Add daily auto-update workflow with shared build script

Replace nix-serve-only setup with Attic for managed binary caching with
upstream filtering and GC. Move gitea actions runner from host into an
isolated NixOS container with private networking. nix-serve kept alongside
Attic during migration.

.gitea/scripts/build-and-cache.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Configure Attic cache
+attic login local "$ATTIC_ENDPOINT" "$ATTIC_TOKEN"
+attic use local:nixos
+
+# Check flake
+nix flake check --all-systems --print-build-logs --log-format raw --show-trace
+
+# Build all systems
+nix eval .#nixosConfigurations --apply 'cs: builtins.attrNames cs' --json \
+  | jq -r '.[]' \
+  | xargs -I{} nix build ".#nixosConfigurations.{}.config.system.build.toplevel" \
+      --no-link --print-build-logs --log-format raw
+
+# Push to cache (only locally-built paths >= 0.5MB)
+toplevels=$(nix eval .#nixosConfigurations \
+  --apply 'cs: map (n: "${cs.${n}.config.system.build.toplevel}") (builtins.attrNames cs)' \
+  --json | jq -r '.[]')
+echo "Found $(echo "$toplevels" | wc -l) system toplevels"
+paths=$(echo "$toplevels" \
+  | xargs nix path-info -r --json \
+  | jq -r '[to_entries[] | select(
+      (.value.signatures | all(startswith("cache.nixos.org") | not))
+      and .value.narSize >= 524288
+    ) | .key] | unique[]')
+echo "Pushing $(echo "$paths" | wc -l) unique paths to cache"
+echo "$paths" | xargs attic push local:nixos

.gitea/workflows/auto-update.yaml

@@ -0,0 +1,42 @@
+name: Auto Update Flake
+on:
+  schedule:
+    - cron: '0 6 * * *'
+  workflow_dispatch: {}
+
+env:
+  DEBIAN_FRONTEND: noninteractive
+  PATH: /run/current-system/sw/bin/
+  XDG_CONFIG_HOME: ${{ runner.temp }}/.config
+  ATTIC_ENDPOINT: ${{ vars.ATTIC_ENDPOINT }}
+  ATTIC_TOKEN: ${{ secrets.ATTIC_TOKEN }}
+
+jobs:
+  auto-update:
+    runs-on: nixos
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+          ref: master
+
+      - name: Update flake inputs
+        run: nix flake update --commit-lock-file
+
+      - name: Build and cache
+        run: bash .gitea/scripts/build-and-cache.sh
+
+      - name: Push updated lockfile
+        run: git push
+
+      - name: Notify on failure
+        if: failure()
+        run: |
+          curl -s \
+            -H "Authorization: Bearer ${{ secrets.NTFY_TOKEN }}" \
+            -H "Title: Flake auto-update failed" \
+            -H "Priority: high" \
+            -H "Tags: warning" \
+            -d "Auto-update workflow failed. Check: ${{ gitea.server_url }}/${{ gitea.repository }}/actions/runs/${{ gitea.run_id }}" \
+            ntfy.neet.dev/nix-flake-updates

.gitea/workflows/check-flake.yaml

@@ -6,6 +6,8 @@ env:
   DEBIAN_FRONTEND: noninteractive
   PATH: /run/current-system/sw/bin/
   XDG_CONFIG_HOME: ${{ runner.temp }}/.config
+  ATTIC_ENDPOINT: ${{ vars.ATTIC_ENDPOINT }}
+  ATTIC_TOKEN: ${{ secrets.ATTIC_TOKEN }}
 
