[PATCH] Accept file://localhost/ style urls as local

[Christian Ebert]

* Brendan Cully on Thursday, September 06, 2007 at 19:28:10 -0700
> I'd be tempted to just skip over the host part of a file: URL --
> anything other than a local hostname is probably useless anyway. But
> if that's a bad idea, I think we should at least look for localhost
> and 127.0.0.1 statically before doing any address lookup. That saves
> any silly DNS lookups for 99% of the time.

Another attempt:

# HG changeset patch
# User Christian Ebert <blacktrash at gmx.net>
# Date 1189077749 -7200
# Node ID acd92fec1e5a481b52ce989597a3113c465cf2f0
# Parent  f8c36b215281a7e8f3aaed632206d3627ee21e6e
Drop local hostnames with url scheme in file urls

diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -14,7 +14,7 @@ platform-specific details from the core.
 
 from i18n import _
 import cStringIO, errno, getpass, popen2, re, shutil, sys, tempfile, strutil
-import os, stat, threading, time, calendar, ConfigParser, locale, glob
+import os, stat, threading, time, calendar, ConfigParser, locale, glob, socket
 
 try:
     set = set
@@ -1674,10 +1674,24 @@ def bytecount(nbytes):
             return format % (nbytes / float(divisor))
     return units[-1][2] % nbytes
 
+def _localhostnames():
+    hl = []
+    for h in socket.gethostbyaddr(socket.gethostname()):
+        if isinstance(h, str):
+            h = [h]
+        hl += h
+    return hl
+
 def drop_scheme(scheme, path):
     sc = scheme + ':'
     if path.startswith(sc):
         path = path[len(sc):]
         if path.startswith('//'):
             path = path[2:]
+            if scheme == 'file' and not path.startswith('/'):
+                if path[:10] in ('localhost/', '127.0.0.1/'):
+                    return path[9:]
+                for h in _localhostnames():
+                    if path.startswith(h + '/'):
+                        return path[len(h):]
     return path