224 lines
5.2 KiB
Go
224 lines
5.2 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"
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// "bazil.org/fuse/fs"
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// "golang.org/x/net/context"
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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 versionMetadata struct {
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Deleted []string
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}
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type versionedFile struct {
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info os.FileInfo
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}
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type versionedDir struct {
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dirs map[string]versionedDir
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files map[string]versionedFile
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info os.FileInfo
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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 versionMetadata
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root versionedDir
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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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if err := ver.scanFs(); 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) scanDir(path string) (map[string]os.FileInfo, error) {
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ownNodes := make(map[string]os.FileInfo)
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{
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fullPath := filepath.Join(this.rootPath(), path)
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nodes, err := ioutil.ReadDir(fullPath)
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if err != nil {
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return nil, err
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}
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for _, node := range nodes {
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ownNodes[node.Name()] = node
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}
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}
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if this.parent == nil {
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return ownNodes, nil
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}
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baseNodes, err := this.parent.scanDir(path)
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if err != nil {
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return nil, err
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}
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for ownName, ownInfo := range ownNodes {
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baseNodes[ownName] = ownInfo
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}
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return baseNodes, nil
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}
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func (this *version) buildDir(path string, dir *versionedDir) error {
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nodes, err := this.scanDir(path)
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if err != nil {
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return err
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}
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for name, info := range nodes {
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if info.IsDir() {
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subDir := versionedDir{info: info}
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subDirPath := filepath.Join(path, name)
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if err := this.buildDir(subDirPath, &subDir); err != nil {
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return err
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}
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dir.dirs[name] = subDir
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} else {
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dir.files[name] = versionedFile{info: info}
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}
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}
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return nil
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}
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func (this *version) scanFs() error {
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rootNode, err := os.Stat(this.rootPath())
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if err != nil {
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return err
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}
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this.root = versionedDir{info: rootNode}
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return this.buildDir(this.rootPath(), &this.root)
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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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// func (this *version) Attr(a *fuse.Attr) {
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// // type Attr struct {
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// // Inode uint64 // inode number
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// // Size uint64 // size in bytes
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// // Blocks uint64 // size in blocks
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// // Atime time.Time // time of last access
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// // Mtime time.Time // time of last modification
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// // Ctime time.Time // time of last inode change
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// // Crtime time.Time // time of creation (OS X only)
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// // Mode os.FileMode // file mode
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// // Nlink uint32 // number of links
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// // Uid uint32 // owner uid
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// // Gid uint32 // group gid
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// // Rdev uint32 // device numbers
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// // Flags uint32 // chflags(2) flags (OS X only)
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// a.Inode = 1
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// a.Mode = os.ModeDir | 0755
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// }
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// func (this *version) Lookup(ctx context.Context, name string) (fs.Node, error) {
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// // if name == "hello" {
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// // return File{}, nil
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// // }
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// return nil, fuse.ENOENT
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// }
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// func (this *version) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
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// var dirDirs = []fuse.Dirent{
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// {Inode: 2, Name: "hello", Type: fuse.DT_File},
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// }
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// return dirDirs, nil
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// }
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