ntp_server: add class for configuring the NTP server

Configures chrony and gpsd to use the GPS on /dev/ttyS0 and the PPS on
/dev/pps0.

files/chrony/chrony.conf

+# NOTE: This file is managed by the timehost::ntp_server puppet class.
+# Use public NTP servers from the pool.ntp.org project.
+#pool pool.ntp.org iburst
+
+# Backup ntp.se Stockholm servers.
+server sth1.ntp.se
+server sth2.ntp.se
+server sth3.ntp.se
+server sth4.ntp.se
+
+# Record the rate at which the system clock gains/losses time.
+driftfile /var/lib/chrony/drift
+
+# Allow the system clock to be stepped in the first three updates
+# if its offset is larger than 1 second.
+makestep 1.0 3
+
+# Enable kernel synchronization of the real-time clock (RTC).
+rtcsync
+
+bindaddress 130.236.254.17
+bindaddress 2001:6b0:17:f0a0::11
+allow
+
+refclock SHM 0 refid GPS precision 1e-1 offset 0.9999
+refclock SHM 2 refid PPS precision 1e-7

files/gpsd/conf

+# NOTE: This file is managed by the timehost::ntp_server class.
+DEV="/dev/ttyS0 /dev/pps0"
+OPTS="-n"

manifests/ntp_server.pp

+# NTP server configuration.
+class timehost::ntp_server {
+  package {
+    [
+      'chrony',
+      'gpsd',
+    ]:
+      ensure => installed,
+  }
+
+  service { 'gpsd':
+    ensure => running,
+    enable => true,
+  }
+
+  file { '/etc/sv/gpsd/conf':
+    ensure => present,
+    source => 'puppet:///modules/timehost/gpsd/conf',
+    owner  => 'root',
+    group  => 'root',
+    mode   => '0644',
+    notify => Service['gpsd'],
+  }
+
+  service { 'chronyd':
+    ensure => running,
+    enable => true,
+    notify => Service['gpsd'],
+  }
+
+  file { '/etc/chrony.conf':
+    ensure => present,
+    source => 'puppet:///modules/timehost/chrony/chrony.conf',
+    owner  => 'root',
+    group  => 'root',
+    mode   => '0644',
+    notify => Service['chronyd'],
+  }
+}