contrib/dhcpcd/hooks/50-ntp.conf

   1 # Sample dhcpcd hook script for NTP
   2 # It will configure either one of NTP, OpenNTP or Chrony (in that order)
   3 # and will default to NTP if no default config is found.
   4
   5 # Like our resolv.conf hook script, we store a database of ntp.conf files
   6 # and merge into /etc/ntp.conf
   7
   8 # You can set the env var NTP_CONF to override the derived default on
   9 # systems with >1 NTP client installed.
  10 # Here is an example for OpenNTP
  11 #   dhcpcd -e NTP_CONF=/usr/pkg/etc/ntpd.conf
  12 # or by adding this to /etc/dhcpcd.conf
  13 #   env NTP_CONF=/usr/pkg/etc/ntpd.conf
  14 # or by adding this to /etc/dhcpcd.enter-hook
  15 #   NTP_CONF=/usr/pkg/etc/ntpd.conf
  16 # To use Chrony instead, simply change ntpd.conf to chrony.conf in the
  17 # above examples.
  18
  19 : ${ntp_confs:=ntp.conf ntpd.conf chrony.conf}
  20 : ${ntp_conf_dirs=/etc /usr/pkg/etc /usr/local/etc}
  21 ntp_conf_dir="$state_dir/ntp.conf"
  22
  23 # If NTP_CONF is not set, work out a good default
  24 if [ -z "$NTP_CONF" ]; then
  25         for d in ${ntp_conf_dirs}; do
  26                 for f in ${ntp_confs}; do
  27                         if [ -e "$d/$f" ]; then
  28                                 NTP_CONF="$d/$f"
  29                                 break 2
  30                         fi
  31                 done
  32         done
  33         [ -e "$NTP_CONF" ] || NTP_CONF=/etc/ntp.conf
  34 fi
  35
  36 # Derive service name from configuration
  37 if [ -z "$ntp_service" ]; then
  38         case "$NTP_CONF" in
  39         *chrony.conf)           ntp_service=chronyd;;
  40         *)                      ntp_service=ntpd;;
  41         esac
  42 fi
  43
  44 # Debian has a seperate file for DHCP config to avoid stamping on
  45 # the master.
  46 if [ "$ntp_service" = ntpd ] && type invoke-rc.d >/dev/null 2>&1; then
  47         [ -e /var/lib/ntp ] || mkdir /var/lib/ntp
  48         : ${ntp_service:=ntp}
  49         : ${NTP_DHCP_CONF:=/var/lib/ntp/ntp.conf.dhcp}
  50 fi
  51
  52 : ${ntp_restart_cmd:=service_condcommand $ntp_service restart}
  53
  54 ntp_conf=${NTP_CONF}
  55 NL="
  56 "
  57
  58 build_ntp_conf()
  59 {
  60         cf="$state_dir/ntp.conf.$ifname"
  61
  62         # Build a list of interfaces
  63         interfaces=$(list_interfaces "$ntp_conf_dir")
  64
  65         header=
  66         servers=
  67         if [ -n "$interfaces" ]; then
  68                 # Build the header
  69                 for x in ${interfaces}; do
  70                         header="$header${header:+, }$x"
  71                 done
  72
  73                 # Build a server list
  74                 srvs=$(cd "$ntp_conf_dir";
  75                         key_get_value "server " $interfaces)
  76                 if [ -n "$srvs" ]; then
  77                         for x in $(uniqify $srvs); do
  78                                 servers="${servers}server $x$NL"
  79                         done
  80                 fi
  81         fi
  82
  83         # Merge our config into ntp.conf
  84         [ -e "$cf" ] && rm -f "$cf"
  85         [ -d "$ntp_conf_dir" ] || mkdir -p "$ntp_conf_dir"
  86
  87         if [ -n "$NTP_DHCP_CONF" ]; then
  88                 [ -e "$ntp_conf" ] && cp "$ntp_conf" "$cf"
  89                 ntp_conf="$NTP_DHCP_CONF"
  90         elif [ -e "$ntp_conf" ]; then
  91                 remove_markers "$signature_base" "$signature_base_end" \
  92                         "$ntp_conf" > "$cf"
  93         fi
  94
  95         if [ -n "$servers" ]; then
  96                 echo "$signature_base${header:+ $from }$header" >> "$cf"
  97                 printf %s "$servers" >> "$cf"
  98                 echo "$signature_base_end${header:+ $from }$header" >> "$cf"
  99         else
 100                 [ -e "$ntp_conf" ] && [ -e "$cf" ] || return
 101         fi
 102
 103         # If we changed anything, restart ntpd
 104         if change_file "$ntp_conf" "$cf"; then
 105                 [ -n "$ntp_restart_cmd" ] && eval $ntp_restart_cmd
 106         fi
 107 }
 108
 109 add_ntp_conf()
 110 {
 111         cf="$ntp_conf_dir/$ifname"
 112
 113         [ -e "$cf" ] && rm "$cf"
 114         [ -d "$ntp_conf_dir" ] || mkdir -p "$ntp_conf_dir"
 115         if [ -n "$new_ntp_servers" ]; then
 116                 for x in $new_ntp_servers; do
 117                         echo "server $x" >> "$cf"
 118                 done
 119         fi
 120         build_ntp_conf
 121 }
 122
 123 remove_ntp_conf()
 124 {
 125         if [ -e "$ntp_conf_dir/$ifname" ]; then
 126                 rm "$ntp_conf_dir/$ifname"
 127         fi
 128         build_ntp_conf
 129 }
 130
 131 # For ease of use, map DHCP6 names onto our DHCP4 names
 132 case "$reason" in
 133 BOUND6|RENEW6|REBIND6|REBOOT6|INFORM6)
 134         new_ntp_servers="$new_dhcp6_sntp_servers"
 135 ;;
 136 esac
 137
 138 if $if_up; then
 139         add_ntp_conf
 140 elif $if_down; then
 141         remove_ntp_conf
 142 fi