func runFix(cmd *Command, args []string) bool {
if *fixVolumeId == -1 {
return false
}
fileName := strconv.Itoa(*fixVolumeId)
if *fixVolumeCollection != "" {
fileName = *fixVolumeCollection + "_" + fileName
}
indexFile, err := os.OpenFile(path.Join(*fixVolumePath, fileName+".idx"), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
glog.Fatalf("Create Volume Index [ERROR] %s\n", err)
}
defer indexFile.Close()
nm := storage.NewNeedleMap(indexFile)
defer nm.Close()
vid := storage.VolumeId(*fixVolumeId)
err = storage.ScanVolumeFile(*fixVolumePath, *fixVolumeCollection, vid, func(superBlock storage.SuperBlock) error {
return nil
}, false, func(n *storage.Needle, offset int64) error {
debug("key", n.Id, "offset", offset, "size", n.Size, "disk_size", n.DiskSize(), "gzip", n.IsGzipped())
if n.Size > 0 {
count, pe := nm.Put(n.Id, uint32(offset/storage.NeedlePaddingSize), n.Size)
debug("saved", count, "with error", pe)
} else {
debug("skipping deleted file ...")
return nm.Delete(n.Id)
}
return nil
})
if err != nil {
glog.Fatalf("Export Volume File [ERROR] %s\n", err)
}
return true
}
//如果 dest == - 则表示标准输出
func runExport(cmd *Command, args []string) bool {
if *exportVolumeId == -1 {
return false
}
var err error
if *dest != "" {
if *dest != "-" && !strings.HasSuffix(*dest, ".tar") {
fmt.Println("the output file", *dest, "should be '-' or end with .tar")
return false
}
if fnTmpl, err = template.New("name").Parse(*format); err != nil {
fmt.Println("cannot parse format " + *format + ": " + err.Error())
return false
}
var fh *os.File
if *dest == "-" { //标准输出
fh = os.Stdout
} else {
if fh, err = os.Create(*dest); err != nil {
glog.Fatalf("cannot open output tar %s: %s", *dest, err)
}
}
defer fh.Close()
tarFh = tar.NewWriter(fh)
defer tarFh.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(*exportVolumeId)
if *exportCollection != "" {
fileName = *exportCollection + "_" + fileName
}
vid := storage.VolumeId(*exportVolumeId)
indexFile, err := os.OpenFile(path.Join(*exportVolumePath, fileName+".idx"), os.O_RDONLY, 0644)
if err != nil {
glog.Fatalf("Create Volume Index [ERROR] %s\n", err)
}
defer indexFile.Close()
//从index文件中加载整个volume的needle信息
nm, 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(*exportVolumePath, *exportCollection, vid, func(superBlock storage.SuperBlock) error {
version = superBlock.Version()
return nil
}, true, func(n *storage.Needle, offset int64) error {
nv, ok := nm.Get(n.Id)
glog.V(3).Infoln("key", n.Id, "offset", offset, "size", n.Size, "disk_size", n.DiskSize(), "gzip", n.IsGzipped(), "ok", ok, "nv", nv)
if ok && nv.Size > 0 {
return walker(vid, n, version)
} else {
if !ok {
debug("This seems deleted", n.Id, "size", n.Size)
} else {
debug("Id", n.Id, "size", n.Size)
}
}
return nil
})
if err != nil {
glog.Fatalf("Export Volume File [ERROR] %s\n", err)
}
return true
}