[PATCH 2 of 3 RFC] url: remember http password database in ui object

[liscju]

# HG changeset patch
# User liscju <piotr.listkiewicz at gmail.com>
# Date 1465465296 -7200
#      Thu Jun 09 11:41:36 2016 +0200
# Node ID 4d9b3b414988081cb9b8bc19f8533cf2f13195f4
# Parent  45be12e882c975ff1acfa368d65bff7729eae593
url: remember http password database in ui object

This makes http password database stored permanently
in ui object. The question is when this database should
be cleared, usually there is no need to do this,
but with commandserver.runcommand it probably should but
I don't know where to do this.

diff --git a/mercurial/ui.py b/mercurial/ui.py
--- a/mercurial/ui.py
+++ b/mercurial/ui.py
@@ -26,6 +26,7 @@ from . import (
     formatter,
     progress,
     scmutil,
+    url,
     util,
 )
 
@@ -124,6 +125,8 @@ class ui(object):
             self.callhooks = src.callhooks
             self.insecureconnections = src.insecureconnections
             self.fixconfig()
+
+            self.httppasswordmgrdb = src.httppasswordmgrdb
         else:
             self.fout = sys.stdout
             self.ferr = sys.stderr
@@ -135,6 +138,8 @@ class ui(object):
             for f in scmutil.rcpath():
                 self.readconfig(f, trust=True)
 
+            self.httppasswordmgrdb = url.passwordmgrdb()
+
     def copy(self):
         return self.__class__(self)
 
diff --git a/mercurial/url.py b/mercurial/url.py
--- a/mercurial/url.py
+++ b/mercurial/url.py
@@ -367,7 +367,7 @@ if has_https:
             keepalive.KeepAliveHandler.__init__(self)
             urlreq.httpshandler.__init__(self)
             self.ui = ui
-            self.pwmgr = passwordmgr(self.ui, passwordmgrdb())
+            self.pwmgr = passwordmgr(self.ui, self.ui.httppasswordmgrdb)
 
         def _start_transaction(self, h, req):
             _generic_start_transaction(self, h, req)
@@ -482,7 +482,9 @@ def opener(ui, authinfo=None):
     # experimental config: ui.usehttp2
     if ui.configbool('ui', 'usehttp2', False):
         handlers = [
-            httpconnectionmod.http2handler(ui, passwordmgr(ui, passwordmgrdb()))
+            httpconnectionmod.http2handler(
+                ui,
+                passwordmgr(ui, ui.httppasswordmgrdb))
         ]
     else:
         handlers = [httphandler()]
@@ -491,7 +493,7 @@ def opener(ui, authinfo=None):
 
     handlers.append(proxyhandler(ui))
 
-    passmgr = passwordmgr(ui, passwordmgrdb())
+    passmgr = passwordmgr(ui, ui.httppasswordmgrdb)
     if authinfo is not None:
         passmgr.add_password(*authinfo)
         user, passwd = authinfo[2:4]