Set artifact working directory to be in the destination store to prevent unnecessary I/O

Similar to #33218, build artifacts were being uploaded into a CarrierWave
temporary directory in the Rails root directory before moved to their
final destination, which could cause a copy across filesystems. This
merge request refactors the work in !11866 so that any uploader can
just override `work_dir` to change the default implementation.

Closes #33274

app/uploaders/artifact_uploader.rb

@@ -23,6 +23,10 @@ class ArtifactUploader < GitlabUploader
     File.join(self.class.local_artifacts_store, 'tmp/cache')
   end
 
+  def work_dir
+    File.join(self.class.local_artifacts_store, 'tmp/work')
+  end
+
   private
 
   def default_local_path

app/uploaders/gitlab_uploader.rb

@@ -41,4 +41,23 @@ class GitlabUploader < CarrierWave::Uploader::Base
   def exists?
     file.try(:exists?)
   end
+
+  # Override this if you don't want to save files by default to the Rails.root directory
+  def work_dir
+    # Default path set by CarrierWave:
+    # https://github.com/carrierwaveuploader/carrierwave/blob/v1.0.0/lib/carrierwave/uploader/cache.rb#L182
+    CarrierWave.tmp_path
+  end
+
+  private
+
+  # To prevent files from moving across filesystems, override the default
+  # implementation:
+  # http://github.com/carrierwaveuploader/carrierwave/blob/v1.0.0/lib/carrierwave/uploader/cache.rb#L181-L183
+  def workfile_path(for_file = original_filename)
+    # To be safe, keep this directory outside of the the cache directory
+    # because calling CarrierWave.clean_cache_files! will remove any files in
+    # the cache directory.
+    File.join(work_dir, @cache_id, version_name.to_s, for_file)
+  end
 end

app/uploaders/lfs_object_uploader.rb

@@ -16,16 +16,4 @@ class LfsObjectUploader < GitlabUploader
   def work_dir
     File.join(Gitlab.config.lfs.storage_path, 'tmp', 'work')
   end
-
-  private
-
-  # To prevent LFS files from moving across filesystems, override the default
-  # implementation:
-  # http://github.com/carrierwaveuploader/carrierwave/blob/v1.0.0/lib/carrierwave/uploader/cache.rb#L181-L183
-  def workfile_path(for_file = original_filename)
-    # To be safe, keep this directory outside of the the cache directory
-    # because calling CarrierWave.clean_cache_files! will remove any files in
-    # the cache directory.
-    File.join(work_dir, @cache_id, version_name.to_s, for_file)
-  end
 end

changelogs/unreleased/sh-fix-refactor-uploader-work-dir.yml

+---
+title: Set artifact working directory to be in the destination store to prevent unnecessary I/O
+merge_request:
+author:

spec/uploaders/artifact_uploader_spec.rb

@@ -33,6 +33,13 @@ describe ArtifactUploader do
     subject { uploader.cache_dir }
 
     it { is_expected.to start_with(path) }
-    it { is_expected.to end_with('tmp/cache') }
+    it { is_expected.to end_with('/tmp/cache') }
+  end
+
+  describe '#work_dir' do
+    subject { uploader.work_dir }
+
+    it { is_expected.to start_with(path) }
+    it { is_expected.to end_with('/tmp/work') }
   end
 end

spec/uploaders/gitlab_uploader_spec.rb

@@ -53,4 +53,19 @@ describe GitlabUploader do
       expect(subject.move_to_store).to eq(true)
     end
   end
+
+  describe '#cache!' do
+    it 'moves the file from the working directory to the cache directory' do
+      # One to get the work dir, the other to remove it
+      expect(subject).to receive(:workfile_path).exactly(2).times.and_call_original
+      # Test https://github.com/carrierwavesubject/carrierwave/blob/v1.0.0/lib/carrierwave/sanitized_file.rb#L200
+      expect(FileUtils).to receive(:mv).with(anything, /^#{subject.work_dir}/).and_call_original
+      expect(FileUtils).to receive(:mv).with(/^#{subject.work_dir}/, /#{subject.cache_dir}/).and_call_original
+
+      fixture = Rails.root.join('spec', 'fixtures', 'rails_sample.jpg')
+      subject.cache!(fixture_file_upload(fixture))
+
+      expect(subject.file.path).to match(/#{subject.cache_dir}/)
+    end
+  end
 end

spec/uploaders/lfs_object_uploader_spec.rb

 require 'spec_helper'
 
 describe LfsObjectUploader do
-  let(:uploader) { described_class.new(build_stubbed(:empty_project)) }
-
-  describe '#cache!' do
-    it 'caches the file in the cache directory' do
-      # One to get the work dir, the other to remove it
-      expect(uploader).to receive(:workfile_path).exactly(2).times.and_call_original
-      expect(FileUtils).to receive(:mv).with(anything, /^#{uploader.work_dir}/).and_call_original
-      expect(FileUtils).to receive(:mv).with(/^#{uploader.work_dir}/, /^#{uploader.cache_dir}/).and_call_original
-
-      fixture = Rails.root.join('spec', 'fixtures', 'rails_sample.jpg')
-      uploader.cache!(fixture_file_upload(fixture))
-
-      expect(uploader.file.path).to start_with(uploader.cache_dir)
-    end
-  end
+  let(:lfs_object) { create(:lfs_object, :with_file) }
+  let(:uploader) { described_class.new(lfs_object) }
+  let(:path) { Gitlab.config.lfs.storage_path }
 
   describe '#move_to_cache' do
     it 'is true' do
@@ -28,4 +16,25 @@ describe LfsObjectUploader do
       expect(uploader.move_to_store).to eq(true)
     end
   end
+
+  describe '#store_dir' do
+    subject { uploader.store_dir }
+
+    it { is_expected.to start_with(path) }
+    it { is_expected.to end_with("#{lfs_object.oid[0, 2]}/#{lfs_object.oid[2, 2]}") }
+  end
+
+  describe '#cache_dir' do
+    subject { uploader.cache_dir }
+
+    it { is_expected.to start_with(path) }
+    it { is_expected.to end_with('/tmp/cache') }
+  end
+
+  describe '#work_dir' do
+    subject { uploader.work_dir }
+
+    it { is_expected.to start_with(path) }
+    it { is_expected.to end_with('/tmp/work') }
+  end
 end