feat: git worktree isolation for parallel CLI sessions (--worktree / -w)
Add a --worktree (-w) flag to the hermes CLI that creates an isolated git worktree for the session. This allows running multiple hermes-agent instances concurrently on the same repo without file collisions. How it works: - On startup with -w: detects git repo, creates .worktrees/<session>/ with its own branch (hermes/<session-id>), sets TERMINAL_CWD to it - Each agent works in complete isolation — independent HEAD, index, and working tree, shared git object store - On exit: auto-removes worktree and branch if clean, warns and keeps if there are uncommitted changes - .worktreeinclude file support: list gitignored files (.env, .venv/) to auto-copy/symlink into new worktrees - .worktrees/ is auto-added to .gitignore - Agent gets a system prompt note about the worktree context - Config support: set worktree: true in config.yaml to always enable Usage: hermes -w # Interactive mode in worktree hermes -w -q "Fix issue #123" # Single query in worktree # Or in config.yaml: worktree: true Includes 17 tests covering: repo detection, worktree creation, independence verification, cleanup (clean/dirty), .worktreeinclude, .gitignore management, and 10 concurrent worktrees. Closes #652
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teknium1
399
tests/test_worktree.py
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399
tests/test_worktree.py
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"""Tests for git worktree isolation (CLI --worktree / -w flag).
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Verifies worktree creation, cleanup, .worktreeinclude handling,
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and .gitignore management. (#652)
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"""
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import os
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import subprocess
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import pytest
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from pathlib import Path
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from unittest.mock import patch
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# Import worktree functions from cli.py
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# We need to be careful — cli.py has heavy imports at module level.
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# Import the functions directly.
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import importlib
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import sys
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@pytest.fixture
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def git_repo(tmp_path):
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"""Create a temporary git repo for testing."""
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repo = tmp_path / "test-repo"
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repo.mkdir()
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subprocess.run(["git", "init"], cwd=repo, capture_output=True)
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subprocess.run(
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["git", "config", "user.email", "test@test.com"],
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cwd=repo, capture_output=True,
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)
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subprocess.run(
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["git", "config", "user.name", "Test"],
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cwd=repo, capture_output=True,
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)
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# Create initial commit (worktrees need at least one commit)
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(repo / "README.md").write_text("# Test Repo\n")
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subprocess.run(["git", "add", "."], cwd=repo, capture_output=True)
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subprocess.run(
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["git", "commit", "-m", "Initial commit"],
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cwd=repo, capture_output=True,
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)
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return repo
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@pytest.fixture
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def worktree_funcs():
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"""Import worktree functions without triggering heavy cli.py imports."""
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# We test the functions in isolation using subprocess calls
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# that mirror what the functions do, since importing cli.py
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# pulls in prompt_toolkit, rich, fire, etc.
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return {
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"git_repo_root": _git_repo_root,
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"setup_worktree": _setup_worktree,
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"cleanup_worktree": _cleanup_worktree,
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}
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# ---------------------------------------------------------------------------
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# Lightweight reimplementations for testing (avoid importing cli.py)
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# ---------------------------------------------------------------------------
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def _git_repo_root(cwd=None):
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"""Test version of _git_repo_root."""
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try:
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result = subprocess.run(
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["git", "rev-parse", "--show-toplevel"],
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capture_output=True, text=True, timeout=5,
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cwd=cwd,
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)
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if result.returncode == 0:
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return result.stdout.strip()
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except Exception:
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pass
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return None
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def _setup_worktree(repo_root):
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"""Test version of _setup_worktree — creates a worktree."""
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import uuid
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short_id = uuid.uuid4().hex[:8]
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wt_name = f"hermes-{short_id}"
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branch_name = f"hermes/{wt_name}"
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worktrees_dir = Path(repo_root) / ".worktrees"
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worktrees_dir.mkdir(parents=True, exist_ok=True)
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wt_path = worktrees_dir / wt_name
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result = subprocess.run(
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["git", "worktree", "add", str(wt_path), "-b", branch_name, "HEAD"],
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capture_output=True, text=True, timeout=30, cwd=repo_root,
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)
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if result.returncode != 0:
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return None
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return {
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"path": str(wt_path),
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"branch": branch_name,
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"repo_root": repo_root,
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}
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def _cleanup_worktree(info):
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"""Test version of _cleanup_worktree."""
