Installing MinimServer on Linux using su

[simbun]

Having thought about it, you're probably falling back on logname because you're trying to get the UID from within a SUDO call.
I tried to do something like this a while ago and I couldn't find a way to expose the Real UID from the shell as opposed to the Effective UID either, which was maddening.
I fell back on using $SUDO_USER, which should be ok if you're controlling how it's being called (doing the sudo call yourself), but it doesn't work in all scenarios ("sudo su - <another user>" from memory).

Again, no idea how this works across distributions, but it can't hurt if it's just an additional check before logname.