/ etc / dhcp / dhclient-exit-hooks.d / [ HOME SHELL ]

Name	Size	Permission
debug	1.39 KB	-rw-r--r--
hook-dhclient	805 B	-rwxr-xr-x
ntp	1.37 KB	-rw-r--r--
ntpdate	794 B	-rw-r--r--
resolved	5.42 KB	-rwxr-xr-x
rfc3442-classless-routes	1.71 KB	-rw-r--r--
timesyncd	1.36 KB	-rw-r--r--

Code Editor : ntp

NTP_CONF=/etc/ntp.conf
NTP_DHCP_CONF=/run/ntp.conf.dhcp

ntp_server_restart() {
	invoke-rc.d ntp try-restart
}

ntp_servers_setup_remove() {
	if [ ! -e $NTP_DHCP_CONF ]; then
		return
	fi
	rm -f $NTP_DHCP_CONF
	ntp_server_restart
}

ntp_servers_setup_add() {
	networkd_ntp=$(sed -n 's/NTP=//p' /run/systemd/netif/leases/* 2>/dev/null)

if [ -z "$new_ntp_servers" ] && [ -z "$networkd_ntp" ]; then
		ntp_servers_setup_remove
		return
	fi

if [ -e $NTP_DHCP_CONF ] && [ "$new_ntp_servers" = "$old_ntp_servers" ] && [ -z "$networkd_ntp" ] ; then
		return
	fi

tmp=$(mktemp "$NTP_DHCP_CONF.XXXXXX") || return
	chmod --reference=$NTP_CONF $tmp
	chown --reference=$NTP_CONF $tmp

(
	  echo "# This file was copied from $NTP_CONF with the server options changed"
	  echo "# to reflect the information sent by the DHCP server.  Any changes made"
	  echo "# here will be lost at the next DHCP event.  Edit $NTP_CONF instead."
	  echo
	  echo "# NTP server entries received from DHCP server"
	  for server in $new_ntp_servers $networkd_ntp; do
		echo "server $server iburst"
	  done
	  echo
	  sed '/^[[:space:]]*$server\|peer\|pool$[[:space:]]/d' $NTP_CONF
	) >>$tmp
	
	mv $tmp $NTP_DHCP_CONF

ntp_server_restart
}

ntp_servers_setup() {
	case $reason in
		BOUND|RENEW|REBIND|REBOOT)
			ntp_servers_setup_add
			;;
		EXPIRE|FAIL|RELEASE|STOP)
			ntp_servers_setup_remove
			;;
	esac
}

ntp_servers_setup

Urban Research Lab

The Urban Research Lab (URL) at IIIT-Delhi was established in 2020, during a time when the pandemic brought the complexities of urban life more visible than ever. What started as an initiative by faculty and students has grown into a collaborative space for critically exploring and reimagining the urban questions through research, dialogue, and interdisciplinary engagement.

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Code Editor : ntp

Urban Research Lab