add function to register files that should be ignore... make this

the first function called in the chain, this mean no more anoying
'no mime-type for: media/.DS_Store' messages...  should we just
ignore dot files?

[git-p4: depot-paths = "//depot/": change = 865]

FSStorage.py

@@ -19,17 +19,31 @@ from twisted.python import log
 from twisted.internet import abstract, interfaces, process, protocol, reactor
 from zope.interface import implements
 
-__all__ = [ 'registerklassfun', 'FSObject', 'FSItem', 'FSVideoItem',
-		'FSAudioItem', 'FSTextItem', 'FSImageItem', 'mimetoklass',
-		'FSDirectory',
+__all__ = [ 'registerklassfun', 'registerfiletoignore',
+		'FSObject', 'FSItem', 'FSDirectory',
+		'FSVideoItem', 'FSAudioItem', 'FSTextItem', 'FSImageItem',
+		'mimetoklass',
 	]
 
 mimedict = static.loadMimeTypes()
 
-klassfuns = []
+_klassfuns = []
 
 def registerklassfun(fun):
-	klassfuns.append(fun)
+	_klassfuns.append(fun)
+
+_filestoignore = {
+		'.DS_Store': None
+	}
+
+def registerfiletoignore(f):
+	_filestoignore[f] = None
+
+# Return this class when you want the file to be skipped.  If you return this,
+# no other modules will be applied, and it won't be added.  Useful for things
+# like .DS_Store which are known to useless on a media server.
+class IgnoreFile:
+	pass
 
 def statcmp(a, b, cmpattrs = [ 'st_ino', 'st_dev', 'st_size', 'st_mtime', ]):
 	if a is None or b is None:
@@ -184,6 +198,12 @@ class FSItem(FSObject, Item):
 		self.res.append(Resource(self.url + '/xvid', 'http-get:*:%s:*' % 'video/avi'))
 		Item.doUpdate(self)
 
+def ignoreFiles(path, fobj):
+	if os.path.basename(path) in _filestoignore:
+		return IgnoreFile, None
+
+	return None, None
+
 def defFS(path, fobj):
 	if os.path.isdir(path):
 		# new dir
@@ -206,7 +226,7 @@ def dofileadd(cd, parent, path, name):
 		fobj = open(fsname)
 	except:
 		fobj = None
-	for i in itertools.chain(klassfuns, ( defFS, )):
+	for i in itertools.chain(( ignoreFiles, ), _klassfuns, ( defFS, )):
 		try:
 			try:
 				fobj.seek(0)	# incase the call expects a clean file
@@ -222,7 +242,7 @@ def dofileadd(cd, parent, path, name):
 			#traceback.print_exc(file=log.logfile)
 			pass
 
-	if klass is None:
+	if klass is None or klass is IgnoreFile:
 		return
 
 	#log.msg('matched:', os.path.join(path, name), `i`, `klass`)