From e8f49b4bee8d803953b852685889a2912609ae84 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Francisco=20Javier=20L=C3=B3pez?= <fjlopez@gitlab.com>
Date: Wed, 6 Jun 2018 16:42:18 +0000
Subject: Support LFS objects when creating a project by import

---
 app/models/repository.rb                           |   4 +
 app/services/base_service.rb                       |   2 +-
 app/services/projects/import_service.rb            |  29 +++-
 .../lfs_pointers/lfs_download_link_list_service.rb |  93 +++++++++++++
 .../projects/lfs_pointers/lfs_download_service.rb  |  58 ++++++++
 .../projects/lfs_pointers/lfs_import_service.rb    |  92 +++++++++++++
 .../projects/lfs_pointers/lfs_link_service.rb      |  29 ++++
 .../projects/lfs_pointers/lfs_list_service.rb      |  19 +++
 app/workers/all_queues.yml                         |   2 +
 .../gitlab/github_import/advance_stage_worker.rb   |   1 +
 .../github_import/import_lfs_object_worker.rb      |  25 ++++
 .../stage/import_lfs_objects_worker.rb             |  32 +++++
 .../github_import/stage/import_notes_worker.rb     |   2 +-
 .../fj-40401-support-import-lfs-objects.yml        |   5 +
 lib/gitlab/git/repository.rb                       |   6 +-
 lib/gitlab/git/rev_list.rb                         |   9 +-
 .../github_import/importer/lfs_object_importer.rb  |  24 ++++
 .../github_import/importer/lfs_objects_importer.rb |  37 ++++++
 .../github_import/representation/lfs_object.rb     |  32 +++++
 lib/gitlab/github_import/sequential_importer.rb    |   3 +-
 spec/lib/gitlab/git/rev_list_spec.rb               |   2 +-
 .../importer/lfs_object_importer_spec.rb           |  23 ++++
 .../importer/lfs_objects_importer_spec.rb          |  94 +++++++++++++
 .../importer/repository_importer_spec.rb           |   3 +-
 spec/lib/gitlab/import_sources_spec.rb             |  19 +++
 spec/services/projects/import_service_spec.rb      |  72 +++++++++-
 .../lfs_download_link_list_service_spec.rb         | 102 ++++++++++++++
 .../lfs_pointers/lfs_download_service_spec.rb      |  69 ++++++++++
 .../lfs_pointers/lfs_import_service_spec.rb        | 146 +++++++++++++++++++++
 .../projects/lfs_pointers/lfs_link_service_spec.rb |  33 +++++
 .../stage/import_lfs_objects_worker_spec.rb        |  28 ++++
 .../stage/import_notes_worker_spec.rb              |   2 +-
 32 files changed, 1085 insertions(+), 12 deletions(-)
 create mode 100644 app/services/projects/lfs_pointers/lfs_download_link_list_service.rb
 create mode 100644 app/services/projects/lfs_pointers/lfs_download_service.rb
 create mode 100644 app/services/projects/lfs_pointers/lfs_import_service.rb
 create mode 100644 app/services/projects/lfs_pointers/lfs_link_service.rb
 create mode 100644 app/services/projects/lfs_pointers/lfs_list_service.rb
 create mode 100644 app/workers/gitlab/github_import/import_lfs_object_worker.rb
 create mode 100644 app/workers/gitlab/github_import/stage/import_lfs_objects_worker.rb
 create mode 100644 changelogs/unreleased/fj-40401-support-import-lfs-objects.yml
 create mode 100644 lib/gitlab/github_import/importer/lfs_object_importer.rb
 create mode 100644 lib/gitlab/github_import/importer/lfs_objects_importer.rb
 create mode 100644 lib/gitlab/github_import/representation/lfs_object.rb
 create mode 100644 spec/lib/gitlab/github_import/importer/lfs_object_importer_spec.rb
 create mode 100644 spec/lib/gitlab/github_import/importer/lfs_objects_importer_spec.rb
 create mode 100644 spec/services/projects/lfs_pointers/lfs_download_link_list_service_spec.rb
 create mode 100644 spec/services/projects/lfs_pointers/lfs_download_service_spec.rb
 create mode 100644 spec/services/projects/lfs_pointers/lfs_import_service_spec.rb
 create mode 100644 spec/services/projects/lfs_pointers/lfs_link_service_spec.rb
 create mode 100644 spec/workers/gitlab/github_import/stage/import_lfs_objects_worker_spec.rb

diff --git a/app/models/repository.rb b/app/models/repository.rb
index 0784891d1bf..e4202505634 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -956,6 +956,10 @@ class Repository
     blob_data_at(sha, path)
   end
 
+  def lfsconfig_for(sha)
+    blob_data_at(sha, '.lfsconfig')
+  end
+
   def fetch_ref(source_repository, source_ref:, target_ref:)
     raw_repository.fetch_ref(source_repository.raw_repository, source_ref: source_ref, target_ref: target_ref)
   end
diff --git a/app/services/base_service.rb b/app/services/base_service.rb
index 6883ba36c71..3519b7c5e7d 100644
--- a/app/services/base_service.rb
+++ b/app/services/base_service.rb
@@ -3,7 +3,7 @@ class BaseService
 
   attr_accessor :project, :current_user, :params
 
-  def initialize(project, user, params = {})
+  def initialize(project, user = nil, params = {})
     @project, @current_user, @params = project, user, params.dup
   end
 
diff --git a/app/services/projects/import_service.rb b/app/services/projects/import_service.rb
index 00080717600..1781a01cbd4 100644
--- a/app/services/projects/import_service.rb
+++ b/app/services/projects/import_service.rb
@@ -17,6 +17,8 @@ module Projects
     def execute
       add_repository_to_project
 
+      download_lfs_objects
+
       import_data
 
       success
@@ -37,7 +39,7 @@ module Projects
 
       # We should skip the repository for a GitHub import or GitLab project import,
       # because these importers fetch the project repositories for us.
-      return if has_importer? && importer_class.try(:imports_repository?)
+      return if importer_imports_repository?
 
       if unknown_url?
         # In this case, we only want to import issues, not a repository.
@@ -73,6 +75,27 @@ module Projects
       end
     end
 
+    def download_lfs_objects
+      # In this case, we only want to import issues
+      return if unknown_url?
+
+      # If it has its own repository importer, it has to implements its own lfs import download
+      return if importer_imports_repository?
+
+      return unless project.lfs_enabled?
+
+      oids_to_download = Projects::LfsPointers::LfsImportService.new(project).execute
+      download_service = Projects::LfsPointers::LfsDownloadService.new(project)
+
+      oids_to_download.each do |oid, link|
+        download_service.execute(oid, link)
+      end
+    rescue => e
+      # Right now, to avoid aborting the importing process, we silently fail
+      # if any exception raises.
+      Rails.logger.error("The Lfs import process failed. #{e.message}")
+    end
+
     def import_data
       return unless has_importer?
 
