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In this system, SFTP will be used to upload large video files to a specific directory on the server. I am writing a PHP script that will be used to copy completely uploaded files to another directory.
My question is, what is a good way to tell if a file is completely uploaded or not? I considered taking note of the file size, sleeping the script for a few seconds, reading the size again, and comparing the two numbers. But this seems very kludgy.
In theory, in case you are allowed to run system commands from PHP you can try to get the pids of your sftp server processes with pidof command and then use lsof output to check if open file descriptors exist for the currently checked upload file.