Issue 3996 - Make sure to install current versions of Markdown and Jinja2 modules on web servers

modules/web/manifests/server.pp

Index: modules/web/manifests/server.pp
===================================================================
--- a/modules/web/manifests/server.pp
+++ b/modules/web/manifests/server.pp
@@ -36,17 +36,35 @@ class web::server(
     },
   }
 
   class {'geoip':
     cron => {hour => 0, minute => 8, monthday => 15},
     ensure => $geoip ? {false => 'absent', default => 'present'},
   }
 
-  package {['python-jinja2', 'python-markdown']:}
+  ensure_packages(['python-pip'])
+
+  # Make sure that apt packages corresponding to the pip-installed modules below
+  # won't be installed unintentionally, these will take precedence otherwise.
+  package {['python-jinja2', 'python-markdown']:
+    ensure => 'held',
+  }
+
+  package {'Jinja2':
+    ensure => '2.8',
+    provider => 'pip',
+    require => [Package['python-pip'], Package['python-jinja2']],
+  }
+
+  package {'markdown':
+    ensure => '2.6.6',
+    provider => 'pip',
+    require => [Package['python-pip'], Package['python-markdown']],
+  }
 
   nginx::hostconfig {$vhost:
     content => template('web/site.conf.erb'),
     global_config => template('web/global.conf.erb'),
     is_default => $is_default,
     certificate => $certificate ? {'undef' => undef, default => $certificate},
     private_key => $private_key ? {'undef' => undef, default => $private_key},
     log => "access_log_$vhost"