debugging test failure

node/modules/chain.go

@@ -109,17 +109,21 @@ func LoadGenesis(genBytes []byte) func(dtypes.ChainBlockstore) Genesis {
 		return func() (header *types.BlockHeader, e error) {
 			c, err := car.LoadCar(bs, bytes.NewReader(genBytes))
 			if err != nil {
-				return nil, err
+				return nil, xerrors.Errorf("loading genesis car file failed: %w", err)
 			}
 			if len(c.Roots) != 1 {
 				return nil, xerrors.New("expected genesis file to have one root")
 			}
 			root, err := bs.Get(c.Roots[0])
 			if err != nil {
-				return &types.BlockHeader{}, err
+				return nil, err
 			}
 
-			return types.DecodeBlock(root.RawData())
+			h, err := types.DecodeBlock(root.RawData())
+			if err != nil {
+				return nil, xerrors.Errorf("decoding block failed: %w", err)
+			}
+			return h, nil
 		}
 	}
 }
@@ -130,12 +134,12 @@ func SetGenesis(cs *store.ChainStore, g Genesis) error {
 		return nil // already set, noop
 	}
 	if err != datastore.ErrNotFound {
-		return err
+		return xerrors.Errorf("getting genesis block failed: %w", err)
 	}
 
 	genesis, err := g()
 	if err != nil {
-		return err
+		return xerrors.Errorf("genesis func failed: %w", err)
 	}
 
 	return cs.SetGenesis(genesis)

node/modules/testing/genesis.go

@@ -36,14 +36,14 @@ func MakeGenesisMem(out io.Writer, template genesis.Template) func(bs dtypes.Cha
 			glog.Warn("Generating new random genesis block, note that this SHOULD NOT happen unless you are setting up new network")
 			b, err := genesis2.MakeGenesisBlock(context.TODO(), bs, syscalls, template)
 			if err != nil {
-				return nil, err
+				return nil, xerrors.Errorf("make genesis block failed: %w", err)
 			}
 			offl := offline.Exchange(bs)
 			blkserv := blockservice.New(bs, offl)
 			dserv := merkledag.NewDAGService(blkserv)
 
 			if err := car.WriteCarWithWalker(context.TODO(), dserv, []cid.Cid{b.Genesis.Cid()}, out, gen.CarWalkFunc); err != nil {
-				return nil, err
+				return nil, xerrors.Errorf("failed to write car file: %w", err)
 			}
 
 			return b.Genesis, nil