changed method of pulling hostname to be more universal

[ClayShoaf]

I was getting errors when trying to install/run umbrel on an Arch system. It appears that hostname is an Ubuntu-specific command (or at least it doesn't exist in Arch). This should allow Umbrel to be compatible with more Linux systems, as long as they have all of the dependencies installed.

[nevets963]

Thanks for the PR! I just took a look at the hierarchy to determine the hostname (as there is also /etc/hostname) and it looks like /proc/sys/kernel/hostname is most ideal.

Would you mind also patching up:

• https://github.com/getumbrel/umbrel/blob/master/scripts/app#L109
• https://github.com/getumbrel/umbrel/blob/master/scripts/update/01-run.sh#L165

[ClayShoaf]

Alright, I think I did that right. Still figuring out the github interface.

When I grepped, I should have left off the trailing parenthesis instead of doing grep -irI '$(hostname)'. That should be all of them now.

[ClayShoaf]

Ah crud. I didn't realize I still had this open when I deleted my repo.