Cache current working directory to speed up Rubocopsh-cache-rubocop-cwd

This saves thousands of getcwd() system calls and improves the
performance of running Rubocop, which is also used by HAML linting.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/61383

2 files changed, 5 insertions, 3 deletions

diff --git a/rubocop/qa_helpers.rb b/rubocop/qa_helpers.rb
index f4adf7f4e9f..95875d64727 100644
--- a/rubocop/qa_helpers.rb
+++ b/rubocop/qa_helpers.rb
@@ -5,7 +5,7 @@ module RuboCop
     def in_qa_file?(node)
       path = node.location.expression.source_buffer.name
 
-      path.start_with?(File.join(Dir.pwd, 'qa'))
+      path.start_with?(File.join(RuboCop::PathUtil.pwd, 'qa'))
     end
   end
 end
diff --git a/rubocop/spec_helpers.rb b/rubocop/spec_helpers.rb
index 63c1b975a65..ecd77c4351d 100644
--- a/rubocop/spec_helpers.rb
+++ b/rubocop/spec_helpers.rb
@@ -6,14 +6,16 @@ module RuboCop
     # Returns true if the given node originated from the spec directory.
     def in_spec?(node)
       path = node.location.expression.source_buffer.name
+      pwd = RuboCop::PathUtil.pwd
 
       !SPEC_HELPERS.include?(File.basename(path)) &&
-        path.start_with?(File.join(Dir.pwd, 'spec'), File.join(Dir.pwd, 'ee', 'spec'))
+        path.start_with?(File.join(pwd, 'spec'), File.join(pwd, 'ee', 'spec'))
     end
 
     def migration_directories
       @migration_directories ||= MIGRATION_SPEC_DIRECTORIES.map do |dir|
-        [File.join(Dir.pwd, dir), File.join(Dir.pwd, 'ee', dir)]
+        pwd = RuboCop::PathUtil.pwd
+        [File.join(pwd, dir), File.join(pwd, 'ee', dir)]
       end.flatten
     end