Make write_cfg more friendly to a symlinked lacuna.yml

lib/Games/Lacuna/Client.pm

@@ -4,6 +4,7 @@ use strict;
 use warnings;
 use Carp 'croak';
 use File::Temp qw( tempfile );
+use Cwd        qw( abs_path );
 
 our $VERSION = '0.01';
 use constant DEBUG => 1;
@@ -156,6 +157,9 @@ sub write_cfg {
   eval {
     my $target = $self->cfg_file();
 
+    # preserve symlinks: operate directly at destination
+    $target = abs_path $target;
+
     # save data to a temporary, so we don't risk trashing the target
     my ($tfh, $tempfile) = tempfile("$target.XXXXXXX"); # croaks on err
     print {$tfh} $yml or die $!;