change remote file manager's upload to use a temp path + rename #2569

app/logical/remote_file_manager.rb

@@ -1,3 +1,5 @@
+require 'securerandom'
+
 class RemoteFileManager
   attr_reader :path
 
@@ -6,9 +8,13 @@ class RemoteFileManager
   end
 
   def distribute
+    uuid = SecureRandom.uuid
+    temp_path = "/tmp/rfm-#{Danbooru.config.hostname}-#{uuid}"
+
     Danbooru.config.other_server_hosts.each do |hostname|
       Net::SFTP.start(hostname, Danbooru.config.remote_server_login) do |ftp|
-        ftp.upload!(path, path)
+        ftp.upload!(path, temp_path)
+        ftp.rename!(temp_path, path)
       end
     end
   end