chg: remove manual reload logic

chg: remove manual reload logic

chgserver now validates and reloads configs automatically. Manually reloading
is no longer necessary. Besides, we are deprecating pid files since the server
will periodically check its ownership of the socket file and exit if it does
not own the socket file any longer, which works more reliable than a pid file.
This patch removes the SIGHUP reload logic from both chg server and client.

--- a/contrib/chg/README	Wed Mar 09 01:20:57 2016 +0000
+++ b/contrib/chg/README	Thu Mar 10 00:12:33 2016 +0000
@@ -13,7 +13,6 @@
  $ chg help                 # show help of Mercurial
  $ alias hg=chg             # replace hg command
  $ chg --kill-chg-daemon    # terminate background server
- $ chg --reload-chg-daemon  # reload configuration files
 
 Environment variables:
 
@@ -21,8 +20,7 @@
 changed after spawning the server. The following variables are specially
 handled:
 
- * configuration files are reloaded if HGPLAIN or HGPLAINEXCEPT changed, but
-   some behaviors won't change correctly.
+ * configuration files are reloaded automatically by default.
  * CHGHG or HG specifies the path to the hg executable spawned as the
    background command server.
 

--- a/contrib/chg/chg.1	Wed Mar 09 01:20:57 2016 +0000
+++ b/contrib/chg/chg.1	Thu Mar 10 00:12:33 2016 +0000
@@ -35,9 +35,6 @@
 .TP
 .B \-\-kill\-chg\-daemon
 Terminate the background command servers.
-.TP
-.B \-\-reload\-chg\-daemon
-Reload configuration files.
 .SH SEE ALSO
 .BR hg (1),
 .SH AUTHOR

--- a/contrib/chg/chg.c	Wed Mar 09 01:20:57 2016 +0000
+++ b/contrib/chg/chg.c	Thu Mar 10 00:12:33 2016 +0000
@@ -539,8 +539,6 @@
 		int sig = 0;
 		if (strcmp(argv[1], "--kill-chg-daemon") == 0)
 			sig = SIGTERM;
-		if (strcmp(argv[1], "--reload-chg-daemon") == 0)
-			sig = SIGHUP;
 		if (sig > 0) {
 			killcmdserver(&opts, sig);
 			return 0;

--- a/hgext/chgserver.py	Wed Mar 09 01:20:57 2016 +0000
+++ b/hgext/chgserver.py	Thu Mar 10 00:12:33 2016 +0000
@@ -28,9 +28,6 @@
 'validate' command
     reload the config and check if the server is up to date
 
-'SIGHUP' signal
-    reload configuration files
-
 Config
 ------
 
@@ -48,7 +45,6 @@
 import inspect
 import os
 import re
-import signal
 import struct
 import sys
 import threading
@@ -616,7 +612,6 @@
 
 class chgunixservice(commandserver.unixservice):
     def init(self):
-        signal.signal(signal.SIGHUP, self._reloadconfig)
         self._inithashstate()
         class cls(AutoExitMixIn, SocketServer.ForkingMixIn,
                   SocketServer.UnixStreamServer):
@@ -647,9 +642,6 @@
         os.symlink(os.path.basename(self.address), tempaddress)
         util.rename(tempaddress, self.baseaddress)
 
-    def _reloadconfig(self, signum, frame):
-        self.ui = self.server.ui = _renewui(self.ui)
-
     def run(self):
         try:
             self.server.serve_forever()