Mads Fagerlund
ddca4e1d72
Workspaces were pinned one-per-monitor, so switching only ever moved one screen. The virtual-desktops plugin replaces them with vdesks that span every monitor, and SUPER+1..5 now switches all screens together. Hyprland plugins are ABI-locked to the compositor, so the input's nixpkgs follows ours to compile against the hyprland we actually run. cycleworkspaces stays off: upstream says it breaks above 2 monitors, and pc has 3. The session had also been dying several times a day, which looked like a Hyprland crash and was not one. There was no swap at all, and a nixos-rebuild forks ~60 nix evaluators; stacked on a browser and a few editor sessions that exhausted all 15G, leaving page cache squeezed to 40M while 13G sat in anon and nothing was reclaimable. The kernel then OOM-killed 1Password (highest oom_score_adj), and because every GUI app shares the wayland-wm@hyprland.service cgroup, systemd's default OOMPolicy=stop tore down the whole unit -- compositor included, with uwsm's Restart=no meaning nothing came back. Two independent fixes: zram swap (50% of RAM, zstd) with vm.swappiness raised to 180, so the kernel compresses anon pages instead of evicting cache, which raises the ceiling; and OOMPolicy=continue, so that hitting it costs one app instead of the desktop. zram rather than a swapfile because root is compress=zstd, and a btrfs swapfile needs its own nodatacow, uncompressed subvolume. Also lands the pending work in this tree: hyprshot replaces grimblast for screenshots (it reads HYPRSHOT_DIR, not XDG_SCREENSHOTS_DIR, so shots were landing loose in ~/Pictures), hyprlock at boot so login lands on the lock screen and unlocks the keyring, the battery popup moves to SUPER+R, and SUPER+W/E open floating wifi and bluetooth panels. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
653 lines
27 KiB
Nix
653 lines
27 KiB
Nix
{
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description = "mads — NixOS for Apple Silicon (mbp) and x86 (pc), one flake";
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inputs = {
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nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
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apple-silicon = {
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url = "github:nix-community/nixos-apple-silicon";
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inputs.nixpkgs.follows = "nixpkgs";
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};
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home-manager = {
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url = "github:nix-community/home-manager";
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inputs.nixpkgs.follows = "nixpkgs";
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};
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firefox-addons = {
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url = "gitlab:rycee/nur-expressions?dir=pkgs/firefox-addons";
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inputs.nixpkgs.follows = "nixpkgs";
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};
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zen-browser = {
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url = "github:0xc000022070/zen-browser-flake";
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inputs.nixpkgs.follows = "nixpkgs";
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inputs.home-manager.follows = "home-manager";
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};
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# linear-tui has no flake of its own, so take the source and build it below.
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# Pinned to a tag; `nix flake update` moves it and records the hash in
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# flake.lock, so there is no sha256 to maintain by hand.
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linear-tui-src = {
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url = "github:k1-c/linear-tui/v0.13.0";
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flake = false;
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};
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# Virtual desktops: one desktop spans all monitors, replacing Hyprland's
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# workspace-pinned-to-monitor model. Its own nixpkgs pin is older than
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# ours, and Hyprland plugins are ABI-locked to the compositor, so it must
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# follow ours to compile against the hyprland we actually run.
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hyprland-virtual-desktops = {
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url = "github:levnikmyskin/hyprland-virtual-desktops";
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inputs.nixpkgs.follows = "nixpkgs";
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};
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};
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outputs = { self, nixpkgs, apple-silicon, home-manager, firefox-addons, zen-browser, linear-tui-src, hyprland-virtual-desktops, ... }:
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let
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# linear-tui, built from the pinned source input above. Upstream ships no
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# flake and it is not in nixpkgs, but it has a committed Cargo.lock, so
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# cargoLock.lockFile covers the dependency hashes with nothing to vendor.
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#
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# No OpenSSL/pkg-config needed: the crate selects reqwest's rustls
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# backend on purpose, and takes its trust roots from the OS store.
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linearTui = pkgs: pkgs.rustPlatform.buildRustPackage {
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pname = "linear-tui";
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version = "0.13.0";
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src = linear-tui-src;
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cargoLock.lockFile = "${linear-tui-src}/Cargo.lock";
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# One test (a_worktree_belongs_to_its_repository) shells out to `git`,
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# which the build sandbox lacks -- it panics on NotFound unwrapping
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# Command::new("git"). Supplying git lets all 512 tests run.
