Hello, I promize you another question related to my sbuild property :) So this property generate at the end a chroot in a file /var/lib/sbuild/jessie-i386.tar.gz Since this process take a lot's of time, I do not want to run this process each time. I would like to process this property only if the file does not exists. I found the flagFile property but I do not think that it is the right answer to my problem. I just want to express that a file is the result of a property and no need to re-run the proerty if this file exists. Cheers