loggerd: move to system/ (#27534)

old-commit-hash: 94eb2159802d3dba99620db0b08731c68a7e4733

system/loggerd/xattr_cache.py

@@ -0,0 +1,23 @@
+import os
+import errno
+from typing import Dict, Tuple, Optional
+
+_cached_attributes: Dict[Tuple, Optional[bytes]] = {}
+
+def getxattr(path: str, attr_name: str) -> Optional[bytes]:
+  key = (path, attr_name)
+  if key not in _cached_attributes:
+    try:
+      response = os.getxattr(path, attr_name)
+    except OSError as e:
+      # ENODATA means attribute hasn't been set
+      if e.errno == errno.ENODATA:
+        response = None
+      else:
+        raise
+    _cached_attributes[key] = response
+  return _cached_attributes[key]
+
+def setxattr(path: str, attr_name: str, attr_value: bytes) -> None:
+  _cached_attributes.pop((path, attr_name), None)
+  return os.setxattr(path, attr_name, attr_value)