feat: bidirectional remote builders — server <> uConsole

Add reusable remote-builder NixOS module and builder system user.

Server (lazyworkhorse): dispatches aarch64-linux builds to uConsole
uConsole: dispatches x86_64-linux builds to server

The builder user uses the same SSH keypair on both hosts for
symmetric remote building. Generate the key with:
  ssh-keygen -t ed25519 -f /etc/ssh/builder_key -N ""
Add the public key to lib/keys.nix (replace PLACEHOLDER).

assets/ollama/Dockerfile

@@ -0,0 +1,106 @@
+# ollama-gfx906/Dockerfile
+#
+# Custom ollama image with ROCm 6.1 + gfx906 (MI50) support.
+# The official ollama/rocm image ships ROCm 7.2 which dropped gfx906.
+# This uses v0.23.2's native CMake build system with AMDGPU_TARGETS including gfx906.
+#
+# Build: docker build -t ollama/ollama:rocm-gfx906 ai/ollama
+
+FROM rocm/dev-ubuntu-22.04:6.1.2-complete AS builder
+
+# Build dependencies (CMake, Ninja, Go)
+ARG CMAKEVERSION=3.31.2
+ARG NINJAVERSION=1.12.1
+ARG GOLANG_VERSION=1.22.0
+
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+    curl git ccache build-essential pkg-config unzip \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install CMake from official binaries
+RUN curl -fsSL https://github.com/Kitware/CMake/releases/download/v${CMAKEVERSION}/cmake-${CMAKEVERSION}-linux-x86_64.tar.gz \
+    | tar xz -C /usr/local --strip-components 1
+
+# Install Ninja
+RUN curl -fsSL -o /tmp/ninja.zip \
+    https://github.com/ninja-build/ninja/releases/download/v${NINJAVERSION}/ninja-linux.zip \
+    && unzip /tmp/ninja.zip -d /usr/local/bin && rm /tmp/ninja.zip
+
+# Install Go
+RUN curl -fsSL https://go.dev/dl/go${GOLANG_VERSION}.linux-amd64.tar.gz \
+    | tar xz -C /usr/local
+ENV PATH=/usr/local/go/bin:$PATH
+
+ARG OLLAMA_VERSION=v0.23.2
+RUN git clone --depth 1 --branch ${OLLAMA_VERSION} https://github.com/ollama/ollama.git /build
+WORKDIR /build
+
+# ROCm paths
+ENV HIP_PATH=/opt/rocm
+ENV ROCM_PATH=/opt/rocm
+ENV CMAKE_GENERATOR=Ninja
+ENV LDFLAGS=-s
+
+# Step 1: Build CPU backends with GCC (no ROCm preset)
+# Pre-set CMAKE_HIP_COMPILER="" to prevent check_language(HIP) from
+# finding a HIP compiler (it searches /opt/rocm even without PATH).
+# Remove /opt/rocm from PATH to prevent find_program from finding hipcc.
+RUN mkdir -p build-cpu && \
+    PATH=/usr/local/go/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin \
+    cmake -B build-cpu -DCMAKE_BUILD_TYPE=Release \
+      -DCMAKE_HIP_COMPILER="" \
+      -DCMAKE_INSTALL_PREFIX=/build/dist && \
+    cmake --build build-cpu --target ggml-cpu -- -l $(nproc) && \
+    cmake --install build-cpu --component CPU --strip && \
+    echo "=== CPU install ===" && \
+    (find /build/dist/lib/ollama -type f -o -type l 2>&1 | head -20 || echo "empty")
+
+# Step 2: Build HIP backend with ROCm preset + gfx906 target only
+# The ROCm 6 preset enables HIP language detection (enable_language(HIP))
+# which ensures GPU kernels are properly compiled for gfx906.
+# OLLAMA_RUNNER_DIR=rocm from the preset, so HIP goes to lib/ollama/rocm/
+# Need CMAKE_PREFIX_PATH so find_package(hip) finds hip-config.cmake
+# at /opt/rocm/lib/cmake/hip/hip-config.cmake.
+RUN mkdir -p build-hip && \
+    cmake -B build-hip \
+      --preset 'ROCm 6' \
+      -DAMDGPU_TARGETS="gfx906:xnack-" \
+      -DCMAKE_BUILD_TYPE=Release \
+      -DCMAKE_PREFIX_PATH="/opt/rocm" && \
+    cmake --build build-hip --target ggml-hip -- -l $(nproc) && \
+    cmake --install build-hip --component HIP --strip && \
+    echo "=== HIP install ===" && \
+    find /build/dist/lib/ollama -type f -o -type l | head -20
+
+# Step 3: Build Go binary (GCC for CGo linking)
+ENV CGO_ENABLED=1
+RUN go build -trimpath -ldflags="-X=github.com/ollama/ollama/version.Version=${OLLAMA_VERSION}" -o /build/dist/ollama .
+
+# ---------- Runtime image ----------
+FROM ubuntu:24.04
+
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+    ca-certificates curl libstdc++6 libgomp1 libvulkan1 libopenblas0 \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy ROCm 6.1 runtime libraries
+# These are needed at runtime by ggml-hip via LD_LIBRARY_PATH
+COPY --from=builder /opt/rocm/lib/ /opt/rocm/lib/
+COPY --from=builder /opt/rocm/share/ /opt/rocm/share/
+
+# Copy ollama binary + all backends (CPU + HIP)
+# CPU install:  /build/dist/lib/ollama/libggml-*.so
+# HIP install:  /build/dist/lib/ollama/rocm/libggml-hip.so
+COPY --from=builder /build/dist/ollama /usr/bin/ollama
+COPY --from=builder /build/dist/lib/ollama/ /usr/lib/ollama/
+
+RUN ldconfig
+
+ENV LD_LIBRARY_PATH=/opt/rocm/lib:/usr/lib/ollama/rocm:/usr/lib/ollama
+ENV HSA_OVERRIDE_GFX_VERSION=9.0.6
+ENV HCC_AMDGPU_TARGET=gfx906
+ENV HSA_ENABLE_SDMA=0
+
+EXPOSE 11434
+ENTRYPOINT ["/bin/ollama"]
+CMD ["serve"]

