update sprockets for the Annual Asset Pipeline Breaks Prod festival

Gemfile

@@ -8,7 +8,7 @@ gem "mysql2"
 gem "scenic"
 gem "scenic-mysql_adapter"
 gem "activerecord-typedstore"
-gem "sprockets-rails", "2.3.3"
+gem "sprockets-rails", require: "sprockets/railtie"
 
 # js
 gem "json"

Gemfile.lock

@@ -291,13 +291,13 @@ GEM
     snaky_hash (2.0.1)
       hashie
       version_gem (~> 1.1, >= 1.1.1)
-    sprockets (3.7.2)
+    sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
-      rack (> 1, < 3)
-    sprockets-rails (2.3.3)
-      actionpack (>= 3.0)
-      activesupport (>= 3.0)
-      sprockets (>= 2.8, < 4.0)
+      rack (>= 2.2.4, < 4)
+    sprockets-rails (3.4.2)
+      actionpack (>= 5.2)
+      activesupport (>= 5.2)
+      sprockets (>= 3.0.0)
     stackprof (0.2.25)
     standard (1.31.1)
       language_server-protocol (~> 3.17.0.2)
@@ -378,7 +378,7 @@ DEPENDENCIES
   scenic-mysql_adapter
   simplecov
   sitemap_generator
-  sprockets-rails (= 2.3.3)
+  sprockets-rails
   stackprof
   standard
   standard-performance

app/assets/config/manifest.js

@@ -0,0 +1,5 @@
+//= link_tree ../images
+//= link_tree ../javascripts .js
+//= link_directory ../stylesheets .css
+//= link_tree ../../../vendor/assets/javascripts .js
+//= link_tree ../../../vendor/assets/stylesheets .css

config/application.rb

@@ -14,7 +14,6 @@ require "action_mailer/railtie"
 # require "action_text/engine"
 require "action_view/railtie"
 # require "action_cable/engine"
-require "sprockets/railtie"
 require "rails/test_unit/railtie"
 
 # Require the gems listed in Gemfile, including any gems

config/environments/production.rb

@@ -53,6 +53,11 @@ Rails.application.configure do
   config.logger = Logger.new("/srv/lobste.rs/log/production.log")
   config.log_level = :info
 
+  # I updated sprockets and every page raised 'The asset "application.css" is not present in the
+  # asset pipeline.' And then I turned this on and everything was fine. The asset pipeline continues
+  # to be a fiddly, unreliable mystery.
+  config.assets.unknown_asset_fallback = true
+
   # Prepend all log lines with the following tags.
   config.log_tags = [:request_id]