config: set default database connection settings.

Set sensible defaults for connecting to the database. By default, we try
to connect to the `danbooru2` database running on localhost as the
`danbooru` user. These are the defaults recommended by the install
guide.

If you need to change the database settings, set DATABASE_URL in
.env.local or on the command line:

   # .env.local
   DATABASE_URL=postgresql://danbooru:password@localhost/danbooru2

   # command line
   $ DATABASE_URL=postgresql://danbooru:password@localhost/danbooru2 bin/rails server

This eliminates the need to copy script/install/database.yml.templ to
config/database.yml during installation and during deployment. This is
so that Danbooru works out of the box without extra configuration. In
particular, this is so that we can run Danbooru in a Docker container
without having to set DATABASE_URL.

.gitignore

@@ -3,7 +3,6 @@
 .yarn-integrity
 .gitconfig
 .git/
-config/database.yml
 config/danbooru_local_config.rb
 config/deploy/*.rb
 config/newrelic.yml

INSTALL.debian

@@ -139,7 +139,6 @@ mkdir -p /var/www/danbooru2/shared/data
 mkdir -p /var/www/danbooru2/shared/data/preview
 mkdir -p /var/www/danbooru2/shared/data/sample
 chown -R danbooru:danbooru /var/www/danbooru2
-curl -L -s $GITHUB_INSTALL_SCRIPTS/database.yml.templ -o /var/www/danbooru2/shared/config/database.yml
 curl -L -s $GITHUB_INSTALL_SCRIPTS/danbooru_local_config.rb.templ -o /var/www/danbooru2/shared/config/danbooru_local_config.rb
 
 echo "* Almost done! You are now ready to deploy Danbooru onto this server."

config/database.yml

@@ -0,0 +1,39 @@
+# Don't edit this file. To override this file, set `DATABASE_URL` in .env.local
+# instead. Example:
+#
+#   DATABASE_URL=postgresql://danbooru:password@localhost/danbooru2
+#
+# https://guides.rubyonrails.org/configuring.html#configuring-a-database
+
+default: &default
+  adapter: postgresql
+  username: danbooru
+  host: localhost
+  url: <%= ENV["DATABASE_URL"] %>
+
+production:
+  <<: *default
+  database: danbooru2
+
+development:
+  <<: *default
+  database: danbooru2
+
+test:
+  <<: *default
+  database: danbooru2_test
+
+archive_production:
+  <<: *default
+  database: archive_production
+  url: <%= ENV["ARCHIVE_DATABASE_URL"] %>
+
+archive_development:
+  <<: *default
+  database: archive_development
+  url: <%= ENV["ARCHIVE_DATABASE_URL"] %>
+
+archive_test:
+  <<: *default
+  database: archive_test
+  url: <%= ENV["ARCHIVE_DATABASE_URL"] %>

lib/capistrano/tasks/symlink.rake

@@ -3,7 +3,6 @@ namespace :symlink do
   task :local_files do
     on roles(:app, :worker) do
       execute :ln, "-s", "#{deploy_to}/shared/config/danbooru_local_config.rb", "#{release_path}/config/danbooru_local_config.rb"
-      execute :ln, "-s", "#{deploy_to}/shared/config/database.yml", "#{release_path}/config/database.yml"
       if test("[ -f #{deploy_to}/shared/config/newrelic.yml ]")
         execute :ln, "-s", "#{deploy_to}/shared/config/newrelic.yml", "#{release_path}/config/newrelic.yml"
       end

script/install/database.yml.templ

@@ -1,45 +0,0 @@
-# SQLite version 3.x
-#   gem install sqlite3-ruby (not necessary on OS X Leopard)
-development:
-  adapter: postgresql
-  database: danbooru2
-  pool: 5
-  timeout: 5000
-  url: <%= ENV['DATABASE_URL'] %>
-
-# Warning: The database defined as "test" will be erased and
-# re-generated from your development database when you run "rake".
-# Do not set this db to the same as development or production.
-test:
-  adapter: postgresql
-  database: danbooru2_test
-  pool: 5
-  timeout: 5000
-  url: <%= ENV['DATABASE_URL'] %>
-
-production:
-  adapter: postgresql
-  database: danbooru2
-  pool: 5
-  timeout: 5000
-  url: <%= ENV['DATABASE_URL'] %>
-
-archive_development:
-  adapter: postgresql
-  database: archive_development
-  url: <%= ENV['ARCHIVE_DATABASE_URL'] %>
-
-archive_test:
-  adapter: postgresql
-  database: archive_test
-  url: <%= ENV['ARCHIVE_DATABASE_URL'] %>
-
-archive_production:
-  adapter: postgresql
-  database: archive_development
-  url: <%= ENV['ARCHIVE_DATABASE_URL'] %>
-
-archive_staging:
-  adapter: postgresql
-  database: archive_development
-  url: <%= ENV['ARCHIVE_DATABASE_URL'] %>