Perform the checking STDOUT in CLI without changing the SDK

CHANGELOG.md

@@ -6,9 +6,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+* Support '-' as stdout alias
+
 ### Fixed
 
-* Fix to support '-' as stdout alias
+* Fix unable to use '/dev/stdout' by checking the localFileName if that present the `STDOUT` of OS
 
 ### Infrastructure
 * Fix gathering licenses of typeshed libraries

b2/console_tool.py

@@ -1369,15 +1369,21 @@ class DownloadFileMixin(
     MaxDownloadStreamsMixin,
     DownloadCommand,
 ):
-    def correct_local_file_name(self, filename: str):
-        if filename != '-':
-            return filename
-        if os.path.exists('-'):
-            self._print_stderr(
-                "WARNING: Filename `-` won't be supported in the future and will be treated as stdout alias."
-            )
-            return filename
-        return 'CON' if platform.system() == 'Windows' else '/dev/stdout'
+    def get_download_info_from_local_filename(self, filename: str):
+        stdout_file_path = 'CON' if platform.system() == 'Windows' else '/dev/stdout'
+
+        if filename == '-':
+            if os.path.exists('-'):
+                self._print_stderr(
+                    "WARNING: Filename `-` won't be supported in the future and will be treated as stdout alias."
+                )
+                return filename, 'wb+', True
+            return stdout_file_path, 'wb', False
+
+        allow_seeking = filename != stdout_file_path
+        mode = 'wb+' if allow_seeking else 'wb'
+
+        return filename, mode, allow_seeking
 
 
 @B2.register_subcommand
@@ -1407,15 +1413,16 @@ def _setup_parser(cls, parser):
         super()._setup_parser(parser)
 
     def run(self, args):
-        args.localFileName = self.correct_local_file_name(args.localFileName)
+        args.localFileName, mode, allow_seeking = self.get_download_info_from_local_filename(args.localFileName)
+
         progress_listener = make_progress_listener(args.localFileName, args.noProgress)
         encryption_setting = self._get_source_sse_setting(args)
         self._set_threads_from_args(args)
         downloaded_file = self.api.download_file_by_id(
             args.fileId, progress_listener, encryption=encryption_setting
         )
         self._print_download_info(downloaded_file)
-        downloaded_file.save_to(args.localFileName)
+        downloaded_file.save_to(args.localFileName, mode, allow_seeking)
         self._print('Download finished')
         return 0
 
@@ -1447,7 +1454,8 @@ def _setup_parser(cls, parser):
         super()._setup_parser(parser)
 
     def run(self, args):
-        args.localFileName = self.correct_local_file_name(args.localFileName)
+        args.localFileName, mode, allow_seeking = self.get_download_info_from_local_filename(args.localFileName)
+
         self._set_threads_from_args(args)
         bucket = self.api.get_bucket_by_name(args.bucketName)
         progress_listener = make_progress_listener(args.localFileName, args.noProgress)
@@ -1456,7 +1464,7 @@ def run(self, args):
             args.b2FileName, progress_listener, encryption=encryption_setting
         )
         self._print_download_info(downloaded_file)
-        downloaded_file.save_to(args.localFileName)
+        downloaded_file.save_to(args.localFileName, mode, allow_seeking)
         self._print('Download finished')
         return 0