update NM DHCP dispatcher script

Updates the patch with downstream changes from
https://github.com/openshift/os/pull/486
and https://github.com/openshift/os/pull/494

chrony-nm-dispatcher-dhcp.patch

@@ -1,4 +1,4 @@
-From e0c6457fd42252f88ec60d16582b7b6e6fb04f41 Mon Sep 17 00:00:00 2001
+From 1b29e43133d992e735ffbf87d79f008994479036 Mon Sep 17 00:00:00 2001
 From: Robert Fairley <rfairley@redhat.com>
 Date: Wed, 17 Jun 2020 10:14:19 -0400
 Subject: [PATCH] examples/nm-dispatcher.dhcp: use sysconfig, detect dhclient
@@ -7,27 +7,39 @@ Use the PEERNTP and NTPSERVERARGS environment variables from
 /etc/sysconfig/network{-scripts}. Detect a dhclient install to avoid a
 redundant operation with the 11-dhclient NM dispatcher in the
 dhcp-client package.
+
+Co-Authored-By: Christian Glombek <cglombek@redhat.com>
 ---
- examples/chrony.nm-dispatcher.dhcp | 15 ++++++++++++++-
+ examples/chrony.nm-dispatcher.dhcp | 21 +++++++++++++++++++--
- 1 file changed, 14 insertions(+), 1 deletion(-)
+ 1 file changed, 19 insertions(+), 2 deletions(-)
 
 diff --git a/examples/chrony.nm-dispatcher.dhcp b/examples/chrony.nm-dispatcher.dhcp
-index 6ea4c37..878e72f 100644
+index 6ea4c37..a6ad35a 100644
 --- a/examples/chrony.nm-dispatcher.dhcp
 +++ b/examples/chrony.nm-dispatcher.dhcp
-@@ -6,6 +6,11 @@
+@@ -6,21 +6,39 @@
  
  export LC_ALL=C
  
 +# If a dhclient installation is present, avoid a redundant operation
-+# with dhclient which handles NTP server config through its own
++# in case dhclient handles NTP server config through its own chrony config script,
-+# NetworkManager dispatcher script 11-dhclient.
++# exec'ed by NetworkManager's 11-dhclient dispatcher script.
-+[ -e /usr/sbin/dhclient ] && exit 0
++# In RHCOS, 11-dhclient is excluded and not shipped with base image.
++[ -e /usr/sbin/dhclient ] && \
++    [ -e /etc/dhcp/dhclient.d/chrony.sh ] && \
++    [ -e /etc/NetworkManager/dispatcher.d/11-dhclient -o \
++      -e /usr/lib/NetworkManager/dispatcher.d/11-dhclient ] && \
++    exit 0
 +
  interface=$1
  action=$2
  
-@@ -17,10 +22,18 @@ dhcp_server_file=$server_dir/$interface.sources
+ chronyc=/usr/bin/chronyc
+ default_server_options=iburst
+-server_dir=/var/run/chrony-dhcp
++server_dir=/run/chrony-dhcp
+ 
+ dhcp_server_file=$server_dir/$interface.sources
  # DHCP4_NTP_SERVERS is passed from DHCP options by NetworkManager.
  nm_dhcp_servers=$DHCP4_NTP_SERVERS
  
@@ -48,17 +60,5 @@ index 6ea4c37..878e72f 100644
      $chronyc reload sources > /dev/null 2>&1 || :
  }
 -- 
-2.26.2
+2.29.2
 
-diff -up chrony-4.0-pre3/examples/chrony.nm-dispatcher.dhcp.nm-dispatcher-dhcp chrony-4.0-pre3/examples/chrony.nm-dispatcher.dhcp
---- chrony-4.0-pre3/examples/chrony.nm-dispatcher.dhcp.nm-dispatcher-dhcp	2020-08-26 09:27:47.076282468 +0200
-+++ chrony-4.0-pre3/examples/chrony.nm-dispatcher.dhcp	2020-08-26 09:27:51.847297974 +0200
-@@ -16,7 +16,7 @@ action=$2
- 
- chronyc=/usr/bin/chronyc
- default_server_options=iburst
--server_dir=/var/run/chrony-dhcp
-+server_dir=/run/chrony-dhcp
- 
- dhcp_server_file=$server_dir/$interface.sources
- # DHCP4_NTP_SERVERS is passed from DHCP options by NetworkManager.

chrony.spec

@@ -63,7 +63,7 @@ md5sum -c <<-EOF | (! grep -v 'OK$')
         2d01b94bc1a7b7fb70cbee831488d121  examples/chrony.conf.example2
         96999221eeef476bd49fe97b97503126  examples/chrony.keys.example
         6a3178c4670de7de393d9365e2793740  examples/chrony.logrotate
-        e051740bb4b21e2e12e6dc63f5195c48  examples/chrony.nm-dispatcher.dhcp
+        2da011da89727ef009799502d84e7cd0  examples/chrony.nm-dispatcher.dhcp
         8f5a98fcb400a482d355b929d04b5518  examples/chrony.nm-dispatcher.onoffline
         32c34c995c59fd1c3ad1616d063ae4a0  examples/chronyd.service
 EOF