Issue 4234 - New discourse module based on docker

modules/discourse_docker/manifests/init.pp

+class discourse_docker(
+  $domain,

[f.lopez, 2017/01/03 20:22:45]

we need to set default values for these variables, for example:

$domain = hiera('discourse_docker::domain', 'undef')

I'm not sure if $domain makes sense but the other absolutely does, so in this
way we make them compatible with hiera as well

+  $certificate,
+  $private_key,

[f.lopez, 2017/01/03 20:22:45]

we might want to add a $ensure variable so we can also make it "absent"

+  $site_settings,
+  $is_default = false,
+  $admins = hiera('discourse_docker::admins', [])
+) {
+
+  apt::source {'docker':
+    before => Package['docker-engine'],
+    location => 'https://apt.dockerproject.org/repo',
+    release => downcase("$::osfamily-$::lsbdistcodename"),
+    include_src => false,
+    key => '58118E89F3A912897C070ADBF76221572C52609D',
+    key_server => 'hkp://ha.pool.sks-keyservers.net:80',
+  }
+
+  package {'git':
+    ensure => present,
+  }
+

[f.lopez, 2017/01/03 20:22:45]

for these packages we can use the `ensure_resource` function from the stdlib
module so we can send them via hiera as well, just like adblockplus or fail2ban
module does.

+  package {'docker-engine':
+    ensure => 'present',
+    require => Apt::Source['docker'],
+  }
+
+  service {'docker':
+    ensure => running,
+    require => Package['docker-engine'],
+  }
+
+  file {'/var/discourse':
+    ensure => directory,
+    mode => 755,
+    owner => root,
+    group => root
+  }
+
+  exec {'fetch-discourse-docker':
+    command => "git clone https://github.com/discourse/discourse_docker.git /var/discourse",
+    path => ["/usr/bin/", "/bin/"],
+    user => root,
+    timeout => 0,
+    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_docker/app.yml.erb'),
+    require => Package['docker-engine'],
+  }
+
+  exec {'rebuild':
+    command => '/var/discourse/launcher rebuild app --skip-prereqs',
+    user => root,
+    subscribe => File['/var/discourse/containers/app.yml'],
+    refreshonly => true,
+    logoutput => 'on_failure',
+    timeout => 0,
+    require => [Exec['fetch-discourse-docker'],
+                Service['docker'],
+                Package['git']],
+  }
+
+  exec {'start':
+    command => '/var/discourse/launcher start app --skip-prereqs',
+    user => root,
+    logoutput => 'on_failure',
+    require => Exec['rebuild'],
+  }

[f.lopez, 2017/01/03 20:22:45]

this can be inside a conditional from `service {'docker':` to here since these
steps are only executed if the resource is present, otherwise it will fail (we
need a $present variable)

+
+  class {'nginx':
+    worker_connections => 500
+  }
+
+  nginx::hostconfig {$domain:
+    source => 'puppet:///modules/discourse_docker/site.conf',
+    is_default => $is_default,
+    certificate => $certificate,
+    private_key => $private_key,
+    log => 'access_log_intraforum'
+  }
+}