@@ -98,5 +121,9 @@ module Projects
     def unknown_url?
       project.import_url == Project::UNKNOWN_IMPORT_URL
     end
+
+    def importer_imports_repository?
+      has_importer? && importer_class.try(:imports_repository?)
+    end
   end
 end
diff --git a/app/services/projects/lfs_pointers/lfs_download_link_list_service.rb b/app/services/projects/lfs_pointers/lfs_download_link_list_service.rb
new file mode 100644
index 00000000000..d9fb74b090e
--- /dev/null
+++ b/app/services/projects/lfs_pointers/lfs_download_link_list_service.rb
@@ -0,0 +1,93 @@
+# This service lists the download link from a remote source based on the
+# oids provided
+module Projects
+  module LfsPointers
+    class LfsDownloadLinkListService < BaseService
+      DOWNLOAD_ACTION = 'download'.freeze
+
+      DownloadLinksError = Class.new(StandardError)
+      DownloadLinkNotFound = Class.new(StandardError)
+
+      attr_reader :remote_uri
+
+      def initialize(project, remote_uri: nil)
+        super(project)
+
+        @remote_uri = remote_uri
+      end
+
+      # This method accepts two parameters:
+      # - oids: hash of oids to query. The structure is { lfs_file_oid => lfs_file_size }
+      #
+      # Returns a hash with the structure { lfs_file_oids => download_link }
+      def execute(oids)
+        return {} unless project&.lfs_enabled? && remote_uri && oids.present?
+
+        get_download_links(oids)
+      end
+
+      private
+
+      def get_download_links(oids)
+        response = Gitlab::HTTP.post(remote_uri,
+                                     body: request_body(oids),
+                                     headers: headers)
+
+        raise DownloadLinksError, response.message unless response.success?
+
+        parse_response_links(response['objects'])
+      end
+
+      def parse_response_links(objects_response)
+        objects_response.each_with_object({}) do |entry, link_list|
+          begin
+            oid = entry['oid']
+            link = entry.dig('actions', DOWNLOAD_ACTION, 'href')
+
+            raise DownloadLinkNotFound unless link
+
+            link_list[oid] = add_credentials(link)
+          rescue DownloadLinkNotFound, URI::InvalidURIError
+            Rails.logger.error("Link for Lfs Object with oid #{oid} not found or invalid.")
+          end
+        end
+      end
+
+      def request_body(oids)
+        {
+          operation: DOWNLOAD_ACTION,
+          objects: oids.map { |oid, size| { oid: oid, size: size } }
+        }.to_json
+      end
+
+      def headers
+        {
+          'Accept' => LfsRequest::CONTENT_TYPE,
+          'Content-Type' => LfsRequest::CONTENT_TYPE
+        }.freeze
+      end
+
+      def add_credentials(link)
+        uri = URI.parse(link)
+
+        if should_add_credentials?(uri)
+          uri.user = remote_uri.user
+          uri.password = remote_uri.password
+        end
+
+        uri.to_s
+      end
+
+      # The download link can be a local url or an object storage url
+      # If the download link has the some host as the import url then
+      # we add the same credentials because we may need them
+      def should_add_credentials?(link_uri)
+        url_credentials? && link_uri.host == remote_uri.host
+      end
+
+      def url_credentials?
+        remote_uri.user.present? || remote_uri.password.present?
+      end
+    end
+  end
+end
diff --git a/app/services/projects/lfs_pointers/lfs_download_service.rb b/app/services/projects/lfs_pointers/lfs_download_service.rb
new file mode 100644
index 00000000000..6ea43561d61
--- /dev/null
+++ b/app/services/projects/lfs_pointers/lfs_download_service.rb
@@ -0,0 +1,58 @@
+# This service downloads and links lfs objects from a remote URL
+module Projects
+  module LfsPointers
+    class LfsDownloadService < BaseService
+      def execute(oid, url)
+        return unless project&.lfs_enabled? && oid.present? && url.present?
+
+        return if LfsObject.exists?(oid: oid)
+
+        sanitized_uri = Gitlab::UrlSanitizer.new(url)
+
+        with_tmp_file(oid) do |file|
+          size = download_and_save_file(file, sanitized_uri)
+          lfs_object = LfsObject.new(oid: oid, size: size, file: file)
+
+          project.all_lfs_objects << lfs_object
+        end
+      rescue StandardError => e
+        Rails.logger.error("LFS file with oid #{oid} could't be downloaded from #{sanitized_uri.sanitized_url}: #{e.message}")
+      end
+
+      private
+
+      def download_and_save_file(file, sanitized_uri)
+        IO.copy_stream(open(sanitized_uri.sanitized_url, headers(sanitized_uri)), file)
+      end
+
+      def headers(sanitized_uri)
+        {}.tap do |headers|
+          credentials = sanitized_uri.credentials
+
+          if credentials[:user].present? || credentials[:password].present?
+            # Using authentication headers in the request
+            headers[:http_basic_authentication] = [credentials[:user], credentials[:password]]
+          end
+        end
+      end
+
+      def with_tmp_file(oid)
+        create_tmp_storage_dir
+
+        File.open(File.join(tmp_storage_dir, oid), 'w') { |file| yield file }
+      end
+
+      def create_tmp_storage_dir
+        FileUtils.makedirs(tmp_storage_dir) unless Dir.exist?(tmp_storage_dir)
+      end
+
+      def tmp_storage_dir
+        @tmp_storage_dir ||= File.join(storage_dir, 'tmp', 'download')
+      end
+
+      def storage_dir
+        @storage_dir ||= Gitlab.config.lfs.storage_path
+      end
+    end
+  end
+end
diff --git a/app/services/projects/lfs_pointers/lfs_import_service.rb b/app/services/projects/lfs_pointers/lfs_import_service.rb
new file mode 100644
index 00000000000..b6b0dec142f
--- /dev/null
+++ b/app/services/projects/lfs_pointers/lfs_import_service.rb
@@ -0,0 +1,92 @@
+# This service manages the whole worflow of discovering the Lfs files in a
+# repository, linking them to the project and downloading (and linking) the non
+# existent ones.
+module Projects
+  module LfsPointers
+    class LfsImportService < BaseService
+      include Gitlab::Utils::StrongMemoize
+
+      HEAD_REV = 'HEAD'.freeze
+      LFS_ENDPOINT_PATTERN = /^\t?url\s*=\s*(.+)$/.freeze
+      LFS_BATCH_API_ENDPOINT = '/info/lfs/objects/batch'.freeze
+
+      LfsImportError = Class.new(StandardError)
+
+      def execute
+        return {} unless project&.lfs_enabled?
+
+        if external_lfs_endpoint?
+          # If the endpoint host is different from the import_url it means
+          # that the repo is using a third party service for storing the LFS files.
+          # In this case, we have to disable lfs in the project
+          disable_lfs!
+
+          return {}
+        end
+
+        get_download_links
+      rescue LfsDownloadLinkListService::DownloadLinksError => e
+        raise LfsImportError, "The LFS objects download list couldn't be imported. Error: #{e.message}"
+      end
+
+      private
+
+      def external_lfs_endpoint?
+        lfsconfig_endpoint_uri && lfsconfig_endpoint_uri.host != import_uri.host
+      end
+
+      def disable_lfs!
+        project.update(lfs_enabled: false)
+      end
+
+      def get_download_links
+        existent_lfs = LfsListService.new(project).execute
+        linked_oids = LfsLinkService.new(project).execute(existent_lfs.keys)
+
+        # Retrieving those oids not linked and which we need to download
+        not_linked_lfs = existent_lfs.except(*linked_oids)
+
+        LfsDownloadLinkListService.new(project, remote_uri: current_endpoint_uri).execute(not_linked_lfs)
+      end
+
+      def lfsconfig_endpoint_uri
+        strong_memoize(:lfsconfig_endpoint_uri) do
+          # Retrieveing the blob data from the .lfsconfig file
+          data = project.repository.lfsconfig_for(HEAD_REV)
+          # Parsing the data to retrieve the url
+          parsed_data = data&.match(LFS_ENDPOINT_PATTERN)
+
+          if parsed_data
+            URI.parse(parsed_data[1]).tap do |endpoint|
+              endpoint.user ||= import_uri.user
+              endpoint.password ||= import_uri.password
+            end
+          end
+        end
+      rescue URI::InvalidURIError
+        raise LfsImportError, 'Invalid URL in .lfsconfig file'
+      end
+
+      def import_uri
+        @import_uri ||= URI.parse(project.import_url)
+      rescue URI::InvalidURIError
+        raise LfsImportError, 'Invalid project import URL'
+      end
+
+      def current_endpoint_uri
+        (lfsconfig_endpoint_uri || default_endpoint_uri)
+      end
+
+      # The import url must end with '.git' here we ensure it is
+      def default_endpoint_uri
+        @default_endpoint_uri ||= begin
+          import_uri.dup.tap do |uri|
+            path = uri.path.gsub(%r(/$), '')
+            path += '.git' unless path.ends_with?('.git')
+            uri.path = path + LFS_BATCH_API_ENDPOINT
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/app/services/projects/lfs_pointers/lfs_link_service.rb b/app/services/projects/lfs_pointers/lfs_link_service.rb
new file mode 100644
index 00000000000..d20bdf86c58
--- /dev/null
+++ b/app/services/projects/lfs_pointers/lfs_link_service.rb
@@ -0,0 +1,29 @@
+# Given a list of oids, this services links the existent Lfs Objects to the project
+module Projects
+  module LfsPointers
+    class LfsLinkService < BaseService
+      # Accept an array of oids to link
+      #
+      # Returns a hash with the same structure with oids linked
+      def execute(oids)
+        return {} unless project&.lfs_enabled?
+
+        # Search and link existing LFS Object
+        link_existing_lfs_objects(oids)
+      end
+
+      private
+
+      def link_existing_lfs_objects(oids)
+        existent_lfs_objects = LfsObject.where(oid: oids)
+
+        return [] unless existent_lfs_objects.any?
+
+        not_linked_lfs_objects = existent_lfs_objects.where.not(id: project.all_lfs_objects)
+        project.all_lfs_objects << not_linked_lfs_objects
+
+        existent_lfs_objects.pluck(:oid)
+      end
+    end
+  end
+end
diff --git a/app/services/projects/lfs_pointers/lfs_list_service.rb b/app/services/projects/lfs_pointers/lfs_list_service.rb
new file mode 100644
index 00000000000..b770982cbc0
--- /dev/null
+++ b/app/services/projects/lfs_pointers/lfs_list_service.rb
@@ -0,0 +1,19 @@
+# This service list all existent Lfs objects in a repository
+module Projects
+  module LfsPointers
+    class LfsListService < BaseService
+      REV = 'HEAD'.freeze
+
+      # Retrieve all lfs blob pointers and returns a hash
+      # with the structure { lfs_file_oid => lfs_file_size }
+      def execute
+        return {} unless project&.lfs_enabled?
+
+        Gitlab::Git::LfsChanges.new(project.repository, REV)
+                               .all_pointers
+                               .map! { |blob| [blob.lfs_oid, blob.lfs_size] }
+                               .to_h
+      end
+    end
+  end
+end
diff --git a/app/workers/all_queues.yml b/app/workers/all_queues.yml
index e42995d9a28..30b6796a7d6 100644
--- a/app/workers/all_queues.yml
+++ b/app/workers/all_queues.yml
@@ -31,12 +31,14 @@
 - github_importer:github_import_import_diff_note
 - github_importer:github_import_import_issue
 - github_importer:github_import_import_note
+- github_importer:github_import_import_lfs_object
 - github_importer:github_import_import_pull_request
 - github_importer:github_import_refresh_import_jid
 - github_importer:github_import_stage_finish_import
 - github_importer:github_import_stage_import_base_data
 - github_importer:github_import_stage_import_issues_and_diff_notes
 - github_importer:github_import_stage_import_notes
+- github_importer:github_import_stage_import_lfs_objects
 - github_importer:github_import_stage_import_pull_requests
 - github_importer:github_import_stage_import_repository
 