 jobs:
   check-flake:
@@ -16,34 +18,5 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Configure Attic cache
-        run: |
-          attic login local "${{ vars.ATTIC_ENDPOINT }}" "${{ secrets.ATTIC_TOKEN }}"
-          attic use local:nixos
-
-      - name: Check Flake
-        run: nix flake check --all-systems --print-build-logs --log-format raw --show-trace
-
-      - name: Build all systems
-        run: |
-          nix eval .#nixosConfigurations --apply 'cs: builtins.attrNames cs' --json \
-            | jq -r '.[]' \
-            | xargs -I{} nix build ".#nixosConfigurations.{}.config.system.build.toplevel" --no-link --print-build-logs --log-format raw
-
-      - name: Push to cache
-        run: |
-          set -euo pipefail
-          # Get all system toplevel store paths
-          toplevels=$(nix eval .#nixosConfigurations --apply 'cs: map (n: "${cs.${n}.config.system.build.toplevel}") (builtins.attrNames cs)' --json | jq -r '.[]')
-          echo "Found $(echo "$toplevels" | wc -l) system toplevels"
-          # Expand to full closures, deduplicate, and filter out paths that are:
-          # - already signed by cache.nixos.org (available upstream)
-          # - smaller than 0.5MB (insignificant build artifacts)
-          paths=$(echo "$toplevels" \
-            | xargs nix path-info -r --json \
-            | jq -r '[to_entries[] | select(
-                (.value.signatures | all(startswith("cache.nixos.org") | not))
-                and .value.narSize >= 524288
-              ) | .key] | unique[]')
-          echo "Pushing $(echo "$paths" | wc -l) unique paths to cache"
-          echo "$paths" | xargs attic push local:nixos
+      - name: Build and cache
+        run: bash .gitea/scripts/build-and-cache.sh

common/binary-cache.nix

@@ -10,7 +10,7 @@
       ];
       trusted-public-keys = [
         "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
-        "nixos:SnTTQutdOJbAmxo6AQ3cbRt5w9f4byMXQODCieBH3PQ="
+        "nixos:e5AMCUWWEX9MESWAAMjBkZdGUpl588NhgsUO3HsdhFw="
       ];
 
       # Allow substituters to be offline

common/nix-builder.nix

@@ -4,8 +4,8 @@ let
   builderUserName = "nix-builder";
 
   builderRole = "nix-builder";
-  builders = config.machines.withRole.${builderRole};
-  thisMachineIsABuilder = config.thisMachine.hasRole.${builderRole};
+  builders = config.machines.withRole.${builderRole} or [];
+  thisMachineIsABuilder = config.thisMachine.hasRole.${builderRole} or false;
 
   # builders don't include themselves as a remote builder
   otherBuilders = lib.filter (hostname: hostname != config.networking.hostName) builders;

common/server/default.nix

@@ -16,5 +16,6 @@
     ./librechat.nix
     ./actualbudget.nix
     ./unifi.nix
+    ./ntfy.nix
   ];
 }

common/server/ntfy.nix

@@ -0,0 +1,40 @@
+{ lib, config, ... }:
+
+let
+  cfg = config.services.ntfy-sh;
+in
+{
+  options.services.ntfy-sh = {
+    hostname = lib.mkOption {
+      type = lib.types.str;
+      example = "ntfy.example.com";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.ntfy-sh.settings = {
+      base-url = "https://${cfg.hostname}";
+      listen-http = "127.0.0.1:2586";
+      auth-default-access = "deny-all";
+      auth-file = "/var/lib/ntfy-sh/user.db";
+      behind-proxy = true;
+      enable-login = true;
+      attachment-cache-dir = "/var/lib/ntfy-sh/attachments";
+    };
+
+    # backups
+    backup.group."ntfy".paths = [
+      "/var/lib/ntfy-sh"
+    ];
+
+    services.nginx.enable = true;
+    services.nginx.virtualHosts.${cfg.hostname} = {
+      enableACME = true;
+      forceSSL = true;
+      locations."/" = {
+        proxyPass = "http://127.0.0.1:2586";
+        proxyWebsockets = true;
+      };
+    };
+  };
+}

common/server/samba.nix

@@ -26,6 +26,16 @@
           "printcap name" = "cups";
 
