Transparent proxy support

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Transparent proxy support

Originally from "Michael S. Tsirkin" <[e-mail]>

manifest hash: 74cf7456ef35ff8d4c007544f0d1a57c69d3c929
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doc/hg.1.txt

@@ -188,6 +188,22 b' FILES'
     (which could be a local path or a remote URI), the format is 
     <symbolic name> <repository path> with each mapping on a seperate line
 
+NON_TRANSPARENT PROXY SUPPORT
+-----
+
+    To access a mercurial repository through a proxy,
+    create a file $HOME/.hgrc in the following format:
+
+[http_proxy]
+host=myproxy:8080
+user=<username>
+passwd=<password>
+no=<localhost1>,<localhost2>,<localhost3>,...
+
+    "user","passwd" fields are used for authenticating proxies,
+    "no" is a comma-separated list of local host names
+    for which proxy must be bypassed.
+
 BUGS
 ----
 Probably lots, please post them to the mailing list (See Resources below)

mercurial/hg.py

@@ -1228,6 +1228,36 b' class remoterepository:'
     def __init__(self, ui, path):
         self.url = path
         self.ui = ui
+        no_list = [ "localhost", "127.0.0.1" ]
+        host = ui.config("http_proxy", "host")
+        user = ui.config("http_proxy", "user")
+        passwd = ui.config("http_proxy", "passwd")
+        no = ui.config("http_proxy", "no")
+        if no:
+            no_list = no_list + no.split(",")
+            
+        no_proxy = 0
+        for h in no_list:
+            if (path.startswith("http://" + h + "/") or
+                path.startswith("http://" + h + ":") or
+                path == "http://" + h):
+                no_proxy = 1
+
+        # Note: urllib2 takes proxy values from the environment and those will
+        # take precedence
+
+        proxy_handler = urllib2.BaseHandler()
+        if host and not no_proxy:
+            proxy_handler = urllib2.ProxyHandler({"http" : "http://" + host})
+
+        authinfo = None
+        if user and passwd:
+            passmgr = urllib2.HTTPPasswordMgrWithDefaultRealm()
+            passmgr.add_password(None, host, user, passwd)
+            authinfo = urllib2.ProxyBasicAuthHandler(passmgr)
+
+        opener = urllib2.build_opener(proxy_handler, authinfo)
+        urllib2.install_opener(opener)
 
     def do_cmd(self, cmd, **args):
         self.ui.debug("sending %s command\n" % cmd)
@@ -1235,7 +1265,7 b' class remoterepository:'
         q.update(args)
         qs = urllib.urlencode(q)
         cu = "%s?%s" % (self.url, qs)
-        return urllib.urlopen(cu)
+        return urllib2.urlopen(cu)
 
     def heads(self):
         d = self.do_cmd("heads").read()