simplify and fix default values

REFERENCE.md

@@ -110,7 +110,7 @@ Data type: `Any`
 The group that will own the corresponding home directory in the jail,
 giving the user a place to land. Also sets group ownership for `/incoming`.
 
-Default value: ``undef``
+Default value: `$user`
 
 ##### <a name="match_group"></a>`match_group`
 
@@ -119,7 +119,7 @@ Data type: `Any`
 Set the group that SSHd will look for when redirecting users to the jail.
 Useful for shared jails. Defaults to the value of `group`.
 
-Default value: ``undef``
+Default value: `$group`
 
 ##### <a name="password_authentication"></a>`password_authentication`
 

manifests/jail.pp

@@ -52,24 +52,13 @@
 define sftp_jail::jail (
   $jail_name               = $name,
   $user                    = undef,
-  $group                   = undef,
-  $match_group             = undef,
+  $group                   = $user,
+  $match_group             = $group,
   $password_authentication = 'no',
 ) {
   include sftp_jail
   $jail_base = "${sftp_jail::chroot_base}/${jail_name}"
 
-  if ($match_group) {
-    $ssh_match_group = $match_group
-  }
-  else {
-    $ssh_match_group = $group
-  }
-
-  if !($group) {
-    $group = $user
-  }
-
   file { [$jail_base, "${jail_base}/home"]:
     ensure => 'directory',
     owner  => 'root',
@@ -91,7 +80,7 @@
     mode   => '0755',
   }
 
-  ssh::server::match_block { $ssh_match_group:
+  ssh::server::match_block { $match_group:
     type    => 'Group',
     options => {
       'ChrootDirectory'        => $jail_base,