diff --git a/app/workers/gitlab/github_import/advance_stage_worker.rb b/app/workers/gitlab/github_import/advance_stage_worker.rb
index 8d708e15a66..be0b6c180b0 100644
--- a/app/workers/gitlab/github_import/advance_stage_worker.rb
+++ b/app/workers/gitlab/github_import/advance_stage_worker.rb
@@ -21,6 +21,7 @@ module Gitlab
       STAGES = {
         issues_and_diff_notes: Stage::ImportIssuesAndDiffNotesWorker,
         notes: Stage::ImportNotesWorker,
+        lfs_objects: Stage::ImportLfsObjectsWorker,
         finish: Stage::FinishImportWorker
       }.freeze
 
diff --git a/app/workers/gitlab/github_import/import_lfs_object_worker.rb b/app/workers/gitlab/github_import/import_lfs_object_worker.rb
new file mode 100644
index 00000000000..520c5cb091a
--- /dev/null
+++ b/app/workers/gitlab/github_import/import_lfs_object_worker.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module GithubImport
+    class ImportLfsObjectWorker
+      include ObjectImporter
+
+      def representation_class
+        Representation::LfsObject
+      end
+
+      def importer_class
+        Importer::LfsObjectImporter
+      end
+
+      def counter_name
+        :github_importer_imported_lfs_objects
+      end
+
+      def counter_description
+        'The number of imported GitHub Lfs Objects'
+      end
+    end
+  end
+end
diff --git a/app/workers/gitlab/github_import/stage/import_lfs_objects_worker.rb b/app/workers/gitlab/github_import/stage/import_lfs_objects_worker.rb
new file mode 100644
index 00000000000..29257603a9d
--- /dev/null
+++ b/app/workers/gitlab/github_import/stage/import_lfs_objects_worker.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module GithubImport
+    module Stage
+      class ImportLfsObjectsWorker
+        include ApplicationWorker
+        include GithubImport::Queue
+        include StageMethods
+
+        def perform(project_id)
+          return unless (project = find_project(project_id))
+
+          import(project)
+        end
+
+        # project - An instance of Project.
+        def import(project)
+          waiter = Importer::LfsObjectsImporter
+            .new(project, nil)
+            .execute
+
+          AdvanceStageWorker.perform_async(
+            project.id,
+            { waiter.key => waiter.jobs_remaining },
+            :finish
+          )
+        end
+      end
+    end
+  end
+end
diff --git a/app/workers/gitlab/github_import/stage/import_notes_worker.rb b/app/workers/gitlab/github_import/stage/import_notes_worker.rb
index 5f4678a595f..ccf0013180d 100644
--- a/app/workers/gitlab/github_import/stage/import_notes_worker.rb
+++ b/app/workers/gitlab/github_import/stage/import_notes_worker.rb
@@ -18,7 +18,7 @@ module Gitlab
           AdvanceStageWorker.perform_async(
             project.id,
             { waiter.key => waiter.jobs_remaining },
-            :finish
+            :lfs_objects
           )
         end
       end
diff --git a/changelogs/unreleased/fj-40401-support-import-lfs-objects.yml b/changelogs/unreleased/fj-40401-support-import-lfs-objects.yml
new file mode 100644
index 00000000000..a8abdd943ba
--- /dev/null
+++ b/changelogs/unreleased/fj-40401-support-import-lfs-objects.yml
@@ -0,0 +1,5 @@
+---
+title: Added support for LFS Download in the importing process
+merge_request: 18871
+author:
+type: fixed
diff --git a/lib/gitlab/git/repository.rb b/lib/gitlab/git/repository.rb
index d1b13ca2342..93f9adaf1f1 100644
--- a/lib/gitlab/git/repository.rb
+++ b/lib/gitlab/git/repository.rb
@@ -1543,7 +1543,7 @@ module Gitlab
         end
       end
 