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nativeCheckInputs = [ pkgs.git ];
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meta.mainProgram = "linear-tui";
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};
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# ───────────────────── shared home-manager user ─────────────────────
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home = { pkgs, osConfig, ... }: {
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imports = [ zen-browser.homeModules.beta ];
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home.stateVersion = "25.11";
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programs.eww = {
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enable = true;
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package = pkgs.eww;
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};
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# Raw configs that stay files (no good native module).
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# `hypr` is recursive so we can drop a host-specific monitors.conf in
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# alongside the shared files (hyprland.conf `source`s it).
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xdg.configFile = {
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"hypr" = { source = ./config/hypr; recursive = true; };
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"hypr/monitors.conf".text =
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if osConfig.networking.hostName == "mbp"
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then ''
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monitor = , preferred, auto, 2.0
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# Floating TUI panels: 70% wide, full height. Absolute px because
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# Hyprland 0.56 ignores percentages in `size`. 1728x1080 logical.
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windowrule = match:class ^(panel-wifi|panel-bt)$, float on, size 1210 1080, center on
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''
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else ''
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monitor = desc:Lenovo Group Limited P27q-20 V909LRFR, 2560x1440@60, 0x0, 1.0
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monitor = desc:Lenovo Group Limited P27q-20 V909LPNY, 2560x1440@60, 2560x0, 1.0
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monitor = desc:Lenovo Group Limited P27q-20 V909LRDD, 2560x1440@60, 5120x0, 1.0
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# Same panels, sized for 2560x1440 logical.
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windowrule = match:class ^(panel-wifi|panel-bt)$, float on, size 1792 1440, center on
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'';
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# Plugin load line, as a store path. Sourced from hyprland.conf, the
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# same pattern as monitors.conf. Upstream installs the library as
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# libvirtual-desktops.so (not lib<pname>.so).
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"hypr/plugins.conf".text = ''
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plugin = ${hyprland-virtual-desktops.packages.${pkgs.stdenv.hostPlatform.system}.virtual-desktops}/lib/libvirtual-desktops.so
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'';
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"eww".source = ./config/eww;
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"fuzzel".source = ./config/fuzzel;
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};
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# Launcher hygiene. These .desktop entries ship with packages we do want,
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# but they are noise in fuzzel. A NoDisplay entry in XDG_DATA_HOME
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# shadows the package's own copy, which is the only way to hide one
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# without patching the package.
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#
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# Deliberately home.file and NOT xdg.desktopEntries: that option only
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# emits anything when xdg.enable = true, which we don't set, so it
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# silently produces no files at all.
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# nvim - neovim's "Neovim wrapper" entry; we only launch it from a terminal
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# uuctl - uwsm's systemd-user-unit picker, pulled in by withUWSM
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home.file = {
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".local/share/applications/nvim.desktop".text = ''
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[Desktop Entry]
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Type=Application
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Name=Neovim wrapper
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NoDisplay=true
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'';
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".local/share/applications/uuctl.desktop".text = ''
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[Desktop Entry]
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Type=Application
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Name=uuctl
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NoDisplay=true
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'';
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};
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# Notification daemon. Nothing owned org.freedesktop.Notifications before
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# this, so notify-send failed outright: hyprshot's "Screenshot saved"
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# toasts went nowhere, and kitty logged a DBus ServiceUnknown error on
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# every launch. Colours match the cyberdream kitty theme above.
