Check that there's no traefik hooks left behind

lib/kamal/configuration.rb

@@ -70,6 +70,7 @@ class Kamal::Configuration
     ensure_valid_kamal_version
     ensure_retain_containers_valid
     ensure_valid_service_name
+    ensure_no_traefik_reboot_hooks
   end
 
 
@@ -303,6 +304,16 @@ class Kamal::Configuration
       true
     end
 
+    def ensure_no_traefik_reboot_hooks
+      hooks = %w[ pre-traefik-reboot post-traefik-reboot ].select { |hook_file| File.exist?(File.join(hooks_path, hook_file)) }
+
+      if hooks.any?
+        raise Kamal::ConfigurationError, "Found #{hooks.join(", ")}, these should be renamed to (pre|post)-proxy-reboot"
+      end
+
+      true
+    end
+
 
     def role_names
       raw_config.servers.is_a?(Array) ? [ "web" ] : raw_config.servers.keys.sort

lib/kamal/configuration/validator/proxy.rb

@@ -2,7 +2,7 @@ class Kamal::Configuration::Validator::Proxy < Kamal::Configuration::Validator
   def validate!
     super
 
-    if config["host"].blank? && config["ssl"]
+    if config["hosts"].blank? && config["ssl"]
       error "Must set a host to enable automatic SSL"
     end
   end

test/configuration/proxy_test.rb

@@ -9,7 +9,7 @@ class ConfigurationEnvTest < ActiveSupport::TestCase
   end
 
   test "ssl with host" do
-    @deploy[:proxy] = { "ssl" => true, "host" => "example.com" }
+    @deploy[:proxy] = { "ssl" => true, "hosts" => [ "example.com" ] }
     assert_equal true, config.proxy.ssl?
   end
 

test/configuration_test.rb

@@ -342,4 +342,18 @@ class ConfigurationTest < ActiveSupport::TestCase
     assert_equal config.role(:web_tokyo).running_proxy?, true
     assert_equal config.role(:web_chicago).running_proxy?, true
   end
+
+  test "traefik hooks raise error" do
+    Dir.mktmpdir do |dir|
+      Dir.chdir(dir) do
+        FileUtils.mkdir_p ".kamal/hooks"
+        FileUtils.touch ".kamal/hooks/post-traefik-reboot"
+        FileUtils.touch ".kamal/hooks/pre-traefik-reboot"
+        exception = assert_raises(Kamal::ConfigurationError) do
+          Kamal::Configuration.new(@deploy)
+        end
+        assert_equal "Found pre-traefik-reboot, post-traefik-reboot, these should be renamed to (pre|post)-proxy-reboot", exception.message
+      end
+    end
+  end
 end