-      def rev_list(including: [], excluding: [], objects: false, &block)
+      def rev_list(including: [], excluding: [], options: [], objects: false, &block)
         args = ['rev-list']
 
         args.push(*rev_list_param(including))
@@ -1556,6 +1556,10 @@ module Gitlab
 
         args.push('--objects') if objects
 
+        if options.any?
+          args.push(*options)
+        end
+
         run_git!(args, lazy_block: block)
       end
 
diff --git a/lib/gitlab/git/rev_list.rb b/lib/gitlab/git/rev_list.rb
index 38c3a55f96f..79544ccf13d 100644
--- a/lib/gitlab/git/rev_list.rb
+++ b/lib/gitlab/git/rev_list.rb
@@ -38,7 +38,10 @@ module Gitlab
       end
 
       def all_objects(require_path: nil, &lazy_block)
-        get_objects(including: :all, require_path: require_path, &lazy_block)
+        get_objects(including: :all,
+                    options: ["--filter=blob:limit=#{Gitlab::Git::Blob::LFS_POINTER_MAX_SIZE}"],
+                    require_path: require_path,
+                    &lazy_block)
       end
 
       # This methods returns an array of missed references
@@ -54,8 +57,8 @@ module Gitlab
         repository.rev_list(args).split("\n")
       end
 
-      def get_objects(including: [], excluding: [], require_path: nil)
-        opts = { including: including, excluding: excluding, objects: true }
+      def get_objects(including: [], excluding: [], options: [], require_path: nil)
+        opts = { including: including, excluding: excluding, options: options, objects: true }
 
         repository.rev_list(opts) do |lazy_output|
           objects = objects_from_output(lazy_output, require_path: require_path)
diff --git a/lib/gitlab/github_import/importer/lfs_object_importer.rb b/lib/gitlab/github_import/importer/lfs_object_importer.rb
new file mode 100644
index 00000000000..a88c17aaf82
--- /dev/null
+++ b/lib/gitlab/github_import/importer/lfs_object_importer.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module GithubImport
+    module Importer
+      class LfsObjectImporter
+        attr_reader :lfs_object, :project
+
+        # lfs_object - An instance of `Gitlab::GithubImport::Representation::LfsObject`.
+        # project - An instance of `Project`.
+        def initialize(lfs_object, project, _)
+          @lfs_object = lfs_object
+          @project = project
+        end
+
+        def execute
+          Projects::LfsPointers::LfsDownloadService
+            .new(project)
+            .execute(lfs_object.oid, lfs_object.download_link)
+        end
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/github_import/importer/lfs_objects_importer.rb b/lib/gitlab/github_import/importer/lfs_objects_importer.rb
new file mode 100644
index 00000000000..6046e30d4ef
--- /dev/null
+++ b/lib/gitlab/github_import/importer/lfs_objects_importer.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module GithubImport
+    module Importer
+      class LfsObjectsImporter
+        include ParallelScheduling
+
+        def importer_class
+          LfsObjectImporter
+        end
+
+        def representation_class
+          Representation::LfsObject
+        end
+
+        def sidekiq_worker_class
+          ImportLfsObjectWorker
+        end
+
+        def collection_method
+          :lfs_objects
+        end
+
+        def each_object_to_import
+          lfs_objects = Projects::LfsPointers::LfsImportService.new(project).execute
+
+          lfs_objects.each do |object|
+            yield object
+          end
+        rescue StandardError => e
+          Rails.logger.error("The Lfs import process failed. #{e.message}")
+        end
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/github_import/representation/lfs_object.rb b/lib/gitlab/github_import/representation/lfs_object.rb
new file mode 100644
index 00000000000..debe0fa0baf
--- /dev/null
+++ b/lib/gitlab/github_import/representation/lfs_object.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module GithubImport
+    module Representation
+      class LfsObject
+        include ToHash
+        include ExposeAttribute
+
+        attr_reader :attributes
+
+        expose_attribute :oid, :download_link
+
+        # Builds a lfs_object
+        def self.from_api_response(lfs_object)
+          new({ oid: lfs_object[0], download_link: lfs_object[1] })
+        end
+
+        # Builds a new lfs_object using a Hash that was built from a JSON payload.
+        def self.from_json_hash(raw_hash)
+          new(Representation.symbolize_hash(raw_hash))
+        end
+
+        # attributes - A Hash containing the raw lfs_object details. The keys of this
+        #              Hash must be Symbols.
+        def initialize(attributes)
+          @attributes = attributes
+        end
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/github_import/sequential_importer.rb b/lib/gitlab/github_import/sequential_importer.rb
index 4f7324536a0..3cad919b4eb 100644
--- a/lib/gitlab/github_import/sequential_importer.rb
+++ b/lib/gitlab/github_import/sequential_importer.rb
@@ -19,7 +19,8 @@ module Gitlab
         Importer::PullRequestsImporter,
         Importer::IssuesImporter,
         Importer::DiffNotesImporter,
-        Importer::NotesImporter
+        Importer::NotesImporter,
+        Importer::LfsObjectsImporter
       ].freeze
 
