Move hg from storing files in data with base64 encoding to full

pathnames with .i and .d extensions. This means we naturally get good
FS layout, and cp and tar fix things up nicely rather than pessimizing
layout.

mercurial/hg.py

@@ -5,7 +5,7 b''
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
-import sys, struct, sha, socket, os, time, base64, re, urllib2
+import sys, struct, sha, socket, os, time, re, urllib2
 import urllib
 from mercurial import byterange
 from mercurial.transaction import *
@@ -14,16 +14,7 b' from difflib import SequenceMatcher'
 
 class filelog(revlog):
     def __init__(self, opener, path):
-        s = self.encodepath(path)
-        revlog.__init__(self, opener, os.path.join("data", s + "i"),
-                        os.path.join("data", s))
-
-    def encodepath(self, path):
-        s = sha.sha(path).digest()
-        s = base64.encodestring(s)[:-3]
-        s = re.sub("\+", "%", s)
-        s = re.sub("/", "_", s)
-        return s
+        revlog.__init__(self, opener, path + ".i", path + ".d")
 
     def read(self, node):
         return self.revision(node)
@@ -210,11 +201,17 b' def opener(base):'
 
         f = os.path.join(p, path)
 
-        if mode != "r" and os.path.isfile(f):
-            s = os.stat(f)
-            if s.st_nlink > 1:
-                file(f + ".tmp", "w").write(file(f).read())
-                os.rename(f+".tmp", f)
+        if mode != "r":
+            try:
+                s = os.stat(f)
+            except OSError:
+                d = os.path.dirname(f)
+                if not os.path.isdir(d):
+                    os.makedirs(d)
+            else:
+                if s.st_nlink > 1:
+                    file(f + ".tmp", "w").write(file(f).read())
+                    os.rename(f+".tmp", f)
 
         return file(f, mode)