Christoph Urlacher
5c4ebd549e
- Run after "systemd-cryptsetup@crypted.service" instead of "dev-mapper-crypted.device" - Delete old backups after recreating home and root subvols in case of failure - Remove possible immutable attributes from backups, so the service doesn't fail because it's not able to clear old backups
307 lines
11 KiB
Nix
307 lines
11 KiB
Nix
{
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config,
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lib,
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mylib,
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username,
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pkgs,
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...
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}: let
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inherit (config.modules) impermanence;
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in {
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options.modules.impermanence = import ./options.nix {inherit lib mylib;};
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config = let
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# NOTE: Setting user/group/mode only has an effect if the
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# directory is created by impermanence!
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m777 = "u=rwx,g=rwx,o=rwx";
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m755 = "u=rwx,g=rx,o=rx";
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m711 = "u=rwx,g=x,o=x";
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m700 = "u=rwx,g=,o=";
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m644 = "u=rw,g=r,o=r";
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m600 = "u=rw,g=,o=";
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m444 = "u=r,g=r,o=r";
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mkDir = user: directory: mode: {
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inherit directory mode;
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user = config.users.users.${user}.name;
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group = config.users.users.${user}.group;
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};
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mkFile = user: file: mode: {
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inherit file;
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# This doesn't make much sense to set generally, e.g. when
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# linking multiple files to ~/.config (they all have the same parent directory)
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# parentDirectory = {
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# inherit mode;
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# user = config.users.users.${user}.name;
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# group = config.users.users.${user}.group;
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# };
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};
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in
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lib.mkIf impermanence.enable {
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environment.persistence."/persist" = let
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mkRDir = mkDir "root";
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mkRFile = mkFile "root";
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mkUDir = mkDir "${username}";
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mkUFile = mkFile "${username}";
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in {
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hideMounts = true; # Sets x-gvfs-hide option
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files = [
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(mkRFile "/etc/adjtime" m644)
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(mkRFile "/etc/machine-id" m444)
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];
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directories = [
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(mkRDir "/etc/NetworkManager" m755)
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(mkRDir "/etc/secureboot" m755)
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(mkRDir "/etc/ssh" m755)
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# https://github.com/nix-community/impermanence/issues/253
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(mkRDir "/usr/systemd-placeholder" m755)
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(mkRDir "/var/db/sudo" m711)
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(mkRDir "/var/lib/bluetooth" m755) # m700
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(mkRDir "/var/lib/containers" m755)
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(mkRDir "/var/lib/flatpak" m755)
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(mkRDir "/var/lib/libvirt" m755)
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(mkRDir "/var/lib/NetworkManager" m755)
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(mkRDir "/var/lib/nixos" m755)
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(mkRDir "/var/lib/private/ollama" m755)
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(mkRDir "/var/lib/systemd" m755)
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(mkRDir "/var/tmp" m777)
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];
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users.${username} = {
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files = [
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# NOTE: Don't put files generated/linked by HM here (they're already managed)
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# TODO: Why do these not work?
