From: Robert Fairley <rfairley@redhat.com>
Date: Wed, 17 Jun 2020 10:14:19 -0400
Subject: [PATCH] examples/nm-dispatcher.dhcp: use sysconfig

Use the PEERNTP and NTPSERVERARGS environment variables from
/etc/sysconfig/network{-scripts}.

Co-Authored-By: Christian Glombek <cglombek@redhat.com>

diff --git a/examples/chrony.nm-dispatcher.dhcp b/examples/chrony.nm-dispatcher.dhcp
index 6ea4c37..a6ad35a 100644
--- a/examples/chrony.nm-dispatcher.dhcp
+++ b/examples/chrony.nm-dispatcher.dhcp
@@ -8,15 +8,23 @@ export LC_ALL=C
 interface=$1
 action=$2
 
+[ -f /etc/sysconfig/network ] && . /etc/sysconfig/network
+[ -f /etc/sysconfig/network-scripts/ifcfg-"${interface}" ] && \
+    . /etc/sysconfig/network-scripts/ifcfg-"${interface}"
+
 chronyc=/usr/bin/chronyc
-server_options=iburst
-server_dir=/var/run/chrony-dhcp
+server_options=${NTPSERVERARGS:-iburst}
+server_dir=/run/chrony-dhcp
 
 dhcp_server_file=$server_dir/$interface.sources
 dhcp_ntp_servers="$DHCP4_NTP_SERVERS $DHCP6_DHCP6_NTP_SERVERS"
 
 add_servers_from_dhcp() {
     rm -f "$dhcp_server_file"
+
+    # Don't add NTP servers if PEERNTP=no specified; return early.
+    [ "$PEERNTP" = "no" ] && return
+
     for server in $dhcp_ntp_servers; do
         # Check for invalid characters (from the DHCPv6 NTP FQDN suboption)
         len1=$(printf '%s' "$server" | wc -c)