mirror of
https://github.com/ryan4yin/nix-config.git
synced 2026-11-13 12:13:36 +01:00
Ryan Yin
35ae8732c3
EasyEffects 8 keeps its KConfig settings database plus user presets, autoload profiles and imported models under $HOME, which the tmpfs root drops on reboot; bind-mount both directories from /persistent. Assisted-by: DeepSeek Harness 0.2.1-rc.2 (deepseek-flash)
499 lines
15 KiB
Nix
499 lines
15 KiB
Nix
{
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preservation,
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lib,
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pkgs,
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myvars,
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...
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}:
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let
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inherit (myvars) username;
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in
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{
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imports = [
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preservation.nixosModules.default
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];
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preservation.enable = true;
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# pverservation required initrd using systemd.
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boot.initrd.systemd.enable = true;
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environment.systemPackages = [
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# Whole-filesystem disk usage (`-x` stays on one filesystem):
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# sudo gdu -n -x / # non-interactive, plain text
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# sudo gdu -o /tmp/gdu.json / # JSON export
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pkgs.gdu
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];
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# There are two ways to clear the root filesystem on every boot:
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## 1. use tmpfs for /
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## 2. (btrfs/zfs only)take a blank snapshot of the root filesystem and revert to it on every boot via:
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## boot.initrd.postDeviceCommands = ''
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## mkdir -p /run/mymount
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## mount -o subvol=/ /dev/disk/by-uuid/UUID /run/mymount
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## btrfs subvolume delete /run/mymount
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## btrfs subvolume snapshot / /run/mymount
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## '';
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#
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# See also https://grahamc.com/blog/erase-your-darlings/
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# NOTE: preservation only mounts the directory/file list below to /persistent
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# If the directory/file already exists in the root filesystem you should
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# move those files/directories to /persistent first!
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# Removing an entry stops its mount on the next activation, but leaves the empty
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# root-owned mountpoint behind on the tmpfs root, so a Home Manager link into that
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# path fails with "Permission denied" until it is removed once (`sudo rmdir
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# <path>`); nothing recreates it afterwards.
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preservation.preserveAt."/persistent" = {
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directories = [
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"/etc/NetworkManager/system-connections"
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"/etc/ssh"
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"/etc/nix/inputs"
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"/etc/secureboot" # lanzaboote - secure boot
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# my secrets
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"/etc/agenix/"
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"/var/log"
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# system caches (e.g. restic, plocate; slow to rebuild)
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"/var/cache"
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# General scratch space. It is re-creatable and can grow large, so keep it
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# off the root tmpfs and on the persistent volume. Contents only
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# accumulate between reboots: the tmpfiles rule below wipes it at boot.
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# World-writable scratch, so harden the bind mount like /tmp; the mode
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# must stay 1777 to match that `D!` rule.
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{
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directory = "/var/tmp";
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mode = "1777";
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mountOptions = [
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"nosuid"
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"nodev"
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];
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}
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# btrbk state/home (SSH keys, cache). The owner must match the btrbk
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# module's `d /var/lib/btrbk 0750 btrbk btrbk` rule, which preservation
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# would otherwise override with the default root:root.
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{
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directory = "/var/lib/btrbk";
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user = "btrbk";
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group = "btrbk";
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mode = "0750";
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}
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# CUPS state (the print spool lives in /var/spool/cups, not here)
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"/var/lib/cups"
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# system-core
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"/var/lib/nixos"
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"/var/lib/systemd"
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# upower device battery history (e.g. Magic Trackpad)
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"/var/lib/upower"
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{
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directory = "/var/lib/private";
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mode = "0700";
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}
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# containers
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# "/var/lib/docker"
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"/var/lib/cni"
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"/var/lib/containers"
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# virtualisation
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"/var/lib/libvirt"
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"/var/lib/qemu"
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# "/var/lib/waydroid"
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# network
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"/var/lib/bluetooth"
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"/var/lib/NetworkManager"
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"/var/lib/iwd"
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"/var/lib/tailscale"
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# logrotate state. Persist the directory: a single-file bind mount cannot
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# be replaced by logrotate's atomic rename() (EBUSY).
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"/var/lib/logrotate"
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];
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files = [
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# auto-generated machine ID
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{
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file = "/etc/machine-id";
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inInitrd = true;
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}
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];
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# the following directories will be passed to /persistent/home/$USER
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users.${username} = {
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commonMountOptions = [
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"x-gvfs-hide"
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];
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directories = [
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# ======================================
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# XDG Directories
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# ======================================
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"Desktop"
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"Downloads"
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"Music"
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"Pictures"
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"Documents"
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"Videos"
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# Keep .cache off tmpfs to avoid high RAM usage; many apps use it and it is storage-heavy.
