Import projects with LFS objects

If the LFS object already exist, we'll link it tot he existing one, if
not we'll create it.

7 files changed, 195 insertions, 3 deletions

diff --git a/lib/gitlab/import_export/importer.rb b/lib/gitlab/import_export/importer.rb
index c38df9102eb..c490bf059d2 100644
--- a/lib/gitlab/import_export/importer.rb
+++ b/lib/gitlab/import_export/importer.rb
@@ -13,7 +13,7 @@ module Gitlab
       end
 
       def execute
-        if import_file && check_version! && [repo_restorer, wiki_restorer, project_tree, avatar_restorer, uploads_restorer].all?(&:restore)
+        if import_file && check_version! && restorers.all?(&:restore)
           project_tree.restored_project
         else
           raise Projects::ImportService::Error.new(@shared.errors.join(', '))
@@ -24,6 +24,11 @@ module Gitlab
 
       private
 
+      def restorers
+        [repo_restorer, wiki_restorer, project_tree, avatar_restorer,
+         uploads_restorer, lfs_restorer]
+      end
+
       def import_file
         Gitlab::ImportExport::FileImporter.import(archive_file: @archive_file,
                                                   shared: @shared)
@@ -60,6 +65,10 @@ module Gitlab
         Gitlab::ImportExport::UploadsRestorer.new(project: project_tree.restored_project, shared: @shared)
       end
 
+      def lfs_restorer
+        Gitlab::ImportExport::LfsRestorer.new(project: project_tree.restored_project, shared: @shared)
+      end
+
       def path_with_namespace
         File.join(@project.namespace.full_path, @project.path)
       end
diff --git a/lib/gitlab/import_export/lfs_restorer.rb b/lib/gitlab/import_export/lfs_restorer.rb
new file mode 100644
index 00000000000..4f144d5c8e6
--- /dev/null
+++ b/lib/gitlab/import_export/lfs_restorer.rb
@@ -0,0 +1,43 @@
+module Gitlab
+  module ImportExport
+    class LfsRestorer
+      def initialize(project:, shared:)
+        @project = project
+        @shared = shared
+      end
+
+      def restore
+        return true if lfs_file_paths.empty?
+
+        lfs_file_paths.each do |file_path|
+          link_or_create_lfs_object!(file_path)
+        end
+
+        true
+      rescue => e
+        @shared.error(e)
+        false
+      end
+
+      private
+
+      def link_or_create_lfs_object!(path)
+        size = File.size(path)
+        oid = LfsObject.calculate_oid(path)
+
+        lfs_object = LfsObject.find_or_initialize_by(oid: oid, size: size)
+        lfs_object.file = File.open(path) unless lfs_object.file&.exists?
+
+        @project.lfs_storage_project.lfs_objects << lfs_object
+      end
+
+      def lfs_file_paths
+        @lfs_file_paths ||= Dir.glob("#{lfs_storage_path}/*")
+      end
+
+      def lfs_storage_path
+        File.join(@shared.export_path, 'lfs-objects')
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/import_export/lfs_saver.rb b/lib/gitlab/import_export/lfs_saver.rb
index bb7a070fe15..d796440902b 100644
--- a/lib/gitlab/import_export/lfs_saver.rb
+++ b/lib/gitlab/import_export/lfs_saver.rb
@@ -11,7 +11,7 @@ module Gitlab
       def save
         return true if @project.lfs_objects.empty?
 
-        @project.lfs_objects.each do |lfs_object|
+        @project.lfs_storage_project.lfs_objects.each do |lfs_object|
           save_lfs_object(lfs_object)
         end
 