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services.mako = {
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enable = true;
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settings = {
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font = "JetBrainsMono Nerd Font 11";
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background-color = "#16181a";
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text-color = "#ffffff";
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border-color = "#5ea1ff";
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border-size = 2;
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border-radius = 8;
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default-timeout = 5000;
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anchor = "top-right";
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margin = "12";
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padding = "12";
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width = 380;
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};
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};
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programs.kitty = {
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enable = true;
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settings = {
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font_size = "11.5";
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# cyberdream theme
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background = "#16181a";
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foreground = "#ffffff";
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cursor = "#ffffff";
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cursor_text_color = "#16181a";
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selection_background = "#3c4048";
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selection_foreground = "#ffffff";
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color0 = "#16181a";
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color8 = "#3c4048";
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color1 = "#ff6e5e";
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color9 = "#ff6e5e";
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color2 = "#5eff6c";
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color10 = "#5eff6c";
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color3 = "#f1ff5e";
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color11 = "#f1ff5e";
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color4 = "#5ea1ff";
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color12 = "#5ea1ff";
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color5 = "#bd5eff";
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color13 = "#bd5eff";
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color6 = "#5ef1ff";
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color14 = "#5ef1ff";
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color7 = "#ffffff";
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color15 = "#ffffff";
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active_tab_foreground = "#000000";
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active_tab_background = "#ffbd5e";
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inactive_tab_foreground = "#ffffff";
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inactive_tab_background = "#16181a";
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};
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};
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home.pointerCursor = {
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enable = true;
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package = pkgs.bibata-cursors;
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name = "Bibata-Modern-Ice";
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size = 24;
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gtk.enable = true;
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x11.enable = true;
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hyprcursor.enable = true;
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};
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# Dark GTK apps (file dialogs, etc).
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gtk = {
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enable = true;
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theme = { name = "Adwaita-dark"; package = pkgs.gnome-themes-extra; };
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gtk3.extraConfig.gtk-application-prefer-dark-theme = 1;
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gtk4.extraConfig.gtk-application-prefer-dark-theme = 1;
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# Adopt the new default: don't force a theme on GTK4/libadwaita apps
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# (dark still applies via prefer-dark-theme above). Silences the
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# stateVersion < 26.05 legacy-default warning.
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gtk4.theme = null;
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};
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# Neovim: init.lua verbatim; plugins + LSP pinned by Nix.
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programs.neovim = {
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enable = true;
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withPython3 = false;
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withRuby = false;
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withNodeJs = false;
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initLua = "vim.g.nix_managed = true\n"
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+ builtins.readFile ./config/nvim/init.lua;
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plugins = with pkgs.vimPlugins; [
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nvim-web-devicons cyberdream-nvim oil-nvim nvim-lspconfig
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typst-preview-nvim blink-cmp Navigator-nvim
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snacks-nvim todo-comments-nvim trouble-nvim
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nvim-treesitter.withAllGrammars
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fidget-nvim lualine-nvim
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];
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extraPackages = with pkgs; [
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lua-language-server rust-analyzer tinymist nixd zls
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yaml-language-server vscode-langservers-extracted
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typescript-language-server svelte-language-server
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];
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};
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# Zen browser + Tridactyl, extensions pinned (works on aarch64 + x86).
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programs.zen-browser = {
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enable = true;
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setAsDefaultBrowser = true;
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profiles.default = {
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settings = {
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"browser.newtabpage.enabled" = false;
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"privacy.donottrackheader.enabled" = true;
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"signon.rememberSignons" = false;
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# Dark mode
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"browser.theme.toolbar-theme" = 0;
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"browser.theme.content-theme" = 0;
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"layout.css.prefers-color-scheme.content-override" = 0;
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"ui.systemUsesDarkTheme" = 1;
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};
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# Re-instantiate pkgs with the firefox-addons overlay + allowUnfree so
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# the (unfree) 1Password addon evaluates under *our* config.
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extensions.packages = let
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addonsPkgs = import pkgs.path {
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inherit (pkgs.stdenv.hostPlatform) system;
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config.allowUnfree = true;
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overlays = [ firefox-addons.overlays.default ];
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};
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in with addonsPkgs.firefox-addons; [
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tridactyl
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ublock-origin
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onepassword-password-manager
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];
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};
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};
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# zsh + starship, no framework.
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programs.zsh = {
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enable = true;
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autosuggestion.enable = true;
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syntaxHighlighting.enable = true;
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shellAliases = { ll = "ls -alh"; gs = "git status"; };
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};
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programs.starship.enable = true;
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# SSH auth via the 1Password agent — private keys stay in the vault,
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# never on disk or in the Nix store.
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programs.ssh = {
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enable = true;
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enableDefaultConfig = false;
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settings."*".IdentityAgent = "~/.1password/agent.sock";
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};
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# git identity + SSH commit signing through 1Password's op-ssh-sign.
