Many fixes

README.md

@@ -49,25 +49,88 @@ Partition the disk:
 parted --script /dev/nvme0n1 -- mklabel gpt mkpart esp fat32 1MiB 512MiB mkpart primary 512MiB 100% set 1 boot on
 ```
 
-Create an encrypted pool:
+Create an encrypted pool. The `-O` flags set filesystem properties that every
+dataset inherits, so they only need to be given once here:
 ```bash
-zpool create -f -o ashift=12 -O encryption=on -O keyformat=passphrase -O mountpoint=none rpool /dev/nvme0n1p2
+zpool create -f \
+    -o ashift=12 \
+    -o autotrim=on \
+    -O encryption=on -O keyformat=passphrase \
+    -O compression=zstd \
+    -O dnodesize=auto \
+    -O xattr=sa \
+    -O acltype=posixacl \
+    -O relatime=on \
+    -O redundant_metadata=most \
+    -O mountpoint=none \
+    rpool /dev/nvme0n1p2
 ```
 
-Create a root partition:
+Create the datasets. Keeping `/nix` separate from `/` means the store can be
+excluded from snapshot and rollback policy, which is what makes an
+erase-your-darlings setup possible later:
 ```bash
 zfs create -o mountpoint=legacy rpool/root
-mkdir -p /mnt
-mount -t zfs rpool/root /mnt
+zfs create -o mountpoint=legacy rpool/nix
+zfs create -o mountpoint=legacy rpool/home
+zfs create -o mountpoint=legacy -o recordsize=1M rpool/Storage
+zfs create -o mountpoint=none -o refreservation=2G rpool/reserved
 ```
 
-And home partition:
+Mount them:
 ```bash
-zfs create -o mountpoint=legacy -o compression=on rpool/home
-mkdir -p /mnt/home
+mkdir -p /mnt
+mount -t zfs rpool/root /mnt
+mkdir -p /mnt/nix /mnt/home /mnt/Storage
+mount -t zfs rpool/nix /mnt/nix
 mount -t zfs rpool/home /mnt/home
+mount -t zfs rpool/Storage /mnt/Storage
 ```
 
+#### Why these properties
+
+Some of these can only be chosen when the pool or dataset is created, so they
+are worth getting right the first time.
+
+Creation-only, no way to change later without recreating the dataset:
+
+- `encryption` and `keyformat` enable native ZFS encryption. This cannot be
+  turned on afterwards.
+- `dnodesize=auto` allows dnodes larger than 512 bytes. Combined with
+  `xattr=sa` this keeps extended attributes inline instead of spilling into
+  separate blocks, which matters for a Nix store holding a hundred thousand
+  small files. Existing files keep whatever size they were written with.
+- `ashift=12` matches the 4K physical sector size of modern NVMe drives.
+
+Changeable later, but only applied to newly written blocks:
+
+- `compression=zstd` gives a better ratio than the `lz4` that plain
+  `compression=on` selects. The Nix store compresses particularly well.
+- `acltype=posixacl` is needed for systemd-journald to grant journal access
+  through ACLs. With the default of `off` that mechanism silently does nothing.
+- `redundant_metadata=most` reduces the number of duplicate metadata writes.
+- `recordsize=1M` suits bulk file storage. Leave it at the 128K default for
+  general purpose datasets, and drop it to 16K for databases or VM images.
+- `autotrim=on` issues TRIM continuously. The `zpool-trim.timer` unit that
+  NixOS enables covers this periodically instead, so either approach works.
+
+The `rpool/reserved` dataset never gets mounted. Its `refreservation` holds
+space back so that the pool can be brought below its full mark by destroying
+that one dataset. ZFS performance degrades noticeably above roughly 80%
+capacity.
+
+On a single disk pool there is no redundancy, so ZFS can detect corruption but
+never repair it. Setting `copies=2` on the datasets that hold irreplaceable
+data stores a second copy of each block at the cost of double the space:
+```bash
+zfs set copies=2 rpool/home
+```
+
+Snapshots are configured through `services.sanoid` in `hosts/Common/zfs.nix`.
+ZFS dataset names are case sensitive, so an entry there has to match the
+dataset exactly. A name that does not resolve leaves that dataset with no
+snapshots at all while the service still reports success.
+
 Format the boot partition:
 ```bash
 mkfs.fat -F 32 -n BOOT /dev/nvme0n1p1
@@ -112,7 +175,7 @@ sudo nixos-install --impure --flake git+https://git.thomasave.be/thomasave/Dotfi
 
