Move common exceptions into errors.rb

lib/errors.rb

+class UnknownError < StandardError; end
+class AccessDeniedError < StandardError; end
+class InvalidRepositoryPathError < StandardError; end
+class DisallowedCommandError < StandardError; end

lib/gitlab_access.rb

+require 'json'
+
+require_relative 'errors'
 require_relative 'gitlab_init'
 require_relative 'gitlab_net'
 require_relative 'gitlab_access_status'
@@ -7,8 +10,6 @@ require_relative 'object_dirs_helper'
 require 'json'
 
 class GitlabAccess
-  class AccessDeniedError < StandardError; end
-
   include NamesHelper
 
   attr_reader :config, :gl_repository, :repo_path, :changes, :protocol

lib/gitlab_shell.rb

@@ -5,9 +5,6 @@ require_relative 'gitlab_net'
 require_relative 'gitlab_metrics'
 
 class GitlabShell # rubocop:disable Metrics/ClassLength
-  class AccessDeniedError < StandardError; end
-  class DisallowedCommandError < StandardError; end
-  class InvalidRepositoryPathError < StandardError; end
 
   GIT_COMMANDS = %w(git-upload-pack git-receive-pack git-upload-archive git-lfs-authenticate).freeze
   GITALY_MIGRATED_COMMANDS = {