fix #3011 (missing blockfile) when splitting durable sessions (#3125)

Author: sawka

pkg/blockcontroller/durableshellcontroller.go

@@ -7,11 +7,13 @@ import (
 	"context"
 	"encoding/base64"
 	"fmt"
+	"io/fs"
 	"log"
 	"sync"
 	"time"
 
 	"github.com/google/uuid"
+	"github.com/wavetermdev/waveterm/pkg/filestore"
 	"github.com/wavetermdev/waveterm/pkg/jobcontroller"
 	"github.com/wavetermdev/waveterm/pkg/remote"
 	"github.com/wavetermdev/waveterm/pkg/remote/conncontroller"
@@ -163,6 +165,10 @@ func (dsc *DurableShellController) Start(ctx context.Context, blockMeta waveobj.
 
 	if jobId == "" {
 		log.Printf("block %q starting new durable shell\n", dsc.BlockId)
+		fsErr := filestore.WFS.MakeFile(ctx, dsc.BlockId, wavebase.BlockFile_Term, nil, wshrpc.FileOpts{MaxSize: DefaultTermMaxFileSize, Circular: true})
+		if fsErr != nil && fsErr != fs.ErrExist {
+			return fmt.Errorf("error creating block term file: %w", fsErr)
+		}
 		newJobId, err := dsc.startNewJob(ctx, blockMeta, dsc.ConnName, rtOpts)
 		if err != nil {
 			return fmt.Errorf("failed to start new job: %w", err)