nixpkgs/nixos/modules/system/boot/tmp.nix

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{ config, lib, ... }:
with lib;
{
###### interface
options = {
boot.cleanTmpDir = mkOption {
type = types.bool;
default = false;
description = ''
Whether to delete all files in <filename>/tmp</filename> during boot.
'';
};
boot.tmpOnTmpfs = mkOption {
type = types.bool;
default = false;
description = ''
Whether to mount a tmpfs on <filename>/tmp</filename> during boot.
'';
};
};
###### implementation
config = {
systemd.mounts = mkIf config.boot.tmpOnTmpfs [
{
what = "tmpfs";
where = "/tmp";
type = "tmpfs";
mountConfig.Options = [ "mode=1777" "strictatime" "rw" "nosuid" "nodev" "size=50%" ];
}
];
systemd.tmpfiles.rules = optional config.boot.cleanTmpDir "D! /tmp 1777 root root";
};
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}