mirror of
https://github.com/seaweedfs/seaweedfs.git
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4c58cef24a
compatibility.
171 lines
4.5 KiB
Go
171 lines
4.5 KiB
Go
package main
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import (
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"archive/tar"
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"bytes"
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"code.google.com/p/weed-fs/go/glog"
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"code.google.com/p/weed-fs/go/storage"
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"fmt"
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"os"
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"path"
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"strconv"
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"strings"
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"text/template"
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"time"
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)
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func init() {
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cmdExport.Run = runExport // break init cycle
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cmdExport.IsDebug = cmdExport.Flag.Bool("debug", false, "enable debug mode")
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}
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const (
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defaultFnFormat = `{{.Mime}}/{{.Id}}:{{.Name}}`
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)
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var cmdExport = &Command{
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UsageLine: "export -dir=/tmp -volumeId=234 -o=/dir/name.tar -fileNameFormat={{.Name}}",
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Short: "list or export files from one volume data file",
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Long: `List all files in a volume, or Export all files in a volume to a tar file if the output is specified.
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The format of file name in the tar file can be customized. Default is {{.Mime}}/{{.Id}}:{{.Name}}. Also available is {{.Key}}.
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`,
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}
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var (
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exportVolumePath = cmdExport.Flag.String("dir", "/tmp", "input data directory to store volume data files")
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exportCollection = cmdExport.Flag.String("collection", "", "the volume collection name")
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exportVolumeId = cmdExport.Flag.Int("volumeId", -1, "a volume id. The volume should already exist in the dir. The volume index file should not exist.")
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dest = cmdExport.Flag.String("o", "", "output tar file name, must ends with .tar, or just a \"-\" for stdout")
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format = cmdExport.Flag.String("fileNameFormat", defaultFnFormat, "filename format, default to {{.Mime}}/{{.Id}}:{{.Name}}")
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tarFh *tar.Writer
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tarHeader tar.Header
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fnTmpl *template.Template
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fnTmplBuf = bytes.NewBuffer(nil)
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)
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func runExport(cmd *Command, args []string) bool {
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if *exportVolumeId == -1 {
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return false
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}
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var err error
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if *dest != "" {
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if *dest != "-" && !strings.HasSuffix(*dest, ".tar") {
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fmt.Println("the output file", *dest, "should be '-' or end with .tar")
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return false
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}
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if fnTmpl, err = template.New("name").Parse(*format); err != nil {
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fmt.Println("cannot parse format " + *format + ": " + err.Error())
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return false
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}
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var fh *os.File
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if *dest == "-" {
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fh = os.Stdout
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} else {
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if fh, err = os.Create(*dest); err != nil {
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glog.Fatalf("cannot open output tar %s: %s", *dest, err)
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}
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}
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defer fh.Close()
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tarFh = tar.NewWriter(fh)
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defer tarFh.Close()
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t := time.Now()
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tarHeader = tar.Header{Mode: 0644,
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ModTime: t, Uid: os.Getuid(), Gid: os.Getgid(),
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Typeflag: tar.TypeReg,
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AccessTime: t, ChangeTime: t}
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}
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fileName := strconv.Itoa(*exportVolumeId)
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if *exportCollection != "" {
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fileName = *exportCollection + "_" + fileName
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}
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vid := storage.VolumeId(*exportVolumeId)
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indexFile, err := os.OpenFile(path.Join(*exportVolumePath, fileName+".idx"), os.O_RDONLY, 0644)
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if err != nil {
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glog.Fatalf("Create Volume Index [ERROR] %s\n", err)
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}
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defer indexFile.Close()
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nm, err := storage.LoadNeedleMap(indexFile)
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if err != nil {
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glog.Fatalf("cannot load needle map from %s: %s", indexFile.Name(), err)
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}
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var version storage.Version
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err = storage.ScanVolumeFile(*exportVolumePath, *exportCollection, vid, func(superBlock storage.SuperBlock) error {
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version = superBlock.Version()
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return nil
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}, true, func(n *storage.Needle, offset int64) error {
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nv, ok := nm.Get(n.Id)
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glog.V(3).Infoln("key", n.Id, "offset", offset, "size", n.Size, "disk_size", n.DiskSize(), "gzip", n.IsGzipped(), "ok", ok, "nv", nv)
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if ok && nv.Size > 0 {
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return walker(vid, n, version)
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} else {
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if !ok {
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debug("This seems deleted", n.Id, "size", n.Size)
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} else {
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debug("Id", n.Id, "size", n.Size)
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}
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}
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return nil
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})
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if err != nil {
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glog.Fatalf("Export Volume File [ERROR] %s\n", err)
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}
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return true
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}
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type nameParams struct {
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Name string
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Id uint64
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Mime string
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Key string
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}
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func walker(vid storage.VolumeId, n *storage.Needle, version storage.Version) (err error) {
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key := storage.NewFileIdFromNeedle(vid, n).String()
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if tarFh != nil {
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fnTmplBuf.Reset()
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if err = fnTmpl.Execute(fnTmplBuf,
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nameParams{Name: string(n.Name),
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Id: n.Id,
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Mime: string(n.Mime),
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Key: key,
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},
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); err != nil {
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return err
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}
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nm := fnTmplBuf.String()
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if n.IsGzipped() && path.Ext(nm) != ".gz" {
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nm = nm + ".gz"
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}
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tarHeader.Name, tarHeader.Size = nm, int64(len(n.Data))
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if err = tarFh.WriteHeader(&tarHeader); err != nil {
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return err
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}
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_, err = tarFh.Write(n.Data)
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} else {
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size := n.DataSize
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if version == storage.Version1 {
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size = n.Size
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}
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fmt.Printf("key=%s Name=%s Size=%d gzip=%t mime=%s\n",
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key,
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n.Name,
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size,
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n.IsGzipped(),
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n.Mime,
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)
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}
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return
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}
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