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".cache"
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# NOTE: do NOT persist ~/.local/share/Trash here. The trash crate (nushell
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# `rm --trash`) picks the home trash only when the file's mount topdir equals
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# the trash dir's topdir; a bind-mounted Trash dir would make files straight
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# under $HOME fail with EACCES (it would try /.Trash-$uid). The home trash on
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# tmpfs is lost on reboot, which is acceptable: scattered per-mount
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# .Trash-$uid dirs on persistent volumes are covered by the trash-empty
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# retention timer (modules/nixos/base/trash.nix).
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# ======================================
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# Codes / Work / Playground
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# ======================================
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"codes" # for personal code
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"work" # work code tree
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"src" # third-party source checkouts
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"nix-config"
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"tmp"
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# ======================================
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# Nix / Home Manager Profiles
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# ======================================
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".local/state/home-manager"
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".local/state/nix/profiles"
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".local/state/noctalia" # shell settings, notification/clipboard history
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".local/share/nix"
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# ======================================
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# IDE / Editors
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# ======================================
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# vscode
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".vscode"
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".config/Code"
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# zed
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".config/zed"
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".local/share/zed"
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# ai agents
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".agents" # skills for all agents
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".config/agents"
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".codex"
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".dsh" # DeepSeek Harness
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".pi"
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".config/opencode"
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".local/share/opencode"
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".local/state/opencode"
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# ctx7 docs lookup login
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{
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directory = ".config/context7";
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mode = "0700";
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}
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# nvim
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".local/share/nvim"
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".local/state/nvim"
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# ======================================
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# TUIOS (terminal window manager)
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# ======================================
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# Without .local/state/tuios the daemon has no saved session state to
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# restore after a reboot, and every session is lost.
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# session structure (resurrection), plus each pane's saved history
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{
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directory = ".local/state/tuios";
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mode = "0700";
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}
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# project-tape trust store and tape recordings
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{
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directory = ".local/share/tuios";
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mode = "0700";
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}
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# layout templates (config.toml is a Home Manager symlink into the repo)
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".config/tuios"
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# Joplin
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".config/joplin" # tui client
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".config/Joplin" # joplin-desktop
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".local/share/jupyter"
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".ipython"
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# ======================================
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# Cloud Native
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# ======================================
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{
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directory = ".aws";
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mode = "0700";
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}
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{
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directory = ".aliyun";
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mode = "0700";
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}
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{
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directory = ".config/gcloud";
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mode = "0700";
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}
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{
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directory = ".config/gh";
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mode = "0700";
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}
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{
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directory = ".kube";
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mode = "0700";
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}
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".terraform.d/plugin-cache" # terraform's plugin cache
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# ======================================
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# language package managers
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# ======================================
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".npm" # typsescript/javascript
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"go"
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".cargo" # rust
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".m2" # java maven
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".gradle" # java gradle
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".local/bin"
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# python uv
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".local/share/uv"
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# ======================================
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# Security
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# ======================================
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{
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directory = ".gnupg";
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mode = "0700";
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}
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# hand-edited secret config, plus the env file derived from it; Nix deploys neither
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{
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directory = ".secrets";
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mode = "0700";
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}
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{
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directory = ".ssh";
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mode = "0700";
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}
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{
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directory = ".pki";
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mode = "0700";
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}
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{
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directory = ".local/share/password-store";
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mode = "0700";
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}
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{
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# gnmome keyrings
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directory = ".local/share/keyrings";
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mode = "0700";
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}
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# ======================================
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# Games / Media
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# ======================================
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"Games"
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# .desktop entries created by games/installers (including the umu
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# launchers the nix-config-umu-game skill generates). Home Manager
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# rewrites its mimeapps.list symlink into the bind mount at activation,
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# so that survives too.
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".local/share/applications"
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".steam"
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".config/MangoHud"
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".config/blender"
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".local/share/umu"
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".local/share/Steam"
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# WiVRn atomically replaces its settings and pairing files, so preserve
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# the directory rather than individual files.
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{
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directory = ".config/wivrn";
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mode = "0700";
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}
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{
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directory = ".android"; # ADB host keys for Quest USB authorization
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mode = "0700";
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}
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".local/state/Heroic"
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".config/heroic"
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".local/share/GOG.com"
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".local/share/StardewValley"
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".local/share/feral-interactive"
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# ======================================
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# Meeting / Remote Desktop / Recording
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# ======================================
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".zoom"
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".config/obs-studio"
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".config/Moonlight Game Streaming Project"
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".config/sunshine"
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".config/freerdp"
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".config/remmina"
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".local/share/remmina"
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# ======================================
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# browsers
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# ======================================
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".mozilla"
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".config/google-chrome"
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".config/chromium"
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".config/BraveSoftware/Brave-Origin"
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".config/microsoft-edge"
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# ======================================
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# CLI data
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# ======================================
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".local/share/atuin"
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".local/share/zoxide"
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".local/share/direnv"
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".local/share/k9s"
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# ======================================
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# Containers
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# ======================================
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".local/share/containers"
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# nixpak app's data
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{
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directory = ".var";
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mode = "0700";
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}
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# ======================================
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# Misc
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# ======================================
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# Mihomo (native core): sources spec, generator and config all live here
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# (contains subscription secrets, hence 0700).
