Found and fixed some more sneaky Python3 str->bytes problems

fs/base.py

@@ -39,7 +39,7 @@ from fs.local_functools import wraps
 
 import compatibility
 import six
-from six import PY3
+from six import PY3, b
 
 class DummyLock(object):
     """A dummy lock object that doesn't do anything.
@@ -112,13 +112,13 @@ class NullFile(object):
         raise StopIteration
 
     def readline(self, *args, **kwargs):
-        return ""
+        return b("")
 
     def close(self):
         self.closed = True
 
     def read(self, size=None):
-        return ""
+        return b("")
 
     def seek(self, *args, **kwargs):
         pass

fs/ftpfs.py

@@ -667,7 +667,7 @@ class _FTPFile(object):
                     break
                 chunks.append(data)
                 self.read_pos += len(data)
-            return ''.join(chunks)
+            return b('').join(chunks)
 
         remaining_bytes = size
         while remaining_bytes:

fs/memoryfs.py

@@ -21,6 +21,7 @@ from os import SEEK_END
 import threading
 
 import six
+from six import b
 
 
 def _check_mode(mode, mode_chars):
@@ -574,7 +575,7 @@ class MemoryFS(FS):
         if dir_entry.isdir():
             info['st_mode'] = 0755 | stat.S_IFDIR
         else:
-            info['size'] = len(dir_entry.data or '')
+            info['size'] = len(dir_entry.data or b(''))
             info['st_mode'] = 0666 | stat.S_IFREG
             
         return info    
@@ -630,7 +631,7 @@ class MemoryFS(FS):
             raise ResourceNotFoundError(path)
         if not dir_entry.isfile():
             raise ResourceInvalidError(path, msg="not a file: %(path)s")
-        return dir_entry.data or ''
+        return dir_entry.data or b('')
     
     @synchronize
     def setcontents(self, path, data, chunk_size=1024*64):

fs/remotefs.py

@@ -10,6 +10,9 @@ from json import dumps
 import Queue as queue
 import socket
 
+from six import b
+
+
 class PacketHandler(threading.Thread):
     
     def __init__(self, transport, prelude_callback=None):
@@ -99,7 +102,7 @@ class _SocketFile(object):
         try:
             return self.socket.recv(size)
         except:           
-            return ''        
+            return b('')        
     
     def write(self, data):
         self.socket.sendall(data)
@@ -145,7 +148,7 @@ class RemoteFS(FS):
         sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
         sock.connect((self.addr, self.port))
         socket_file = _SocketFile(sock)
-        socket_file.write('pyfs/0.1\n')
+        socket_file.write(b('pyfs/0.1\n'))
         return socket_file
     
     def _make_call(self, method_name, *args, **kwargs):
@@ -185,4 +188,4 @@ if __name__ == "__main__":
     
     rfs = RemoteFS()    
     rfs.close()
-    
+    
\ No newline at end of file

fs/watch.py

@@ -41,6 +41,8 @@ from fs.wrapfs import WrapFS
 from fs.base import FS
 from fs.filelike import FileWrapper
 
+from six import b
+
 
 class EVENT(object):
     """Base class for change notification events."""
@@ -304,7 +306,7 @@ class WatchableFS(WatchableFSMixin,WrapFS):
         self.notify_watchers(ACCESSED,path)
         return WatchedFile(f,self,path,mode)
 
-    def setcontents(self, path, data='', chunk_size=64*1024):
+    def setcontents(self, path, data=b(''), chunk_size=64*1024):
         existed = self.wrapped_fs.isfile(path)
         ret = super(WatchableFS, self).setcontents(path, data, chunk_size=chunk_size)
         if not existed: