Plugins » Foreman Remote Execution

When defining remote_execution_ssh_keys in global parameters, and including the default remote_execution_ssh_keys snippet in a finish template, I am getting the following error:

2016-05-02T11:31:36 [app] [I] Started GET "/unattended/finish?token=2ca0b3c7-d5a1-450b-b0ee-81421d40b166" for 10.69.12.208 at 2016-05-02 11:31:36 +0200
2016-05-02T11:31:36 [app] [I] Processing by UnattendedController#host_template as */*
2016-05-02T11:31:36 [app] [I]   Parameters: {"token"=>"2ca0b3c7-d5a1-450b-b0ee-81421d40b166", "kind"=>"finish"}
2016-05-02T11:31:36 [app] [I] Found dockertest1604.dev.int
2016-05-02T11:31:36 [app] [I]   Rendered inline template (173.3ms)
2016-05-02T11:31:36 [app] [W] There was an error rendering the Preseed default finish template: 
 | ActionView::Template::Error: The snippet 'remote_execution_ssh_keys' threw an error: undefined method 'join' for String::Jail (String)
 | /usr/share/foreman/lib/foreman/renderer.rb:75:in `rescue in snippet'
 | /usr/share/foreman/lib/foreman/renderer.rb:72:in `snippet'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/safemode-1.2.4/lib/safemode/scope.rb:37:in `method_missing'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/safemode-1.2.4/lib/safemode.rb:119:in `bind'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/safemode-1.2.4/lib/safemode.rb:51:in `eval'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/safemode-1.2.4/lib/safemode.rb:51:in `eval'
 | /usr/share/foreman/lib/foreman/renderer.rb:16:in `render_safe'
 | /usr/share/foreman/lib/foreman/renderer.rb:103:in `unattended_render'
 | inline template:1:in `_e9f11054da39b28c624a02c1f30789a2'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionview-4.1.14.2/lib/action_view/template.rb:145:in `block in render'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/notifications.rb:161:in `instrument'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionview-4.1.14.2/lib/action_view/template.rb:339:in `instrument'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionview-4.1.14.2/lib/action_view/template.rb:143:in `render'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/deface-1.0.2/lib/deface/action_view_extensions.rb:41:in `render'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionview-4.1.14.2/lib/action_view/renderer/template_renderer.rb:55:in `block (2 levels) in render_template'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionview-4.1.14.2/lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/notifications.rb:159:in `block in instrument'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/notifications.rb:159:in `instrument'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionview-4.1.14.2/lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionview-4.1.14.2/lib/action_view/renderer/template_renderer.rb:54:in `block in render_template'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionview-4.1.14.2/lib/action_view/renderer/template_renderer.rb:62:in `render_with_layout'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionview-4.1.14.2/lib/action_view/renderer/template_renderer.rb:53:in `render_template'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionview-4.1.14.2/lib/action_view/renderer/template_renderer.rb:17:in `render'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionview-4.1.14.2/lib/action_view/renderer/renderer.rb:46:in `render_template'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionview-4.1.14.2/lib/action_view/renderer/renderer.rb:27:in `render'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionview-4.1.14.2/lib/action_view/rendering.rb:99:in `_render_template'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal/streaming.rb:217:in `_render_template'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionview-4.1.14.2/lib/action_view/rendering.rb:82:in `render_to_body'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal/rendering.rb:32:in `render_to_body'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal/renderers.rb:32:in `render_to_body'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/abstract_controller/rendering.rb:25:in `render'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal/rendering.rb:16:in `render'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal/instrumentation.rb:44:in `block (2 levels) in render'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/core_ext/benchmark.rb:12:in `block in ms'
 | /usr/lib/ruby/2.0.0/benchmark.rb:296:in `realtime'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/core_ext/benchmark.rb:12:in `ms'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal/instrumentation.rb:44:in `block in render'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal/instrumentation.rb:87:in `cleanup_view_runtime'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activerecord-4.1.14.2/lib/active_record/railties/controller_runtime.rb:25:in `cleanup_view_runtime'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal/instrumentation.rb:43:in `render'
 | /usr/share/foreman/app/controllers/unattended_controller.rb:209:in `safe_render'
 | /usr/share/foreman/app/controllers/unattended_controller.rb:66:in `render_template'
 | /usr/share/foreman/app/controllers/unattended_controller.rb:48:in `host_template'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal/implicit_render.rb:4:in `send_action'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/abstract_controller/base.rb:189:in `process_action'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal/rendering.rb:10:in `process_action'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/abstract_controller/callbacks.rb:20:in `block in process_action'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:113:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:113:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:552:in `block (2 levels) in compile'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:502:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:502:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:495:in `block (2 levels) in around'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:306:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:306:in `block (2 levels) in halting'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/rails-observers-0.1.2/lib/rails/observers/action_controller/caching/sweeping.rb:73:in `around'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:452:in `public_send'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:452:in `block in make_lambda'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:305:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:305:in `block in halting'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:494:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:494:in `block in around'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:502:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:502:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:495:in `block (2 levels) in around'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:306:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:306:in `block (2 levels) in halting'
 | /usr/share/foreman/app/controllers/concerns/application_shared.rb:13:in `set_timezone'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:429:in `block in make_lambda'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:305:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:305:in `block in halting'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:494:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:494:in `block in around'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:502:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:502:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:495:in `block (2 levels) in around'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:306:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:306:in `block (2 levels) in halting'
