Delegate initialization to Runner::Strategy

config/application.rb

@@ -49,6 +49,9 @@ module CodeOcean
     config.after_initialize do
       # Initialize the counters according to the db
       Prometheus::Controller.initialize_metrics
+
+      # Initialize the runner environment
+      Runner.strategy_class.initialize_environment
     end
   end
 end

config/initializers/docker.rb

@@ -1,5 +0,0 @@
-# frozen_string_literal: true
-
-require 'docker_client'
-
-DockerClient.initialize_environment unless Rails.env.test? && `which docker`.blank?

lib/runner/strategy.rb

@@ -9,6 +9,10 @@ class Runner::Strategy
     raise NotImplementedError
   end
 
+  def self.initialize_environment
+    raise NotImplementedError
+  end
+
   def self.available_images
     raise NotImplementedError
   end

lib/runner/strategy/docker_container_pool.rb

@@ -8,6 +8,10 @@ class Runner::Strategy::DockerContainerPool < Runner::Strategy
     @config ||= CodeOcean::Config.new(:docker).read(erb: true)
   end
 
+  def self.initialize_environment
+    DockerClient.initialize_environment unless Rails.env.test? && `which docker`.blank?
+  end
+
   def self.available_images
     DockerClient.check_availability!
     DockerClient.image_tags

lib/runner/strategy/poseidon.rb

@@ -13,6 +13,11 @@ class Runner::Strategy::Poseidon < Runner::Strategy
     @config ||= CodeOcean::Config.new(:code_ocean).read[:runner_management] || {}
   end
 
+  def self.initialize_environment
+    # There is no additional initialization required for Poseidon
+    nil
+  end
+
   def self.available_images
     # Images are pulled when needed for a new execution environment
     # and cleaned up automatically if no longer in use.