feat(db): added postgis driver

Resolves ajgon#165

docs/source/attributes.rst

@@ -168,7 +168,7 @@ database
 
 -  ``app['database']['adapter']``
 
-  -  **Supported values:** ``mariadb``, ``mysql``, ``postgresql``, ``sqlite3``, ``null``
+  -  **Supported values:** ``mariadb``, ``mysql``, ``postgis``, ``postgresql``, ``sqlite3``, ``null``
   -  **Default:** ``sqlite3``
   -  ActiveRecord adapter which will be used for database connection. ``null`` means
      that no database will be configured, and is currently only tested with the ``rails``

libraries/drivers_db_postgis.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+module Drivers
+  module Db
+    class Postgis < Base
+      adapter :postgis
+      allowed_engines :postgis
+      packages debian: %w[libpq-dev libgeos-dev], rhel: %w[postgresql96-devel libgeos-devel]
+    end
+  end
+end

spec/unit/recipes/configure_spec.rb

@@ -827,10 +827,17 @@
     end
   end
 
-  context 'Postgres + Passenger + Apache2' do
+  context 'Postgres (postgis) + Passenger + Apache2' do
     let(:chef_runner) do
       ChefSpec::SoloRunner.new(platform: 'ubuntu', version: '14.04') do |solo_node|
         deploy = node['deploy']
+        deploy['dummy_project']['database'] = {
+          'adapter' => 'postgis',
+          'username' => 'dbuser',
+          'password' => '03c1bc98cdd5eb2f9c75',
+          'host' => 'dummy-project.c298jfowejf.us-west-2.rds.amazon.com',
+          'port' => 3265
+        }
         deploy['dummy_project']['appserver']['adapter'] = 'passenger'
         deploy['dummy_project']['appserver']['max_pool_size'] = 10
         deploy['dummy_project']['appserver']['min_instances'] = 5
@@ -842,6 +849,19 @@
     end
     let(:chef_run) { chef_runner.converge(described_recipe) }
 
+    before do
+      stub_search(:aws_opsworks_rds_db_instance, '*:*').and_return([])
+    end
+
+    it 'creates proper database.yml template' do
+      db_config = Drivers::Db::Postgis.new(chef_run, aws_opsworks_app).out
+      expect(db_config[:adapter]).to eq 'postgis'
+      expect(chef_run)
+        .to render_file("/srv/www/#{aws_opsworks_app['shortname']}/shared/config/database.yml").with_content(
+          JSON.parse({ development: db_config, production: db_config }.to_json).to_yaml
+        )
+    end
+
     it 'creates apache2 passenger config' do
       expect(chef_run)
         .to render_file("/etc/apache2/sites-available/#{aws_opsworks_app['shortname']}.conf")