lib.base.StatResult: Add type

Add the basic type StatResult. It is something akin to
os.stat_result, but with user and group string members instead of
st_uid and st_gid. The latter can't be expected to be stable across
remote contexts.

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/lib/base.py

@@ -28,3 +28,25 @@ class Result(NamedTuple):
             self.stderr.decode(encoding, errors=errors) if self.stderr is not None else None,
             self.status
         )
+
+class StatResult(NamedTuple):
+
+    mode: int
+    owner: str
+    group: str
+    size: int
+    atime: int
+    mtime: int
+    ctime: int
+
+    @classmethod
+    def from_os(cls, rhs: os.stat_result) -> StatResult:
+        import pwd, grp
+        return StatResult(
+            rhs.st_mode,
+            pwd.getpwuid(rhs.pw_uid).pw_name,
+            grp.getgrgid(gid).gr_name,
+            rhs.st_size,
+            rhs.st_mtime,
+            rhs.st_ctime,
+        )