source: rtems-libbsd/dhcpcd/dhcpcd-hooks/50-ntp.conf @ f2ed769

# Sample dhcpcd hook script for ntp
# Like our resolv.conf hook script, we store a database of ntp.conf files
# and merge into /etc/ntp.conf

# You can set the env var NTP_CONF to another file like this
#   dhcpcd -e NTP_CONF=/usr/pkg/etc/ntpd.conf
# or by adding this to /etc/dhcpcd.enter-hook
#   NTP_CONF=/usr/pkg/etc/ntpd.conf
# to use openntpd from pkgsrc instead of the system provided ntp.

if type invoke-rc.d >/dev/null 2>&1; then
        # Debian has a seperate file for DHCP config to avoid stamping on
        # the master.
        [ -e /var/lib/ntp ] || mkdir /var/lib/ntp
        : ${ntp_service:=ntp}
        : ${NTP_DHCP_CONF:=/var/lib/ntp/ntp.conf.dhcp}
fi

: ${ntp_service:=ntpd}
: ${ntp_restart_cmd:=service_condcommand $ntp_service restart}
ntp_conf_dir="$state_dir/ntp.conf"
ntp_conf=${NTP_CONF:-/etc/ntp.conf}
NL="
"

build_ntp_conf()
{
        local cf="$state_dir/ntp.conf.$ifname"
        local interfaces= header= srvs= servers= x=

        # Build a list of interfaces
        interfaces=$(list_interfaces "$ntp_conf_dir")

        if [ -n "$interfaces" ]; then
                # Build the header
                for x in ${interfaces}; do
                        header="$header${header:+, }$x"
                done

                # Build a server list
                srvs=$(cd "$ntp_conf_dir";
                        key_get_value "server " $interfaces)
                if [ -n "$srvs" ]; then
                        for x in $(uniqify $srvs); do
                                servers="${servers}server $x$NL"
                        done
                fi
        fi

        # Merge our config into ntp.conf
        [ -e "$cf" ] && rm -f "$cf"
        [ -d "$ntp_conf_dir" ] || mkdir -p "$ntp_conf_dir"

        if [ -n "$NTP_DHCP_CONF" ]; then
                [ -e "$ntp_conf" ] && cp "$ntp_conf" "$cf"
                ntp_conf="$NTP_DHCP_CONF"
        elif [ -e "$ntp_conf" ]; then
                remove_markers "$signature_base" "$signature_base_end" \
                        "$ntp_conf" > "$cf"
        fi

        if [ -n "$servers" ]; then
                echo "$signature_base${header:+ $from }$header" >> "$cf"
                printf %s "$servers" >> "$cf"
                echo "$signature_base_end${header:+ $from }$header" >> "$cf"
        else
                [ -e "$ntp_conf" -a -e "$cf" ] || return
        fi

        # If we changed anything, restart ntpd
        if change_file "$ntp_conf" "$cf"; then
                [ -n "$ntp_restart_cmd" ] && eval $ntp_restart_cmd
        fi
}

add_ntp_conf()
{
        local cf="$ntp_conf_dir/$ifname" x=

        [ -e "$cf" ] && rm "$cf"
        [ -d "$ntp_conf_dir" ] || mkdir -p "$ntp_conf_dir"
        if [ -n "$new_ntp_servers" ]; then
                for x in $new_ntp_servers; do
                        echo "server $x" >> "$cf"
                done
        fi
        build_ntp_conf
}

remove_ntp_conf()
{
        if [ -e "$ntp_conf_dir/$ifname" ]; then
                rm "$ntp_conf_dir/$ifname"
        fi
        build_ntp_conf
}

# For ease of use, map DHCP6 names onto our DHCP4 names
case "$reason" in
BOUND6|RENEW6|REBIND6|REBOOT6|INFORM6)
        new_ntp_servers="$new_dhcp6_sntp_servers"
;;
esac

if $if_up; then
        add_ntp_conf add
elif $if_down; then
        remove_ntp_conf del
fi