125 lines
2.8 KiB
Go
125 lines
2.8 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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"bazil.org/fuse/fs"
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"io/ioutil"
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"path/filepath"
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"sync/atomic"
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)
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type database struct {
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base string
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vers []*version
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inodeCnt uint64
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}
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func newDatabase(dir string) (*database, error) {
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db := &database{base: dir}
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if err := db.load(dir); err != nil {
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return nil, err
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}
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return db, nil
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}
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func (this *database) load(dir string) error {
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var err error
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this.base, err = filepath.Abs(dir)
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if err != nil {
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return err
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}
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dirs, err := this.scan(this.base)
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if err != nil {
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return err
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}
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this.vers, err = this.versions(dirs)
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if err != nil {
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return err
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}
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if lastVer := this.lastVersion(); 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 (this *database) save() error {
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return nil
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}
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func (this *database) versions(dirs []string) ([]*version, error) {
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var vers []*version
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var parent *version
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for _, dir := range dirs {
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ver, err := newVersion(dir, this, parent)
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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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parent = ver
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}
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return vers, nil
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}
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func (this *database) lastVersion() *version {
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count := len(this.vers)
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if count == 0 {
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return nil
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}
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return this.vers[count-1]
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}
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func (this *database) scan(dir string) ([]string, error) {
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nodes, err := ioutil.ReadDir(dir)
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if err != nil {
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return nil, err
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}
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var dirs []string
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for _, node := range nodes {
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if node.IsDir() {
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dirs = append(dirs, filepath.Join(dir, node.Name()))
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}
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}
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return dirs, nil
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}
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func (this *database) Root() (fs.Node, error) {
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return this.lastVersion().root, nil
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}
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func (this *database) AllocInode() uint64 {
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return atomic.AddUint64(&this.inodeCnt, 1)
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}
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