transferred Code Ocean from original repository to GitHub

app/models/execution_environment.rb

@@ -0,0 +1,42 @@
+class ExecutionEnvironment < ActiveRecord::Base
+  include Creation
+
+  VALIDATION_COMMAND = 'whoami'
+
+  has_many :exercises
+  has_many :hints
+
+  scope :with_exercises, -> { where('id IN (SELECT execution_environment_id FROM exercises)') }
+
+  validate :valid_test_setup?
+  validate :working_docker_image?, if: :validate_docker_image?
+  validates :docker_image, presence: true
+  validates :name, presence: true
+  validates :permitted_execution_time, numericality: {only_integer: true}, presence: true
+  validates :run_command, presence: true
+
+  def to_s
+    name
+  end
+
+  def valid_test_setup?
+    if test_command? ^ testing_framework?
+      errors.add(:test_command, I18n.t('activerecord.errors.messages.together', attribute: I18n.t('activerecord.attributes.execution_environment.testing_framework')))
+    end
+  end
+  private :valid_test_setup?
+
+  def validate_docker_image?
+    docker_image.present? && Rails.env != 'test'
+  end
+  private :validate_docker_image?
+
+  def working_docker_image?
+    DockerClient.pull(docker_image) unless DockerClient.image_tags.include?(docker_image)
+    output = DockerClient.new(execution_environment: self).execute_command(VALIDATION_COMMAND)
+    errors.add(:docker_image, "error: #{output[:stderr]}") if output[:stderr].present?
+  rescue DockerClient::Error => error
+    errors.add(:docker_image, "error: #{error}")
+  end
+  private :working_docker_image?
+end