Add parameter dumpdir.

To be able to specify directory for chrony to save measurement in on exit. When dumpdir is
set, both option dumponexit and dumpdir is added to chrony.conf

dumponexit and dumpdir was before b971db0 hardcoded in
the template for archlinux.  This commit is restoring the default value for Archlinux, and
leaving the default unset on other os.

REFERENCE.md

@@ -507,3 +507,11 @@ This selects interfaces to enable hardware timestamps on. It can be an array of
 or a hash of interfaces to ther respective options.
 
 Default value: []
+
+##### `dumpdir`
+
+Data type: Optional[Stdlib::Unixpath]
+
+Directory for chrony to store measurement in on exit.
+
+Default value: $chrony::params::dumpdir

manifests/init.pp

@@ -177,6 +177,8 @@
 # @param hwtimestamps
 #   This selects interfaces to enable hardware timestamps on. It can be an array of
 #   interfaces or a hash of interfaces to their respective options.
+# @param dumpdir
+#   Directory to store measurement history in on exit.
 class chrony (
   Array[String] $bindcmdaddress                                    = ['127.0.0.1', '::1'],
   Array[String] $cmdacl                                            = $chrony::params::cmdacl,
@@ -229,6 +231,7 @@
   Boolean $rtcsync                                                 = true,
   Boolean $rtconutc                                                = $chrony::params::rtconutc,
   Variant[Hash,Array[String]] $hwtimestamps                        = [],
+  Optional[Stdlib::Unixpath] $dumpdir                              = $chrony::params::dumpdir,
 ) inherits chrony::params {
 
   if ! $config_keys_manage and $chrony_password != 'unset'  {

manifests/params.pp

@@ -14,6 +14,7 @@
       $service_name      = 'chrony'
       $clientlog         = true
       $rtconutc          = true
+      $dumpdir           = '/var/log/chrony'
     }
     'Gentoo' : {
       $package_name      = 'net-misc/chrony'
@@ -26,6 +27,7 @@
       $service_name      = 'chronyd'
       $clientlog         = true
       $rtconutc          = true
+      $dumpdir           = undef
     }
     'Suse', 'RedHat' : {
       $package_name      = 'chrony'
@@ -38,6 +40,7 @@
       $service_name      = 'chronyd'
       $clientlog         = false
       $rtconutc          = false
+      $dumpdir           = undef
     }
     'Debian' : {
       $package_name      = 'chrony'
@@ -50,6 +53,7 @@
       $service_name      = 'chrony'
       $clientlog         = false
       $rtconutc          = false
+      $dumpdir           = undef
     }
 
     default     : {

templates/chrony.conf.epp

@@ -61,6 +61,12 @@ local stratum <%= $chrony::local_stratum %>
 
 keyfile <%= $chrony::config_keys %>
 <% } -%>
+<% if $chrony::dumpdir { -%>
+
+# Save the measurement history for the servers to files on exit.
+dumponexit
+dumpdir <%= $chrony::dumpdir %>
+<% } -%>
 <% if ! $chrony::clientlog { -%>
 
 # Disable logging of client accesses.