Don't move project repository/attachments when using hashed storage

When a project is using hashed storage, the repositories and
attachments wouldn't be saved on disk using the `full_path`. So the
migration would not do anything.

However: best to just skip moving when hashed storage is enabled.

changelogs/unreleased/bvl-dont-move-projects-using-hashed-storage.yml

+---
+title: Don't move repositories and attachments for projects using hashed storage
+merge_request: 15479
+author:
+type: other

lib/gitlab/database/rename_reserved_paths_migration/v1/migration_classes.rb

@@ -68,6 +68,11 @@ module Gitlab
             has_one :route, as: :source
             self.table_name = 'projects'
 
+            HASHED_STORAGE_FEATURES = {
+              repository: 1,
+              attachments: 2
+            }.freeze
+
             def repository_storage_path
               Gitlab.config.repositories.storages[repository_storage]['path']
             end
@@ -76,6 +81,13 @@ module Gitlab
             def self.name
               'Project'
             end
+
+            def hashed_storage?(feature)
+              raise ArgumentError, "Invalid feature" unless HASHED_STORAGE_FEATURES.include?(feature)
+              return false unless respond_to?(:storage_version)
+
+              self.storage_version && self.storage_version >= HASHED_STORAGE_FEATURES[feature]
+            end
           end
         end
       end

lib/gitlab/database/rename_reserved_paths_migration/v1/rename_projects.rb

@@ -22,9 +22,11 @@ module Gitlab
           end
 
           def move_project_folders(project, old_full_path, new_full_path)
-            move_repository(project, old_full_path, new_full_path)
-            move_repository(project, "#{old_full_path}.wiki", "#{new_full_path}.wiki")
-            move_uploads(old_full_path, new_full_path)
+            unless project.hashed_storage?(:repository)
+              move_repository(project, old_full_path, new_full_path)
+              move_repository(project, "#{old_full_path}.wiki", "#{new_full_path}.wiki")
+            end
+            move_uploads(old_full_path, new_full_path) unless project.hashed_storage?(:attachments)
             move_pages(old_full_path, new_full_path)
           end
 

spec/lib/gitlab/database/rename_reserved_paths_migration/v1/rename_projects_spec.rb

@@ -87,6 +87,14 @@ describe Gitlab::Database::RenameReservedPathsMigration::V1::RenameProjects, :tr
       subject.move_project_folders(project, 'known-parent/the-path', 'known-parent/the-path0')
     end
 
+    it 'does not move the repositories when hashed storage is enabled' do
+      project.update!(storage_version: Project::HASHED_STORAGE_FEATURES[:repository])
+
+      expect(subject).not_to receive(:move_repository)
+
+      subject.move_project_folders(project, 'known-parent/the-path', 'known-parent/the-path0')
+    end
+
     it 'moves uploads' do
       expect(subject).to receive(:move_uploads)
                            .with('known-parent/the-path', 'known-parent/the-path0')
@@ -94,6 +102,14 @@ describe Gitlab::Database::RenameReservedPathsMigration::V1::RenameProjects, :tr
       subject.move_project_folders(project, 'known-parent/the-path', 'known-parent/the-path0')
     end
 
+    it 'does not move uploads when hashed storage is enabled for attachments' do
+      project.update!(storage_version: Project::HASHED_STORAGE_FEATURES[:attachments])
+
+      expect(subject).not_to receive(:move_uploads)
+
+      subject.move_project_folders(project, 'known-parent/the-path', 'known-parent/the-path0')
+    end
+
     it 'moves pages' do
       expect(subject).to receive(:move_pages)
                            .with('known-parent/the-path', 'known-parent/the-path0')