make repo.Blockstore() idempotent; wrap in IDStore.

node/repo/fsrepo.go

@@ -23,6 +23,7 @@ import (
 
 	"github.com/filecoin-project/lotus/extern/sector-storage/fsutil"
 	"github.com/filecoin-project/lotus/extern/sector-storage/stores"
+	lblockstore "github.com/filecoin-project/lotus/lib/blockstore"
 	badgerbs "github.com/filecoin-project/lotus/lib/blockstore/badger"
 
 	"github.com/filecoin-project/lotus/chain/types"
@@ -259,6 +260,10 @@ type fsLockedRepo struct {
 	dsErr  error
 	dsOnce sync.Once
 
+	bs     blockstore.Blockstore
+	bsErr  error
+	bsOnce sync.Once
+
 	storageLk sync.Mutex
 	configLk  sync.Mutex
 }
@@ -281,6 +286,13 @@ func (fsr *fsLockedRepo) Close() error {
 		}
 	}
 
+	// type assertion will return ok=false if fsr.bs is nil altogether.
+	if c, ok := fsr.bs.(io.Closer); ok && c != nil {
+		if err := c.Close(); err != nil {
+			return xerrors.Errorf("could not close blockstore: %w", err)
+		}
+	}
+
 	err = fsr.closer.Close()
 	fsr.closer = nil
 	return err
@@ -292,14 +304,24 @@ func (fsr *fsLockedRepo) Blockstore(domain BlockstoreDomain) (blockstore.Blockst
 		return nil, ErrInvalidBlockstoreDomain
 	}
 
+	fsr.bsOnce.Do(func() {
 		path := fsr.join(filepath.Join(fsDatastore, "chain"))
 		readonly := fsr.readonly
 
 		opts, err := BadgerBlockstoreOptions(domain, path, readonly)
 		if err != nil {
-		return nil, err
+			fsr.bsErr = err
+			return
 		}
-	return badgerbs.Open(opts)
+
+		bs, err := badgerbs.Open(opts)
+		if err != nil {
+			fsr.bsErr = err
+		}
+		fsr.bs = lblockstore.WrapIDStore(bs)
+	})
+
+	return fsr.bs, fsr.bsErr
 }
 
 // join joins path elements with fsr.path

node/repo/memrepo.go

@@ -161,7 +161,7 @@ func NewMemory(opts *MemRepoOptions) *MemRepo {
 
 	return &MemRepo{
 		repoLock:   make(chan struct{}, 1),
-		blockstore: lblockstore.NewTemporarySync(),
+		blockstore: lblockstore.WrapIDStore(lblockstore.NewTemporarySync()),
 		datastore:  opts.Ds,
 		configF:    opts.ConfigF,
 		keystore:   opts.KeyStore,