           "hide files" = "/.nobackup/.DS_Store/._.DS_Store/";
+
+          # Samba 4.22+ enables SMB3 directory leases by default, allowing clients
+          # to cache directory listings locally. When files are created locally on
+          # the server (bypassing Samba), these cached listings go stale because
+          # kernel oplocks — the mechanism that would break leases on local
+          # changes — is incompatible with smb2 leases. Enabling kernel oplocks
+          # would fix this but forces Samba to disable smb2 leases, durable
+          # handles, and level2 oplocks, losing handle caching performance.
+          # https://wiki.samba.org/index.php/Editing_files_locally_on_server:_interoperability
+          "smb3 directory leases" = "no";
         };
         public = {
           path = "/data/samba/Public";

flake.nix

@@ -175,10 +175,10 @@
             kexec = (mkEphemeral "x86_64-linux").config.system.build.images.kexec;
             iso = (mkEphemeral "x86_64-linux").config.system.build.images.iso;
           };
-          "aarch64-linux" = {
-            kexec = (mkEphemeral "aarch64-linux").config.system.build.images.kexec;
-            iso = (mkEphemeral "aarch64-linux").config.system.build.images.iso;
-          };
+          # "aarch64-linux" = {
+          #   kexec = (mkEphemeral "aarch64-linux").config.system.build.images.kexec;
+          #   iso = (mkEphemeral "aarch64-linux").config.system.build.images.iso;
+          # };
         };
 
       overlays.default = import ./overlays { inherit inputs; };

machines/phil/default.nix

@@ -1,9 +0,0 @@
-{ lib, ... }:
-
-{
-  imports = [
-    ./hardware-configuration.nix
-  ];
-
-  networking.hostName = "phil";
-}

machines/phil/hardware-configuration.nix

@@ -1,46 +0,0 @@
-# Do not modify this file!  It was generated by ‘nixos-generate-config’
-# and may be overwritten by future invocations.  Please make changes
-# to /etc/nixos/configuration.nix instead.
-{ lib, modulesPath, ... }:
-
-{
-  imports =
-    [
-      (modulesPath + "/profiles/qemu-guest.nix")
-    ];
-
-  # because grub just doesn't work for some reason
-  boot.loader.systemd-boot.enable = true;
-
-  remoteLuksUnlock.enable = true;
-  remoteLuksUnlock.enableTorUnlock = false;
-
-  boot.initrd.availableKernelModules = [ "xhci_pci" ];
-  boot.initrd.kernelModules = [ "dm-snapshot" ];
-  boot.kernelModules = [ ];
-  boot.extraModulePackages = [ ];
-
-  boot.initrd.luks.devices."enc-pv" = {
-    device = "/dev/disk/by-uuid/d26c1820-4c39-4615-98c2-51442504e194";
-    allowDiscards = true;
-  };
-
-  fileSystems."/" =
-    {
-      device = "/dev/disk/by-uuid/851bfde6-93cd-439e-9380-de28aa87eda9";
-      fsType = "btrfs";
-    };
-
-  fileSystems."/boot" =
-    {
-      device = "/dev/disk/by-uuid/F185-C4E5";
-      fsType = "vfat";
-    };
-
-  swapDevices =
-    [{ device = "/dev/disk/by-uuid/d809e3a1-3915-405a-a200-4429c5efdf87"; }];
-
-  networking.interfaces.enp0s6.useDHCP = lib.mkDefault true;
-
-  nixpkgs.hostPlatform = lib.mkDefault "aarch64-linux";
-}

machines/phil/properties.nix

@@ -1,20 +0,0 @@
-{
-  hostNames = [
-    "phil"
-    "phil.neet.dev"
-  ];
-
-  arch = "aarch64-linux";
-
-  systemRoles = [
-    "server"
-    "nix-builder"
-  ];
-
-  hostKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBlgRPpuUkZqe8/lHugRPm/m2vcN9psYhh5tENHZt9I2";
-
-  remoteUnlock = {
-    hostKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIK0RodotOXLMy/w70aa096gaNqPBnfgiXR5ZAH4+wGzd";
-    clearnetHost = "unlock.phil.neet.dev";
-  };
-}

machines/ponyo/default.nix

@@ -108,4 +108,8 @@
   # librechat
   services.librechat-container.enable = true;
   services.librechat-container.host = "chat.neet.dev";
+
+  # push notifications
+  services.ntfy-sh.enable = true;
+  services.ntfy-sh.hostname = "ntfy.neet.dev";
 }