multi: fix fmt.Errorf error wrapping

Refactor fmt.Errorf usage to correctly wrap errors instead of using
non-wrapping format verbs.

lntest/node/harness_node.go

@@ -327,7 +327,7 @@ func (hn *HarnessNode) ConnectRPCWithMacaroon(mac *macaroon.Macaroon) (
 		return err
 	}, wait.DefaultTimeout)
 	if err != nil {
-		return nil, fmt.Errorf("error reading TLS cert: %v", err)
+		return nil, fmt.Errorf("error reading TLS cert: %w", err)
 	}
 
 	opts := []grpc.DialOption{
@@ -343,7 +343,7 @@ func (hn *HarnessNode) ConnectRPCWithMacaroon(mac *macaroon.Macaroon) (
 	}
 	macCred, err := macaroons.NewMacaroonCredential(mac)
 	if err != nil {
-		return nil, fmt.Errorf("error cloning mac: %v", err)
+		return nil, fmt.Errorf("error cloning mac: %w", err)
 	}
 	opts = append(opts, grpc.WithPerRPCCredentials(macCred))
 
@@ -452,7 +452,7 @@ func (hn *HarnessNode) Start(ctxt context.Context) error {
 
 	// Wait till the server is starting.
 	if err := hn.WaitUntilStarted(); err != nil {
-		return fmt.Errorf("waiting for start got: %v", err)
+		return fmt.Errorf("waiting for start got: %w", err)
 	}
 
 	// Subscribe for topology updates.
@@ -544,7 +544,7 @@ func (hn *HarnessNode) waitTillServerState(
 		case <-time.After(wait.NodeStartTimeout):
 			return fmt.Errorf("timeout waiting for server state")
 		case err := <-errChan:
-			return fmt.Errorf("receive server state err: %v", err)
+			return fmt.Errorf("receive server state err: %w", err)
 
 		case <-done:
 			return nil
@@ -906,7 +906,7 @@ func executePgQuery(query string) error {
 		postgresDatabaseDsn("postgres"),
 	)
 	if err != nil {
-		return fmt.Errorf("unable to connect to database: %v", err)
+		return fmt.Errorf("unable to connect to database: %w", err)
 	}
 	defer pool.Close()
 

lntest/node/watcher.go

@@ -245,7 +245,7 @@ func (nw *nodeWatcher) WaitForChannelPolicyUpdate(
 		case <-timer:
 			expected, err := json.MarshalIndent(policy, "", "\t")
 			if err != nil {
-				return fmt.Errorf("encode policy err: %v", err)
+				return fmt.Errorf("encode policy err: %w", err)
 			}
 			policies, err := syncMapToJSON(
 				&nw.state.policyUpdates.Map,
@@ -274,7 +274,7 @@ func syncMapToJSON(state *sync.Map) ([]byte, error) {
 	})
 	policies, err := json.MarshalIndent(m, "", "\t")
 	if err != nil {
-		return nil, fmt.Errorf("encode polices err: %v", err)
+		return nil, fmt.Errorf("encode polices err: %w", err)
 	}
 
 	return policies, nil