121 lines
2.6 KiB
Go
121 lines
2.6 KiB
Go
// Copyright (C) 2014 Jakob Borg and Contributors (see the CONTRIBUTORS file).
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// All rights reserved. Use of this source code is governed by an MIT-style
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// license that can be found in the LICENSE file.
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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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"sort"
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"strconv"
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"github.com/syncthing/syncthing/internal/osutil"
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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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// The type holds our configuration
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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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// The constructor function takes a map of parameters and creates the type.
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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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if debug {
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l.Debugf("instantiated %#v", s)
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}
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return s
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}
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// Move away the named file to a version archive. If this function returns
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// 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 := os.Stat(filePath)
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if err != nil {
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if os.IsNotExist(err) {
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if debug {
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l.Debugln("not archiving nonexistent file", filePath)
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}
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return nil
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} else {
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return err
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}
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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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if debug {
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l.Debugln("creating versions dir", versionsDir)
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}
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os.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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if debug {
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l.Debugln("archiving", filePath)
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}
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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 = os.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 := file + "~" + fileInfo.ModTime().Format("20060102-150405")
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dst := filepath.Join(dir, ver)
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if debug {
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l.Debugln("moving to", dst)
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}
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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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versions, err := filepath.Glob(filepath.Join(dir, file+"~[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]-[0-9][0-9][0-9][0-9][0-9][0-9]"))
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if err != nil {
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l.Warnln("globbing:", err)
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return nil
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}
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if len(versions) > v.keep {
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sort.Strings(versions)
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for _, toRemove := range versions[:len(versions)-v.keep] {
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if debug {
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l.Debugln("cleaning out", toRemove)
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}
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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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