120 lines
3.5 KiB
Nix
120 lines
3.5 KiB
Nix
{
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lib,
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pkgs,
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inputs,
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namespace,
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system,
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target,
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format,
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virtual,
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systems,
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config,
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...
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}:
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with lib;
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with lib.${namespace}; let
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cfg = config.${namespace}.impermanence;
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persist = cfg.persistentStorage;
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rootIsBtrfs = config.fileSystems."/".fsType == "btrfs";
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in {
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options.${namespace}.impermanence = with types; {
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enable = mkBoolOpt false "Enable impermanence";
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persistentStorage = lib.mkOption {
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type = lib.types.path;
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default = "/persist";
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description = ''
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Volume with persistent information, that won't be destroyed after reboot
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'';
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};
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};
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config = mkIf cfg.enable {
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fileSystems.${persist}.neededForBoot = true;
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environment.persistence."${persist}/system" = {
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hideMounts = true;
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directories = [
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"/etc/ssh"
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"/var/lib/sbctl"
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"/etc/nixos"
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"/var/log"
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"/var/lib/bluetooth"
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"/var/lib/nixos"
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"/var/lib/flatpak"
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"/var/lib/zerotier-one"
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"/var/lib/systemd/coredump"
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"/var/lib/systemd/timers"
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"/var/lib/acme"
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"/var/lib/upower"
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"/var/lib/power-profiles-daemon"
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#"/var/lib/conduwuit"
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"/etc/NetworkManager/system-connections"
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{
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directory = "/var/lib/colord";
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user = "colord";
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group = "colord";
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mode = "u=rwx,g=rx,o=";
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}
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];
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files = [
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"/etc/machine-id"
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{
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file = "/var/keys/secret_file";
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parentDirectory = {mode = "u=rwx,g=,o=";};
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}
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];
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};
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systemd.tmpfiles.rules = [
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"d ${persist}/home/ 0777 root root -" # /persist/home created, owned by root
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"d ${persist}/ollama/ 0755 ollama ollama"
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"d ${persist}/open-webui/ 0755 ollama ollama"
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"d ${persist}/conduwuit/ 0755 conduwuit conduwuit"
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#"d /persist/home/${username} 0700 ${username} users -" # /persist/home/<user> created, owned by that user
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#"d /persist/nixos-config 0700 ${username} users -"
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];
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programs.fuse.userAllowOther = true;
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#https://blog.decent.id/post/nixos-systemd-initrd/
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boot.initrd.systemd.services.btrfs-rollback-impermanence = lib.mkIf (rootIsBtrfs && config.boot.initrd.systemd.enable) {
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description = "Rollback BTRFS root dataset to blank snapshot";
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wantedBy = ["initrd.target"];
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requires = ["initrd-root-device.target"];
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after = [
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"initrd-root-device.target"
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# LUKS/TPM process
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"systemd-cryptsetup@root_vg.service"
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"local-fs-pre.target"
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];
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before = [
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"sysroot.mount"
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"create-needed-for-boot-dirs.service"
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];
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unitConfig.DefaultDependencies = "no";
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serviceConfig.Type = "oneshot";
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script = ''
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mkdir -p /btrfs_tmp
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mount /dev/mapper/root_vg /btrfs_tmp
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if [[ -e /btrfs_tmp/root ]]; then
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mkdir -p /btrfs_tmp/old_roots
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timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/root)" "+%Y-%m-%-d_%H:%M:%S")
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mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$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 "$1" | cut -f 9- -d ' '); do
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delete_subvolume_recursively "/btrfs_tmp/$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 $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +7); do
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delete_subvolume_recursively "$i"
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done
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btrfs subvolume create /btrfs_tmp/root
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umount /btrfs_tmp
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'';
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};
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};
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}
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