Files
nix-config/modules/nixos/impermanence/default.nix
2025-08-23 14:34:45 -05:00

259 lines
7.6 KiB
Nix
Executable File

{
config,
lib,
namespace,
...
}:
with lib;
let
cfg = config.${namespace}.impermanence;
in
{
imports = [ ./options.nix ];
config = mkIf cfg.enable {
environment.persistence."/nix/persist/system" = {
hideMounts = true;
directories = [
"/var/lib/bluetooth"
"/var/lib/iwd"
"/var/lib/nixos"
"/var/lib/libvirt"
"/var/lib/waydroid"
"/var/lib/systemd/coredump"
"/etc/NetworkManager/system-connections"
"/var/lib/tailscale"
"/var/lib/homeassistant"
"/var/lib/mosquitto"
"/var/lib/music-assistant"
"/var/lib/postgresql"
"/var/lib/zigbee2mqtt"
{
directory = "/var/lib/colord";
user = "colord";
group = "colord";
mode = "u=rwx,g=rx,o=";
}
{
directory = "/etc/nix";
user = "root";
group = "root";
mode = "u=rwx,g=rx,o=rx";
}
{
directory = "/var/lib/private/authentik/media";
user = "authentik";
group = "authentik";
mode = "u=rwx,g=,o=";
}
{
directory = "/var/lib/private";
mode = "u=rwx,g=rx,o=";
}
{
directory = "/media/nas";
user = "nas-apps";
group = "jallen-nas";
mode = "u=rwx,g=rx,o=rx";
}
{
directory = "/var/lib/crowdsec";
user = "crowdsec";
group = "crowdsec";
mode = "u=rwx,g=rwx,o=rx";
}
{
directory = "/plugins-storage";
user = "traefik";
group = "traefik";
mode = "u=rwx,g=rwx,o=rx";
}
];
files = [
"/etc/machine-id"
];
};
security.sudo.extraConfig = ''
# rollback results in sudo lectures after each reboot
Defaults lecture = never
'';
# system.activationScripts = {
# "var-lib-private-permissions" = {
# deps = [ "createPersistentStorageDirs" ];
# text = ''
# mkdir -p /var/lib/private
# chmod 0700 /var/lib/private
# '';
# };
# };
# boot.initrd.systemd.services.rootfs-cleanup = {
# description = "Clean file system root";
# wantedBy = [
# "initrd.target"
# ];
# after = [
# "initrd-root-device.target"
# ];
# before = [
# "sysroot.mount"
# ];
# unitConfig.DefaultDependencies = "no";
# serviceConfig.Type = "oneshot";
# script =
# if (hasAttr "/" config.fileSystems) && (config.fileSystems."/".fsType == "btrfs") then
# ''
# # workaround for machines without working rtc battery
# # The time may not yet be correctly set, so wait until it is
# if [[ $(date '+%s') -lt 1730469314 ]]; then
# sleep 30 # this should hopefully be enough
# fi
# mkdir /btrfs_tmp
# mount ${config.fileSystems."/".device} -t btrfs /btrfs_tmp
# if [[ -e /btrfs_tmp/root ]]; then
# mkdir -p /btrfs_tmp/old_roots
# timestamp=$(date --date="@$(stat -c %X /btrfs_tmp/root)" "+%Y-%m-%d_%H:%M:%S")
# mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
# fi
# delete_subvolume_recursively() {
# IFS=$'\n'
# for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
# delete_subvolume_recursively "/btrfs_tmp/$i"
# done
# btrfs subvolume delete "$1" || rm -rf "$1"
# }
# for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -atime +30); do
# delete_subvolume_recursively "$i"
# done
# btrfs subvolume create /btrfs_tmp/root
# umount /btrfs_tmp
# ''
# else if (hasAttr "/" config.fileSystems) && (config.fileSystems."/".fsType == "bcachefs") then
# ''
# # workaround for machines without working rtc battery
# # The time may not yet be correctly set, so wait until it is
# if [[ $(date '+%s') -lt 1730469314 ]]; then
# sleep 30 # this should hopefully be enough
# fi
# if [[ -e /root_tmp/root ]]; then
# mkdir -p /root_tmp/old_roots
# timestamp=$(date --date="@$(stat -c %X /root_tmp/root)" "+%Y-%m-%d_%H:%M:%S")
# mv /root_tmp/root "/root_tmp/old_roots/$timestamp"
# fi
# for i in $(find /root_tmp/old_roots/ -maxdepth 1 -atime +30); do
# bcachefs subvolume delete $i
# done
# bcachefs subvolume create /root_tmp/root
# ''
# else
# # For tmpfs or other filesystems, do nothing
# "";
# };
# assertions = [
# {
# assertion = hasAttr "/" config.fileSystems;
# message = "To use impermanence, you need to define a root volume";
# }
# {
# assertion =
# if hasAttr "/" config.fileSystems then
# config.fileSystems."/".fsType == "btrfs"
# || config.fileSystems."/".fsType == "bcachefs"
# || config.fileSystems."/".fsType == "tmpfs"
# else
# false;
# message = "rootfs must be btrfs, bcachefs, or tmpfs; not " + config.fileSystems."/".fsType;
# }
# {
# assertion =
# if
# hasAttr "/" config.fileSystems
# && (config.fileSystems."/".fsType == "btrfs" || config.fileSystems."/".fsType == "bcachefs")
# then
# any (
# t: t == "subvol=root" || t == "subvol=/root" || t == "X-mount.subdir=root"
# ) config.fileSystems."/".options
# else
# true;
# message = "btrfs or bcachefs rootfs must mount subvolume root";
# }
# {
# assertion = !config.boot.isContainer;
# message = "impermanence is not supported in containers";
# }
# ];
# environment.persistence.${cfg.persistencePath} = {
# hideMounts = true;
# directories = [
# "/var/lib/bluetooth"
# "/var/lib/iwd"
# "/var/lib/nixos"
# "/var/lib/libvirt"
# "/var/lib/waydroid"
# "/var/lib/systemd/coredump"
# "/etc/NetworkManager/system-connections"
# "/var/lib/tailscale"
# "/var/lib/homeassistant"
# "/var/lib/mosquitto"
# "/var/lib/music-assistant"
# "/var/lib/postgresql"
# "/var/lib/zigbee2mqtt"
# {
# directory = "/var/lib/colord";
# user = "colord";
# group = "colord";
# mode = "u=rwx,g=rx,o=";
# }
# {
# directory = "/etc/nix";
# user = "root";
# group = "root";
# mode = "u=rwx,g=rx,o=rx";
# }
# {
# directory = "/var/lib/private/authentik/media";
# user = "authentik";
# group = "authentik";
# mode = "u=rwx,g=,o=";
# }
# {
# directory = "/var/lib/private";
# mode = "u=rwx,g=rx,o=";
# }
# {
# directory = "/media/nas";
# user = "nas-apps";
# group = "jallen-nas";
# mode = "u=rwx,g=rx,o=rx";
# }
# {
# directory = "/var/lib/crowdsec";
# user = "crowdsec";
# group = "crowdsec";
# mode = "u=rwx,g=rwx,o=rx";
# }
# {
# directory = "/plugins-storage";
# user = "traefik";
# group = "traefik";
# mode = "u=rwx,g=rwx,o=rx";
# }
# ];
# files = [
# "/etc/machine-id"
# ];
# };
};
}