flake.lock

@@ -23,38 +23,6 @@
         "type": "github"
       }
     },
-    "argononed": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1729566243,
-        "narHash": "sha256-DPNI0Dpk5aym3Baf5UbEe5GENDrSmmXVdriRSWE+rgk=",
-        "owner": "nvmd",
-        "repo": "argononed",
-        "rev": "16dbee54d49b66d5654d228d1061246b440ef7cf",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nvmd",
-        "repo": "argononed",
-        "type": "github"
-      }
-    },
-    "argononed_2": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1729566243,
-        "narHash": "sha256-DPNI0Dpk5aym3Baf5UbEe5GENDrSmmXVdriRSWE+rgk=",
-        "owner": "nvmd",
-        "repo": "argononed",
-        "rev": "16dbee54d49b66d5654d228d1061246b440ef7cf",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nvmd",
-        "repo": "argononed",
-        "type": "github"
-      }
-    },
     "flake-compat": {
       "flake": false,
       "locked": {
@@ -69,36 +37,6 @@
         "url": "https://git.lix.systems/lix-project/flake-compat/archive/main.tar.gz"
       }
     },
-    "flake-compat_2": {
-      "locked": {
-        "lastModified": 1767039857,
-        "narHash": "sha256-vNpUSpF5Nuw8xvDLj2KCwwksIbjua2LZCqhV1LNRDns=",
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "rev": "5edf11c44bc78a0d334f6334cdaf7d60d732daab",
-        "type": "github"
-      },
-      "original": {
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "type": "github"
-      }
-    },
-    "flake-compat_3": {
-      "locked": {
-        "lastModified": 1767039857,
-        "narHash": "sha256-vNpUSpF5Nuw8xvDLj2KCwwksIbjua2LZCqhV1LNRDns=",
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "rev": "5edf11c44bc78a0d334f6334cdaf7d60d732daab",
-        "type": "github"
-      },
-      "original": {
-        "owner": "edolstra",
-        "repo": "flake-compat",
-        "type": "github"
-      }
-    },
     "home-manager": {
       "inputs": {
         "nixpkgs": [
@@ -206,130 +144,6 @@
         "type": "github"
       }
     },
-    "nixos-images": {
-      "inputs": {
-        "nixos-stable": [
-          "nixos-raspberrypi",
-          "nixpkgs"
-        ],
-        "nixos-unstable": [
-          "nixos-raspberrypi",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1747747741,
-        "narHash": "sha256-LUOH27unNWbGTvZFitHonraNx0JF/55h30r9WxqrznM=",
-        "owner": "nvmd",
-        "repo": "nixos-images",
-        "rev": "cbbd6db325775096680b65e2a32fb6187c09bbb4",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nvmd",
-        "ref": "sdimage-installer",
-        "repo": "nixos-images",
-        "type": "github"
-      }
-    },
-    "nixos-images_2": {
-      "inputs": {
-        "nixos-stable": [
-          "nixos-uconsole",
-          "nixos-raspberrypi",
-          "nixpkgs"
-        ],
-        "nixos-unstable": [
-          "nixos-uconsole",
-          "nixos-raspberrypi",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1747747741,
