1 files changed, 67 insertions, 0 deletions
diff --git a/lib/terraform_working_directory.rb b/lib/terraform_working_directory.rb
new file mode 100644
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+++ b/lib/terraform_working_directory.rb
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+# GOV.UK Mini Environment Admin
+# Copyright © 2018  Christopher Baines <mail@cbaines.net>
+#
+# This file is part of the GOV.UK Mini Environment Admin.
+#
+# The GOV.UK Mini Environment Admin is free software: you can
+# redistribute it and/or modify it under the terms of the GNU Affero
+# General Public License as published by the Free Software Foundation,
+# either version 3 of the License, or (at your option) any later
+# version.
+#
+# The GOV.UK Mini Environment Admin is distributed in the hope that it
+# will be useful, but WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public
+# License along with the GOV.UK Mini Environment Admin.  If not, see
+# <http://www.gnu.org/licenses/>.
+
+require 'fileutils'
+
+class TerraformWorkingDirectory
+  def initialize(id, source)
+    @id = id
+    @source = source
+  end
+
+  def working_directory
+    "tmp/terraform-working-directories/#{@id}"
+  end
+
+  def within_working_directory
+    source = File.expand_path(@source)
+    FileUtils.mkdir_p working_directory
+
+    Dir.chdir(working_directory) do
+      if Dir.empty?('.')
+        RubyTerraform.init(
+          backend: true,
+          from_module: source,
+          backend_config: {
+            address: terraform_backend_address
+          },
+          plugin_dir: terraform_plugin_dir
+        )
+      end
+
+      yield
+    end
+  end
+
+  def terraform_backend_address
+    (
+      'http://localhost:3000' +
+      Rails
+        .application
+        .routes
+        .url_helpers
+        .terraform_http_backend_path(@id)
+    )
+  end
+
+  def terraform_plugin_dir
+    ENV['PATH'].split(':').first
+  end
+end