       # project - The project to import the data into.
diff --git a/spec/lib/gitlab/git/rev_list_spec.rb b/spec/lib/gitlab/git/rev_list_spec.rb
index 95dc47e2a00..70e90659b0f 100644
--- a/spec/lib/gitlab/git/rev_list_spec.rb
+++ b/spec/lib/gitlab/git/rev_list_spec.rb
@@ -88,7 +88,7 @@ describe Gitlab::Git::RevList do
 
   context '#all_objects' do
     it 'fetches list of all pushed objects using rev-list' do
-      stub_popen_rev_list('--all', '--objects', output: "sha1\nsha2")
+      stub_popen_rev_list('--all', '--objects', '--filter=blob:limit=200', output: "sha1\nsha2")
 
       expect { |b| rev_list.all_objects(&b) }.to yield_with_args(%w[sha1 sha2])
     end
diff --git a/spec/lib/gitlab/github_import/importer/lfs_object_importer_spec.rb b/spec/lib/gitlab/github_import/importer/lfs_object_importer_spec.rb
new file mode 100644
index 00000000000..4857f2afbe2
--- /dev/null
+++ b/spec/lib/gitlab/github_import/importer/lfs_object_importer_spec.rb
@@ -0,0 +1,23 @@
+require 'spec_helper'
+
+describe Gitlab::GithubImport::Importer::LfsObjectImporter do
+  let(:project) { create(:project) }
+  let(:download_link) { "http://www.gitlab.com/lfs_objects/oid" }
+
+  let(:github_lfs_object) do
+    Gitlab::GithubImport::Representation::LfsObject.new(
+      oid: 'oid', download_link: download_link
+    )
+  end
+
+  let(:importer) { described_class.new(github_lfs_object, project, nil) }
+
+  describe '#execute' do
+    it 'calls the LfsDownloadService with the lfs object attributes' do
+      expect_any_instance_of(Projects::LfsPointers::LfsDownloadService)
+        .to receive(:execute).with('oid', download_link)
+
+      importer.execute
+    end
+  end
+end
diff --git a/spec/lib/gitlab/github_import/importer/lfs_objects_importer_spec.rb b/spec/lib/gitlab/github_import/importer/lfs_objects_importer_spec.rb
new file mode 100644
index 00000000000..5f5c6b803c0
--- /dev/null
+++ b/spec/lib/gitlab/github_import/importer/lfs_objects_importer_spec.rb
@@ -0,0 +1,94 @@
+require 'spec_helper'
+
+describe Gitlab::GithubImport::Importer::LfsObjectsImporter do
+  let(:project) { double(:project, id: 4, import_source: 'foo/bar') }
+  let(:client) { double(:client) }
+  let(:download_link) { "http://www.gitlab.com/lfs_objects/oid" }
+
+  let(:github_lfs_object) { ['oid', download_link] }
+
+  describe '#parallel?' do
+    it 'returns true when running in parallel mode' do
+      importer = described_class.new(project, client)
+      expect(importer).to be_parallel
+    end
+
+    it 'returns false when running in sequential mode' do
+      importer = described_class.new(project, client, parallel: false)
+      expect(importer).not_to be_parallel
+    end
+  end
+
+  describe '#execute' do
+    context 'when running in parallel mode' do
+      it 'imports lfs objects in parallel' do
+        importer = described_class.new(project, client)
+
+        expect(importer).to receive(:parallel_import)
+
+        importer.execute
+      end
+    end
+
+    context 'when running in sequential mode' do
+      it 'imports lfs objects in sequence' do
+        importer = described_class.new(project, client, parallel: false)
+
+        expect(importer).to receive(:sequential_import)
+
+        importer.execute
+      end
+    end
+  end
+
+  describe '#sequential_import' do
+    it 'imports each lfs object in sequence' do
+      importer = described_class.new(project, client, parallel: false)
+      lfs_object_importer = double(:lfs_object_importer)
+
+      allow(importer)
+        .to receive(:each_object_to_import)
+        .and_yield(['oid', download_link])
+
+      expect(Gitlab::GithubImport::Importer::LfsObjectImporter)
+        .to receive(:new)
+        .with(
+          an_instance_of(Gitlab::GithubImport::Representation::LfsObject),
+          project,
+          client
+        )
+        .and_return(lfs_object_importer)
+
+      expect(lfs_object_importer).to receive(:execute)
+
+      importer.sequential_import
+    end
+  end
+
+  describe '#parallel_import' do
+    it 'imports each lfs object in parallel' do
+      importer = described_class.new(project, client)
+
+      allow(importer)
+        .to receive(:each_object_to_import)
+        .and_yield(github_lfs_object)
+
+      expect(Gitlab::GithubImport::ImportLfsObjectWorker)
+        .to receive(:perform_async)
+        .with(project.id, an_instance_of(Hash), an_instance_of(String))
+
+      waiter = importer.parallel_import
+
+      expect(waiter).to be_an_instance_of(Gitlab::JobWaiter)
+      expect(waiter.jobs_remaining).to eq(1)
+    end
+  end
+
+  describe '#collection_options' do
+    it 'returns an empty Hash' do
+      importer = described_class.new(project, client)
+
+      expect(importer.collection_options).to eq({})
+    end
+  end
+end
diff --git a/spec/lib/gitlab/github_import/importer/repository_importer_spec.rb b/spec/lib/gitlab/github_import/importer/repository_importer_spec.rb
index cc9e4b67e72..d8f01dcb76b 100644
--- a/spec/lib/gitlab/github_import/importer/repository_importer_spec.rb
+++ b/spec/lib/gitlab/github_import/importer/repository_importer_spec.rb
@@ -14,7 +14,8 @@ describe Gitlab::GithubImport::Importer::RepositoryImporter do
       disk_path: 'foo',
       repository: repository,
       create_wiki: true,
-      import_state: import_state
+      import_state: import_state,
+      lfs_enabled?: true
     )
   end
 
diff --git a/spec/lib/gitlab/import_sources_spec.rb b/spec/lib/gitlab/import_sources_spec.rb
index f2fa315e3ec..10341486512 100644
--- a/spec/lib/gitlab/import_sources_spec.rb
+++ b/spec/lib/gitlab/import_sources_spec.rb
@@ -91,4 +91,23 @@ describe Gitlab::ImportSources do
       end
     end
   end
+
+  describe 'imports_repository? checker' do
+    let(:allowed_importers) { %w[github gitlab_project] }
+
+    it 'fails if any importer other than the allowed ones implements this method' do
+      current_importers = described_class.values.select { |kind| described_class.importer(kind).try(:imports_repository?) }
+      not_allowed_importers = current_importers - allowed_importers
+
+      expect(not_allowed_importers).to be_empty, failure_message(not_allowed_importers)
+    end
+
+    def failure_message(importers_class_names)
+      <<-MSG
+        It looks like the #{importers_class_names.join(', ')} importers implements its own way to import the repository.
+        That means that the lfs object download must be handled for each of them. You can use 'LfsImportService' and
+        'LfsDownloadService' to implement it. After that, add the importer name to the list of allowed importers in this spec.
+      MSG
+    end
+  end
 end
diff --git a/spec/services/projects/import_service_spec.rb b/spec/services/projects/import_service_spec.rb
index 30c89ebd821..b3815045792 100644
--- a/spec/services/projects/import_service_spec.rb
+++ b/spec/services/projects/import_service_spec.rb
@@ -3,9 +3,17 @@ require 'spec_helper'
 describe Projects::ImportService do
   let!(:project) { create(:project) }
   let(:user) { project.creator }
+  let(:import_url) { 'http://www.gitlab.com/demo/repo.git' }
+  let(:oid_download_links) { { 'oid1' => "#{import_url}/gitlab-lfs/objects/oid1", 'oid2' => "#{import_url}/gitlab-lfs/objects/oid2" } }
 
