storagenode: allow configuring database path independently

Fixes #3852

Change-Id: I021c29c4dd7c393399f6abef41d8457514032833

storagenode/peer.go

@@ -125,10 +125,14 @@ type Config struct {
 
 // DatabaseConfig returns the storagenodedb.Config that should be used with this Config.
 func (config *Config) DatabaseConfig() storagenodedb.Config {
+	dbdir := config.Storage2.DatabaseDir
+	if dbdir == "" {
+		dbdir = config.Storage.Path
+	}
 	return storagenodedb.Config{
 		Storage:   config.Storage.Path,
-		Info:      filepath.Join(config.Storage.Path, "piecestore.db"),
-		Info2:     filepath.Join(config.Storage.Path, "info.db"),
+		Info:      filepath.Join(dbdir, "piecestore.db"),
+		Info2:     filepath.Join(dbdir, "info.db"),
 		Pieces:    config.Storage.Path,
 		Filestore: config.Filestore,
 	}

storagenode/piecestore/endpoint.go

@@ -53,6 +53,7 @@ type OldConfig struct {
 
 // Config defines parameters for piecestore endpoint.
 type Config struct {
+	DatabaseDir             string        `help:"directory to store databases. if empty, uses data path" default:""`
 	ExpirationGracePeriod   time.Duration `help:"how soon before expiration date should things be considered expired" default:"48h0m0s"`
 	MaxConcurrentRequests   int           `help:"how many concurrent requests are allowed, before uploads are rejected. 0 represents unlimited." default:"0"`
 	DeleteWorkers           int           `help:"how many piece delete workers" default:"0"`