chanbackup: disable channel backup for anchor types

chanbackup/backup.go

@@ -62,6 +62,12 @@ func FetchBackupForChan(chanPoint wire.OutPoint,
 		return nil, fmt.Errorf("unable to find target channel")
 	}
 
+	// TODO(halseth): support chan backups for anchor types.
+	if targetChan.ChanType.HasAnchors() {
+		return nil, fmt.Errorf("channel type does not support " +
+			"backups yet")
+	}
+
 	// Once we have the target channel, we can assemble the backup using
 	// the source to obtain any extra information that we may need.
 	staticChanBackup, err := assembleChanBackup(chanSource, targetChan)
@@ -85,14 +91,19 @@ func FetchStaticChanBackups(chanSource LiveChannelSource) ([]Single, error) {
 	// Now that we have all the channels, we'll use the chanSource to
 	// obtain any auxiliary information we need to craft a backup for each
 	// channel.
-	staticChanBackups := make([]Single, len(openChans))
+	staticChanBackups := make([]Single, 0, len(openChans))
-	for i, openChan := range openChans {
+	for _, openChan := range openChans {
+		// TODO(halseth): support chan backups for anchor types.
+		if openChan.ChanType.HasAnchors() {
+			continue
+		}
+
 		chanBackup, err := assembleChanBackup(chanSource, openChan)
 		if err != nil {
 			return nil, err
 		}
 
-		staticChanBackups[i] = *chanBackup
+		staticChanBackups = append(staticChanBackups, *chanBackup)
 	}
 
 	return staticChanBackups, nil

chanbackup/pubsub.go

@@ -213,6 +213,12 @@ func (s *SubSwapper) backupUpdater() {
 			// For all new open channels, we'll create a new SCB
 			// given the required information.
 			for _, newChan := range chanUpdate.NewChans {
+				// TODO(halseth): support chan backups for
+				// anchor types.
+				if newChan.ChanType.HasAnchors() {
+					continue
+				}
+
 				log.Debugf("Adding channel %v to backup state",
 					newChan.FundingOutpoint)