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(mkUFile ".config/.tidal-dl.json" m755)
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(mkUFile ".config/.tidal-dl.token.json" m755)
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(mkUFile ".config/QtProject.conf" m755) # KeePassXC
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];
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directories = [
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(mkUDir "Downloads" m755)
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(mkUDir "Documents" m755)
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(mkUDir "GitRepos" m755)
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(mkUDir "NixFlake" m755)
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(mkUDir "Notes" m755)
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(mkUDir "Pictures" m755)
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(mkUDir "Projects" m755)
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(mkUDir "Public" m755)
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(mkUDir "Unity" m755)
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(mkUDir "Videos" m755)
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(mkUDir ".gnupg" m755) # m600
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(mkUDir ".secrets" m755) # m644
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(mkUDir ".ssh" m755) # m644
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(mkUDir ".android" m755) # Unity
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(mkUDir ".java" m755) # Unity/Rider
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(mkUDir ".mozilla/firefox" m755) # TODO: Remove this someday
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(mkUDir ".mozilla/native-messaging-hosts" m755)
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(mkUDir ".nix-package-search" m755)
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(mkUDir ".ollama" m755)
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(mkUDir ".var/app" m755)
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(mkUDir ".vim/undo" m755)
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(mkUDir ".zotero" m755)
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(mkUDir ".cache/fish/generated_completions" m755)
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(mkUDir ".cache/nix-index" m755)
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(mkUDir ".cache/nix-search-tv" m755)
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(mkUDir ".cache/nvim" m755)
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(mkUDir ".config/beets" m755)
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(mkUDir ".config/chromium" m755) # TODO: Remove this someday
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(mkUDir ".config/Ferdium" m755)
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(mkUDir ".config/fish/completions" m755)
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(mkUDir ".config/impermanence" m755)
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(mkUDir ".config/JetBrains" m755) # Unity/Rider
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(mkUDir ".config/kdeconnect" m755)
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(mkUDir ".config/keepassxc" m755)
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(mkUDir ".config/Msty" m755)
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(mkUDir ".config/Nextcloud" m755)
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(mkUDir ".config/obsidian" m755)
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(mkUDir ".config/tidal-hifi" m755)
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(mkUDir ".config/tidal_dl_ng" m755)
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(mkUDir ".config/unity3d" m755) # Unity
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(mkUDir ".config/vlc" m755)
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(mkUDir ".config/Zeal" m755)
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(mkUDir ".local/share/direnv" m755)
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(mkUDir ".local/share/docker" m755)
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(mkUDir ".local/share/fish" m755)
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(mkUDir ".local/share/flatpak" m755)
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(mkUDir ".local/share/JetBrains" m755) # Unity/Rider
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(mkUDir ".local/share/hyprland" m755)
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(mkUDir ".local/share/keyrings" m755) # m700
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(mkUDir ".local/share/mime" m755)
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(mkUDir ".local/share/nix" m755)
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(mkUDir ".local/share/nvim" m755)
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(mkUDir ".local/share/systemd" m755)
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(mkUDir ".local/share/zoxide" m755)
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(mkUDir ".local/state/astal/notifd" m755)
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(mkUDir ".local/state/lazygit" m755)
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(mkUDir ".local/state/nix" m755)
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(mkUDir ".local/state/nvim" m755)
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(mkUDir ".local/state/wireplumber" m755)
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];
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};
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};
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# NOTE: This is REQUIRED for HM activation! Otherwise the home directory won't be writable!
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systemd.services."impermanence-fix-home-ownership" = let
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homeDir = "/home/${username}";
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homeUser = builtins.toString config.users.users.${username}.uid;
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homeGroup = builtins.toString config.users.groups.${config.users.users.${username}.group}.gid;
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in {
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description = "Fix impermanent home ownership";
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wantedBy = ["home-manager-${username}.service"]; # Required for HM activation
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before = ["home-manager-${username}.service"];
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after = ["home.mount"];
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partOf = ["home.mount"];
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serviceConfig.Type = "oneshot";
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script = ''
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# Don't chown if NFS shares are already mounted.
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# This can happen outside of regular booting (e.g. nixos-rebuild switch),
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# so we don't return an error.
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# NOTE: Use || true as NixOS sets the damn -e, otherwise this unit fails on boot!
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nfs_mounts=$(grep ' nfs4 ' /proc/mounts || true)
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if [[ -n "$nfs_mounts" ]]; then
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echo "NFS shares are mounted into the home directory, aborting:"
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echo "$nfs_mounts"
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exit 0
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else
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echo "No NFS shares are mounted into the home directory, continuing..."
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fi
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if [[ -d ${homeDir} ]]; then
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chown -R ${homeUser}:${homeGroup} ${homeDir}
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echo "Set ownership for ${homeDir} to ${homeUser}:${homeGroup}"
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else
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echo "ERROR: Home ${homeDir} does not exist!"