 Clean-up:
 ```bash
-umount /mnt/{home,boot}
+umount /mnt/{home,nix,Storage,boot}
 umount /mnt
 ```
 

flake.nix

@@ -40,7 +40,7 @@
       ({pkgs, ...}: {
         nixpkgs.config.allowUnfree = true;
         networking.hostName = host;
-        time.timeZone = "Europe/Brussels";
+        time.timeZone = "Asia/Bangkok";
         nix.settings = {
           substituters = [
             "https://nix-community.cachix.org"
@@ -56,6 +56,13 @@
           keep-derivations = true;
           auto-optimise-store = true;
         };
+
+        # Resolve the bare "nixpkgs" flakeref to the exact revision this system
+        # was built from. Dev shells that use it then reuse the store paths the
+        # system already has, rather than each locking its own nixos-unstable
+        # snapshot and pulling in a duplicate toolchain.
+        nix.registry.nixpkgs.flake = nixpkgs;
+        nix.nixPath = ["nixpkgs=${nixpkgs}"];
         users.users.${user} = {
           isNormalUser = true;
           extraGroups = ["wheel" "video"]; # Enable 'sudo' for the user.

home/Aloria.nix

@@ -26,20 +26,11 @@ in {
 
   home.packages = with pkgs; [
     jetbrains.pycharm
-    rclone
-    opencode
-    claude-code
-    # zed-editor
-    uv
     google-cloud-sdk
     awscli2
     distrobox
-    gnome-disk-utility
-    moonlight-qt
     vscode
     texliveFull
-    gnome-power-manager
-    smile
     podman-compose
     vesktop
     sox

home/ags/files/Bar.tsx

@@ -1,6 +1,13 @@
 import { Astal, Gdk, Gtk } from "ags/gtk4";
 import app from "ags/gtk4/app";
-import { createBinding, createState, For, With, Accessor } from "ags";
+import {
+    createBinding,
+    createComputed,
+    createState,
+    For,
+    With,
+    Accessor,
+} from "ags";
 import { createPoll } from "ags/time";
 import { subprocess, execAsync } from "ags/process";
 import Pango from "gi://Pango";
@@ -275,56 +282,55 @@ function Icons() {
     );
 }
 
-function Volume(): JSX.Element {
-    if (!wirePlumber) return <box />;
+function SpeakerButton({ speaker }: { speaker: Wp.Endpoint }): JSX.Element {
+    const volume = createBinding(speaker, "volume");
+    const mute = createBinding(speaker, "mute");
 
