ignore rename errors on sftp distribute

app/logical/remote_file_manager.rb

@@ -9,12 +9,18 @@ class RemoteFileManager
 
   def distribute
     uuid = SecureRandom.uuid
-    temp_path = "/tmp/rfm-#{Danbooru.config.hostname}-#{uuid}"
+    temp_path = "/tmp/rfm-#{Danbooru.config.server_host}-#{uuid}"
 
     Danbooru.config.other_server_hosts.each do |hostname|
       Net::SFTP.start(hostname, Danbooru.config.remote_server_login) do |ftp|
         ftp.upload!(path, temp_path)
-        ftp.rename!(temp_path, path)
+        begin
+          ftp.rename!(temp_path, path)
+        rescue Net::SFTP::StatusException
+          # this typically means the file already exists
+          # so just clean up
+          ftp.remove(temp_path)
+        end
       end
     end
   end