chgserver: change random state after fork

Before this patch, extensions expecting a different random state per command
will break since the chg request handler will inherit a same random state
from the parent daemon process.

This patch addresses the issue by calling random.seed() after fork.

hgext/chgserver.py

@@ -45,6 +45,7 b' import errno'
 import gc
 import inspect
 import os
+import random
 import re
 import struct
 import sys
@@ -540,6 +541,9 b' class _requesthandler(SocketServer.Strea'
         # process pass kernel "is_current_pgrp_orphaned" check so signals like
         # SIGTSTP, SIGTTIN, SIGTTOU are not ignored.
         os.setpgid(0, 0)
+        # change random state otherwise forked request handlers would have a
+        # same state inherited from parent.
+        random.seed()
         ui = self.server.ui
         repo = self.server.repo
         sv = None