15397: Remove deprecated Python SDK facilities.

[arvados.git] / services / fuse / arvados_fuse / fusefile.py

diff --git a/services/fuse/arvados_fuse/fusefile.py b/services/fuse/arvados_fuse/fusefile.py
index 1b12d7e410ad323d37d6197ee819d7ea6a760d61..fce6c9b6146434050288e6be5ef436949b0b9b7d 100644 (file)
--- a/services/fuse/arvados_fuse/fusefile.py
+++ b/services/fuse/arvados_fuse/fusefile.py
@@ -2,7 +2,6 @@
 #
 # SPDX-License-Identifier: AGPL-3.0
 
-from __future__ import absolute_import
 import json
 import llfuse
 import logging
@@ -49,11 +48,12 @@ class File(FreshBase):
 class FuseArvadosFile(File):
     """Wraps a ArvadosFile."""
 
-    __slots__ = ('arvfile',)
+    __slots__ = ('arvfile', '_enable_write')
 
-    def __init__(self, parent_inode, arvfile, _mtime):
+    def __init__(self, parent_inode, arvfile, _mtime, enable_write):
         super(FuseArvadosFile, self).__init__(parent_inode, _mtime)
         self.arvfile = arvfile
+        self._enable_write = enable_write
 
     def size(self):
         with llfuse.lock_released:
@@ -71,16 +71,24 @@ class FuseArvadosFile(File):
         return False
 
     def writable(self):
-        return self.arvfile.writable()
+        return self._enable_write and self.arvfile.writable()
 
     def flush(self):
         with llfuse.lock_released:
             if self.writable():
                 self.arvfile.parent.root_collection().save()
 
+    def clear(self):
+        if self.parent_inode is None:
+            self.arvfile.fuse_entry = None
+            self.arvfile = None
+
 
 class StringFile(File):
     """Wrap a simple string as a file"""
+
+    __slots__ = ("contents",)
+
     def __init__(self, parent_inode, contents, _mtime):
         super(StringFile, self).__init__(parent_inode, _mtime)
         self.contents = contents
@@ -89,12 +97,14 @@ class StringFile(File):
         return len(self.contents)
 
     def readfrom(self, off, size, num_retries=0):
-        return self.contents[off:(off+size)]
+        return bytes(self.contents[off:(off+size)], encoding='utf-8')
 
 
 class ObjectFile(StringFile):
     """Wrap a dict as a serialized json object."""
 
+    __slots__ = ("object_uuid",)
+
     def __init__(self, parent_inode, obj):
         super(ObjectFile, self).__init__(parent_inode, "", 0)
         self.object_uuid = obj['uuid']
@@ -123,6 +133,9 @@ class FuncToJSONFile(StringFile):
     The function is called at the time the file is read. The result is
     cached until invalidate() is called.
     """
+
+    __slots__ = ("func",)
+
     def __init__(self, parent_inode, func):
         super(FuncToJSONFile, self).__init__(parent_inode, "", 0)
         self.func = func