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{
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directory = ".config/mihomo";
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mode = "0700";
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}
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# Orca Slicer - 3D Printer Slicer
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".local/share/orca-slicer"
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".config/OrcaSlicer"
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# Bambu Studio - 3D Printer Slicer
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".local/share/bambu-studio"
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".config/BambuStudio"
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# Audio
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".config/pulse"
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".local/state/wireplumber"
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# EasyEffects 8: KConfig settings database plus user presets, autoload
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# profiles and imported impulse responses/RNNoise models. The preset
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# declared in home/linux/gui/base/media.nix is re-linked here by Home
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# Manager activation; everything the GUI writes needs the persistent
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# mount or it is gone after a reboot.
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".config/easyeffects"
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".local/share/easyeffects"
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# go-musicfox - TUI NetEase Cloud Music client
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# ~/.config/go-musicfox/config.toml is force-managed by Home Manager
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# (see home/linux/gui/base/go-musicfox/default.nix) and reset on each
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# rebuild; this keeps the runtime themes/ directory and the app's
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# between-rebuild config edits.
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".config/go-musicfox"
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".local/share/go-musicfox" # login cookie + library db
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".local/state/go-musicfox" # logs
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# Digital Painting
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".local/share/krita"
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# Japanese IME
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".config/mozc" # used by fcitx5-mozc
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# Vinput voice input (fcitx5-vinput): the downloaded sherpa-onnx models
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# (~/.local/share/vinput/models/). Without them the daemon starts with
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# "Local ASR provider model is not configured" after every reboot. Its
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# config needs no entry: it is an out-of-store link into the preserved
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# nix-config checkout. Setup: home/linux/gui/base/vinput/README.md
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".local/share/vinput"
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".config/nushell"
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];
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files = [
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{
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file = ".config/zoomus.conf";
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how = "symlink";
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}
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{
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file = ".config/zoom.conf";
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how = "symlink";
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}
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];
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};
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};
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# Keep logrotate's state inside the directory preserved above instead of the
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# default /var/lib/logrotate.status (a mount point `rename()` cannot replace).
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services.logrotate.extraArgs = [
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"--state"
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"/var/lib/logrotate/status"
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];
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# Create some directories with custom permissions.
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#
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# In this configuration the path `/home/butz/.local` is not an immediate parent
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# of any persisted file so it would be created with the systemd-tmpfiles default
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# ownership `root:root` and mode `0755`. This would mean that the user `butz`
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# could not create other files or directories inside `/home/butz/.local`.
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#
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# Therefore systemd-tmpfiles is used to prepare such directories with
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# appropriate permissions.
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#
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# Note that immediate parent directories of persisted files can also be
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# configured with ownership and permissions from the `parent` settings if
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# `configureParent = true` is set for the file.
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systemd.tmpfiles.settings.preservation =
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let
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permission = {
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user = username;
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group = lib.mkForce username;
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mode = lib.mkForce "0750";
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};
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in
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{
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"/home/${username}/.config".d = permission;
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"/home/${username}/.local".d = permission;
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"/home/${username}/.local/share".d = permission;
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"/home/${username}/.local/state".d = permission;
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"/home/${username}/.local/state/nix".d = permission;
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"/home/${username}/.terraform.d".d = permission;
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};
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# /var/tmp is re-creatable scratch, but it must not consume RAM, so it is
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# bind-mounted onto the persistent volume above. Wipe it at boot (mirrors
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# nixpkgs `boot.tmp.cleanOnBoot` for /tmp) so contents only accumulate
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# between reboots.
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#
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# Crash dumps live in the persisted /var/lib/systemd and can contain secrets
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# copied out of process memory, so don't keep them across reboots either.
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systemd.tmpfiles.rules = [
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"D! /var/tmp 1777 root root"
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"D! /var/lib/systemd/coredump 0755 root root"
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];
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# Mask the commit service: /etc/machine-id is persisted by preservation
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# (see the `files` entry above), so there is no transient ID to commit.
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systemd.suppressedSystemUnits = [ "systemd-machine-id-commit.service" ];
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# Inert while the unit is masked above; kept as the alternative approach.
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systemd.services.systemd-machine-id-commit = {
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unitConfig.ConditionPathIsMountPoint = [
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""
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"/persistent/etc/machine-id"
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];
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serviceConfig.ExecStart = [
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""
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"systemd-machine-id-setup --commit --root /persistent"
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];
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};
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}
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