create: do not store user/group for stdin data by default, see #7249

if you want user/group stored, give --stdin-user=USER / --stdin-group=GROUP.

src/borg/archiver/create_cmd.py

@@ -30,7 +30,6 @@ from ..manifest import Manifest
 from ..patterns import PatternMatcher
 from ..platform import is_win32
 from ..platform import get_flags
-from ..platform import uid2user, gid2group
 
 from ..logger import create_logger
 
@@ -718,15 +717,15 @@ class CreateMixIn:
             "--stdin-user",
             metavar="USER",
             dest="stdin_user",
-            default=uid2user(0),
-            help="set user USER in archive for stdin data (default: %(default)r)",
+            default=None,
+            help="set user USER in archive for stdin data (default: do not store user/uid)",
         )
         subparser.add_argument(
             "--stdin-group",
             metavar="GROUP",
             dest="stdin_group",
-            default=gid2group(0),
-            help="set group GROUP in archive for stdin data (default: %(default)r)",
+            default=None,
+            help="set group GROUP in archive for stdin data (default: do not store group/gid)",
         )
         subparser.add_argument(
             "--stdin-mode",

src/borg/testsuite/archiver/create_cmd.py

@@ -160,8 +160,6 @@ class ArchiverTestCase(ArchiverTestCaseBase):
         input_data = b"\x00foo\n\nbar\n   \n"
         self.cmd(f"--repo={self.repository_location}", "create", "test", "-", input=input_data)
         item = json.loads(self.cmd(f"--repo={self.repository_location}", "list", "test", "--json-lines"))
-        assert item["uid"] == 0
-        assert item["gid"] == 0
         assert item["size"] == len(input_data)
         assert item["path"] == "stdin"
         extracted_data = self.cmd(
@@ -185,8 +183,6 @@ class ArchiverTestCase(ArchiverTestCaseBase):
             input_data,
         )
         item = json.loads(self.cmd(f"--repo={self.repository_location}", "list", "test", "--json-lines"))
-        assert item["uid"] == 0
-        assert item["gid"] == 0
         assert item["size"] == len(input_data) + 1  # `echo` adds newline
         assert item["path"] == name
         extracted_data = self.cmd(f"--repo={self.repository_location}", "extract", "test", "--stdout")