mirror of
https://github.com/octoleo/syncthing.git
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278 lines
9.5 KiB
Go
278 lines
9.5 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package config
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import (
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"errors"
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"fmt"
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"runtime"
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"github.com/syncthing/syncthing/lib/fs"
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"github.com/syncthing/syncthing/lib/protocol"
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"github.com/syncthing/syncthing/lib/util"
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"github.com/syncthing/syncthing/lib/versioner"
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)
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var (
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errPathNotDirectory = errors.New("folder path not a directory")
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errPathMissing = errors.New("folder path missing")
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errMarkerMissing = errors.New("folder marker missing")
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)
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const DefaultMarkerName = ".stfolder"
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type FolderConfiguration struct {
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ID string `xml:"id,attr" json:"id"`
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Label string `xml:"label,attr" json:"label" restart:"false"`
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FilesystemType fs.FilesystemType `xml:"filesystemType" json:"filesystemType"`
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Path string `xml:"path,attr" json:"path"`
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Type FolderType `xml:"type,attr" json:"type"`
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Devices []FolderDeviceConfiguration `xml:"device" json:"devices"`
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RescanIntervalS int `xml:"rescanIntervalS,attr" json:"rescanIntervalS"`
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FSWatcherEnabled bool `xml:"fsWatcherEnabled,attr" json:"fsWatcherEnabled"`
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FSWatcherDelayS int `xml:"fsWatcherDelayS,attr" json:"fsWatcherDelayS"`
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IgnorePerms bool `xml:"ignorePerms,attr" json:"ignorePerms"`
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AutoNormalize bool `xml:"autoNormalize,attr" json:"autoNormalize"`
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MinDiskFree Size `xml:"minDiskFree" json:"minDiskFree"`
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Versioning VersioningConfiguration `xml:"versioning" json:"versioning"`
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Copiers int `xml:"copiers" json:"copiers"` // This defines how many files are handled concurrently.
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Pullers int `xml:"pullers" json:"pullers"` // Defines how many blocks are fetched at the same time, possibly between separate copier routines.
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Hashers int `xml:"hashers" json:"hashers"` // Less than one sets the value to the number of cores. These are CPU bound due to hashing.
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Order PullOrder `xml:"order" json:"order"`
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IgnoreDelete bool `xml:"ignoreDelete" json:"ignoreDelete"`
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ScanProgressIntervalS int `xml:"scanProgressIntervalS" json:"scanProgressIntervalS"` // Set to a negative value to disable. Value of 0 will get replaced with value of 2 (default value)
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PullerPauseS int `xml:"pullerPauseS" json:"pullerPauseS"`
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MaxConflicts int `xml:"maxConflicts" json:"maxConflicts"`
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DisableSparseFiles bool `xml:"disableSparseFiles" json:"disableSparseFiles"`
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DisableTempIndexes bool `xml:"disableTempIndexes" json:"disableTempIndexes"`
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Paused bool `xml:"paused" json:"paused"`
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WeakHashThresholdPct int `xml:"weakHashThresholdPct" json:"weakHashThresholdPct"` // Use weak hash if more than X percent of the file has changed. Set to -1 to always use weak hash.
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MarkerName string `xml:"markerName" json:"markerName"`
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cachedFilesystem fs.Filesystem
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DeprecatedReadOnly bool `xml:"ro,attr,omitempty" json:"-"`
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DeprecatedMinDiskFreePct float64 `xml:"minDiskFreePct,omitempty" json:"-"`
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}
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type FolderDeviceConfiguration struct {
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DeviceID protocol.DeviceID `xml:"id,attr" json:"deviceID"`
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IntroducedBy protocol.DeviceID `xml:"introducedBy,attr" json:"introducedBy"`
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}
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func NewFolderConfiguration(myID protocol.DeviceID, id, label string, fsType fs.FilesystemType, path string) FolderConfiguration {
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f := FolderConfiguration{
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ID: id,
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Label: label,
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RescanIntervalS: 60,
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FSWatcherDelayS: 10,
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MinDiskFree: Size{Value: 1, Unit: "%"},
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Devices: []FolderDeviceConfiguration{{DeviceID: myID}},
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AutoNormalize: true,
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MaxConflicts: -1,
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FilesystemType: fsType,
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Path: path,
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}
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f.prepare()
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return f
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}
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func (f FolderConfiguration) Copy() FolderConfiguration {
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c := f
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c.Devices = make([]FolderDeviceConfiguration, len(f.Devices))
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copy(c.Devices, f.Devices)
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c.Versioning = f.Versioning.Copy()
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return c
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}
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func (f FolderConfiguration) Filesystem() fs.Filesystem {
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// This is intentionally not a pointer method, because things like
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// cfg.Folders["default"].Filesystem() should be valid.
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if f.cachedFilesystem == nil && f.Path != "" {
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l.Infoln("bug: uncached filesystem call (should only happen in tests)")
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return fs.NewFilesystem(f.FilesystemType, f.Path)
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}
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return f.cachedFilesystem
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}
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func (f FolderConfiguration) Versioner() versioner.Versioner {
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if f.Versioning.Type == "" {
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return nil
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}
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versionerFactory, ok := versioner.Factories[f.Versioning.Type]
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if !ok {
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l.Fatalf("Requested versioning type %q that does not exist", f.Versioning.Type)
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}
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return versionerFactory(f.ID, f.Filesystem(), f.Versioning.Params)
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}
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func (f *FolderConfiguration) CreateMarker() error {
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if err := f.CheckPath(); err != errMarkerMissing {
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return err
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}
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if f.MarkerName != DefaultMarkerName {
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// Folder uses a non-default marker so we shouldn't mess with it.