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programs.git = {
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enable = true;
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settings = {
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user.name = "Mads Fagerlund";
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user.email = "mads@deepvis.ai";
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user.signingkey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAPlpVGZLhfrJqh2j5q3reyGOPQQ9BgW8syQ28tYjlg2";
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gpg.format = "ssh";
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# NixOS store path — NOT 1Password's suggested /opt/1Password/... which doesn't exist here.
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"gpg \"ssh\"".program =
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"${pkgs._1password-gui}/share/1password/op-ssh-sign";
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commit.gpgsign = true;
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# Transparently use SSH (1Password agent) for the deepvis server,
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# so existing HTTPS remotes need no manual `git remote set-url`.
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url."git@git.deepvis.ai:".insteadOf = "https://git.deepvis.ai/";
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};
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};
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home.packages = with pkgs; [ ripgrep fd tridactyl-native lazygit rustc cargo clippy rustfmt rust-analyzer claude-code gcc bluetui impala postgresql fastfetch (linearTui pkgs) ];
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};
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# ───────────────────── shared system (both hosts) ─────────────────────
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common = { pkgs, ... }: {
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nix.settings.experimental-features = [ "nix-command" "flakes" ];
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# Trusted so client-side nix config takes effect — substituters and
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# remote builders are trusted settings, silently ignored for anyone
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# else. A cache that appears to do nothing is the usual symptom.
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nix.settings.trusted-users = [ "mads" ];
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# The deepvis binary cache: the embedded flakes in models/ort-nix
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# (onnxruntime built from source, a CUDA training env) are hours of
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# work to build and seconds to substitute.
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nix.settings.extra-substituters = [ "https://deepvis.cachix.org" ];
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nix.settings.extra-trusted-public-keys = [
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"deepvis.cachix.org-1:UE/H6ERLwqhSqubzh8+pzl9eTm0kpMExGe0ym6fENp8="
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];
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# Private cache, so reads need a token. nix refuses `netrc-file` on
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# the command line under the daemon, and a token in the substituter
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# URL would land in the process table — a root-owned 0600 netrc is
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# the only form the calling process cannot read.
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nix.settings.netrc-file = "/etc/nix/netrc";
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# x86_64 derivations build off this machine rather than under local
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# qemu emulation, and aarch64 ones go out too when the local
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# machine is busy.
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#
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# The host keys are pinned system-wide because the ssh'ing party is
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# the root daemon, which has no known_hosts and never gets a tty to
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# answer a trust prompt.
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programs.ssh.knownHosts."builder" = {
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extraHostNames = [ "5.9.71.104" "builder.tailf5eaab.ts.net" ];
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publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHnKIrxYtlovvYGgkpEZXY8wG/CuSLMGOM/84eIlyeVW";
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};
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programs.ssh.knownHosts."eu.nixbuild.net" = {
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publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPIQCZc54poJ8vqawd8TraNryQeJnvH1eLpIDgbiqymM";
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};
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nix.distributedBuilds = true;
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nix.buildMachines = [
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{
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hostName = "builder";
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sshUser = "builder";
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# The daemon (root) does the ssh'ing, so it needs an explicit
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# on-disk key — it has no access to a user's agent.
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sshKey = "/home/mads/.ssh/id_ed25519";
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protocol = "ssh-ng";
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system = "x86_64-linux";
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maxJobs = 16;
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supportedFeatures = [ "big-parallel" "kvm" "nixos-test" ];
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}
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# nixbuild.net, for both architectures. Listed after `builder` so
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# the machine we already pay for is preferred.
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#
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# Every feature it supports is advertised, not just the two in the
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# quickstart: nix only sends a derivation to a builder claiming
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# *every* feature that derivation requires, so omitting `kvm` or
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# `nixos-test` would silently route those back to local builds.
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{
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hostName = "eu.nixbuild.net";
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sshUser = "root";
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sshKey = "/home/mads/.ssh/id_ed25519";
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protocol = "ssh-ng";
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system = "x86_64-linux";
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maxJobs = 100;
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supportedFeatures = [ "benchmark" "big-parallel" "ca-derivations" "kvm" "nixos-test" ];
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}
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{
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hostName = "eu.nixbuild.net";
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sshUser = "root";
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sshKey = "/home/mads/.ssh/id_ed25519";
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protocol = "ssh-ng";
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system = "aarch64-linux";
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maxJobs = 100;
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supportedFeatures = [ "benchmark" "big-parallel" "ca-derivations" "kvm" "nixos-test" ];
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}
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];
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networking.networkmanager.enable = true;
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networking.networkmanager.wifi.backend = "iwd";
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# Secret Service (org.freedesktop.secrets) provider, D-Bus-activated on
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# demand. Without it 1Password can't persist the 2FA device token
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# ("unable to save your two-factor token") and re-prompts every unlock.
