Issue 4234 - Migrate Discourse to a Docker-based setup

modules/discourse/manifests/init.pp

 class discourse(
     $domain,
     $certificate,
     $private_key,
     $site_settings,
     $is_default = false,
     $admins = hiera('discourse::admins', [])
   ) {
 
   apt::source {'docker':
@@ skipping 20 matching lines @@
   }
 
   file {'/var/discourse':
     ensure => directory,
     mode => 755,
     owner => root,
     group => root
   }
 
   exec {'fetch-discourse-docker':
-    command => "hg clone https://hg.adblockplus.org/discourse_docker /var/discourse",
+    command => "git clone https://github.com/discourse/discourse_docker.git /var/discourse",
     path => ["/usr/bin/", "/bin/"],
     user => root,
     timeout => 0,
-    require => [Package['mercurial'], File['/var/discourse']],
-    onlyif => "test ! -d /var/discourse/.hg"
+    require => [Package['git'], File['/var/discourse']],
+    unless => "test -d /var/discourse/.git"
   }
 
   file {'/var/discourse/containers/app.yml':
     ensure => file,
     mode => 600,
     owner => root,
     group => root,
     content => template('discourse/app.yml.erb'),
     require => Exec['fetch-discourse-docker'],
   }
@@ skipping 22 matching lines @@
   }
 
   nginx::hostconfig {$domain:
     source => 'puppet:///modules/discourse/site.conf',
     is_default => $is_default,
     certificate => $certificate,
     private_key => $private_key,
     log => 'access_log_intraforum'
   }
 }