109 lines
2.6 KiB
Go
109 lines
2.6 KiB
Go
/*
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* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
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* Author: Alex Yatskov <alex@foosoft.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package main
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import (
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"encoding/json"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"regexp"
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"strconv"
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"time"
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)
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type metadata struct {
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Deleted []string
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}
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type version struct {
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base string
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parent *version
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timestamp time.Time
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meta metadata
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}
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func newVersion(base string, parent *version) (*version, error) {
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re, err := regexp.Compile(`/vfs_([0-9a-f])$`)
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if err != nil {
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return nil, err
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}
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matches := re.FindStringSubmatch(base)
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if len(matches) < 2 {
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return nil, fmt.Errorf("invalid version identifier for %s", base)
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}
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timeval, err := strconv.ParseInt(matches[1], 16, 64)
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if err != nil {
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return nil, err
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}
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ver := &version{
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base: base,
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parent: parent,
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timestamp: time.Unix(timeval, 0)}
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if err := ver.loadMetadata(); err != nil {
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return nil, err
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}
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return ver, nil
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}
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func (this *version) loadMetadata() error {
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path := this.metadataPath()
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if _, err := os.Stat(path); os.IsNotExist(err) {
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return nil
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}
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bytes, err := ioutil.ReadFile(this.metadataPath())
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if err != nil {
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return err
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}
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if err := json.Unmarshal(bytes, &this.meta); err != nil {
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return err
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}
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return nil
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}
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func (this *version) saveMetadata() error {
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js, err := json.Marshal(this.meta)
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if err != nil {
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return err
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}
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return ioutil.WriteFile(this.metadataPath(), js, 0644)
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}
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func (this *version) metadataPath() string {
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return filepath.Join(this.base, "meta.json")
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}
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func (this *version) rootPath() string {
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return filepath.Join(this.base, "root")
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}
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