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exit 1
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fi
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'';
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};
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# Because we have a LUKS encrypted drive
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# we use a systemd service to cleanup the volumes
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boot.initrd.systemd = {
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enable = true;
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services.impermanence-btrfs-cleanup = let
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backupDuration = "7"; # Days
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mountDir = "/btrfs_tmp";
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persistDir = "${mountDir}/persist";
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homeUser = builtins.toString config.users.users.${username}.uid;
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homeGroup = builtins.toString config.users.groups.${config.users.users.${username}.group}.gid;
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in {
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description = "Clean impermanent btrfs subvolumes";
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wantedBy = ["initrd.target"];
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# after = ["dev-mapper-crypted.device"];
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after = ["systemd-cryptsetup@crypted.service"];
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before = ["sysroot.mount"];
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unitConfig.DefaultDependencies = "no";
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serviceConfig.Type = "oneshot";
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# path = ["/bin" config.system.build.extraUtils pkgs.coreutils-full];
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# NOTE: If any single line of this script fails, the entire system might be bricked
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# NixOS automatically sets "-e", so if unlucky, the subvolumes won'e exist for mounting
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script = let
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mvSubvolToPersist = subvol: ''
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if [[ -e ${mountDir}/${subvol} ]]; then
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mkdir -p ${persistDir}/old_${subvol}s
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timestamp=$(date --date="@$(stat -c %Y ${mountDir}/${subvol})" "+%Y-%m-%-d_%H:%M:%S")
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mv ${mountDir}/${subvol} "${persistDir}/old_${subvol}s/$timestamp"
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# Make the backup mutable (in case it is not, e.g. /var/empty)
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# chattr -R -i -f "${persistDir}/old_${subvol}s/$timestamp"
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echo "Backed up previous ${subvol} subvolume to ${persistDir}/old_${subvol}s/$timestamp"
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fi
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'';
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mkNewSubvol = subvol: ''
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if [[ ! -e ${mountDir}/${subvol} ]]; then
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btrfs subvolume create ${mountDir}/${subvol}
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echo "Created new subvolume ${mountDir}/${subvol}"
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else
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echo "Failed to move ${mountDir}/${subvol} (${mountDir}/${subvol} still exists), not creating new subvolume..."
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fi
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'';
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deleteOldBackups = subvol: ''
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for old_${subvol} in $(find ${persistDir}/old_${subvol}s/ -maxdepth 1 -mtime +${backupDuration}); do
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delete_subvolume_recursively "$old_${subvol}"
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done
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'';
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in ''
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# This dir will be created in the initrd ramdisk
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mkdir -p ${mountDir}
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# We mount the root subvolume. Because we're using a flat btrfs layout,
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# "/" contains the subfolders (-volumes) home, log, nix, persist, root, swap, ...
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mount -o subvol=/ /dev/mapper/crypted ${mountDir}
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# Check if the persist dir exists so we can move stuff to it
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if [[ ! -e ${persistDir} ]]; then
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echo "${persistDir} doesn't exist, aborting..."
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umount ${mountDir}
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rmdir ${mountDir}
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exit 0
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fi
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# Move root subvolume to backup location
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${mvSubvolToPersist "root"}
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# Move home subvolume to backup location
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${mvSubvolToPersist "home"}
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# Create new root subvolume
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${mkNewSubvol "root"}
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# Create new home subvolume
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${mkNewSubvol "home"}
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# Delete a backed up subvolume
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# delete_subvolume_recursively() {
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# IFS=$'\n'
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# # https://github.com/nix-community/impermanence/issues/258#issuecomment-2733383737
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# # If we accidentally end up with a file or directory under old_roots,
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# # the code will enumerate all subvolumes under the main volume.
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# # We don't want to remove everything under true main volume. Only
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# # proceed if this path is a btrfs subvolume (inode=256).
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# if [ $(stat -c %i "$1") -ne 256 ]; then return; fi
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# for subvol in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
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# delete_subvolume_recursively "${persistDir}/$subvol"
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# done
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# btrfs subvolume delete "$1"
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# echo "Deleted old subvolume $1"
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# }
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# Delete old root backups
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# $ {deleteOldBackups "root"}
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# Delete old home backups
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# $ {deleteOldBackups "home"}
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umount ${mountDir}
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rmdir ${mountDir}
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'';
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};
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};
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};
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}
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