Merge branch 'fix/gitlab-import-project-file-fix' into 'master'

Fix temp file being deleted after the request while importing a GitLab project

Fixes https://gitlab.com/gitlab-com/infrastructure/issues/151

In production, the temporary uploaded file is getting deleted straight after the request so the Sidekiq worker is unable to find it in `/tmp`

Also, improved erroring/logging of this situation.

See merge request !4894

lib/gitlab/import_export/file_importer.rb

@@ -23,7 +23,11 @@ module Gitlab
       private
 
       def decompress_archive
-        untar_zxf(archive: @archive_file, dir: @shared.export_path)
+        result = untar_zxf(archive: @archive_file, dir: @shared.export_path)
+
+        raise Projects::ImportService::Error.new("Unable to decompress #{@archive_file} into #{@shared.export_path}") unless result
+
+        true
       end
     end
   end

lib/gitlab/import_export/importer.rb

@@ -10,17 +10,22 @@ module Gitlab
       end
 
       def execute
-        Gitlab::ImportExport::FileImporter.import(archive_file: @archive_file,
-                                                  shared: @shared)
-        if check_version! && [project_tree, repo_restorer, wiki_restorer, uploads_restorer].all?(&:restore)
+        if import_file && check_version! && [project_tree, repo_restorer, wiki_restorer, uploads_restorer].all?(&:restore)
           project_tree.restored_project
         else
           raise Projects::ImportService::Error.new(@shared.errors.join(', '))
         end
+
+        remove_import_file
       end
 
       private
 
+      def import_file
+        Gitlab::ImportExport::FileImporter.import(archive_file: @archive_file,
+                                                  shared: @shared)
+      end
+
       def check_version!
         Gitlab::ImportExport::VersionChecker.check!(shared: @shared)
       end
@@ -59,6 +64,10 @@ module Gitlab
       def wiki_repo_path
         File.join(@shared.export_path, 'project.wiki.bundle')
       end
+
+      def remove_import_file
+        FileUtils.rm_rf(@archive_file)
+      end
     end
   end
 end