can we store it? YES WE CAN

node/builder.go

@@ -249,7 +249,6 @@ func Config(cfg *config.Root) Option {
 		),
 
 		ApplyIf(func(s *Settings) bool { return s.nodeType == nodeStorageMiner },
-			Override(new(*sectorbuilder.SectorBuilderConfig), modules.SectorBuilderConfig),
 			Override(new(*sectorbuilder.SectorBuilder), sectorbuilder.New),
 		),
 	)

node/impl/storminer.go

@@ -1,6 +1,9 @@
 package impl
 
 import (
+	"context"
+	"io/ioutil"
+
 	"github.com/filecoin-project/go-lotus/api"
 	"github.com/filecoin-project/go-lotus/lib/sectorbuilder"
 )
@@ -11,4 +14,24 @@ type StorageMinerAPI struct {
 	SectorBuilder *sectorbuilder.SectorBuilder
 }
 
+func (sm *StorageMinerAPI) StoreGarbageData(ctx context.Context) (uint64, error) {
+	data := make([]byte, 1024)
+	fi, err := ioutil.TempFile("", "lotus-garbage")
+	if err != nil {
+		return 0, err
+	}
+
+	if _, err := fi.Write(data); err != nil {
+		return 0, err
+	}
+	fi.Close()
+
+	sectorId, err := sm.SectorBuilder.AddPiece("foo", 1024, fi.Name())
+	if err != nil {
+		return 0, err
+	}
+
+	return sectorId, err
+}
+
 var _ api.StorageMiner = &StorageMinerAPI{}

node/modules/core.go

@@ -219,22 +219,24 @@ func LoadGenesis(genBytes []byte) func(blockstore.Blockstore) Genesis {
 	}
 }
 
-func SectorBuilderConfig(storagePath string) (*sectorbuilder.SectorBuilderConfig, error) {
-	metadata := filepath.Join(storagePath, "meta")
-	sealed := filepath.Join(storagePath, "sealed")
-	staging := filepath.Join(storagePath, "staging")
+func SectorBuilderConfig(storagePath string) func() (*sectorbuilder.SectorBuilderConfig, error) {
+	return func() (*sectorbuilder.SectorBuilderConfig, error) {
+		metadata := filepath.Join(storagePath, "meta")
+		sealed := filepath.Join(storagePath, "sealed")
+		staging := filepath.Join(storagePath, "staging")
 
-	// TODO: get the address of the miner actor
-	minerAddr, err := address.NewIDAddress(42)
-	if err != nil {
-		return nil, err
+		// TODO: get the address of the miner actor
+		minerAddr, err := address.NewIDAddress(42)
+		if err != nil {
+			return nil, err
+		}
+
+		return &sectorbuilder.SectorBuilderConfig{
+			Miner:       minerAddr,
+			SectorSize:  1024,
+			MetadataDir: metadata,
+			SealedDir:   sealed,
+			StagedDir:   staging,
+		}, nil
 	}
-
-	return &sectorbuilder.SectorBuilderConfig{
-		Miner:       minerAddr,
-		SectorSize:  1024,
-		MetadataDir: metadata,
-		SealedDir:   sealed,
-		StagedDir:   staging,
-	}, nil
 }