syncthing/lib/versioner/versioner.go

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// 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
// 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/.
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// Package versioner implements common interfaces for file versioning and a
// simple default versioning scheme.
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package versioner
import (
"context"
"errors"
"fmt"
"time"
"github.com/syncthing/syncthing/lib/config"
)
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type Versioner interface {
Archive(filePath string) error
GetVersions() (map[string][]FileVersion, error)
Restore(filePath string, versionTime time.Time) error
Clean(context.Context) error
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}
type FileVersion struct {
VersionTime time.Time `json:"versionTime"`
ModTime time.Time `json:"modTime"`
Size int64 `json:"size"`
}
type factory func(cfg config.FolderConfiguration) Versioner
var factories = make(map[string]factory)
var ErrRestorationNotSupported = errors.New("version restoration not supported with the current versioner")
const (
TimeFormat = "20060102-150405"
timeGlob = "[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]" // glob pattern matching TimeFormat
)
func New(cfg config.FolderConfiguration) (Versioner, error) {
fac, ok := factories[cfg.Versioning.Type]
if !ok {
return nil, fmt.Errorf("requested versioning type %q does not exist", cfg.Type)
}
return fac(cfg), nil
}