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services.gnome.gnome-keyring.enable = true;
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programs._1password.enable = true;
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programs._1password-gui = {
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enable = true;
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polkitPolicyOwners = [ "mads" ];
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};
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# Zen (a Firefox fork) runs as "zen-beta"; 1Password only trusts an
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# allowlist of browser process names, so add it or the extension can't
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# unlock via the desktop app. Manifest already lives in ~/.mozilla.
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environment.etc."1password/custom_allowed_browsers".text = ''
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zen-beta
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'';
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services.tailscale.enable = true;
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# Tailscale SSH: keyless, portless SSH gated by tailnet ACLs.
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# Needs a matching "ssh" rule in the admin console to actually permit access.
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services.tailscale.extraUpFlags = [ "--ssh" ];
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time.timeZone = "Europe/Copenhagen"; # set yours
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i18n.defaultLocale = "en_US.UTF-8";
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programs.hyprland = { enable = true; withUWSM = true; };
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programs.hyprlock.enable = true;
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# Every GUI app lives in the one wayland-wm@hyprland.service cgroup, so
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# with systemd's default OOMPolicy=stop a kernel OOM-kill of ANY process
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# in it stops the whole unit -- compositor included. 1Password was always
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# the victim (highest oom_score_adj), but losing it killed the entire
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# desktop, and uwsm sets Restart=no, so nothing came back. It read as
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# "Hyprland crashed" when the compositor was never at fault.
|
|
#
|
|
# continue: log the kill, lose that one app, keep the session. Merges
|
|
# into the drop-in the uwsm module already generates for this unit.
|
|
systemd.user.services."wayland-wm@".serviceConfig.OOMPolicy = "continue";
|
|
|
|
# Autologin means no password reaches PAM at login, so the gnome-keyring
|
|
# login keyring is never created or unlocked -- which is why 1Password
|
|
# could not persist its 2FA device token and re-prompted the YubiKey
|
|
# every unlock. Putting pam_gnome_keyring in hyprlock's stack instead
|
|
# makes the lock screen we already have do that job, so there is still
|
|
# exactly one password prompt and no second login screen.
|
|
security.pam.services.hyprlock.enableGnomeKeyring = true;
|
|
services.hypridle.enable = true;
|
|
|
|
# ── Amphetamine-style "stay awake" ──
|
|
# caffeine.service holds ONE logind block-inhibitor covering all three
|
|
# ways this machine can go dark:
|
|
# idle -> hypridle stops counting (no blank, no hyprlock)
|
|
# sleep -> suspend requests are refused
|
|
# handle-lid-switch -> closing the lid does nothing
|
|
# systemd owns the process, so "is it on?" is just "is the unit
|
|
# active?" -- no pidfile, and it can't be orphaned. Deliberately no
|
|
# wantedBy: it only ever starts via SUPER+A or the `caffeine` command.
|
|
systemd.user.services.caffeine = {
|
|
description = "Caffeine - inhibit idle, sleep and lid-switch";
|
|
serviceConfig = {
|
|
Type = "simple";
|
|
ExecStart = "${pkgs.systemd}/bin/systemd-inhibit --what=idle:sleep:handle-lid-switch --who=caffeine --why=stay-awake --mode=block ${pkgs.coreutils}/bin/sleep infinity";
|
|
};
|
|
};
|
|
|
|
xdg.portal = {
|
|
enable = true;
|
|
extraPortals = [ pkgs.xdg-desktop-portal-hyprland ];
|
|
};
|
|
|
|
|
|
# greetd autologins mads straight into Hyprland (via uwsm).
|
|
services.greetd = {
|
|
enable = true;
|
|
settings = {
|
|
initial_session = { user = "mads"; command = "uwsm start hyprland"; };
|
|
default_session = { user = "mads"; command = "uwsm start hyprland"; };
|
|
};
|
|
};
|
|
|
|
virtualisation.docker.enable = true;
|
|
|
|
hardware.bluetooth.enable = true;
|
|
programs.zsh.enable = true;
