syncthing/lib/versioner/simple.go
Jakob Borg aedc2d788f
lib/model, lib/versioner: Drive version cleanup from scanner (fixes #6313) (#6693)
This change adds a separate config for the cleanup interval, and runs that cleanup from the main folder loop.
2020-07-14 10:48:50 +02:00

81 lines
2.1 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 (
"context"
"strconv"
"time"
"github.com/syncthing/syncthing/lib/config"
"github.com/syncthing/syncthing/lib/fs"
)
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
copyRangeMethod fs.CopyRangeMethod
}
func newSimple(cfg config.FolderConfiguration) Versioner {
var keep, err = strconv.Atoi(cfg.Versioning.Params["keep"])
if err != nil {
keep = 5 // A reasonable default
}
s := simple{
keep: keep,
folderFs: cfg.Filesystem(),
versionsFs: versionerFsFromFolderCfg(cfg),
copyRangeMethod: cfg.CopyRangeMethod,
}
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// returns nil, the named file does not exist any more (has been archived).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.copyRangeMethod, v.folderFs, v.versionsFs, filePath, TagFilename)
if err != nil {
return err
}
// Versions are sorted by timestamp in the file name, oldest first.
versions := findAllVersions(v.versionsFs, filePath)
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.copyRangeMethod, v.versionsFs, v.folderFs, filepath, versionTime, TagFilename)
}
func (v simple) Clean(_ context.Context) error {
return nil
}