 | /usr/share/foreman/app/models/concerns/foreman/thread_session.rb:32:in `clear_thread'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:429:in `block in make_lambda'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:305:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:305:in `block in halting'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:494:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:494:in `block in around'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:502:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:502:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:495:in `block (2 levels) in around'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:306:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:306:in `block (2 levels) in halting'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/rails-observers-0.1.2/lib/rails/observers/action_controller/caching/sweeping.rb:73:in `around'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:452:in `public_send'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:452:in `block in make_lambda'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:305:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:305:in `block in halting'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:494:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:494:in `block in around'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:502:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:502:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:86:in `run_callbacks'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/abstract_controller/callbacks.rb:19:in `process_action'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal/rescue.rb:29:in `process_action'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/notifications.rb:159:in `block in instrument'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/notifications.rb:159:in `instrument'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal/instrumentation.rb:30:in `process_action'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activerecord-4.1.14.2/lib/active_record/railties/controller_runtime.rb:18:in `process_action'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/abstract_controller/base.rb:136:in `process'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionview-4.1.14.2/lib/action_view/rendering.rb:30:in `process'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal.rb:196:in `dispatch'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_controller/metal.rb:232:in `block in action'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/routing/route_set.rb:80:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/routing/route_set.rb:80:in `dispatch'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/routing/route_set.rb:48:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/journey/router.rb:73:in `block in call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/journey/router.rb:59:in `each'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/journey/router.rb:59:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/routing/route_set.rb:690:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/apipie-rails-0.3.6/lib/apipie/static_dispatcher.rb:65:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/apipie-rails-0.3.6/lib/apipie/extractor/recorder.rb:132:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/apipie-rails-0.3.6/lib/apipie/middleware/checksum_in_headers.rb:27:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/rack-1.5.5/lib/rack/etag.rb:23:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/rack-1.5.5/lib/rack/conditionalget.rb:25:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/rack-1.5.5/lib/rack/head.rb:11:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/middleware/params_parser.rb:27:in `call'
 | /usr/share/foreman/lib/middleware/catch_json_parse_errors.rb:9:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/middleware/flash.rb:254:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/rack-1.5.5/lib/rack/session/abstract/id.rb:225:in `context'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/rack-1.5.5/lib/rack/session/abstract/id.rb:220:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/middleware/cookies.rb:562:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activerecord-4.1.14.2/lib/active_record/query_cache.rb:36:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activerecord-4.1.14.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/callbacks.rb:82:in `run_callbacks'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/middleware/callbacks.rb:27:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/railties-4.1.14.2/lib/rails/rack/logger.rb:38:in `call_app'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/railties-4.1.14.2/lib/rails/rack/logger.rb:22:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/middleware/request_id.rb:21:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/rack-1.5.5/lib/rack/methodoverride.rb:21:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/rack-1.5.5/lib/rack/runtime.rb:17:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/activesupport-4.1.14.2/lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/actionpack-4.1.14.2/lib/action_dispatch/middleware/static.rb:84:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/rack-1.5.5/lib/rack/sendfile.rb:112:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/railties-4.1.14.2/lib/rails/engine.rb:514:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/railties-4.1.14.2/lib/rails/application.rb:144:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/railties-4.1.14.2/lib/rails/railtie.rb:194:in `public_send'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/railties-4.1.14.2/lib/rails/railtie.rb:194:in `method_missing'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/rack-1.5.5/lib/rack/builder.rb:138:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/rack-1.5.5/lib/rack/urlmap.rb:65:in `block in call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/rack-1.5.5/lib/rack/urlmap.rb:50:in `each'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/rack-1.5.5/lib/rack/urlmap.rb:50:in `call'
 | /usr/lib/ruby/vendor_ruby/phusion_passenger/rack/thread_handler_extension.rb:77:in `process_request'
 | /usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:142:in `accept_and_process_next_request'
 | /usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler/thread_handler.rb:110:in `main_loop'
 | /usr/lib/ruby/vendor_ruby/phusion_passenger/request_handler.rb:448:in `block (3 levels) in start_threads'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/logging-2.1.0/lib/logging/diagnostic_context.rb:450:in `call'
 | /usr/share/foreman/vendor/ruby/2.0.0/gems/logging-2.1.0/lib/logging/diagnostic_context.rb:450:in `block in create_with_logging_context'
2016-05-02T11:31:36 [app] [I]   Rendered text template (0.0ms)
2016-05-02T11:31:36 [app] [I] Completed 500 Internal Server Error in 184ms (Views: 0.4ms | ActiveRecord: 2.7ms)

stijn@wgg007:/tmp$ curl http://172.24.1.13/unattended/finish?token=2ca0b3c7-d5a1-450b-b0ee-81421d40b166
There was an error rendering the Preseed default finish template: The snippet 'remote_execution_ssh_keys' threw an error: undefined method 'join' for String::Jail (String)

Simply removing the join solves this problem for me.