   subject { described_class.new(project, user) }
 
+  before do
+    allow(project).to receive(:lfs_enabled?).and_return(true)
+    allow_any_instance_of(Projects::LfsPointers::LfsDownloadService).to receive(:execute)
+    allow_any_instance_of(Projects::LfsPointers::LfsImportService).to receive(:execute).and_return(oid_download_links)
+  end
+
   describe '#async?' do
     it 'returns true for an asynchronous importer' do
       importer_class = double(:importer, async?: true)
@@ -63,6 +71,15 @@ describe Projects::ImportService do
         expect(result[:status]).to eq :error
         expect(result[:message]).to eq "Error importing repository #{project.import_url} into #{project.full_path} - The repository could not be created."
       end
+
+      context 'when repository creation succeeds' do
+        it 'does not download lfs files' do
+          expect_any_instance_of(Projects::LfsPointers::LfsImportService).not_to receive(:execute)
+          expect_any_instance_of(Projects::LfsPointers::LfsDownloadService).not_to receive(:execute)
+
+          subject.execute
+        end
+      end
     end
 
     context 'with known url' do
@@ -91,6 +108,15 @@ describe Projects::ImportService do
 
           expect(result[:status]).to eq :error
         end
+
+        context 'when repository import scheduled' do
+          it 'does not download lfs objects' do
+            expect_any_instance_of(Projects::LfsPointers::LfsImportService).not_to receive(:execute)
+            expect_any_instance_of(Projects::LfsPointers::LfsDownloadService).not_to receive(:execute)
+
+            subject.execute
+          end
+        end
       end
 
       context 'with a non Github repository' do
@@ -99,9 +125,10 @@ describe Projects::ImportService do
           project.import_type = 'bitbucket'
         end
 
-        it 'succeeds if repository import is successfully' do
+        it 'succeeds if repository import is successfull' do
           expect_any_instance_of(Gitlab::Shell).to receive(:import_repository).and_return(true)
           expect_any_instance_of(Gitlab::BitbucketImport::Importer).to receive(:execute).and_return(true)
+          expect_any_instance_of(Projects::LfsPointers::LfsImportService).to receive(:execute).and_return({})
 
           result = subject.execute
 
@@ -116,6 +143,29 @@ describe Projects::ImportService do
           expect(result[:status]).to eq :error
           expect(result[:message]).to eq "Error importing repository #{project.import_url} into #{project.full_path} - Failed to import the repository"
         end
+
+        context 'when repository import scheduled' do
+          before do
+            allow_any_instance_of(Gitlab::Shell).to receive(:import_repository).and_return(true)
+            allow(subject).to receive(:import_data)
+          end
+
+          it 'downloads lfs objects if lfs_enabled is enabled for project' do
+            allow(project).to receive(:lfs_enabled?).and_return(true)
+            expect_any_instance_of(Projects::LfsPointers::LfsImportService).to receive(:execute).and_return(oid_download_links)
+            expect_any_instance_of(Projects::LfsPointers::LfsDownloadService).to receive(:execute).twice
+
+            subject.execute
+          end
+
+          it 'does not download lfs objects if lfs_enabled is not enabled for project' do
+            allow(project).to receive(:lfs_enabled?).and_return(false)
+            expect_any_instance_of(Projects::LfsPointers::LfsImportService).not_to receive(:execute)
+            expect_any_instance_of(Projects::LfsPointers::LfsDownloadService).not_to receive(:execute)
+
+            subject.execute
+          end
+        end
       end
     end
 
@@ -147,6 +197,26 @@ describe Projects::ImportService do
 
         expect(result[:status]).to eq :error
       end
+
+      context 'when importer' do
+        it 'has a custom repository importer it does not download lfs objects' do
+          allow(Gitlab::GithubImport::ParallelImporter).to receive(:imports_repository?).and_return(true)
+
+          expect_any_instance_of(Projects::LfsPointers::LfsImportService).not_to receive(:execute)
+          expect_any_instance_of(Projects::LfsPointers::LfsDownloadService).not_to receive(:execute)
+
+          subject.execute
+        end
+
+        it 'does not have a custom repository importer downloads lfs objects' do
+          allow(Gitlab::GithubImport::ParallelImporter).to receive(:imports_repository?).and_return(false)
+
+          expect_any_instance_of(Projects::LfsPointers::LfsImportService).to receive(:execute).and_return(oid_download_links)
+          expect_any_instance_of(Projects::LfsPointers::LfsDownloadService).to receive(:execute)
+
+          subject.execute
+        end
+      end
     end
 
