How to get rid of /tmp?

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1

Hello, people!

In my local setup, I have /tmp in a separate partition.

Now I want to get rid of that partition, integrating it in the / system.

But, obviously, /tmp is occupied; then I’m not able to unmount it.

Question: how can I get rid of /tmp that way?

2

Can you reboot? You could try reconfiguring how it sets up the mounts in the first place, then reboot the machine.

3

This is one of the easiest approaches. Just remove the /tmp mountpoint from hardware-configuration.nix, use sudo nixos-rebuild boot, then reboot. Dunno if it’ll automatically create a /tmp directory (though I’d wager it would); but if not you can bind-mount / to some place and make it before you reboot.

sudo mount --bind / /mnt
sudo mkdir /mnt/tmp
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4

Ah, now there is a problem: /tmp is blocking the nixos-rebuild.

5

How is it blocking nixos-rebuild? The advice given causes no meaningful change to your running system, it only prepares the system to have the correct setup after reboot. Unless your existing /tmp dir is already unusable for some reason?

6

Because of some strange reason, e2fsprogs doesn’t compile. Or more precisely, it fails the test phase. The reason is something related to hugefile support and /tmp…

For now, I rebooted the system in “1” mode, unmounted /tmp and installed e2fsprogs. Now the system is being built.