From 358cdccfa8fba8d446543b7347f89098d904e136 Mon Sep 17 00:00:00 2001
From: Christopher Baines <mail@cbaines.net>
Date: Thu, 5 Jul 2018 11:48:42 +0100
Subject: Only show available backends on the setup page

---
 app/models/backends/terraform_aws.rb     | 4 ++++
 app/models/backends/terraform_libvirt.rb | 4 ++++
 app/views/setup/show.html.erb            | 2 +-
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/app/models/backends/terraform_aws.rb b/app/models/backends/terraform_aws.rb
index 65ca68c..d3d56d1 100644
--- a/app/models/backends/terraform_aws.rb
+++ b/app/models/backends/terraform_aws.rb
@@ -50,6 +50,10 @@ class Backends::TerraformAws < ApplicationRecord
     'Amazon Web Services'
   end
 
+  def self.available?
+    File.exist? "#{ENV['PATH'].split(':').first}/terraform-provider-aws"
+  end
+
   def type_and_id
     "#{self.class.name}=#{id}"
   end
diff --git a/app/models/backends/terraform_libvirt.rb b/app/models/backends/terraform_libvirt.rb
index b8bdf13..bbc872a 100644
--- a/app/models/backends/terraform_libvirt.rb
+++ b/app/models/backends/terraform_libvirt.rb
@@ -44,6 +44,10 @@ class Backends::TerraformLibvirt < ApplicationRecord
     'libvirt'
   end
 
+  def self.available?
+    File.exist? "#{ENV['PATH'].split(':').first}/terraform-provider-libvirts"
+  end
+
   def type_and_id
     "#{self.class.name}=#{id}"
   end
diff --git a/app/views/setup/show.html.erb b/app/views/setup/show.html.erb
index c3ed3b8..cc1d094 100644
--- a/app/views/setup/show.html.erb
+++ b/app/views/setup/show.html.erb
@@ -24,7 +24,7 @@ License along with the GOV.UK Mini Environment Admin.  If not, see
 
 <h1>Backends</h1>
 
-<% Backends.classes.each do |backend_class| %>
+<% Backends.classes.select(&:available?).each do |backend_class| %>
   <div class="panel panel-default">
     <!-- Default panel contents -->
     <div class="panel-heading">
-- 
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