-    const audio = wirePlumber.audio;
-    const icon = createBinding(audio.default_speaker, "volume").as((volume) => {
-        const vol = volume * 100;
-        const icon = [
+    const icon = volume.as((vol) => {
+        const percentage = vol * 100;
+        const level = [
             [101, "overamplified"],
             [67, "high"],
             [34, "medium"],
             [1, "low"],
             [0, "muted"],
-        ].find(([threshold]) => Number(threshold) <= vol)?.[1];
-        return `audio-volume-${icon}-symbolic`;
+        ].find(([threshold]) => Number(threshold) <= percentage)?.[1];
+        return `audio-volume-${level}-symbolic`;
     });
-    const css = createBinding(audio.default_speaker, "mute").as((mute) => {
-        return mute ? "margin-left:0;" : "margin-left: 0.7em;";
-    });
-    let volume = createBinding(audio.default_speaker, "volume");
-    let mute = createBinding(audio.default_speaker, "mute");
+    const label = createComputed(() =>
+        mute() ? "" : `${Math.floor(volume() * 100)}%`,
+    );
+    const css = mute.as((muted) =>
+        muted ? "margin-left: 0;" : "margin-left: 0.7em;",
+    );
+
     return (
-        <button
-            class="item blue"
-            onClicked={() =>
-                (audio.default_speaker.mute = !audio.default_speaker.mute)
-            }
-        >
+        <button class="item blue" onClicked={() => (speaker.mute = !speaker.mute)}>
             <box>
                 <image iconName={icon} />
-                <With value={volume}>
-                    {(vol) => (
-                        <box>
-                            <With value={mute}>
-                                {(muted) => {
-                                    return (
-                                        <label
-                                            label={muted ? "" : `${Math.floor(vol * 100)}%`}
-                                            css={css}
-                                        />
-                                    );
-                                }}
-                            </With>
-                        </box>
-                    )}
-                </With>
+                <label label={label} css={css} />
             </box>
         </button>
     );
 }
 
+function Volume(): JSX.Element {
+    if (!wirePlumber) return <box />;
+
+    // WirePlumber swaps out the whole endpoint object whenever the default
+    // sink changes, e.g. when a Bluetooth headset connects. Binding to the
+    // endpoint that happened to be default at startup leaves the widget stuck
+    // on that device forever, so track the property and rebuild on every swap.
+    const speaker = createBinding(wirePlumber.audio, "defaultSpeaker");
+    return (
+        <With value={speaker}>
+            {(endpoint: Wp.Endpoint | null) =>
+                endpoint ? <SpeakerButton speaker={endpoint} /> : <box />
+            }
+        </With>
+    );
+}
+
 function Workspaces({ connector }: { connector: string }): JSX.Element {
     return (
         <box class="workspaces">

home/helium/default.nix

@@ -8,7 +8,7 @@
         sha256 = "sha256-qzc135IP5F2btxtOMUGMz+0azJhYL9KI0lcPG2KjcxU=";
       };
       extraPkgs = pkgs: [pkgs.tzdata];
-      profile = "export TZ=Europe/Brussels";
+      profile = "export TZ=Asia/Bangkok";
     })
   ];
   xdg.desktopEntries = {

home/utils/common.nix

@@ -32,6 +32,8 @@
     ncdu
     jq
     rclone
+    claude-code
+    uv
   ];
   home.sessionVariables = {
     XDG_CONFIG_HOME = "${config.xdg.configHome}";

home/waybar/default.nix

@@ -46,12 +46,12 @@
         "hyprland/window" = {max-length = 50;};
         tray = {spacing = 10;};
         "clock#clock2" = {
-          timezone = "Europe/Brussels";
+          timezone = "Asia/Bangkok";
           format = "{:%H:%M:%S}";
           interval = 1;
         };
         clock = {
-          timezone = "Europe/Brussels";
+          timezone = "Asia/Bangkok";
           format = "{:%Y-%m-%d}";
           interval = 3600;
         };

hosts/Aloria/default.nix

@@ -177,6 +177,11 @@ in {
     ];
     authKeyFile = "/home/user/.secrets/Tailscale/Aloria/authkey";
   };
+  programs.winbox = {
+    enable = true;
+    openFirewall = true;
+  };
+
   services.usbmuxd.enable = true;
   environment.systemPackages = with pkgs; [
     libcamera

hosts/Common/desktop.nix

@@ -9,6 +9,11 @@
       vulkan-loader
       vulkan-validation-layers
       vulkan-extension-layer
+      wiremix
+      gnome-disk-utility
+      moonlight-qt
+      gnome-power-manager
+      smile
     ];
   };
   # programs.hyprland = {

hosts/Common/zfs.nix

@@ -17,7 +17,7 @@
         autoprune = true;
         autosnap = true;
       };
-      "rpool/storage" = {
+      "rpool/Storage" = {
         frequently = 8;
         yearly = 0;
         monthly = 0;