[1.4.X] Set the post process cache when finished instead of one by one.

This should prevent a race condition if running collectstatic is
canceled or its cache is accessed from other processes, leaving the
cache in a corrupt state.

1 files changed, 6 insertions, 3 deletions

diff --git a/django/contrib/staticfiles/storage.py b/django/contrib/staticfiles/storage.py
index c000f97d05..7e35add65a 100644
--- a/django/contrib/staticfiles/storage.py
+++ b/django/contrib/staticfiles/storage.py
@@ -190,8 +190,8 @@ class CachedFilesMixin(object):
         if dry_run:
             return
 
-        # delete cache of all handled paths
-        self.cache.delete_many([self.cache_key(path) for path in paths])
+        # where to store the new paths
+        hashed_paths = {}
 
         # build a list of adjustable files
         matches = lambda path: matches_patterns(path, self._patterns.keys())
@@ -240,9 +240,12 @@ class CachedFilesMixin(object):
                         hashed_name = force_unicode(saved_name.replace('\\', '/'))
 
                 # and then set the cache accordingly
-                self.cache.set(self.cache_key(name), hashed_name)
+                hashed_paths[self.cache_key(name)] = hashed_name
                 yield name, hashed_name, processed
 
+        # Finally set the cache
+        self.cache.set_many(hashed_paths)
+
 
 class CachedStaticFilesStorage(CachedFilesMixin, StaticFilesStorage):
     """