74 lines
1.8 KiB
Nix
74 lines
1.8 KiB
Nix
{ pkgs, inputs, ... }:
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{
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imports = [ inputs.impermanence.nixosModules.impermanence ];
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environment.persistence = {
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"/persist" = {
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directories = [ "/var/lib/nixos" ];
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files = [
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"/etc/machine-id"
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"/etc/ssh/ssh_host_ed25519_key"
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"/etc/ssh/ssh_host_ed25519_key.pub"
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"/etc/ssh/ssh_host_rsa_key"
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"/etc/ssh/ssh_host_rsa_key.pub"
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];
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};
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};
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fileSystems."/".options = [
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"compress=zstd"
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"noatime"
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];
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fileSystems."/nix".options = [
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"compress=zstd"
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"noatime"
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];
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fileSystems."/persist".options = [
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"compress=zstd"
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"noatime"
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];
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fileSystems."/persist".neededForBoot = true;
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fileSystems."/var/log".options = [
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"compress=zstd"
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"noatime"
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];
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fileSystems."/var/log".neededForBoot = true;
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users.mutableUsers = false;
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# rollback results in sudo lectures after each reboot
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security.sudo.extraConfig = ''
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Defaults lecture = never
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'';
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# needed for allowOther in the home-manager impermanence config
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programs.fuse.userAllowOther = true;
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# reset / at each boot
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# Note `lib.mkBefore` is used instead of `lib.mkAfter` here.
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boot.initrd.postDeviceCommands = pkgs.lib.mkBefore ''
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mkdir /mnt
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mount /dev/mapper/luksroot /mnt
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if [[ -e /mnt/root ]]; then
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mkdir -p /mnt/old_roots
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timestamp=$(date --date="@$(stat -c %Y /mnt/root)" "+%Y-%m-%-d_%H:%M:%S")
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mv /mnt/root "/mnt/old_roots/$timestamp"
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fi
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delete_subvolume_recursively() {
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IFS=$'\n'
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for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
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delete_subvolume_recursively "/mnt/$i"
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done
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btrfs subvolume delete "$1"
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}
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for i in $(find /mnt/old_roots/ -maxdepth 1 -mtime +30); do
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delete_subvolume_recursively "$i"
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done
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btrfs subvolume create /mnt/root
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umount /mnt
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'';
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}
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