1 files changed, 18 insertions, 1 deletions
diff --git a/lib/gitlab/gfm/uploads_rewriter.rb b/lib/gitlab/gfm/uploads_rewriter.rb
index abc8c8c55e6..8fab5489616 100644
--- a/lib/gitlab/gfm/uploads_rewriter.rb
+++ b/lib/gitlab/gfm/uploads_rewriter.rb
@@ -1,3 +1,5 @@
+require 'fileutils'
+
 module Gitlab
   module Gfm
     ##
@@ -22,7 +24,9 @@ module Gitlab
           return markdown unless file.try(:exists?)
 
           new_uploader = FileUploader.new(target_project)
-          new_uploader.store!(file)
+          with_link_in_tmp_dir(file.file) do |open_tmp_file|
+            new_uploader.store!(open_tmp_file)
+          end
           new_uploader.to_markdown
         end
       end
@@ -46,6 +50,19 @@ module Gitlab
         uploader.retrieve_from_store!(file)
         uploader.file
       end
+
+      # Because the uploaders use 'move_to_store' we must have a temporary
+      # file that is allowed to be (re)moved.
+      def with_link_in_tmp_dir(file)
+        dir = Dir.mktmpdir('UploadsRewriter', File.dirname(file))
+        # The filename matters to Carrierwave so we make sure to preserve it
+        tmp_file = File.join(dir, File.basename(file))
+        File.link(file, tmp_file)
+        # Open the file to placate Carrierwave
+        File.open(tmp_file) { |open_file| yield open_file }
+      ensure
+        FileUtils.rm_rf(dir)
+      end
     end
   end
 end