package main import ( "archive/tar" "bytes" "fmt" "os" "path" "strconv" "strings" "text/template" "time" "github.com/chrislusf/seaweedfs/go/glog" "github.com/chrislusf/seaweedfs/go/storage" ) const ( defaultFnFormat = `{{.Mime}}/{{.Id}}:{{.Name}}` timeFormat = "2006-01-02T15:04:05" ) var ( export ExportOptions ) type ExportOptions struct { dir *string collection *string volumeId *int } var cmdExport = &Command{ UsageLine: "export -dir=/tmp -volumeId=234 -o=/dir/name.tar -fileNameFormat={{.Name}} -newer='" + timeFormat + "'", Short: "list or export files from one volume data file", Long: `List all files in a volume, or Export all files in a volume to a tar file if the output is specified. The format of file name in the tar file can be customized. Default is {{.Mime}}/{{.Id}}:{{.Name}}. Also available is {{.Key}}. `, } func init() { cmdExport.Run = runExport // break init cycle export.dir = cmdExport.Flag.String("dir", ".", "input data directory to store volume data files") export.collection = cmdExport.Flag.String("collection", "", "the volume collection name") export.volumeId = cmdExport.Flag.Int("volumeId", -1, "a volume id. The volume .dat and .idx files should already exist in the dir.") } var ( output = cmdExport.Flag.String("o", "", "output tar file name, must ends with .tar, or just a \"-\" for stdout") format = cmdExport.Flag.String("fileNameFormat", defaultFnFormat, "filename format, default to {{.Mime}}/{{.Id}}:{{.Name}}") newer = cmdExport.Flag.String("newer", "", "export only files newer than this time, default is all files. Must be specified in RFC3339 without timezone") tarOutputFile *tar.Writer tarHeader tar.Header fileNameTemplate *template.Template fileNameTemplateBuffer = bytes.NewBuffer(nil) newerThan time.Time newerThanUnix int64 = -1 localLocation, _ = time.LoadLocation("Local") ) func runExport(cmd *Command, args []string) bool { var err error if *newer != "" { if newerThan, err = time.ParseInLocation(timeFormat, *newer, localLocation); err != nil { fmt.Println("cannot parse 'newer' argument: " + err.Error()) return false } newerThanUnix = newerThan.Unix() } if *export.volumeId == -1 { return false } if *output != "" { if *output != "-" && !strings.HasSuffix(*output, ".tar") { fmt.Println("the output file", *output, "should be '-' or end with .tar") return false } if fileNameTemplate, err = template.New("name").Parse(*format); err != nil { fmt.Println("cannot parse format " + *format + ": " + err.Error()) return false } var outputFile *os.File if *output == "-" { outputFile = os.Stdout } else { if outputFile, err = os.Create(*output); err != nil { glog.Fatalf("cannot open output tar %s: %s", *output, err) } } defer outputFile.Close() tarOutputFile = tar.NewWriter(outputFile) defer tarOutputFile.Close() t := time.Now() tarHeader = tar.Header{Mode: 0644, ModTime: t, Uid: os.Getuid(), Gid: os.Getgid(), Typeflag: tar.TypeReg, AccessTime: t, ChangeTime: t} } fileName := strconv.Itoa(*export.volumeId) if *export.collection != "" { fileName = *export.collection + "_" + fileName } vid := storage.VolumeId(*export.volumeId) indexFile, err := os.OpenFile(path.Join(*export.dir, fileName+".idx"), os.O_RDONLY, 0644) if err != nil { glog.Fatalf("Create Volume Index [ERROR] %s\n", err) } defer indexFile.Close() needleMap, err := storage.LoadNeedleMap(indexFile) if err != nil { glog.Fatalf("cannot load needle map from %s: %s", indexFile.Name(), err) } var version storage.Version err = storage.ScanVolumeFile(*export.dir, *export.collection, vid, storage.NeedleMapInMemory, func(superBlock storage.SuperBlock) error { version = superBlock.Version() return nil }, true, func(n *storage.Needle, offset int64) error { nv, ok := needleMap.Get(n.Id) glog.V(3).Infof("key %d offset %d size %d disk_size %d gzip %v ok %v nv %+v", n.Id, offset, n.Size, n.DiskSize(), n.IsGzipped(), ok, nv) if ok && nv.Size > 0 && int64(nv.Offset)*8 == offset { if newerThanUnix >= 0 && n.HasLastModifiedDate() && n.LastModified < uint64(newerThanUnix) { glog.V(3).Infof("Skipping this file, as it's old enough: LastModified %d vs %d", n.LastModified, newerThanUnix) return nil } return walker(vid, n, version) } if !ok { glog.V(2).Infof("This seems deleted %d size %d", n.Id, n.Size) } else { glog.V(2).Infof("Skipping later-updated Id %d size %d", n.Id, n.Size) } return nil }) if err != nil { glog.Fatalf("Export Volume File [ERROR] %s\n", err) } return true } type nameParams struct { Name string Id uint64 Mime string Key string } func walker(vid storage.VolumeId, n *storage.Needle, version storage.Version) (err error) { key := storage.NewFileIdFromNeedle(vid, n).String() if tarOutputFile != nil { fileNameTemplateBuffer.Reset() if err = fileNameTemplate.Execute(fileNameTemplateBuffer, nameParams{Name: string(n.Name), Id: n.Id, Mime: string(n.Mime), Key: key, }, ); err != nil { return err } fileName := fileNameTemplateBuffer.String() if n.IsGzipped() && path.Ext(fileName) != ".gz" { fileName = fileName + ".gz" } tarHeader.Name, tarHeader.Size = fileName, int64(len(n.Data)) if n.HasLastModifiedDate() { tarHeader.ModTime = time.Unix(int64(n.LastModified), 0) } else { tarHeader.ModTime = time.Unix(0, 0) } tarHeader.ChangeTime = tarHeader.ModTime if err = tarOutputFile.WriteHeader(&tarHeader); err != nil { return err } _, err = tarOutputFile.Write(n.Data) } else { size := n.DataSize if version == storage.Version1 { size = n.Size } fmt.Printf("key=%s Name=%s Size=%d gzip=%t mime=%s\n", key, n.Name, size, n.IsGzipped(), n.Mime, ) } return }