Refactor gitlab:import:repos task to remove direct disk access

spec/lib/gitlab/git/tree_spec.rb

 require "spec_helper"
-describe Gitlab::Git::Tree, seed_helper: true do
+describe Gitlab::Git::Tree, :seed_helper do
   let(:repository) { Gitlab::Git::Repository.new('default', TEST_REPO_PATH, '') }
   context :repo do

spec/support/helpers/seed_helper.rb

@@ -101,10 +101,4 @@ bla/bla.txt
       handle.write('# hello'.encode(enc))
     end
   end
-
-  # Prevent developer git configurations from being persisted to test
-  # repositories
-  def git_env
-    { 'GIT_TEMPLATE_DIR' => '' }
-  end
 end

spec/support/helpers/test_env.rb

@@ -243,6 +243,14 @@ module TestEnv
     set_repo_refs(target_repo_path, refs)
   end
+  def create_bare_repository(path)
+    FileUtils.mkdir_p(path)
+
+    system(git_env, *%W(#{Gitlab.config.git.bin_path} -C #{path} init --bare),
+           out: '/dev/null',
+           err: '/dev/null')
+  end
+
   def repos_path
     @repos_path ||= Gitlab.config.repositories.storages[REPOS_STORAGE].legacy_disk_path
   end

spec/support/stored_repositories.rb

 RSpec.configure do |config|
-  config.before(:each, :repository) do
-    TestEnv.clean_test_path
-  end
-
   config.before(:all, :broken_storage) do
     FileUtils.rm_rf Gitlab.config.repositories.storages.broken.legacy_disk_path
   end