-        "narHash": "sha256-LUOH27unNWbGTvZFitHonraNx0JF/55h30r9WxqrznM=",
-        "owner": "nvmd",
-        "repo": "nixos-images",
-        "rev": "cbbd6db325775096680b65e2a32fb6187c09bbb4",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nvmd",
-        "ref": "sdimage-installer",
-        "repo": "nixos-images",
-        "type": "github"
-      }
-    },
-    "nixos-raspberrypi": {
-      "inputs": {
-        "argononed": "argononed",
-        "flake-compat": "flake-compat_2",
-        "nixos-images": "nixos-images",
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1779023229,
-        "narHash": "sha256-MInilg7B/06c34SwOuGSBho4l0H1EZcmvxTkSWCs5pE=",
-        "owner": "nvmd",
-        "repo": "nixos-raspberrypi",
-        "rev": "06c6e3513e1ee64b651913193fc6ac38aa4963f5",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nvmd",
-        "ref": "v1.20260517.0",
-        "repo": "nixos-raspberrypi",
-        "type": "github"
-      }
-    },
-    "nixos-raspberrypi_2": {
-      "inputs": {
-        "argononed": "argononed_2",
-        "flake-compat": "flake-compat_3",
-        "nixos-images": "nixos-images_2",
-        "nixpkgs": [
-          "nixos-uconsole",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1779023229,
-        "narHash": "sha256-MInilg7B/06c34SwOuGSBho4l0H1EZcmvxTkSWCs5pE=",
-        "owner": "nvmd",
-        "repo": "nixos-raspberrypi",
-        "rev": "06c6e3513e1ee64b651913193fc6ac38aa4963f5",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nvmd",
-        "ref": "v1.20260517.0",
-        "repo": "nixos-raspberrypi",
-        "type": "github"
-      }
-    },
-    "nixos-uconsole": {
-      "inputs": {
-        "nixos-raspberrypi": "nixos-raspberrypi_2",
-        "nixpkgs": [
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1780333979,
-        "narHash": "sha256-yjp/gWRqWCxalYLe2+27gbxhttL+46Ozm7qvccpFbv4=",
-        "owner": "nixos-uconsole",
-        "repo": "nixos-uconsole",
-        "rev": "1e6a8dc51c7b26e15850688a0b01121c3fea4b30",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nixos-uconsole",
-        "repo": "nixos-uconsole",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1705033721,
@@ -398,8 +212,6 @@
       "inputs": {
         "agenix": "agenix",
         "lix": "lix",
-        "nixos-raspberrypi": "nixos-raspberrypi",
-        "nixos-uconsole": "nixos-uconsole",
         "nixpkgs": "nixpkgs_2"
       }
     },

flake.nix

@@ -69,9 +69,11 @@
               ./modules/nixos/services/open_code_server.nix
               ./modules/nixos/services/ollama_init_custom_models.nix
               ./modules/nixos/services/openclaw_node.nix
+              ./modules/nixos/services/remote-builder.nix
               ./modules/nixos/security/ai-worker-restricted.nix
               ./users/gortium.nix
               ./users/ai-worker.nix
+              ./users/builder.nix
             ];
           };
 