     context 'with blocked import_URL' do
diff --git a/spec/services/projects/lfs_pointers/lfs_download_link_list_service_spec.rb b/spec/services/projects/lfs_pointers/lfs_download_link_list_service_spec.rb
new file mode 100644
index 00000000000..d7a2829d5f8
--- /dev/null
+++ b/spec/services/projects/lfs_pointers/lfs_download_link_list_service_spec.rb
@@ -0,0 +1,102 @@
+require 'spec_helper'
+
+describe Projects::LfsPointers::LfsDownloadLinkListService do
+  let(:import_url) { 'http://www.gitlab.com/demo/repo.git' }
+  let(:lfs_endpoint) { "#{import_url}/info/lfs/objects/batch" }
+  let!(:project) { create(:project, import_url: import_url) }
+  let(:new_oids) { { 'oid1' => 123, 'oid2' => 125 } }
+  let(:remote_uri) { URI.parse(lfs_endpoint) }
+
+  let(:objects_response) do
+    body = new_oids.map do |oid, size|
+      {
+        'oid' => oid,
+        'size' => size,
+        'actions' => {
+          'download' => { 'href' => "#{import_url}/gitlab-lfs/objects/#{oid}" }
+        }
+      }
+    end
+
+    Struct.new(:success?, :objects).new(true, body)
+  end
+
+  let(:invalid_object_response) do
+    [
+      'oid' => 'whatever',
+      'size' => 123
+    ]
+  end
+
+  subject { described_class.new(project, remote_uri: remote_uri) }
+
+  before do
+    allow(project).to receive(:lfs_enabled?).and_return(true)
+    allow(Gitlab::HTTP).to receive(:post).and_return(objects_response)
+  end
+
+  describe '#execute' do
+    it 'retrieves each download link of every non existent lfs object' do
+      subject.execute(new_oids).each do |oid, link|
+        expect(link).to eq "#{import_url}/gitlab-lfs/objects/#{oid}"
+      end
+    end
+
+    context 'credentials' do
+      context 'when the download link and the lfs_endpoint have the same host' do
+        context 'when lfs_endpoint has credentials' do
+          let(:import_url) { 'http://user:password@www.gitlab.com/demo/repo.git' }
+
+          it 'adds credentials to the download_link' do
+            result = subject.execute(new_oids)
+
+            result.each do |oid, link|
+              expect(link.starts_with?('http://user:password@')).to be_truthy
+            end
+          end
+        end
+
+        context 'when lfs_endpoint does not have any credentials' do
+          it 'does not add any credentials' do
+            result = subject.execute(new_oids)
+
+            result.each do |oid, link|
+              expect(link.starts_with?('http://user:password@')).to be_falsey
+            end
+          end
+        end
+      end
+
+      context 'when the download link and the lfs_endpoint have different hosts' do
+        let(:import_url_with_credentials) { 'http://user:password@www.otherdomain.com/demo/repo.git' }
+        let(:lfs_endpoint) { "#{import_url_with_credentials}/info/lfs/objects/batch" }
+
+        it 'downloads without any credentials' do
+          result = subject.execute(new_oids)
+
+          result.each do |oid, link|
+            expect(link.starts_with?('http://user:password@')).to be_falsey
+          end
+        end
+      end
+    end
+  end
+
+  describe '#get_download_links' do
+    it 'raise errorif request fails' do
+      allow(Gitlab::HTTP).to receive(:post).and_return(Struct.new(:success?, :message).new(false, 'Failed request'))
+
+      expect { subject.send(:get_download_links, new_oids) }.to raise_error(described_class::DownloadLinksError)
+    end
+  end
+
+  describe '#parse_response_links' do
+    it 'does not add oid entry if href not found' do
+      expect(Rails.logger).to receive(:error).with("Link for Lfs Object with oid whatever not found or invalid.")
+
+      result = subject.send(:parse_response_links, invalid_object_response)
+
+      expect(result).to be_empty
+    end
+  end
+end
diff --git a/spec/services/projects/lfs_pointers/lfs_download_service_spec.rb b/spec/services/projects/lfs_pointers/lfs_download_service_spec.rb
new file mode 100644
index 00000000000..6af5bfc7689
--- /dev/null
+++ b/spec/services/projects/lfs_pointers/lfs_download_service_spec.rb
@@ -0,0 +1,69 @@
+require 'spec_helper'
+
+describe Projects::LfsPointers::LfsDownloadService do
+  let(:project) { create(:project) }
+  let(:oid) { '9e548e25631dd9ce6b43afd6359ab76da2819d6a5b474e66118c7819e1d8b3e8' }
+  let(:download_link) { "http://gitlab.com/#{oid}" }
+  let(:lfs_content) do
+    <<~HEREDOC
+    whatever
+    HEREDOC
+  end
+
+  subject { described_class.new(project) }
+
+  before do
+    allow(project).to receive(:lfs_enabled?).and_return(true)
+    WebMock.stub_request(:get, download_link).to_return(body: lfs_content)
+  end
+
+  describe '#execute' do
+    context 'when file download succeeds' do
+      it 'a new lfs object is created' do
+        expect { subject.execute(oid, download_link) }.to change { LfsObject.count }.from(0).to(1)
+      end
+
+      it 'has the same oid' do
+        subject.execute(oid, download_link)
+
+        expect(LfsObject.first.oid).to eq oid
+      end
+
+      it 'stores the content' do
+        subject.execute(oid, download_link)
+
+        expect(File.read(LfsObject.first.file.file.file)).to eq lfs_content
+      end
+    end
+
+    context 'when file download fails' do
+      it 'no lfs object is created' do
+        expect { subject.execute(oid, download_link) }.to change { LfsObject.count }
+      end
+    end
+
+    context 'when credentials present' do
+      let(:download_link_with_credentials) { "http://user:password@gitlab.com/#{oid}" }
+
+      before do
+        WebMock.stub_request(:get, download_link).with(headers: { 'Authorization' => 'Basic dXNlcjpwYXNzd29yZA==' }).to_return(body: lfs_content)
+      end
+
+      it 'the request adds authorization headers' do
+        subject.execute(oid, download_link_with_credentials)
+      end
+    end
+
+    context 'when an lfs object with the same oid already exists'  do
+      before do
+        create(:lfs_object, oid: 'oid')
+      end
+
+      it 'does not download the file' do
+        expect(subject).not_to receive(:download_and_save_file)
+
+        subject.execute('oid', download_link)
+      end
+    end
+  end
+end
diff --git a/spec/services/projects/lfs_pointers/lfs_import_service_spec.rb b/spec/services/projects/lfs_pointers/lfs_import_service_spec.rb
new file mode 100644
index 00000000000..5a75fb38dec
--- /dev/null
+++ b/spec/services/projects/lfs_pointers/lfs_import_service_spec.rb
@@ -0,0 +1,146 @@
+require 'spec_helper'
+
+describe Projects::LfsPointers::LfsImportService do
+  let(:import_url) { 'http://www.gitlab.com/demo/repo.git' }
+  let(:default_endpoint) { "#{import_url}/info/lfs/objects/batch"}
+  let(:group) { create(:group, lfs_enabled: true)}
+  let!(:project) { create(:project, namespace: group, import_url: import_url, lfs_enabled: true) }
+  let!(:lfs_objects_project) { create_list(:lfs_objects_project, 2, project: project) }
+  let!(:existing_lfs_objects) { LfsObject.pluck(:oid, :size).to_h }
+  let(:oids) { { 'oid1' => 123, 'oid2' => 125 } }
+  let(:oid_download_links) { { 'oid1' => "#{import_url}/gitlab-lfs/objects/oid1", 'oid2' => "#{import_url}/gitlab-lfs/objects/oid2" } }
+  let(:all_oids) { existing_lfs_objects.merge(oids) }
+  let(:remote_uri) { URI.parse(lfs_endpoint) }
+
+  subject { described_class.new(project) }
+
+  before do
+    allow(project.repository).to receive(:lfsconfig_for).and_return(nil)
+    allow(Gitlab.config.lfs).to receive(:enabled).and_return(true)
+    allow_any_instance_of(Projects::LfsPointers::LfsListService).to receive(:execute).and_return(all_oids)
+  end
+
+  describe '#execute' do
+    context 'when no lfs pointer is linked' do
+      before do
+        allow_any_instance_of(Projects::LfsPointers::LfsLinkService).to receive(:execute).and_return([])
