filer: add -defaultStoreDir so that filer.toml can be skipped

fix https://github.com/chrislusf/seaweedfs/issues/1659

weed/command/filer.go

@@ -43,8 +43,6 @@ type FilerOptions struct {
 	peers                   *string
 	metricsHttpPort         *int
 	cacheToFilerLimit       *int
-
-	// default leveldb directory, used in "weed server" mode
 	defaultLevelDbDirectory *string
 }
 
@@ -67,6 +65,7 @@ func init() {
 	f.peers = cmdFiler.Flag.String("peers", "", "all filers sharing the same filer store in comma separated ip:port list")
 	f.metricsHttpPort = cmdFiler.Flag.Int("metricsPort", 0, "Prometheus metrics listen port")
 	f.cacheToFilerLimit = cmdFiler.Flag.Int("cacheToFilerLimit", 0, "Small files smaller than this limit can be cached in filer store.")
+	f.defaultLevelDbDirectory = cmdFiler.Flag.String("defaultStoreDir", ".", "if filer.toml is empty, use an embedded filer store in the directory")
 
 	// start s3 on filer
 	filerStartS3 = cmdFiler.Flag.Bool("s3", false, "whether to start S3 gateway")
@@ -92,6 +91,7 @@ var cmdFiler = &Command{
 	GET /path/to/
 
 	The configuration file "filer.toml" is read from ".", "$HOME/.seaweedfs/", "/usr/local/etc/seaweedfs/", or "/etc/seaweedfs/", in that order.
+	If the "filer.toml" is not found, an embedded filer store will be craeted under "-defaultStoreDir".
 
 	The example filer.toml configuration file can be generated by "weed scaffold -config=filer"
 
@@ -127,10 +127,7 @@ func (fo *FilerOptions) startFiler() {
 		publicVolumeMux = http.NewServeMux()
 	}
 
-	defaultLevelDbDirectory := "./filerldb2"
-	if fo.defaultLevelDbDirectory != nil {
-		defaultLevelDbDirectory = util.ResolvePath(*fo.defaultLevelDbDirectory + "/filerldb2")
-	}
+	defaultLevelDbDirectory := util.ResolvePath(*fo.defaultLevelDbDirectory + "/filerldb2")
 
 	var peers []string
 	if *fo.peers != "" {

weed/server/filer_server.go

@@ -109,6 +109,8 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 			os.MkdirAll(option.DefaultLevelDbDir, 0755)
 		}
 		glog.V(0).Infof("default to create filer store dir in %s", option.DefaultLevelDbDir)
+	} else {
+		glog.Warningf("skipping default store dir in %s", option.DefaultLevelDbDir)
 	}
 	util.LoadConfiguration("notification", false)