|
|
# No NixOS manual: it puts a "NixOS Manual" entry in the launcher and we
|
|
# read the docs on the web. man pages are unaffected.
|
|
documentation.nixos.enable = false;
|
|
|
|
fonts.packages = [ pkgs.nerd-fonts.jetbrains-mono ];
|
|
|
|
environment.systemPackages = with pkgs; [
|
|
git kitty fuzzel
|
|
wl-clipboard grim slurp swaybg brightnessctl playerctl hyprshot
|
|
hyprpolkitagent xdg-utils
|
|
|
|
# Front-end for caffeine.service (above). Bound to SUPER+A.
|
|
(writeShellApplication {
|
|
name = "caffeine";
|
|
runtimeInputs = [ systemd ];
|
|
text = ''
|
|
unit=caffeine.service
|
|
|
|
is_on() { systemctl --user is-active --quiet "$unit"; }
|
|
|
|
# Guarded so `caffeine` still works over SSH / with no compositor.
|
|
toast() {
|
|
command -v hyprctl >/dev/null 2>&1 || return 0
|
|
hyprctl notify "$1" 2000 "$2" "$3" >/dev/null 2>&1 || true
|
|
}
|
|
|
|
wake_on() {
|
|
systemctl --user start "$unit"
|
|
toast 5 "rgb(5eff6c)" "Caffeine ON - idle, sleep and lid disabled"
|
|
}
|
|
|
|
wake_off() {
|
|
systemctl --user stop "$unit"
|
|
toast 1 "rgb(ff6e5e)" "Caffeine OFF - normal sleep restored"
|
|
}
|
|
|
|
case "''${1:-toggle}" in
|
|
toggle) if is_on; then wake_off; else wake_on; fi ;;
|
|
on) wake_on ;;
|
|
off) wake_off ;;
|
|
status) if is_on; then echo on; else echo off; fi ;;
|
|
*) echo "usage: caffeine [toggle|on|off|status]" >&2; exit 2 ;;
|
|
esac
|
|
'';
|
|
})
|
|
];
|
|
|
|
users.users.mads = {
|
|
isNormalUser = true;
|
|
extraGroups = [ "wheel" "networkmanager" "video" "docker" ];
|
|
shell = pkgs.zsh;
|
|
initialPassword = "changeme"; # CHANGE after first boot (`passwd`)
|
|
};
|
|
|
|
system.stateVersion = "25.11";
|
|
|
|
home-manager.useGlobalPkgs = true;
|
|
home-manager.useUserPackages = true;
|
|
# Back up (don't clobber) any pre-existing files HM wants to manage.
|
|
home-manager.backupFileExtension = "hm-bak";
|
|
home-manager.users.mads = home;
|
|
};
|
|
|
|
mkHost = { system, modules }: nixpkgs.lib.nixosSystem {
|
|
inherit system;
|
|
modules = [
|
|
home-manager.nixosModules.home-manager
|
|
common
|
|
({ pkgs, ... }: {
|
|
nixpkgs.config.allowUnfree = true;
|
|
})
|
|
] ++ modules;
|
|
};
|
|
|
|
in
|
|
{
|
|
nixosConfigurations = {
|
|
# ── Apple Silicon MacBook (Asahi) ──
|
|
mbp = mkHost {
|
|
system = "aarch64-linux";
|
|
modules = [
|
|
apple-silicon.nixosModules.apple-silicon-support
|
|
./hosts/mbp/hardware-configuration.nix # generated on the Mac
|
|
({ ... }: {
|
|
networking.hostName = "mbp";
|
|
|
|
# Wi-Fi/BT firmware, vendored (a pure flake can't read /boot/asahi).
|
|
hardware.asahi.peripheralFirmwareDirectory = ./firmware;
|
|
hardware.asahi.enable = true;
|
|
|
|
boot.loader.systemd-boot.enable = true;
|
|
boot.loader.systemd-boot.configurationLimit = 3; # 500M ESP is small
|
|
boot.extraModprobeConfig = "options hid_apple fnmode=1";
|
|
boot.blacklistedKernelModules = [ "pcspkr" ];
