Add skycam host

Flake lock file updates:

• Updated input 'secrets':
    'git+ssh://git@git.vimium.com/jordan/nix-secrets.git?ref=refs/heads/master&rev=f8d68b934f4380ecbc6365b4ef7f7c632833d1aa' (2024-07-08)
  → 'git+ssh://git@git.vimium.com/jordan/nix-secrets.git?ref=refs/heads/master&rev=dfe0e95be5ef539bf28602ff47beeea26cc4d1b8' (2024-08-03)

flake.lock

@@ -490,11 +490,11 @@
     },
     "nixpkgs_3": {
       "locked": {
-        "lastModified": 1722372011,
+        "lastModified": 1722519197,
-        "narHash": "sha256-B2xRiC3NEJy/82ugtareBkRqEkPGpMyjaLxaR8LBxNs=",
+        "narHash": "sha256-VEdJmVU2eLFtLqCjTYJd1J7+Go8idAcZoT11IewFiRg=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "cf05eeada35e122770c5c14add958790fcfcbef5",
+        "rev": "05405724efa137a0b899cce5ab4dde463b4fd30b",
         "type": "github"
       },
       "original": {
@@ -541,11 +541,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1722626928,
+        "lastModified": 1722693897,
-        "narHash": "sha256-qr1ylMvSPC7DviCbGtcd4WtbfMcQQY0eAWI1c1YiR0Q=",
+        "narHash": "sha256-Gpa3Gf60AqshNJKUP5mAmVImFFQ6BsWG+zbqx0JGFD4=",
         "owner": "nix-community",
         "repo": "plasma-manager",
-        "rev": "0f74ec3c3768a42cba04d8d84b65c62c815f804e",
+        "rev": "b17a2666bcf400cf245528d143597d1480e298f8",
         "type": "github"
       },
       "original": {
@@ -576,11 +576,11 @@
     "secrets": {
       "flake": false,
       "locked": {
-        "lastModified": 1720459643,
+        "lastModified": 1722712220,
-        "narHash": "sha256-X71/NplPXPe9pCvrd9ELpnYBEYtju4+x3LA7S5I1GXM=",
+        "narHash": "sha256-gEmbk/DROfVZ+v/BAZHDloHzS0KdqIzxtW7z9g2eH4Y=",
         "ref": "refs/heads/master",
-        "rev": "f8d68b934f4380ecbc6365b4ef7f7c632833d1aa",
+        "rev": "dfe0e95be5ef539bf28602ff47beeea26cc4d1b8",
-        "revCount": 21,
+        "revCount": 22,
         "type": "git",
         "url": "ssh://git@git.vimium.com/jordan/nix-secrets.git"
       },

flake.nix

@@ -104,6 +104,7 @@
         mail = mkNixosSystem { system = "x86_64-linux"; name = "mail"; };
         odyssey = mkNixosSystem { system = "x86_64-linux"; name = "odyssey"; };
         pi = mkNixosSystem { system = "aarch64-linux"; name = "pi"; extraModules = [ nixos-hardware.nixosModules.raspberry-pi-4 ]; };
+        skycam = mkNixosSystem { system = "aarch64-linux"; name = "skycam"; extraModules = [ nixos-hardware.nixosModules.raspberry-pi-4 ]; };
         vps1 = mkNixosSystem { system = "x86_64-linux"; name = "vps1"; };
       };
 

hosts/common.nix

@@ -1,4 +1,4 @@
-{ config, lib, pkgs, ... }:
+{ config, pkgs, ... }:
 
 {
   time.timeZone = "Europe/London";

hosts/skycam/README.md

@@ -0,0 +1,22 @@
+# Skycam
+
+## Overview
+Raspberry Pi 4-based webcam
+
+## Specs
+* SoC - Broadcom BCM2711
+* CPU - ARM Cortex-A72 @ 1.8 GHz
+* Memory - 8 GB LPDDR4
+
+### Disks
+Device | Partitions _(filesystem, usage)_
+--- | ---
+SD card | `/dev/mmcblk0` (ext4, NixOS Root)
+
+### Networks
+- DHCP on `10.0.1.0/24` subnet.
+- Tailscale on `100.64.0.0/10` subnet. FQDN: `pi.mesh.vimium.net`.
+
+## Devices and connections
+- Camera Module 3 with wide-angle lens
+

hosts/skycam/default.nix

@@ -0,0 +1,71 @@
+{ config, pkgs, ... }:
+
+{
+  imports = [
+    ./hardware-configuration.nix
+    ../server.nix
+  ];
+
+  hardware = {
+    raspberry-pi."4" = {
+      apply-overlays-dtmerge.enable = true;
+      audio.enable = false;
+      fkms-3d.enable = true;    # VideoCore with 512 MB CMA reservation
+      tc358743.enable = true;   # HDMI-to-CSI-2 converter
+      xhci.enable = false;
+    };
+    firmware = with pkgs; [
+      firmwareLinuxNonfree
+      wireless-regdb
+    ];
+  };
+
+  networking = {
+    hostId = "731d1660";
+    firewall = {
+      enable = true;
+      allowedTCPPorts = [ 8080 ];
+      allowedUDPPorts = [ 8080 ];
+    };
+  };
+
+  systemd.services.ustreamer = {
+    enable = true;
+    description = "uStreamer service";
+    unitConfig = {
+      Type = "simple";
+    };
+    serviceConfig = {
+      ExecStartPre = ''${pkgs.v4l-utils}/bin/v4l2-ctl \
+        --device=/dev/video0 \
+        --fix-edid-checksums \
+        --info-edid
+      '';
+      ExecStart = ''${pkgs.unstable.ustreamer}/bin/ustreamer \
+        --device=/dev/video0 \
+        --resolution=1280x720 \
+        --format=uyvy \
+        --encoder=m2m-image \
+        --workers=3 \
+        --persistent \
+        --dv-timings \
+        --drop-same-frames=30 \
+        --host=0.0.0.0 \
+        --port=8080
+      '';
+    };
+    wantedBy = [ "network-online.target" ];
+    confinement.mode = "chroot-only";
+  };
+
+  environment.systemPackages = with pkgs; [
+    git
+    neovim
+    libraspberrypi
+    raspberrypi-eeprom
+    v4l-utils
+    unstable.ustreamer
+  ];
+
+  system.stateVersion = "22.11";
+}

hosts/skycam/hardware-configuration.nix

@@ -0,0 +1,28 @@
+{ config, lib, modulesPath, ... }:
+
+{
+  imports = [
+    (modulesPath + "/installer/sd-card/sd-image-aarch64.nix")
+  ];
+
+  boot = {
+    supportedFilesystems = lib.mkForce [ "f2fs" "vfat xfs" ];
+    tmp.cleanOnBoot = true;
+  };
+
+  nixpkgs.overlays = [
+    (final: super: {
+      makeModulesClosure = x:
+        super.makeModulesClosure (x // { allowMissing = true; });
+    })
+  ];
+
+  fileSystems = {
+    "/" = {
+      device = "/dev/disk/by-label/NIXOS_SD";
+      fsType = "ext4";
+      options = [ "noatime" ];
+    };
+  };
+}
+