Fix: Do not close the file before uploads finish

Signed-off-by: Knut Ahlers <knut@ahlers.me>

main.go

@@ -86,7 +86,23 @@ func main() {
 		logrus.Fatal("Usage: publish-vod <filename>")
 	}
 
-	if err = startUploads(ctx, rconfig.Args()[1], configFile, wg, barPool, longestPrefix); err != nil {
+	fileName := rconfig.Args()[1]
+
+	f, err := os.Open(fileName) //#nosec G304 // Intended to open and upload arbitrary file
+	if err != nil {
+		logrus.WithError(err).Fatal("opening VoD")
+	}
+	defer f.Close() //nolint:errcheck // File is closed by process exit
+
+	stat, err := f.Stat()
+	if err != nil {
+		logrus.WithError(err).Fatal("getting VoD stat")
+	}
+
+	if err = startUploads(
+		ctx, wg, barPool, longestPrefix, configFile,
+		fileName, f, stat.Size(),
+	); err != nil {
 		logrus.WithError(err).Fatal("starting uploads")
 	}
 
@@ -135,23 +151,14 @@ func preflight(ctx context.Context, configFile config.File) (longestPrefix int,
 
 func startUploads(
 	ctx context.Context,
-	fileName string,
-	configFile config.File,
 	wg *sync.WaitGroup,
 	barPool *pb.Pool,
 	longestPrefix int,
+	configFile config.File,
+	fileName string,
+	fileReader io.ReaderAt,
+	fileSize int64,
 ) (err error) {
-	f, err := os.Open(fileName) //#nosec G304 // Intended to open and upload arbitrary file
-	if err != nil {
-		return fmt.Errorf("opening VoD: %w", err)
-	}
-	defer f.Close() //nolint:errcheck // File is closed by process exit
-
-	stat, err := f.Stat()
-	if err != nil {
-		return fmt.Errorf("getting VoD stat: %w", err)
-	}
-
 	for id := range configFile.Uploaders {
 		if cfg.Limit != nil && !str.StringInSlice(id, cfg.Limit) {
 			continue
@@ -161,7 +168,7 @@ func startUploads(
 
 		wg.Add(1)
 
-		bar := pb.New64(stat.Size())
+		bar := pb.New64(fileSize)
 		bar.SetTemplate(pb.Full)
 		barPool.Add(bar)
 
@@ -175,8 +182,8 @@ func startUploads(
 				Config: c.Settings,
 
 				Filename: fileName,
-				Content:  io.NewSectionReader(f, 0, stat.Size()),
-				Size:     stat.Size(),
+				Content:  io.NewSectionReader(fileReader, 0, fileSize),
+				Size:     fileSize,
 
 				ProgressBar: bar,
 				FinalMessage: func(format string, opts ...any) {