vfs/meta.go

85 lines
2.1 KiB
Go
Raw Normal View History

/*
* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
* Author: Alex Yatskov <alex@foosoft.net>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package main
import (
"encoding/json"
"io/ioutil"
"os"
2015-05-16 07:07:45 +00:00
"strings"
)
2015-05-28 09:20:38 +00:00
//
// versionMetadata
//
type versionMetadata struct {
Deleted []string `json:"deleted"`
path string
}
func newVersionMetadata(path string) (*versionMetadata, error) {
meta := &versionMetadata{path: path}
if err := meta.load(); err != nil {
return nil, err
}
return meta, nil
}
2015-05-16 07:43:46 +00:00
func (this *versionMetadata) filter(nodes versionedNodeMap) {
for _, delPath := range this.Deleted {
2015-05-16 07:07:45 +00:00
for name, node := range nodes {
if strings.HasPrefix(node.path, delPath) {
delete(nodes, name)
}
}
}
}
func (this *versionMetadata) load() error {
if _, err := os.Stat(this.path); os.IsNotExist(err) {
return nil
}
bytes, err := ioutil.ReadFile(this.path)
if err != nil {
return err
}
if err := json.Unmarshal(bytes, &this); err != nil {
return err
}
return nil
}
func (this *versionMetadata) save() error {
js, err := json.Marshal(this)
if err != nil {
return err
}
return ioutil.WriteFile(this.path, js, 0644)
}