diff --git a/spec/fixtures/exported-project.gz b/spec/fixtures/exported-project.gz
new file mode 100644
index 00000000000..352384f16c8
--- /dev/null
+++ b/spec/fixtures/exported-project.gz
diff --git a/spec/lib/gitlab/import_export/importer_spec.rb b/spec/lib/gitlab/import_export/importer_spec.rb
new file mode 100644
index 00000000000..d75416f2a62
--- /dev/null
+++ b/spec/lib/gitlab/import_export/importer_spec.rb
@@ -0,0 +1,64 @@
+require 'spec_helper'
+
+describe Gitlab::ImportExport::Importer do
+  let(:test_path) { "#{Dir.tmpdir}/importer_spec" }
+  let(:shared) { project.import_export_shared }
+  let(:project) { create(:project, import_source: File.join(test_path, 'exported-project.gz')) }
+
+  subject(:importer) { described_class.new(project) }
+
+  before do
+    allow_any_instance_of(Gitlab::ImportExport).to receive(:storage_path).and_return(test_path)
+    FileUtils.mkdir_p(shared.export_path)
+    FileUtils.cp(Rails.root.join('spec', 'fixtures', 'exported-project.gz'), test_path)
+  end
+
+  after do
+    FileUtils.rm_rf(test_path)
+  end
+
+  describe '#execute' do
+    it 'succeeds' do
+      importer.execute
+
+      expect(shared.errors).to be_empty
+    end
+
+    it 'extracts the archive'  do
+      expect(Gitlab::ImportExport::FileImporter).to receive(:import).and_call_original
+
+      importer.execute
+    end
+
+    it 'checks the version' do
+      expect(Gitlab::ImportExport::VersionChecker).to receive(:check!).and_call_original
+
+      importer.execute
+    end
+
+    context 'all restores are executed' do
+      [
+        Gitlab::ImportExport::AvatarRestorer,
+        Gitlab::ImportExport::RepoRestorer,
+        Gitlab::ImportExport::WikiRestorer,
+        Gitlab::ImportExport::UploadsRestorer,
+        Gitlab::ImportExport::LfsRestorer
+      ].each do |restorer|
+        it "calls the #{restorer}" do
+          fake_restorer = double(restorer.to_s)
+
+          expect(fake_restorer).to receive(:restore).and_return(true).at_least(1)
+          expect(restorer).to receive(:new).and_return(fake_restorer).at_least(1)
+
+          importer.execute
+        end
+      end
+
+      it 'restores the ProjectTree' do
+        expect(Gitlab::ImportExport::ProjectTreeRestorer).to receive(:new).and_call_original
+
+        importer.execute
+      end
+    end
+  end
+end
diff --git a/spec/lib/gitlab/import_export/lfs_restorer_spec.rb b/spec/lib/gitlab/import_export/lfs_restorer_spec.rb
new file mode 100644
index 00000000000..70eeb9ee66b
--- /dev/null
+++ b/spec/lib/gitlab/import_export/lfs_restorer_spec.rb
@@ -0,0 +1,75 @@
+require 'spec_helper'
+
+describe Gitlab::ImportExport::LfsRestorer do
+  include UploadHelpers
+
+  let(:export_path) { "#{Dir.tmpdir}/lfs_object_restorer_spec" }
+  let(:project) { create(:project) }
+  let(:shared) { project.import_export_shared }
+  subject(:restorer) { described_class.new(project: project, shared: shared) }
+
+  before do
+    allow_any_instance_of(Gitlab::ImportExport).to receive(:storage_path).and_return(export_path)
+    FileUtils.mkdir_p(shared.export_path)
+  end
+
+  after do
+    FileUtils.rm_rf(shared.export_path)
+  end
+
+  describe '#restore' do
+    context 'when the archive contains lfs files' do
+      let(:dummy_lfs_file_path) { File.join(shared.export_path, 'lfs-objects', 'dummy') }
+
+      def create_lfs_object_with_content(content)
+        dummy_lfs_file = Tempfile.new('existing')
+        File.write(dummy_lfs_file.path, content)
+        size = dummy_lfs_file.size
+        oid = LfsObject.calculate_oid(dummy_lfs_file.path)
+        LfsObject.create!(oid: oid, size: size, file: dummy_lfs_file)
+      end
+
+      before do
+        FileUtils.mkdir_p(File.dirname(dummy_lfs_file_path))
+        File.write(dummy_lfs_file_path, 'not very large')
+        allow(restorer).to receive(:lfs_file_paths).and_return([dummy_lfs_file_path])
+      end
+
+      it 'creates an lfs object for the project' do
+        expect { restorer.restore }.to change { project.reload.lfs_objects.size }.by(1)
+      end
+
+      it 'assigns the file correctly' do
+        restorer.restore
+
+        expect(project.lfs_objects.first.file.read).to eq('not very large')
+      end
+
+      it 'links an existing LFS object if it existed' do
+        lfs_object = create_lfs_object_with_content('not very large')
+
+        restorer.restore
+
+        expect(project.lfs_objects).to include(lfs_object)
+      end
+
+      it 'succeeds' do
+        expect(restorer.restore).to be_truthy
+        expect(shared.errors).to be_empty
+      end
+
+      it 'stores the upload' do
+        expect_any_instance_of(LfsObjectUploader).to receive(:store!)
+
+        restorer.restore
+      end
+    end
+
+    context 'without any LFS-objects' do
+      it 'succeeds' do
+        expect(restorer.restore).to be_truthy
+        expect(shared.errors).to be_empty
+      end
+    end
+  end
+end
diff --git a/spec/lib/gitlab/import_export/lfs_saver_spec.rb b/spec/lib/gitlab/import_export/lfs_saver_spec.rb
index e2237cd22cf..e62afac1c48 100644
--- a/spec/lib/gitlab/import_export/lfs_saver_spec.rb
+++ b/spec/lib/gitlab/import_export/lfs_saver_spec.rb
@@ -19,8 +19,9 @@ describe Gitlab::ImportExport::LfsSaver do
   describe '#save' do
     context 'when the project has LFS objects' do
       let(:lfs_object) { create(:lfs_object, :with_file) }
+
       before do
-        project.lfs_objects << lfs_object\
+        project.lfs_objects << lfs_object
       end
 
       it 'does not cause errors' do