.0.0:22000" {
cfg.Options.ListenAddresses[i] = "default"
hasDefault = true
break
}
}
break
}
}
// Copy relay addresses into listen addresses.
for _, addr := range cfg.Options.DeprecatedRelayServers {
if hasDefault && addr == "dynamic+https://relays.syncthing.net/endpoint" {
// Skip the default relay address if we already have the
// "default" entry in the list.
continue
}
if addr == "" {
continue
}
cfg.Options.ListenAddresses = append(cfg.Options.ListenAddresses, addr)
}
cfg.Options.DeprecatedRelayServers = nil
// For consistency
sort.Strings(cfg.Options.ListenAddresses)
var newAddrs []string
for _, addr := range cfg.Options.GlobalAnnServers {
uri, err := url.Parse(addr)
if err != nil {
// That's odd. Skip the broken address.
continue
}
if uri.Scheme == "https" {
uri.Path = path.Join(uri.Path, "v2") + "/"
addr = uri.String()
}
newAddrs = append(newAddrs, addr)
}
cfg.Options.GlobalAnnServers = newAddrs
for i, fcfg := range cfg.Folders {
if fcfg.DeprecatedReadOnly {
cfg.Folders[i].Type = FolderTypeSendOnly
} else {
cfg.Folders[i].Type = FolderTypeSendReceive
}
cfg.Folders[i].DeprecatedReadOnly = false
}
// v0.13-beta already had config version 13 but did not get the new URL
if cfg.Options.ReleasesURL == "https://api.github.com/repos/syncthing/syncthing/releases?per_page=30" {
cfg.Options.ReleasesURL = "https://upgrades.syncthing.net/meta.json"
}
cfg.Version = 14
}
func convertV12V13(cfg *Configuration) {
if cfg.Options.ReleasesURL == "https://api.github.com/repos/syncthing/syncthing/releases?per_page=30" {
cfg.Options.ReleasesURL = "https://upgrades.syncthing.net/meta.json"
}
cfg.Version = 13
}
func convertV11V12(cfg *Configuration) {
// Change listen address schema
for i, addr := range cfg.Options.ListenAddresses {
if len(addr) > 0 && !strings.HasPrefix(addr, "tcp://") {
cfg.Options.ListenAddresses[i] = util.Address("tcp", addr)
}
}
for i, device := range cfg.Devices {
for j, addr := range device.Addresses {
if addr != "dynamic" && addr != "" {
cfg.Devices[i].Addresses[j] = util.Address("tcp", addr)
}
}
}
// Use new discovery server
var newDiscoServers []string
var useDefault bool
for _, addr := range cfg.Options.GlobalAnnServers {
if addr == "udp4://announce.syncthing.net:22026" {
useDefault = true
} else if addr == "udp6://announce-v6.syncthing.net:22026" {
useDefault = true
} else {
newDiscoServers = append(newDiscoServers, addr)
}
}
if useDefault {
newDiscoServers = append(newDiscoServers, "default")
}
cfg.Options.GlobalAnnServers = newDiscoServers
// Use new multicast group
if cfg.Options.LocalAnnMCAddr == "[ff32::5222]:21026" {
cfg.Options.LocalAnnMCAddr = "[ff12::8384]:21027"
}
// Use new local discovery port
if cfg.Options.LocalAnnPort == 21025 {
cfg.Options.LocalAnnPort = 21027
}
// Set MaxConflicts to unlimited
for i := range cfg.Folders {
cfg.Folders[i].MaxConflicts = -1
}
cfg.Version = 12
}
func convertV10V11(cfg *Configuration) {
// Set minimum disk free of existing folders to 1%
for i := range cfg.Folders {
cfg.Folders[i].DeprecatedMinDiskFreePct = 1
}
cfg.Version = 11
}
func ensureDevicePresent(devices []FolderDeviceConfiguration, myID protocol.DeviceID) []FolderDeviceConfiguration {
for _, device := range devices {
if device.DeviceID.Equals(myID) {
return devices
}
}
devices = append(devices, FolderDeviceConfiguration{
DeviceID: myID,
})
return devices
}
func ensureExistingDevices(devices []FolderDeviceConfiguration, existingDevices map[protocol.DeviceID]bool) []FolderDeviceConfiguration {
count := len(devices)
i := 0
loop:
for i < count {
if _, ok := existingDevices[devices[i].DeviceID]; !ok {
devices[i] = devices[count-1]
count--
continue loop
}
i++
}
return devices[0:count]
}
func ensureNoDuplicateFolderDevices(devices []FolderDeviceConfiguration) []FolderDeviceConfiguration {
count := len(devices)
i := 0
seenDevices := make(map[protocol.DeviceID]bool)
loop:
for i < count {
id := devices[i].DeviceID
if _, ok := seenDevices[id]; ok {
devices[i] = devices[count-1]
count--
continue loop
}
seenDevices[id] = true
i++
}
return devices[0:count]
}
func ensureNoDuplicateDevices(devices []DeviceConfiguration) []DeviceConfiguration {
count := len(devices)
i := 0
seenDevices := make(map[protocol.DeviceID]bool)
loop:
for i < count {
id := devices[i].DeviceID
if _, ok := seenDevices[id]; ok {
devices[i] = devices[count-1]
count--
continue loop
}
seenDevices[id] = true
i++
}
return devices[0:count]
}
func cleanSymlinks(filesystem fs.Filesystem, dir string) {
if runtime.GOOS == "windows" {
// We don't do symlinks on Windows. Additionally, there may
// be things that look like symlinks that are not, which we
// should leave alone. Deduplicated files, for example.
return
}
filesystem.Walk(dir, func(path string, info fs.FileInfo, err error) error {
if err != nil {
return err
}
if info.IsSymlink() {
l.Infoln("Removing incorrectly versioned symlink", path)
filesystem.Remove(path)
return fs.SkipDir
}
return nil
})
}
// filterURLSchemePrefix returns the list of addresses after removing all
// entries whose URL scheme matches the given prefix.
func filterURLSchemePrefix(addrs []string, prefix string) []string {
for i := 0; i < len(addrs); i++ {
uri, err := url.Parse(addrs[i])
if err != nil {
continue
}
if strings.HasPrefix(uri.Scheme, prefix) {
// Remove this entry
copy(addrs[i:], addrs[i+1:])
addrs = addrs[:len(addrs)-1]
i--
}
}
return addrs
}