@@ -100,7 +102,9 @@
               }
               nixos-raspberrypi.nixosModules.raspberry-pi-5.base
               nixos-uconsole.nixosModules.uconsole-cm5
+              ./modules/nixos/services/remote-builder.nix
               ./hosts/uConsole/configuration.nix
+              ./users/builder.nix
               ./hosts/uConsole/hardware-configuration.nix
             ];
           };

hosts/lazyworkhorse/configuration.nix

@@ -144,7 +144,6 @@
   # You can use https://Search.nixos.org/ to find more packages (and options).
   environment.systemPackages = with pkgs; [
     neovim
-    tmux
     docker-compose
     wget
     age
@@ -257,6 +256,12 @@
     # };
   };
 
+  services.opencode = {
+    enable = true;
+    port = 4099;
+    ollamaUrl = "http://127.0.0.1:11434/v1"; 
+  };
+  
   # Private host ssh key managed by agenix
   age = {
     identityPaths = paths.identities;
@@ -306,6 +311,16 @@
     };
   };
 
+  # OpenClaw Node service (host-side execution for Docker gateway)
+  services.openclaw-node = {
+    enable = true;
+    user = "ai-worker";
+    gatewayHost = "127.0.0.1";
+    gatewayPort = 18789;
+    gatewayTokenFile = "/run/secrets/openclaw_gateway_token";
+    displayName = "lazyworkhorse-host";
+  };
+
   # Public host ssh key (kept in sync with the private one)
   environment.etc."ssh/ssh_host_ed25519_key.pub".text =
     "${keys.hosts.lazyworkhorse.main}";
@@ -558,5 +573,23 @@
   # For more information, see `man configuration.nix` or https://nixos.org/manual/nixos/stable/options#opt-system.stateVersion .
   system.stateVersion = "25.05"; # Did you read the comment?
 
+
+  # ============================================================
+  # Remote builder — dispatches aarch64-linux builds to uConsole
+  # ============================================================
+  services.remoteBuilder = {
+    enable = true;
+    machines = [
+      {
+        hostName = "192.168.1.120";
+        port = 22;
+        sshUser = "builder";
+        sshKey = "/etc/ssh/builder_key";
+        systems = [ "aarch64-linux" ];
+        maxJobs = 4;
+      }
+    ];
+  };
+
 }
 

hosts/uConsole/configuration.nix

@@ -168,4 +168,23 @@
   # Reticulum uses its own encryption and doesn't need open ports
   # for basic mesh operations (peer-to-peer discovery).
   # For TCP interfaces, open additional ports as needed.
+
+  # ============================================================
+  # Remote builder — dispatches x86_64-linux builds to server
+  # ============================================================
+  services.remoteBuilder = {
+    enable = true;
+    machines = [
+      {
+        hostName = "lazyworkhorse.net";
+        port = 2424;
+        sshUser = "builder";
+        sshKey = "/etc/ssh/builder_key";
+        systems = [ "x86_64-linux" ];
+        maxJobs = 36;
+        supportedFeatures = [ "benchmark" "big-parallel" "nixos-test" ];
+      }
+    ];
+  };
+
 }

lib/keys.nix

@@ -9,6 +9,13 @@
     ai-worker = {
       main = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAXeGtPPcsP2IYRQNvII41NVWhJsarEk8c4qxs/a5sXf";
     };
+
+    builder = {
+      # Same key on both hosts for bidirectional remote building.
+      # Generate with: ssh-keygen -t ed25519 -f /etc/ssh/builder_key -N ""
+      # Replace the placeholder below with the public key (builder_key.pub).
+      main = "PLACEHOLDER_ADD_BUILDER_PUBKEY_HERE";
+    };
   };
 