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// Pretend we created it and let the subsequent health checks sort
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// out the actual situation.
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return nil
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}
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permBits := fs.FileMode(0777)
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if runtime.GOOS == "windows" {
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// Windows has no umask so we must chose a safer set of bits to
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// begin with.
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permBits = 0700
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}
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fs := f.Filesystem()
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err := fs.Mkdir(DefaultMarkerName, permBits)
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if err != nil {
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return err
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}
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if dir, err := fs.Open("."); err != nil {
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l.Debugln("folder marker: open . failed:", err)
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} else if err := dir.Sync(); err != nil {
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l.Debugln("folder marker: fsync . failed:", err)
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}
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fs.Hide(DefaultMarkerName)
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return nil
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}
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// CheckPath returns nil if the folder root exists and contains the marker file
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func (f *FolderConfiguration) CheckPath() error {
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fi, err := f.Filesystem().Stat(".")
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if err != nil {
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if !fs.IsNotExist(err) {
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return err
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}
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return errPathMissing
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}
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// Users might have the root directory as a symlink or reparse point.
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// Furthermore, OneDrive bullcrap uses a magic reparse point to the cloudz...
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// Yet it's impossible for this to happen, as filesystem adds a trailing
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// path separator to the root, so even if you point the filesystem at a file
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// Stat ends up calling stat on C:\dir\file\ which, fails with "is not a directory"
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// in the error check above, and we don't even get to here.
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if !fi.IsDir() && !fi.IsSymlink() {
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return errPathNotDirectory
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}
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_, err = f.Filesystem().Stat(f.MarkerName)
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if err != nil {
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if !fs.IsNotExist(err) {
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return err
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}
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return errMarkerMissing
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}
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return nil
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}
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func (f *FolderConfiguration) CreateRoot() (err error) {
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// Directory permission bits. Will be filtered down to something
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// sane by umask on Unixes.
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permBits := fs.FileMode(0777)
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if runtime.GOOS == "windows" {
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// Windows has no umask so we must chose a safer set of bits to
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// begin with.
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permBits = 0700
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}
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filesystem := f.Filesystem()
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if _, err = filesystem.Stat("."); fs.IsNotExist(err) {
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if err = filesystem.MkdirAll(".", permBits); err != nil {
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l.Warnf("Creating directory for %v: %v", f.Description(), err)
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}
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}
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return err
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}
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func (f FolderConfiguration) Description() string {
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if f.Label == "" {
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return f.ID
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}
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return fmt.Sprintf("%q (%s)", f.Label, f.ID)
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}
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func (f *FolderConfiguration) DeviceIDs() []protocol.DeviceID {
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deviceIDs := make([]protocol.DeviceID, len(f.Devices))
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for i, n := range f.Devices {
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deviceIDs[i] = n.DeviceID
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}
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return deviceIDs
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}
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func (f *FolderConfiguration) prepare() {
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if f.Path != "" {
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f.cachedFilesystem = fs.NewFilesystem(f.FilesystemType, f.Path)
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}
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if f.RescanIntervalS > MaxRescanIntervalS {
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f.RescanIntervalS = MaxRescanIntervalS
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} else if f.RescanIntervalS < 0 {
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f.RescanIntervalS = 0
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}
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if f.FSWatcherDelayS <= 0 {
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f.FSWatcherEnabled = false
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f.FSWatcherDelayS = 10
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}
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if f.Versioning.Params == nil {
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f.Versioning.Params = make(map[string]string)
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}
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if f.WeakHashThresholdPct == 0 {
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f.WeakHashThresholdPct = 25
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}
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if f.MarkerName == "" {
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f.MarkerName = DefaultMarkerName
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}
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}
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// RequiresRestartOnly returns a copy with only the attributes that require
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// restart on change.
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func (f FolderConfiguration) RequiresRestartOnly() FolderConfiguration {
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copy := f
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// Manual handling for things that are not taken care of by the tag
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// copier, yet should not cause a restart.
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copy.cachedFilesystem = nil
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blank := FolderConfiguration{}
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util.CopyMatchingTag(&blank, ©, "restart", func(v string) bool {
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if len(v) > 0 && v != "false" {
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panic(fmt.Sprintf(`unexpected tag value: %s. expected untagged or "false"`, v))
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}
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return v == "false"
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})
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return copy
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}
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type FolderDeviceConfigurationList []FolderDeviceConfiguration
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func (l FolderDeviceConfigurationList) Less(a, b int) bool {
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return l[a].DeviceID.Compare(l[b].DeviceID) == -1
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}
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func (l FolderDeviceConfigurationList) Swap(a, b int) {
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l[a], l[b] = l[b], l[a]
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}
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func (l FolderDeviceConfigurationList) Len() int {
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return len(l)
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}
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func (f *FolderConfiguration) CheckFreeSpace() (err error) {
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return checkFreeSpace(f.MinDiskFree, f.Filesystem())
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}
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