replicate: use creation time for local incremental file sink

related to https://github.com/chrislusf/seaweedfs/pull/1762

weed/command/filer_replication.go

@@ -11,7 +11,6 @@ import (
 	_ "github.com/chrislusf/seaweedfs/weed/replication/sink/b2sink"
 	_ "github.com/chrislusf/seaweedfs/weed/replication/sink/filersink"
 	_ "github.com/chrislusf/seaweedfs/weed/replication/sink/gcssink"
-	_ "github.com/chrislusf/seaweedfs/weed/replication/sink/localincrementalsink"
 	_ "github.com/chrislusf/seaweedfs/weed/replication/sink/localsink"
 	_ "github.com/chrislusf/seaweedfs/weed/replication/sink/s3sink"
 	"github.com/chrislusf/seaweedfs/weed/replication/sub"

weed/command/scaffold.go

@@ -354,11 +354,10 @@ directory = "/buckets"
 [sink.local]
 enabled = false
 directory = "/data"
-todays_date_format = ""  # set this to 2006-02-01 for incremental backup
 
 [sink.local_incremental]
+# all replicated files are under creation time as yyyy-mm-dd directories
 enabled = false
-# all replicated files are under modification time date directory tree
 directory = "/backup"
 
 [sink.filer]

weed/replication/replicator.go

@@ -43,13 +43,13 @@ func (r *Replicator) Replicate(ctx context.Context, key string, message *filer_p
 	}
 	var dateKey string
 	if r.sink.GetName() == "local_incremental" {
-		var mTime int64
+		var cTime int64
 		if message.NewEntry != nil {
-			mTime = message.NewEntry.Attributes.Mtime
+			cTime = message.NewEntry.Attributes.Crtime
 		} else if message.OldEntry != nil {
-			mTime = message.OldEntry.Attributes.Mtime
+			cTime = message.OldEntry.Attributes.Crtime
 		}
-		dateKey = time.Unix(mTime, 0).Format("2006-01-02")
+		dateKey = time.Unix(cTime, 0).Format("2006-01-02")
 	}
 	newKey := util.Join(r.sink.GetSinkToDirectory(), dateKey, key[len(r.source.Dir):])
 	glog.V(3).Infof("replicate %s => %s", key, newKey)

weed/replication/sink/localincrementalsink/local_incremental_sink.go → weed/replication/sink/localsink/local_incremental_sink.go

@@ -1,12 +1,11 @@
-package localincrementalsink
+package localsink
 
 import (
 	"github.com/chrislusf/seaweedfs/weed/replication/sink"
-	"github.com/chrislusf/seaweedfs/weed/replication/sink/localsink"
 )
 
 type LocalIncSink struct {
-	localsink.LocalSink
+	LocalSink
 }
 
 func (localincsink *LocalIncSink) GetName() string {