X-Git-Url: https://arthur.barton.de/gitweb/?a=blobdiff_plain;f=lib%2Fbup%2Fvfs.py;h=1c67577f000b6c458c781edd7086e050fe1d57e5;hb=d743b58427df26a64976412e25e7a0436cf56963;hp=14293dc202e8fb50172d8e1f03a9e29ecabcfba8;hpb=217eb3b7cc793f678e533993025d3be6747fe3e9;p=bup.git

diff --git a/lib/bup/vfs.py b/lib/bup/vfs.py
index 14293dc..1c67577 100644
--- a/lib/bup/vfs.py
+++ b/lib/bup/vfs.py
@@ -13,7 +13,9 @@ Each path is represented by an item that has least an item.meta which
 may be either a Metadata object, or an integer mode.  Functions like
 item_mode() and item_size() will return the mode and size in either
 case.  Any item.meta Metadata instances must not be modified directly.
-Make a copy to modify via item.meta.copy() if needed.
+Make a copy to modify via item.meta.copy() if needed, or call
+copy_item().
+
 
 The want_meta argument is advisory for calls that accept it, and it
 may not be honored.  Callers must be able to handle an item.meta value
@@ -49,6 +51,7 @@ from __future__ import absolute_import, print_function
 from collections import namedtuple
 from errno import ELOOP, ENOENT, ENOTDIR
 from itertools import chain, dropwhile, groupby, izip, tee
+from random import randrange
 from stat import S_IFDIR, S_IFLNK, S_IFREG, S_ISDIR, S_ISLNK, S_ISREG
 from time import localtime, strftime
 import exceptions, re, sys
@@ -273,13 +276,15 @@ def cache_notice(key, value):
     assert is_valid_cache_key(key)
     if key in _cache:
         return
-    _cache[key] = value
     if len(_cache) < _cache_max_items:
+        _cache_keys.append(key)
+        _cache[key] = value
         return
-    victim_i = random.randrange(0, len(_cache_keys))
+    victim_i = randrange(0, len(_cache_keys))
     victim = _cache_keys[victim_i]
+    del _cache[victim]
     _cache_keys[victim_i] = key
-    _cache.pop(victim)
+    _cache[key] = value
 
 
 def cache_get_commit_item(oid, need_meta=True):
@@ -309,9 +314,9 @@ def copy_item(item):
 
     """
     meta = getattr(item, 'meta', None)
-    if not meta:
-        return item
-    return(item._replace(meta=meta.copy()))
+    if isinstance(meta, Metadata):
+        return(item._replace(meta=meta.copy()))
+    return item
 
 def item_mode(item):
     """Return the integer mode (stat st_mode) for item."""