more on cybertools.storage.filesystem for use with loops ExternalFile

git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@1546 fd906abe-77d9-0310-91a1-e0d9ade77398

storage/README.txt

@@ -13,4 +13,7 @@ Controlling the storage of data
   >>> storage.getDir('demo')
   '/home/.../cybertools/storage/testdata/demo'
 
-
+  >>> from cybertools.storage.filesystem import instanceVarSubdirectoryStorage
+  >>> storage = instanceVarSubdirectoryStorage()
+  >>> storage.getDir('demo')
+  '.../var/extfiles/demo'

storage/filesystem.py

@@ -23,6 +23,7 @@ $Id$
 """
 
 import os
+import cybertools
 from zope.interface import implements
 from cybertools.storage.interfaces import IExternalStorage
 
@@ -47,6 +48,7 @@ class FileSystemStorage(object):
         f = open(fn, 'wb')
         f.write(data)
         f.close()
+        print 'cybertools.storage: file %s written' % fn
 
     def getData(self, address, params={}):
         subDir = params.get('subdirectory')
@@ -63,5 +65,7 @@ def explicitDirectoryStorage(dirname):
 
 
 def instanceVarSubdirectoryStorage(dirname=DEFAULT_DIRECTORY):
-    instanceHome = '';
-    return FileSystemStorage(instanceHome, dirname)
+    instanceHome = os.path.dirname(os.path.dirname(os.path.dirname(
+                        os.path.dirname(cybertools.__file__))))
+    varDir = os.path.join(instanceHome, 'var');
+    return FileSystemStorage(varDir, dirname)