   hosts = {

modules/nixos/services/remote-builder.nix

@@ -0,0 +1,74 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.services.remoteBuilder;
+in {
+  options.services.remoteBuilder = {
+    enable = lib.mkEnableOption "remote Nix build machine";
+
+    machines = lib.mkOption {
+      type = lib.types.listOf (lib.types.submodule {
+        options = {
+          hostName = lib.mkOption {
+            type = lib.types.str;
+            description = "Hostname or IP of the remote build machine.";
+          };
+          port = lib.mkOption {
+            type = lib.types.port;
+            default = 22;
+            description = "SSH port.";
+          };
+          sshUser = lib.mkOption {
+            type = lib.types.str;
+            default = "builder";
+            description = "SSH user on the remote build machine.";
+          };
+          sshKey = lib.mkOption {
+            type = lib.types.str;
+            description = "Path to SSH private key for the builder.";
+          };
+          systems = lib.mkOption {
+            type = lib.types.listOf lib.types.str;
+            default = [ "aarch64-linux" ];
+            description = "System types the remote builder can build for.";
+          };
+          maxJobs = lib.mkOption {
+            type = lib.types.int;
+            default = 4;
+            description = "Max parallel jobs on the remote builder.";
+          };
+          supportedFeatures = lib.mkOption {
+            type = lib.types.listOf lib.types.str;
+            default = [ "benchmark" "big-parallel" "nixos-test" ];
+            description = "Features the remote builder supports.";
+          };
+        };
+      });
+      default = [];
+      description = "List of remote Nix build machines.";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    nix.distributedBuilds = true;
+    nix.buildMachines = map (m: {
+      hostName = m.hostName;
+      sshUser = m.sshUser;
+      sshKey = m.sshKey;
+      systems = m.systems;
+      maxJobs = m.maxJobs;
+      supportedFeatures = m.supportedFeatures;
+    }) cfg.machines;
+
+    # SSH config for port + key (nix.buildMachines has no port option)
+    programs.ssh.extraConfig = lib.concatStringsSep "\n" (map (m: ''
+      Host ${m.hostName}
+        HostName ${m.hostName}
+        Port ${toString m.port}
+        User ${m.sshUser}
+        IdentityFile ${m.sshKey}
+        StrictHostKeyChecking no
+        UserKnownHostsFile /dev/null
+    '') cfg.machines);
+  };
+}

secrets/ai.age

@@ -1,19 +0,0 @@
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-xIsKHYn8gN0lPVtyTSBTomK6kxoKJXxia50x/XAhJwI9X3ydLg==
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secrets/cloudstorage.age

@@ -1,10 +0,0 @@
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-L5CBbzaSXzNwRce0WPVi0mQp56lL12mRlXXamOx/E9Q+r2rznFYdQA==
------END AGE ENCRYPTED FILE-----

secrets/containers.env.age

@@ -1,42 +1,36 @@
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 -----END AGE ENCRYPTED FILE-----

secrets/homeautomation.age

@@ -1,19 +0,0 @@
------BEGIN AGE ENCRYPTED FILE-----
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-r7o=
------END AGE ENCRYPTED FILE-----

secrets/network.age

@@ -1,12 +0,0 @@
------BEGIN AGE ENCRYPTED FILE-----
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------END AGE ENCRYPTED FILE-----

secrets/secrets.nix

@@ -11,8 +11,4 @@ in
   "lazyworkhorse_host_ssh_key.age".publicKeys = authorizedKeys;
   "n8n_ssh_key.age".publicKeys = authorizedKeys;
   "openclaw_gateway_token.age".publicKeys = authorizedKeys;
-  "ai.age".publicKeys = authorizedKeys;
-  "cloudstorege.age".publicKeys = authorizedKeys;
-  "homeautomation.age".age".publicKeys = authorizedKeys;
-  "network.age".age".publicKeys = authorizedKeys;
 }

secrets/tak.age

@@ -1,12 +0,0 @@
------BEGIN AGE ENCRYPTED FILE-----
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------END AGE ENCRYPTED FILE-----

users/builder.nix

@@ -0,0 +1,13 @@
+{ config, lib, pkgs, keys, ... }: {
+  users.users.builder = {
+    isSystemUser = true;
+    group = "builder";
+    home = "/var/empty";
+    createHome = false;
+    shell = pkgs.nologin;
+    openssh.authorizedKeys.keys = with keys; [
+      users.builder.main
+    ];
+  };
+  users.groups.builder = {};
+}