01-03-2018
Ok guys, I figured it out.
It was a global umask setting that got changed during an outage we had a couple weeks ago. Apparently one of the SAs changed the global umask to 0666 trying to fix an FTP permissions issue. So anyone who wasn't overriding that setting was getting all the permissions stripped from any new file being created.
I noticed that any new file that I touched had zero permissions, so any temp file created by VI wasn't able to read or write. So we've reset the global umask and everyone is good to go now.
I really appreciate the time and effort everyone put in.
Thanks!
Shawn
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UMASK(3) 1 UMASK(3)
umask - Changes the current umask
SYNOPSIS
int umask ([int $mask])
DESCRIPTION
umask(3) sets PHP's umask to $mask & 0777 and returns the old umask. When PHP is being used as a server module, the umask is restored when
each request is finished.
PARAMETERS
o $mask
- The new umask.
RETURN VALUES
umask(3) without arguments simply returns the current umask otherwise the old umask is returned.
EXAMPLES
Example #1
umask(3) example
<?php
$old = umask(0);
chmod("/path/some_dir/some_file.txt", 0755);
umask($old);
// Checking
if ($old != umask()) {
die('An error occurred while changing back the umask');
}
?>
NOTES
Note
Avoid using this function in multithreaded webservers. It is better to change the file permissions with chmod(3) after creating the
file. Using umask(3) can lead to unexpected behavior of concurrently running scripts and the webserver itself because they all use
the same umask.
PHP Documentation Group UMASK(3)