{ config, lib, ... }: let cfg = config.boot.tmp; in { imports = [ (lib.mkRenamedOptionModule [ "boot" "cleanTmpDir" ] [ "boot" "tmp" "cleanOnBoot" ]) (lib.mkRenamedOptionModule [ "boot" "tmpOnTmpfs" ] [ "boot" "tmp" "useTmpfs" ]) (lib.mkRenamedOptionModule [ "boot" "tmpOnTmpfsSize" ] [ "boot" "tmp" "tmpfsSize" ]) ]; options = { boot.tmp = { cleanOnBoot = lib.mkOption { type = lib.types.bool; default = false; description = '' Whether to delete all files in {file}`/tmp` during boot. ''; }; tmpfsSize = lib.mkOption { type = lib.types.oneOf [ lib.types.str lib.types.ints.positive ]; default = "50%"; description = '' Size of tmpfs in percentage. Percentage is defined by systemd. ''; }; useTmpfs = lib.mkOption { type = lib.types.bool; default = false; description = '' Whether to mount a tmpfs on {file}`/tmp` during boot. ::: {.note} Large Nix builds can fail if the mounted tmpfs is not large enough. In such a case either increase the tmpfsSize or disable this option. ::: ''; }; }; }; config = { # When changing remember to update /tmp mount in virtualisation/qemu-vm.nix systemd.mounts = lib.mkIf cfg.useTmpfs [ { what = "tmpfs"; where = "/tmp"; type = "tmpfs"; mountConfig.Options = lib.concatStringsSep "," [ "mode=1777" "strictatime" "rw" "nosuid" "nodev" "size=${toString cfg.tmpfsSize}" ]; } ]; systemd.tmpfiles.rules = lib.optional cfg.cleanOnBoot "D! /tmp 1777 root root"; }; }