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https://github.com/NousResearch/hermes-agent.git
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611b89c2a7
When container.enable = true in the NixOS module, running 'hermes chat' on the host now automatically execs into the managed container via docker/podman exec. This means the interactive CLI runs in the same environment as the gateway service, with access to all container-installed packages and tools. Implementation: - NixOS activation script writes .container-mode metadata file to HERMES_HOME with backend, container_name, and hermes_bin path - File is removed when container mode is disabled (nixos-rebuild switch) - hermes_cli/config.py: _is_inside_container() detects Docker/Podman indicators (/.dockerenv, /run/.containerenv, cgroup) - hermes_cli/config.py: get_container_exec_info() reads .container-mode metadata, returns None when already inside a container - hermes_cli/main.py: _exec_in_container() validates the container is running, then os.execvp() replaces the process with the container exec - cmd_chat intercepts before normal flow, checks container info, execs Safety: - --host flag bypasses container routing (run on host regardless) - Falls back to host CLI if: container runtime not found, container not running, inspect fails, or any detection error - Strips --host from forwarded args (not meaningful inside container) - Already-inside-container detection prevents infinite exec loops Closes #7380
276 lines
9.2 KiB
Python
276 lines
9.2 KiB
Python
"""Tests for container-aware CLI routing (NixOS container mode).
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When container.enable = true in the NixOS module, the activation script
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writes a .container-mode metadata file. The host CLI detects this and
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execs into the container instead of running locally.
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"""
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import os
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from pathlib import Path
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from types import SimpleNamespace
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from unittest.mock import MagicMock, patch
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import pytest
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from hermes_cli.config import (
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_is_inside_container,
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get_container_exec_info,
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)
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# =============================================================================
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# _is_inside_container
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# =============================================================================
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def test_is_inside_container_dockerenv(tmp_path):
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"""Detects /.dockerenv marker file."""
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with patch("os.path.exists") as mock_exists:
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mock_exists.side_effect = lambda p: p == "/.dockerenv"
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assert _is_inside_container() is True
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def test_is_inside_container_containerenv(tmp_path):
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"""Detects Podman's /run/.containerenv marker."""
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with patch("os.path.exists") as mock_exists:
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mock_exists.side_effect = lambda p: p == "/run/.containerenv"
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assert _is_inside_container() is True
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def test_is_inside_container_cgroup_docker():
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"""Detects 'docker' in /proc/1/cgroup."""
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with patch("os.path.exists", return_value=False), \
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patch("builtins.open", create=True) as mock_open:
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mock_open.return_value.__enter__ = lambda s: s
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mock_open.return_value.__exit__ = MagicMock(return_value=False)
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mock_open.return_value.read = MagicMock(
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return_value="12:memory:/docker/abc123\n"
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)
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assert _is_inside_container() is True
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def test_is_inside_container_false_on_host():
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"""Returns False when none of the container indicators are present."""
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with patch("os.path.exists", return_value=False), \
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patch("builtins.open", side_effect=OSError("no such file")):
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assert _is_inside_container() is False
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# =============================================================================
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# get_container_exec_info
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# =============================================================================
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@pytest.fixture
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def container_env(tmp_path, monkeypatch):
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"""Set up a fake HERMES_HOME with .container-mode file."""
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hermes_home = tmp_path / ".hermes"
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hermes_home.mkdir()
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monkeypatch.setenv("HERMES_HOME", str(hermes_home))
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container_mode = hermes_home / ".container-mode"
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container_mode.write_text(
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"# Written by NixOS activation script. Do not edit manually.\n"
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"backend=podman\n"
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"container_name=hermes-agent\n"
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"hermes_bin=/data/current-package/bin/hermes\n"
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)
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return hermes_home
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def test_get_container_exec_info_returns_metadata(container_env):
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"""Reads .container-mode and returns backend/name/bin."""
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with patch("hermes_cli.config._is_inside_container", return_value=False):
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info = get_container_exec_info()
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assert info is not None
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assert info["backend"] == "podman"
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assert info["container_name"] == "hermes-agent"
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assert info["hermes_bin"] == "/data/current-package/bin/hermes"
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def test_get_container_exec_info_none_inside_container(container_env):
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"""Returns None when we're already inside a container."""
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with patch("hermes_cli.config._is_inside_container", return_value=True):
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info = get_container_exec_info()
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assert info is None
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def test_get_container_exec_info_none_without_file(tmp_path, monkeypatch):
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"""Returns None when .container-mode doesn't exist (native mode)."""
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hermes_home = tmp_path / ".hermes"
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hermes_home.mkdir()
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monkeypatch.setenv("HERMES_HOME", str(hermes_home))
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with patch("hermes_cli.config._is_inside_container", return_value=False):
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info = get_container_exec_info()
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assert info is None
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def test_get_container_exec_info_defaults():
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"""Falls back to defaults for missing keys."""
