feat: nix flake — uv2nix build, NixOS module, persistent container mode

.envrc

@@ -0,0 +1 @@
+use flake

.github/workflows/nix.yml

@@ -0,0 +1,40 @@
+name: Nix
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    paths:
+      - 'flake.nix'
+      - 'flake.lock'
+      - 'nix/**'
+      - 'pyproject.toml'
+      - 'uv.lock'
+      - 'hermes_cli/**'
+      - 'run_agent.py'
+      - 'acp_adapter/**'
+
+concurrency:
+  group: nix-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  nix:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+      - name: Check flake
+        if: runner.os == 'Linux'
+        run: nix flake check --print-build-logs
+      - name: Build package
+        if: runner.os == 'Linux'
+        run: nix build --print-build-logs
+      - name: Evaluate flake (macOS)
+        if: runner.os == 'macOS'
+        run: nix flake show --json > /dev/null

.gitignore

@@ -54,3 +54,7 @@ environments/benchmarks/evals/
 # Release script temp files
 .release_notes.md
 mini-swe-agent/
+
+# Nix
+.direnv/
+result

flake.nix

@@ -0,0 +1,35 @@
+{
+  description = "Hermes Agent - AI agent framework by Nous Research";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
+    flake-parts = {
+      url = "github:hercules-ci/flake-parts";
+      inputs.nixpkgs-lib.follows = "nixpkgs";
+    };
+    pyproject-nix = {
+      url = "github:pyproject-nix/pyproject.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    uv2nix = {
+      url = "github:pyproject-nix/uv2nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    pyproject-build-systems = {
+      url = "github:pyproject-nix/build-system-pkgs";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = inputs:
+    inputs.flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" ];
+
+      imports = [
+        ./nix/packages.nix
+        ./nix/nixosModules.nix
+        ./nix/checks.nix
+        ./nix/devShell.nix
+      ];
+    };
+}

hermes_cli/config.py

@@ -46,6 +46,32 @@
 from hermes_cli.default_soul import DEFAULT_SOUL_MD
 
 
+# =============================================================================
+# Managed mode (NixOS declarative config)
+# =============================================================================
+
+def is_managed() -> bool:
+    """Check if hermes is running in Nix-managed mode.
+
+    Two signals: the HERMES_MANAGED env var (set by the systemd service),
+    or a .managed marker file in HERMES_HOME (set by the NixOS activation
+    script, so interactive shells also see it).
+    """
+    if os.getenv("HERMES_MANAGED", "").lower() in ("true", "1", "yes"):
+        return True
+    managed_marker = Path(os.getenv("HERMES_HOME", str(Path.home() / ".hermes"))) / ".managed"
+    return managed_marker.exists()
+
+def managed_error(action: str = "modify configuration"):
+    """Print user-friendly error for managed mode."""
+    print(
+        f"Cannot {action}: configuration is managed by NixOS (HERMES_MANAGED=true).\n"
+        "Edit services.hermes-agent.settings in your configuration.nix and run:\n"
+        "  sudo nixos-rebuild switch",
+        file=sys.stderr,
+    )
+
+
 # =============================================================================
 # Config paths
 # =============================================================================
@@ -1340,6 +1366,9 @@ def load_config() -> Dict[str, Any]:
 
 def save_config(config: Dict[str, Any]):
     """Save configuration to ~/.hermes/config.yaml."""
+    if is_managed():
+        managed_error("save configuration")
+        return
     from utils import atomic_yaml_write
 
     ensure_hermes_home()
@@ -1481,6 +1510,9 @@ def sanitize_env_file() -> int:
 
 def save_env_value(key: str, value: str):
     """Save or update a value in ~/.hermes/.env."""
+    if is_managed():
+        managed_error(f"set {key}")
+        return
     if not _ENV_VAR_NAME_RE.match(key):
         raise ValueError(f"Invalid environment variable name: {key!r}")
     value = value.replace("\n", "").replace("\r", "")
@@ -1737,6 +1769,9 @@ def show_config():
 
 def edit_config():
     """Open config file in user's editor."""
+    if is_managed():
+        managed_error("edit configuration")
+        return
     config_path = get_config_path()
 
     # Ensure config exists
@@ -1766,6 +1801,9 @@ def edit_config():
 
 def set_config_value(key: str, value: str):
     """Set a configuration value."""
+    if is_managed():
+        managed_error("set configuration values")
+        return
     # Check if it's an API key (goes to .env)
     api_keys = [
         'OPENROUTER_API_KEY', 'OPENAI_API_KEY', 'ANTHROPIC_API_KEY', 'VOICE_TOOLS_OPENAI_KEY',

hermes_cli/gateway.py

@@ -14,7 +14,7 @@
 
 PROJECT_ROOT = Path(__file__).parent.parent.resolve()
 
-from hermes_cli.config import get_env_value, get_hermes_home, save_env_value
+from hermes_cli.config import get_env_value, get_hermes_home, save_env_value, is_managed, managed_error
 from hermes_cli.setup import (
     print_header, print_info, print_success, print_warning, print_error,
     prompt, prompt_choice, prompt_yes_no,
@@ -1562,6 +1562,9 @@ def _setup_signal():
 
 def gateway_setup():
     """Interactive setup for messaging platforms + gateway service."""
+    if is_managed():
+        managed_error("run gateway setup")
+        return
 
     print()
     print(color("┌─────────────────────────────────────────────────────────┐", Colors.MAGENTA))
@@ -1716,6 +1719,9 @@ def gateway_command(args):
 
     # Service management commands
     if subcmd == "install":
+        if is_managed():
+            managed_error("install gateway service (managed by NixOS)")
+            return
         force = getattr(args, 'force', False)
         system = getattr(args, 'system', False)
         run_as_user = getattr(args, 'run_as_user', None)
@@ -1729,6 +1735,9 @@ def gateway_command(args):
             sys.exit(1)
 
     elif subcmd == "uninstall":
+        if is_managed():
+            managed_error("uninstall gateway service (managed by NixOS)")
+            return
         system = getattr(args, 'system', False)
         if is_linux():
             systemd_uninstall(system=system)

hermes_cli/setup.py

@@ -3106,6 +3106,10 @@ def run_setup_wizard(args):
       hermes setup tools     — just tool configuration
       hermes setup agent     — just agent settings
     """
+    from hermes_cli.config import is_managed, managed_error
+    if is_managed():
+        managed_error("run setup wizard")
+        return
     ensure_hermes_home()
 
     config = load_config()