# 
# patch "fs.py"
#  from [ea1a06ff477257b93d3e620fe0fdf02e488db4fe]
#    to [f571e9b863841b0cb2a55ff7e528cfc5991781e1]
# 
# patch "fs_http.py"
#  from [b5c05a4be6317cf55e146da0646dde0599ecd381]
#    to [d5d3296ad125d00865d83cce4ea508802ed228b9]
# 
========================================================================
--- fs.py	ea1a06ff477257b93d3e620fe0fdf02e488db4fe
+++ fs.py	f571e9b863841b0cb2a55ff7e528cfc5991781e1
@@ -1,13 +1,28 @@
 # interface to FS-like things
 
+import urlparse
 import os
 import os.path
 
+class BadURL(Exception):
+    pass
+
 def readable_fs_for_url(url):
-    return LocalReadableFS(url)
+    (scheme, host, path, param, query, frag) = urlparse(url, "file")
+    if scheme == "file":
+        return LocalReadableFS(path)
+    elif scheme in ("http", "https", "ftp"):
+        import fs_http
+        return fs_http.HTTPReadableFS(url)
+    else:
+        raise BadURL, url
 
 def writeable_fs_for_url(url):
-    return LocalWriteableFs(url)
+    (scheme, host, path, param, query, frag) = urlparse(url, "file")
+    if scheme == "file":
+        return LocalWriteableFs(path)
+    else:
+        raise BadURL, url
 
 class ReadableFS:
     # All operators are blocking
========================================================================
--- fs_http.py	b5c05a4be6317cf55e146da0646dde0599ecd381
+++ fs_http.py	d5d3296ad125d00865d83cce4ea508802ed228b9
@@ -8,7 +8,7 @@
         self.url = url
 
     def _url(self, filename):
-        return FIXME
+        return urlparse.urljoin(self.url, filename)
 
     def open_read(self, filename):
         return urlgrabber.urlopen(self._url(filename))