mirror of
https://github.com/syncthing/syncthing.git
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123 lines
3.0 KiB
Go
123 lines
3.0 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 versioner
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import (
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"os"
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"path/filepath"
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"strconv"
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"github.com/syncthing/syncthing/lib/osutil"
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"github.com/syncthing/syncthing/lib/util"
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)
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func init() {
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// Register the constructor for this type of versioner with the name "simple"
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Factories["simple"] = NewSimple
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}
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type Simple struct {
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keep int
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folderPath string
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}
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func NewSimple(folderID, folderPath string, params map[string]string) Versioner {
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keep, err := strconv.Atoi(params["keep"])
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if err != nil {
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keep = 5 // A reasonable default
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}
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s := Simple{
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keep: keep,
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folderPath: folderPath,
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}
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l.Debugf("instantiated %#v", s)
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return s
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}
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// Archive moves the named file away to a version archive. If this function
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// returns nil, the named file does not exist any more (has been archived).
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func (v Simple) Archive(filePath string) error {
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fileInfo, err := osutil.Lstat(filePath)
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if os.IsNotExist(err) {
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l.Debugln("not archiving nonexistent file", filePath)
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return nil
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} else if err != nil {
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return err
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}
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if fileInfo.Mode()&os.ModeSymlink != 0 {
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panic("bug: attempting to version a symlink")
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}
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versionsDir := filepath.Join(v.folderPath, ".stversions")
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_, err = os.Stat(versionsDir)
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if err != nil {
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if os.IsNotExist(err) {
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l.Debugln("creating versions dir", versionsDir)
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osutil.MkdirAll(versionsDir, 0755)
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osutil.HideFile(versionsDir)
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} else {
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return err
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}
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}
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l.Debugln("archiving", filePath)
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file := filepath.Base(filePath)
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inFolderPath, err := filepath.Rel(v.folderPath, filepath.Dir(filePath))
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if err != nil {
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return err
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}
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dir := filepath.Join(versionsDir, inFolderPath)
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err = osutil.MkdirAll(dir, 0755)
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if err != nil && !os.IsExist(err) {
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return err
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}
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ver := taggedFilename(file, fileInfo.ModTime().Format(TimeFormat))
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dst := filepath.Join(dir, ver)
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l.Debugln("moving to", dst)
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err = osutil.Rename(filePath, dst)
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if err != nil {
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return err
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}
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// Glob according to the new file~timestamp.ext pattern.
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pattern := filepath.Join(dir, taggedFilename(file, TimeGlob))
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newVersions, err := osutil.Glob(pattern)
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if err != nil {
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l.Warnln("globbing:", err, "for", pattern)
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return nil
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}
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// Also according to the old file.ext~timestamp pattern.
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pattern = filepath.Join(dir, file+"~"+TimeGlob)
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oldVersions, err := osutil.Glob(pattern)
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if err != nil {
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l.Warnln("globbing:", err, "for", pattern)
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return nil
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}
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// Use all the found filenames. "~" sorts after "." so all old pattern
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// files will be deleted before any new, which is as it should be.
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versions := util.UniqueStrings(append(oldVersions, newVersions...))
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if len(versions) > v.keep {
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for _, toRemove := range versions[:len(versions)-v.keep] {
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l.Debugln("cleaning out", toRemove)
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err = os.Remove(toRemove)
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if err != nil {
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l.Warnln("removing old version:", err)
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}
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}
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}
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return nil
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}
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