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import tempfile
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with tempfile.TemporaryDirectory() as tmpdir:
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hermes_home = Path(tmpdir) / ".hermes"
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hermes_home.mkdir()
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(hermes_home / ".container-mode").write_text(
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"# minimal file with no keys\n"
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)
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with patch("hermes_cli.config._is_inside_container", return_value=False), \
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patch("hermes_cli.config.get_hermes_home", return_value=hermes_home):
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info = get_container_exec_info()
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assert info is not None
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assert info["backend"] == "docker"
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assert info["container_name"] == "hermes-agent"
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assert info["hermes_bin"] == "/data/current-package/bin/hermes"
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def test_get_container_exec_info_docker_backend(container_env):
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"""Correctly reads docker backend."""
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(container_env / ".container-mode").write_text(
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"backend=docker\n"
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"container_name=hermes-custom\n"
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"hermes_bin=/opt/hermes/bin/hermes\n"
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)
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with patch("hermes_cli.config._is_inside_container", return_value=False):
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info = get_container_exec_info()
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assert info["backend"] == "docker"
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assert info["container_name"] == "hermes-custom"
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assert info["hermes_bin"] == "/opt/hermes/bin/hermes"
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# =============================================================================
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# _exec_in_container
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# =============================================================================
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def test_exec_in_container_calls_execvp():
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"""Verifies os.execvp is called with the correct command."""
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from hermes_cli.main import _exec_in_container
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container_info = {
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"backend": "podman",
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"container_name": "hermes-agent",
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"hermes_bin": "/data/current-package/bin/hermes",
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}
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with patch("shutil.which", return_value="/usr/bin/podman"), \
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patch("subprocess.run") as mock_run, \
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patch("os.execvp") as mock_exec:
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# Simulate running container
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mock_result = MagicMock()
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mock_result.returncode = 0
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mock_result.stdout = "true\n"
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mock_run.return_value = mock_result
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_exec_in_container(container_info, ["chat", "-m", "claude-sonnet-4"])
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mock_exec.assert_called_once_with(
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"/usr/bin/podman",
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["/usr/bin/podman", "exec", "-it", "hermes-agent",
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"/data/current-package/bin/hermes", "chat", "-m", "claude-sonnet-4"]
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)
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def test_exec_in_container_strips_host_flag():
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"""The --host flag is not forwarded into the container."""
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from hermes_cli.main import _exec_in_container
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container_info = {
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"backend": "podman",
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"container_name": "hermes-agent",
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"hermes_bin": "/data/current-package/bin/hermes",
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}
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with patch("shutil.which", return_value="/usr/bin/podman"), \
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patch("subprocess.run") as mock_run, \
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patch("os.execvp") as mock_exec:
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mock_result = MagicMock()
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mock_result.returncode = 0
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mock_result.stdout = "true\n"
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mock_run.return_value = mock_result
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_exec_in_container(container_info, ["chat", "--host", "-q", "hello"])
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# --host should be stripped
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exec_args = mock_exec.call_args[0][1]
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assert "--host" not in exec_args
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assert "-q" in exec_args
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assert "hello" in exec_args
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def test_exec_in_container_fallback_no_runtime(capsys):
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"""Falls back gracefully when container runtime is not found."""
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from hermes_cli.main import _exec_in_container
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container_info = {
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"backend": "podman",
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"container_name": "hermes-agent",
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"hermes_bin": "/data/current-package/bin/hermes",
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}
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with patch("shutil.which", return_value=None), \
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patch("os.execvp") as mock_exec:
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_exec_in_container(container_info, ["chat"])
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# Should NOT call execvp — graceful fallback
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mock_exec.assert_not_called()
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captured = capsys.readouterr()
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assert "not found on PATH" in captured.err
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def test_exec_in_container_fallback_container_not_running(capsys):
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"""Falls back when container exists but is not running."""
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from hermes_cli.main import _exec_in_container
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container_info = {
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"backend": "docker",
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"container_name": "hermes-agent",
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"hermes_bin": "/data/current-package/bin/hermes",
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}
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with patch("shutil.which", return_value="/usr/bin/docker"), \
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patch("subprocess.run") as mock_run, \
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patch("os.execvp") as mock_exec:
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mock_result = MagicMock()
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mock_result.returncode = 0
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mock_result.stdout = "false\n"
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mock_run.return_value = mock_result
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_exec_in_container(container_info, ["chat"])
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mock_exec.assert_not_called()
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captured = capsys.readouterr()
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assert "not running" in captured.err
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def test_exec_in_container_fallback_inspect_fails():
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"""Falls back when docker inspect fails entirely."""
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from hermes_cli.main import _exec_in_container
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container_info = {
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"backend": "docker",
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"container_name": "hermes-agent",
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"hermes_bin": "/data/current-package/bin/hermes",
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}
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with patch("shutil.which", return_value="/usr/bin/docker"), \
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patch("subprocess.run") as mock_run, \
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patch("os.execvp") as mock_exec:
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mock_result = MagicMock()
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mock_result.returncode = 1
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mock_result.stdout = ""
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mock_run.return_value = mock_result
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_exec_in_container(container_info, ["chat"])
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mock_exec.assert_not_called()
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