|
|
|
|
# Root is btrfs (p8). A scrub re-reads every block and verifies its
|
|
# checksum, which is the only way bit rot on this SSD surfaces before
|
|
# something tries to read the damaged file. Metadata is DUP, so a bad
|
|
# metadata block gets repaired from its copy automatically.
|
|
services.btrfs.autoScrub = {
|
|
enable = true;
|
|
interval = "monthly";
|
|
fileSystems = [ "/" ];
|
|
};
|
|
|
|
# 15G of RAM and no swap at all: a `nixos-rebuild` forks ~60 nix
|
|
# evaluators, and stacked on a browser and a few editor sessions
|
|
# that was enough to exhaust it. The kernel then OOM-killed a
|
|
# process inside wayland-wm@hyprland.service, and systemd's default
|
|
# OOMPolicy=stop tore the whole graphical session down with it.
|
|
#
|
|
# zram rather than a swapfile, because root is compress=zstd and a
|
|
# btrfs swapfile needs its own nodatacow, uncompressed subvolume.
|
|
zramSwap = {
|
|
enable = true;
|
|
memoryPercent = 50; # 7.6G of backing store, ~a third of that in real RAM
|
|
};
|
|
|
|
# Swapping to RAM is cheap, so let the kernel compress anon pages
|
|
# rather than evict page cache. At the OOM above, cache had already
|
|
# been squeezed to 40M while 13G sat in anon and nothing was
|
|
# reclaimable — the default swappiness of 60 gets that backwards here.
|
|
boot.kernel.sysctl = {
|
|
"vm.swappiness" = 180;
|
|
"vm.page-cluster" = 0; # zram has no seek penalty, so no readahead
|
|
};
|
|
|
|
# Build x86_64 derivations (packing-station iso/deploys) via qemu.
|
|
boot.binfmt.emulatedSystems = [ "x86_64-linux" ];
|
|
|
|
# Resolve .local names, so the packing stations can be reached and
|
|
# deployed to by hostname instead of by address.
|
|
services.avahi = {
|
|
enable = true;
|
|
nssmdns4 = true;
|
|
};
|
|
|
|
# Asahi kernel + Mesa cache, and the Raspberry Pi vendor
|
|
# kernel/firmware cache (else both compile from source).
|
|
nix.settings = {
|
|
extra-substituters = [
|
|
"https://nixos-apple-silicon.cachix.org"
|
|
"https://nixos-raspberrypi.cachix.org"
|
|
];
|
|
extra-trusted-public-keys = [
|
|
"nixos-apple-silicon.cachix.org-1:8psDu5SA5dAD7qA0zMy5UT292TxeEPzIz8VVEr2Js20="
|
|
"nixos-raspberrypi.cachix.org-1:4iMO9LXa8BqhU+Rpg6LQKiGa2lsNh/j2oiYLNOQ5sPI="
|
|
];
|
|
};
|
|
})
|
|
];
|
|
};
|
|
|
|
# ── Arbitrary x86_64 PC ──
|
|
pc = mkHost {
|
|
system = "x86_64-linux";
|
|
modules = [
|
|
./hosts/pc/hardware-configuration.nix # generated on the PC
|
|
({ config, ... }: {
|
|
networking.hostName = "pc";
|
|
boot.loader.systemd-boot.enable = true;
|
|
boot.loader.efi.canTouchEfiVariables = true; # normal x86 UEFI
|
|
|
|
# NVIDIA (RTX 20-series or newer → open kernel module).
|
|
services.xserver.videoDrivers = [ "nvidia" ];
|
|
hardware.graphics.enable = true; # OpenGL/Vulkan userspace (was hardware.opengl)
|
|
hardware.nvidia = {
|
|
modesetting.enable = true; # required for Wayland/Hyprland
|
|
open = true; # open kernel module (Turing+)
|
|
nvidiaSettings = true;
|
|
package = config.boot.kernelPackages.nvidiaPackages.stable;
|
|
};
|
|
})
|
|
];
|
|
};
|
|
};
|
|
|
|
# `nix develop` on either arch.
|
|
devShells = nixpkgs.lib.genAttrs [ "aarch64-linux" "x86_64-linux" ] (system: {
|
|
default = nixpkgs.legacyPackages.${system}.mkShell {
|
|
packages = [ nixpkgs.legacyPackages.${system}.nodejs ];
|
|
};
|
|
});
|
|
};
|
|
}
|