155 lines
3.1 KiB
Go
155 lines
3.1 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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"errors"
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"fmt"
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"io/ioutil"
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"os"
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"path"
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"path/filepath"
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"sort"
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"time"
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"bazil.org/fuse/fs"
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)
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//
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// database
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//
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type database struct {
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base string
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vers verList
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}
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func newDatabase(path string) (*database, error) {
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base, err := filepath.Abs(path)
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if err != nil {
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return nil, err
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}
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return &database{base, nil}, nil
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}
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func (db *database) load(index uint) error {
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var err error
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db.vers, err = db.loadVers(db.base)
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if err != nil {
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return err
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}
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if index > uint(len(db.vers)) {
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return errors.New("invalid version index")
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}
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if index > 0 {
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db.vers = db.vers[:index]
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}
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if lastVer := db.lastVer(); lastVer != nil {
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return lastVer.resolve()
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}
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return nil
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}
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func (db *database) save() error {
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lastVer := db.lastVer()
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for _, ver := range db.vers {
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if err := ver.finalize(ver == lastVer); err != nil {
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return err
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}
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}
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return nil
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}
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func (db *database) loadVers(base string) (verList, error) {
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nodes, err := ioutil.ReadDir(base)
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if err != nil {
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return nil, err
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}
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var vers verList
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for _, node := range nodes {
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if !node.IsDir() {
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continue
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}
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timestamp, err := parseVerName(node.Name())
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if err != nil {
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return nil, err
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}
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ver, err := newVer(path.Join(base, node.Name()), timestamp, db)
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if err != nil {
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return nil, err
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}
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vers = append(vers, ver)
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}
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sort.Sort(vers)
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var pv *version
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for _, ver := range vers {
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ver.parent = pv
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pv = ver
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}
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return vers, nil
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}
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func (db *database) lastVer() *version {
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count := len(db.vers)
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if count == 0 {
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return nil
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}
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return db.vers[count-1]
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}
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func (db *database) createNewVer() error {
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name := buildVerName(time.Now())
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if err := os.MkdirAll(path.Join(db.base, name, "root"), 0755); 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 (db *database) dump() {
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for index, ver := range db.vers {
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fmt.Printf("version: %d\ttime: %s\n", index+1, ver.timestamp.String())
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}
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}
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// FS
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func (db *database) Root() (fs.Node, error) {
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return db.lastVer().root, nil
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}
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