Disable hooks by setting an ENV var

Prior to this change, the hooks directory got cleared. That works, but
is not the way to go about it as there's a better way. Setting the env
var this commits sets.

scripts/gitaly_test.rb

@@ -23,7 +23,10 @@ module GitalyTest
       'BUNDLE_FLAGS' => "--jobs=4 --retry=3",
       'BUNDLE_INSTALL_FLAGS' => nil,
       'BUNDLE_GEMFILE' => gemfile,
-      'RUBYOPT' => nil
+      'RUBYOPT' => nil,
+
+      # Git hooks can't run during tests as the internal API is not running.
+      'GITALY_TESTING_NO_GIT_HOOKS' => "1"
     }
 
     if ENV['CI']

spec/support/helpers/test_env.rb

@@ -146,19 +146,6 @@ module TestEnv
       install_dir: Gitlab.config.gitlab_shell.path,
       version: Gitlab::Shell.version_required,
       task: 'gitlab:shell:install')
-
-    # gitlab-shell hooks don't work in our test environment because they try to make internal API calls
-    sabotage_gitlab_shell_hooks
-  end
-
-  def sabotage_gitlab_shell_hooks
-    create_fake_git_hooks(Gitlab::Shell.new.hooks_path)
-  end
-
-  def create_fake_git_hooks(hooks_dir)
-    %w[pre-receive post-receive update].each do |hook|
-      File.open(File.join(hooks_dir, hook), 'w', 0755) { |f| f.puts '#!/bin/sh' }
-    end
   end
 
   def setup_gitaly
@@ -172,7 +159,6 @@ module TestEnv
       task: "gitlab:gitaly:install[#{install_gitaly_args}]") do
 
         Gitlab::SetupHelper.create_gitaly_configuration(gitaly_dir, { 'default' => repos_path }, force: true)
-        create_fake_git_hooks(File.join(gitaly_dir, 'ruby/git-hooks'))
         start_gitaly(gitaly_dir)
       end
   end