+        allow_any_instance_of(Projects::LfsPointers::LfsDownloadLinkListService).to receive(:execute).and_return(oid_download_links)
+        expect(Projects::LfsPointers::LfsDownloadLinkListService).to receive(:new).with(project, remote_uri: URI.parse(default_endpoint)).and_call_original
+      end
+
+      it 'retrieves all lfs pointers in the project repository' do
+        expect_any_instance_of(Projects::LfsPointers::LfsListService).to receive(:execute)
+
+        subject.execute
+      end
+
+      it 'links existent lfs objects to the project' do
+        expect_any_instance_of(Projects::LfsPointers::LfsLinkService).to receive(:execute)
+
+        subject.execute
+      end
+
+      it 'retrieves the download links of non existent objects' do
+        expect_any_instance_of(Projects::LfsPointers::LfsDownloadLinkListService).to receive(:execute).with(all_oids)
+
+        subject.execute
+      end
+    end
+
+    context 'when some lfs objects are linked' do
+      before do
+        allow_any_instance_of(Projects::LfsPointers::LfsLinkService).to receive(:execute).and_return(existing_lfs_objects.keys)
+        allow_any_instance_of(Projects::LfsPointers::LfsDownloadLinkListService).to receive(:execute).and_return(oid_download_links)
+      end
+
+      it 'retrieves the download links of non existent objects' do
+        expect_any_instance_of(Projects::LfsPointers::LfsDownloadLinkListService).to receive(:execute).with(oids)
+
+        subject.execute
+      end
+    end
+
+    context 'when all lfs objects are linked' do
+      before do
+        allow_any_instance_of(Projects::LfsPointers::LfsLinkService).to receive(:execute).and_return(all_oids.keys)
+        allow_any_instance_of(Projects::LfsPointers::LfsDownloadLinkListService).to receive(:execute)
+      end
+
+      it 'retrieves no download links' do
+        expect_any_instance_of(Projects::LfsPointers::LfsDownloadLinkListService).to receive(:execute).with({}).and_call_original
+
+        expect(subject.execute).to be_empty
+      end
+    end
+
+    context 'when lfsconfig file exists' do
+      before do
+        allow(project.repository).to receive(:lfsconfig_for).and_return("[lfs]\n\turl = #{lfs_endpoint}\n")
+      end
+
+      context 'when url points to the same import url host' do
+        let(:lfs_endpoint) { "#{import_url}/different_endpoint" }
+        let(:service) { double }
+
+        before do
+          allow(service).to receive(:execute)
+        end
+        it 'downloads lfs object using the new endpoint' do
+          expect(Projects::LfsPointers::LfsDownloadLinkListService).to receive(:new).with(project, remote_uri: remote_uri).and_return(service)
+
+          subject.execute
+        end
+
+        context 'when import url has credentials' do
+          let(:import_url) { 'http://user:password@www.gitlab.com/demo/repo.git'}
+
+          it 'adds the credentials to the new endpoint' do
+            expect(Projects::LfsPointers::LfsDownloadLinkListService)
+              .to receive(:new).with(project, remote_uri: URI.parse("http://user:password@www.gitlab.com/demo/repo.git/different_endpoint"))
+              .and_return(service)
+
+            subject.execute
+          end
+
+          context 'when url has its own credentials' do
+            let(:lfs_endpoint) { "http://user1:password1@www.gitlab.com/demo/repo.git/different_endpoint" }
+
+            it 'does not add the import url credentials' do
+              expect(Projects::LfsPointers::LfsDownloadLinkListService)
+                .to receive(:new).with(project, remote_uri: remote_uri)
+                .and_return(service)
+
+              subject.execute
+            end
+          end
+        end
+      end
+
+      context 'when url points to a third party service' do
+        let(:lfs_endpoint) { 'http://third_party_service.com/info/lfs/objects/' }
+
+        it 'disables lfs from the project' do
+          expect(project.lfs_enabled?).to be_truthy
+
+          subject.execute
+
+          expect(project.lfs_enabled?).to be_falsey
+        end
+
+        it 'does not download anything' do
+          expect_any_instance_of(Projects::LfsPointers::LfsListService).not_to receive(:execute)
+
+          subject.execute
+        end
+      end
+    end
+  end
+
+  describe '#default_endpoint_uri' do
+    let(:import_url) { 'http://www.gitlab.com/demo/repo' }
+
+    it 'adds suffix .git if the url does not have it' do
+      expect(subject.send(:default_endpoint_uri).path).to match(/repo.git/)
+    end
+  end
+end
diff --git a/spec/services/projects/lfs_pointers/lfs_link_service_spec.rb b/spec/services/projects/lfs_pointers/lfs_link_service_spec.rb
new file mode 100644
index 00000000000..b7b153655db
--- /dev/null
+++ b/spec/services/projects/lfs_pointers/lfs_link_service_spec.rb
@@ -0,0 +1,33 @@
+require 'spec_helper'
+
+describe Projects::LfsPointers::LfsLinkService do
+  let!(:project) { create(:project, lfs_enabled: true) }
+  let!(:lfs_objects_project) { create_list(:lfs_objects_project, 2, project: project) }
+  let(:new_oids) { { 'oid1' => 123, 'oid2' => 125 } }
+  let(:all_oids) { LfsObject.pluck(:oid, :size).to_h.merge(new_oids) }
+  let(:new_lfs_object) { create(:lfs_object) }
+  let(:new_oid_list) { all_oids.merge(new_lfs_object.oid => new_lfs_object.size) }
+
+  subject { described_class.new(project) }
+
+  before do
+    allow(project).to receive(:lfs_enabled?).and_return(true)
+  end
+
+  describe '#execute' do
+    it 'links existing lfs objects to the project' do
+      expect(project.all_lfs_objects.count).to eq 2
+
+      linked = subject.execute(new_oid_list.keys)
+
+      expect(project.all_lfs_objects.count).to eq 3
+      expect(linked.size).to eq 3
+    end
+
+    it 'returns linked oids' do
+      linked = lfs_objects_project.map(&:lfs_object).map(&:oid) << new_lfs_object.oid
+
+      expect(subject.execute(new_oid_list.keys)).to eq linked
+    end
+  end
+end
diff --git a/spec/workers/gitlab/github_import/stage/import_lfs_objects_worker_spec.rb b/spec/workers/gitlab/github_import/stage/import_lfs_objects_worker_spec.rb
new file mode 100644
index 00000000000..b19884d7991
--- /dev/null
+++ b/spec/workers/gitlab/github_import/stage/import_lfs_objects_worker_spec.rb
@@ -0,0 +1,28 @@
+require 'spec_helper'
+
+describe Gitlab::GithubImport::Stage::ImportLfsObjectsWorker do
+  let(:project) { create(:project) }
+  let(:worker) { described_class.new }
+
+  describe '#import' do
+    it 'imports all the lfs objects' do
+      importer = double(:importer)
+      waiter = Gitlab::JobWaiter.new(2, '123')
+
+      expect(Gitlab::GithubImport::Importer::LfsObjectsImporter)
+        .to receive(:new)
+        .with(project, nil)
+        .and_return(importer)
+
+      expect(importer)
+        .to receive(:execute)
+        .and_return(waiter)
+
+      expect(Gitlab::GithubImport::AdvanceStageWorker)
+        .to receive(:perform_async)
+        .with(project.id, { '123' => 2 }, :finish)
+
+      worker.import(project)
+    end
+  end
+end
diff --git a/spec/workers/gitlab/github_import/stage/import_notes_worker_spec.rb b/spec/workers/gitlab/github_import/stage/import_notes_worker_spec.rb
index 098d2d55386..94cff9e4e80 100644
--- a/spec/workers/gitlab/github_import/stage/import_notes_worker_spec.rb
+++ b/spec/workers/gitlab/github_import/stage/import_notes_worker_spec.rb
@@ -21,7 +21,7 @@ describe Gitlab::GithubImport::Stage::ImportNotesWorker do
 
       expect(Gitlab::GithubImport::AdvanceStageWorker)
         .to receive(:perform_async)
-        .with(project.id, { '123' => 2 }, :finish)
+        .with(project.id, { '123' => 2 }, :lfs_objects)
 
       worker.import(client, project)
     end
-- 
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