syncthing/lib/versioner/simple.go
Audrius Butkevicius 0ca1f26ff8
lib/versioner: Restore for all versioners, cross-device support (#5514)
* lib/versioner: Restore for all versioners, cross-device support

Fixes #4631
Fixes #4586
Fixes #1634
Fixes #5338
Fixes #5419
2019-04-28 23:30:16 +01:00

96 lines
2.5 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 versioner
import (
"path/filepath"
"strconv"
"time"
"github.com/syncthing/syncthing/lib/fs"
"github.com/syncthing/syncthing/lib/util"
)
func init() {
// Register the constructor for this type of versioner with the name "simple"
Factories["simple"] = NewSimple
}
type Simple struct {
keep int
folderFs fs.Filesystem
versionsFs fs.Filesystem
}
func NewSimple(folderID string, folderFs fs.Filesystem, params map[string]string) Versioner {
keep, err := strconv.Atoi(params["keep"])
if err != nil {
keep = 5 // A reasonable default
}
s := Simple{
keep: keep,
folderFs: folderFs,
versionsFs: fsFromParams(folderFs, params),
}
l.Debugf("instantiated %#v", s)
return s
}
// Archive moves the named file away to a version archive. If this function
// returns nil, the named file does not exist any more (has been archived).
func (v Simple) Archive(filePath string) error {
err := archiveFile(v.folderFs, v.versionsFs, filePath, TagFilename)
if err != nil {
return err
}
file := filepath.Base(filePath)
dir := filepath.Dir(filePath)
// Glob according to the new file~timestamp.ext pattern.
pattern := filepath.Join(dir, TagFilename(file, TimeGlob))
newVersions, err := v.versionsFs.Glob(pattern)
if err != nil {
l.Warnln("globbing:", err, "for", pattern)
return nil
}
// Also according to the old file.ext~timestamp pattern.
pattern = filepath.Join(dir, file+"~"+TimeGlob)
oldVersions, err := v.versionsFs.Glob(pattern)
if err != nil {
l.Warnln("globbing:", err, "for", pattern)
return nil
}
// Use all the found filenames. "~" sorts after "." so all old pattern
// files will be deleted before any new, which is as it should be.
versions := util.UniqueStrings(append(oldVersions, newVersions...))
if len(versions) > v.keep {
for _, toRemove := range versions[:len(versions)-v.keep] {
l.Debugln("cleaning out", toRemove)
err = v.versionsFs.Remove(toRemove)
if err != nil {
l.Warnln("removing old version:", err)
}
}
}
return nil
}
func (v Simple) GetVersions() (map[string][]FileVersion, error) {
return retrieveVersions(v.versionsFs)
}
func (v Simple) Restore(filepath string, versionTime time.Time) error {
return restoreFile(v.versionsFs, v.folderFs, filepath, versionTime, TagFilename)
}