Set up an instance of Mastodon for Kosmos

Refs #19

Use new application cookbook, update our cookbooks

cookbooks/postgresql/resources/extension.rb

@@ -0,0 +1,57 @@
+# frozen_string_literal: true
+#
+# Cookbook:: postgresql
+# Resource:: extension
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+include Opscode::PostgresqlHelpers
+
+# name property should take the form:
+# database/extension
+
+property :database, String,
+         required: true,
+         default: lazy { name.scan(%r{\A[^/]+(?=/)}).first }
+
+property :extension, String,
+         required: true,
+         default: lazy { name.scan(%r{(?<=/)[^/]+\Z}).first }
+
+action :create do
+  bash "CREATE EXTENSION #{name}" do
+    code psql("CREATE EXTENSION IF NOT EXISTS \"#{extension}\"")
+    user 'postgres'
+    action :run
+    not_if { extension_installed? }
+  end
+end
+
+action :drop do
+  bash "DROP EXTENSION #{name}" do
+    code psql("DROP EXTENSION IF EXISTS \"#{extension}\"")
+    user 'postgres'
+    action :run
+    only_if { extension_installed? }
+  end
+end
+
+def psql(query)
+  "psql -d #{database} <<< '\\set ON_ERROR_STOP on\n#{query};'"
+end
+
+def extension_installed?
+  query = "SELECT 'installed' FROM pg_extension WHERE extname = '#{extension}';"
+  !(execute_sql(query, database) =~ /^installed$/).nil?
+end