OSFSOpener: use os.path functions instead of fs.path functions.

The fs.path functions break UNC paths in a variety of intersting ways.
This fixes issue #76.

fs/expose/importhook.py

@@ -32,6 +32,7 @@ an SFTP server::
 
 """
 
+import os
 import sys
 import imp
 import marshal
@@ -58,12 +59,14 @@ class FSImportHook(object):
         #  If given a string, try to open it as an FS url.
         #  Don't open things on the local filesystem though.
         if isinstance(fs_or_url,basestring):
-            if ":" not in fs_or_url:
+            if ":/" not in fs_or_url:
                 raise ImportError
             try:
                 self.fs = fsopendir(fs_or_url)
             except OpenerError:
                 raise ImportError
+            except (CreateFailedError,ResourceNotFoundError,):
+                raise ImportError
             self.path = fs_or_url
         #  Otherwise, it must be an FS object of some sort.
         else:

fs/opener.py

@@ -84,10 +84,7 @@ def _expand_syspath(path):
     if path is None:
         return path
     path = os.path.expanduser(os.path.expandvars(path))
-    path = path.replace('\\', '/')
-    if not path.startswith('/'):
-        path = os.path.join(getcwd(), path)        
-    path = normpath(path)
+    path = os.path.normpath(os.path.abspath(path))
     return path
     
 def _parse_credentials(url):
@@ -208,7 +205,6 @@ class OpenerRegistry(object):
                 fs_url = '%s!%s' % (fs_url, '!'.join(paths))
             
             fs_name = fs_name or self.default_opener
-                
         else:
             fs_name = default_fs_name or self.default_opener
             fs_url = _expand_syspath(fs_url) 
@@ -340,11 +336,11 @@ class OSFSOpener(Opener):
     def get_fs(cls, registry, fs_name, fs_name_params, fs_path, writeable, create_dir):
         from fs.osfs import OSFS 
                                             
-        path = normpath(fs_path)
+        path = os.path.normpath(fs_path)
         if create_dir and not os.path.exists(path):
             from fs.osfs import _os_makedirs                    
             _os_makedirs(path)            
-        dirname, resourcename = pathsplit(fs_path)
+        dirname, resourcename = os.path.split(fs_path)
         osfs = OSFS(dirname)
         return osfs, resourcename                
         
@@ -862,3 +858,4 @@ opener = OpenerRegistry([OSFSOpener,
 
 fsopen = opener.open
 fsopendir = opener.opendir
+