Adding note about Puppet 3 support (voxpupuli#153)

* Adding deprecation warning
* First steps towards the work in voxpupuli#152

README.md

@@ -138,6 +138,18 @@ Test against a specific Puppet or Facter version:
     $ PUPPET_VERSION=4.10.0 bundle update && bundle exec rake spec
     $ FACTER_VERSION=1.6.8  bundle update && bundle exec rake spec
 
+## Puppet 3 Support
+
+Puppet 3 is EOL as-of January 2017. The last release of this module that will
+support Puppet 3.X and earlier will be the 3.X.X module releases.
+
+Module versions from 4.X.X onwards will use Puppet 4 only features and will not work with
+earlier versions.
+
+We would recommend upgrading your Puppet agent to the latest release, as Puppet 4 comes with a load of awesome new features.
+
+If you're stuck with older Puppet, you could also fork the module from 3.0.0 and use your fork as a Puppet 3 supported version.
+
 ## Contributing
 
 * Fork it

manifests/init.pp

@@ -240,6 +240,10 @@
     ~> Class['redis::service']
   }
 
+  if $::puppetversion and versioncmp($::puppetversion, '4.0.0') < 0 {
+    warning("Puppet 3 is EOL as of 01/01/2017, The 3.X.X releases of the module are the last that will support Puppet 3\nFor more information, see https://github.com/arioch/puppet-redis#puppet-3-support")
+  }
+
   # Sanity check
   if $::redis::slaveof {
     if $::redis::bind =~ /^127.0.0./ {

spec/spec_helper.rb

@@ -81,6 +81,7 @@ def centos_facts
   {
     :operatingsystem => 'CentOS',
     :osfamily        => 'RedHat',
+    :puppetversion   => '4.5.2',
   }
 end
 
@@ -89,13 +90,15 @@ def debian_facts
     :operatingsystem           => 'Debian',
     :osfamily                  => 'Debian',
     :operatingsystemmajrelease => '8',
+    :puppetversion             => '4.5.2',
   }
 end
 
 def freebsd_facts
   {
     :operatingsystem => 'FreeBSD',
     :osfamily        => 'FreeBSD',
+    :puppetversion   => '4.5.2',
   }
 end
 
@@ -104,6 +107,7 @@ def centos_6_facts
     :operatingsystem => 'CentOS',
     :osfamily        => 'RedHat',
     :operatingsystemmajrelease => '6',
+    :puppetversion   => '4.5.2',
   }
 end
 
@@ -112,13 +116,15 @@ def ubuntu_1404_facts
     :operatingsystem           => 'Ubuntu',
     :osfamily                  => 'Debian',
     :operatingsystemmajrelease => '14.04',
+    :puppetversion             => '4.5.2'
   }
 end
 
 def archlinux_facts
   {
     :operatingsystem => 'Archlinux',
     :osfamily        => 'Archlinux',
+    :puppetversion   => '4.5.2',
   }
 end