directory structure change to work with glide

glide has its own requirements. My previous workaround caused me some
code checkin errors. Need to fix this.

weed/command/fix.go

@@ -0,0 +1,70 @@
+package command
+
+import (
+	"os"
+	"path"
+	"strconv"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/storage"
+)
+
+func init() {
+	cmdFix.Run = runFix // break init cycle
+}
+
+var cmdFix = &Command{
+	UsageLine: "fix -dir=/tmp -volumeId=234",
+	Short:     "run weed tool fix on index file if corrupted",
+	Long: `Fix runs the SeaweedFS fix command to re-create the index .idx file.
+
+  `,
+}
+
+var (
+	fixVolumePath       = cmdFix.Flag.String("dir", ".", "data directory to store files")
+	fixVolumeCollection = cmdFix.Flag.String("collection", "", "the volume collection name")
+	fixVolumeId         = cmdFix.Flag.Int("volumeId", -1, "a volume id. The volume should already exist in the dir. The volume index file should not exist.")
+)
+
+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,
+		storage.NeedleMapInMemory,
+		func(superBlock storage.SuperBlock) error {
+			return nil
+		}, false, func(n *storage.Needle, offset int64) error {
+			glog.V(2).Infof("key %d offset %d size %d disk_size %d gzip %v", n.Id, offset, n.Size, n.DiskSize(), n.IsGzipped())
+			if n.Size > 0 {
+				pe := nm.Put(n.Id, uint32(offset/storage.NeedlePaddingSize), n.Size)
+				glog.V(2).Infof("saved %d with error %v", n.Size, pe)
+			} else {
+				glog.V(2).Infof("skipping deleted file ...")
+				return nm.Delete(n.Id)
+			}
+			return nil
+		})
+	if err != nil {
+		glog.Fatalf("Export Volume File [ERROR] %s\n", err)
+	}
+
+	return true
+}