add method MountFlags.tonames

It provides part of the functionality of MountFlags.tostr.

1 files changed, 8 insertions, 5 deletions

diff --git a/linuxnamespaces/syscalls.py b/linuxnamespaces/syscalls.py
index c4edad2..7f17c9f 100644
--- a/linuxnamespaces/syscalls.py
+++ b/linuxnamespaces/syscalls.py
@@ -256,22 +256,25 @@ class MountFlags(enum.IntFlag):
         reverse=True,
     )
 
-    def tostr(self) -> str:
-        """Attempt to represent the flags in a comma-separated, textual way."""
+    def tonames(self) -> list[str]:
+        """Represent the flags as a sequence of list of flag names."""
         if (self & MountFlags.PROPAGATION_FLAGS).bit_count() > 1:
             raise ValueError("cannot represent conflicting propagation flags")
         parts: list[str] = []
         remain = self
         for val, text in MountFlags.__flagvals:
-            # Older mypy think MountFlags.__flagvals and thus text was of type
-            # MountFlags.
+            # Older mypy wrongly deduces the type of MountFlags.__flagvals.
             assert isinstance(text, str)
             if remain & val == val:
                 parts.insert(0, text)
                 remain &= ~val
         if remain:
             raise ValueError("cannot represent flags {remain}")
-        return ",".join(parts)
+        return parts
+
+    def tostr(self) -> str:
+        """Represent the flags in a comma-separated, textual way."""
+        return ",".join(self.tonames())
 
 
 class MountSetattrFlags(enum.IntFlag):