filer.backup: backup to local directory optionally is incremental

fixed one issue with https://github.com/chrislusf/seaweedfs/issues/2084

weed/command/scaffold.go

@@ -377,12 +377,6 @@ directory = "/data"
 # so each date directory contains all new and updated files.
 is_incremental = false
 
-[sink.local_incremental]
-# all replicated files are under modified time as yyyy-mm-dd directories
-# so each date directory contains all new and updated files.
-enabled = false
-directory = "/backup"
-
 [sink.filer]
 enabled = false
 grpcAddress = "localhost:18888"

weed/replication/sink/localsink/local_sink.go

@@ -17,6 +17,7 @@ import (
 type LocalSink struct {
 	Dir           string
 	filerSource   *source.FilerSource
+	isIncremental bool
 }
 
 func init() {
@@ -35,15 +36,17 @@ func (localsink *LocalSink) isMultiPartEntry(key string) bool {
 	return strings.HasSuffix(key, ".part") && strings.Contains(key, "/.uploads/")
 }
 
-func (localsink *LocalSink) initialize(dir string) error {
+func (localsink *LocalSink) initialize(dir string, isIncremental bool) error {
 	localsink.Dir = dir
+	localsink.isIncremental = isIncremental
 	return nil
 }
 
 func (localsink *LocalSink) Initialize(configuration util.Configuration, prefix string) error {
 	dir := configuration.GetString(prefix + "directory")
+	isIncremental := configuration.GetBool(prefix + "is_incremental")
 	glog.V(4).Infof("sink.local.directory: %v", dir)
-	return localsink.initialize(dir)
+	return localsink.initialize(dir, isIncremental)
 }
 
 func (localsink *LocalSink) GetSinkToDirectory() string {
@@ -51,7 +54,7 @@ func (localsink *LocalSink) GetSinkToDirectory() string {
 }
 
 func (localsink *LocalSink) IsIncremental() bool {
-	return true
+	return localsink.isIncremental
 }
 
 func (localsink *LocalSink) DeleteEntry(key string, isDirectory, deleteIncludeChunks bool, signatures []int32) error {

weed/util/config.go

@@ -26,8 +26,6 @@ func LoadConfiguration(configFileName string, required bool) (loaded bool) {
 	viper.AddConfigPath("/usr/local/etc/seaweedfs/") // search path for bsd-style config directory in
 	viper.AddConfigPath("/etc/seaweedfs/")           // path to look for the config file in
 
-	glog.V(1).Infof("Reading %s.toml from %s", configFileName, viper.ConfigFileUsed())
-
 	if err := viper.MergeInConfig(); err != nil { // Handle errors reading the config file
 		if strings.Contains(err.Error(), "Not Found") {
 			glog.V(1).Infof("Reading %s: %v", viper.ConfigFileUsed(), err)
@@ -43,6 +41,7 @@ func LoadConfiguration(configFileName string, required bool) (loaded bool) {
 			return false
 		}
 	}
+	glog.V(1).Infof("Reading %s.toml from %s", configFileName, viper.ConfigFileUsed())
 
 	return true
 }