fix: certain special single-file torrent downloads (#1136)

internal/protocol/bt/fetcher_test.go

@@ -3,17 +3,18 @@ package bt
 import (
 	"encoding/base64"
 	"encoding/json"
-	"github.com/GopeedLab/gopeed/internal/controller"
-	"github.com/GopeedLab/gopeed/internal/fetcher"
-	"github.com/GopeedLab/gopeed/internal/test"
-	"github.com/GopeedLab/gopeed/pkg/base"
-	"github.com/GopeedLab/gopeed/pkg/protocol/bt"
 	gohttp "net/http"
 	"net/url"
 	"os"
 	"path/filepath"
 	"reflect"
 	"testing"
+
+	"github.com/GopeedLab/gopeed/internal/controller"
+	"github.com/GopeedLab/gopeed/internal/fetcher"
+	"github.com/GopeedLab/gopeed/internal/test"
+	"github.com/GopeedLab/gopeed/pkg/base"
+	"github.com/GopeedLab/gopeed/pkg/protocol/bt"
 )
 
 func TestFetcher_Resolve_Torrent(t *testing.T) {

internal/protocol/bt/file.go

@@ -5,11 +5,12 @@ package bt
 import (
 	"context"
 	"fmt"
-	"github.com/anacrolix/torrent/storage"
 	"io"
 	"os"
 	"path/filepath"
 
+	"github.com/anacrolix/torrent/storage"
+
 	"github.com/anacrolix/missinggo/v2"
 
 	"github.com/anacrolix/torrent/common"
@@ -34,7 +35,7 @@ func newFileOpts(opts newFileClientOpts) storage.ClientImplCloser {
 	if opts.FilePathMaker == nil {
 		opts.FilePathMaker = func(opts storage.FilePathMakerOpts) string {
 			var parts []string
-			if opts.Info.Length == 0 {
+			if opts.Info.Length == 0 || opts.File.Path == nil {
 				parts = append(parts, opts.Info.Name)
 			}
 			return filepath.Join(append(parts, opts.File.Path...)...)