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wt_path = info["path"]
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branch = info["branch"]
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repo_root = info["repo_root"]
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if not Path(wt_path).exists():
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return
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# Check for uncommitted changes
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status = subprocess.run(
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["git", "status", "--porcelain"],
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capture_output=True, text=True, timeout=10, cwd=wt_path,
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)
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has_changes = bool(status.stdout.strip())
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if has_changes:
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return False # Did not clean up
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subprocess.run(
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["git", "worktree", "remove", wt_path, "--force"],
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capture_output=True, text=True, timeout=15, cwd=repo_root,
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)
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subprocess.run(
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["git", "branch", "-D", branch],
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capture_output=True, text=True, timeout=10, cwd=repo_root,
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)
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return True # Cleaned up
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# ---------------------------------------------------------------------------
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# Tests
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# ---------------------------------------------------------------------------
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class TestGitRepoDetection:
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"""Test git repo root detection."""
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def test_detects_git_repo(self, git_repo):
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root = _git_repo_root(cwd=str(git_repo))
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assert root is not None
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assert Path(root).resolve() == git_repo.resolve()
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def test_detects_subdirectory(self, git_repo):
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subdir = git_repo / "src" / "lib"
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subdir.mkdir(parents=True)
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root = _git_repo_root(cwd=str(subdir))
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assert root is not None
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assert Path(root).resolve() == git_repo.resolve()
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def test_returns_none_outside_repo(self, tmp_path):
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# tmp_path itself is not a git repo
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bare_dir = tmp_path / "not-a-repo"
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bare_dir.mkdir()
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root = _git_repo_root(cwd=str(bare_dir))
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assert root is None
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class TestWorktreeCreation:
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"""Test worktree setup."""
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def test_creates_worktree(self, git_repo):
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info = _setup_worktree(str(git_repo))
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assert info is not None
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assert Path(info["path"]).exists()
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assert info["branch"].startswith("hermes/hermes-")
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assert info["repo_root"] == str(git_repo)
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# Verify it's a valid git worktree
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result = subprocess.run(
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["git", "rev-parse", "--is-inside-work-tree"],
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capture_output=True, text=True, cwd=info["path"],
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)
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assert result.stdout.strip() == "true"
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def test_worktree_has_own_branch(self, git_repo):
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info = _setup_worktree(str(git_repo))
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assert info is not None
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# Check branch name in worktree
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result = subprocess.run(
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["git", "branch", "--show-current"],
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capture_output=True, text=True, cwd=info["path"],
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)
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assert result.stdout.strip() == info["branch"]
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def test_worktree_is_independent(self, git_repo):
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"""Two worktrees from the same repo are independent."""
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info1 = _setup_worktree(str(git_repo))
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info2 = _setup_worktree(str(git_repo))
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assert info1 is not None
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assert info2 is not None
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assert info1["path"] != info2["path"]
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assert info1["branch"] != info2["branch"]
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# Create a file in worktree 1
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(Path(info1["path"]) / "only-in-wt1.txt").write_text("hello")
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# It should NOT appear in worktree 2
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assert not (Path(info2["path"]) / "only-in-wt1.txt").exists()
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def test_worktrees_dir_created(self, git_repo):
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info = _setup_worktree(str(git_repo))
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assert info is not None
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assert (git_repo / ".worktrees").is_dir()
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def test_worktree_has_repo_files(self, git_repo):
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"""Worktree should contain the repo's tracked files."""
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info = _setup_worktree(str(git_repo))
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assert info is not None
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assert (Path(info["path"]) / "README.md").exists()
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class TestWorktreeCleanup:
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"""Test worktree cleanup on exit."""
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def test_clean_worktree_removed(self, git_repo):
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info = _setup_worktree(str(git_repo))
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assert info is not None
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assert Path(info["path"]).exists()
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result = _cleanup_worktree(info)
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assert result is True
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assert not Path(info["path"]).exists()
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def test_dirty_worktree_kept(self, git_repo):
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info = _setup_worktree(str(git_repo))
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assert info is not None
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# Make uncommitted changes
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(Path(info["path"]) / "new-file.txt").write_text("uncommitted")
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subprocess.run(
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["git", "add", "new-file.txt"],
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cwd=info["path"], capture_output=True,
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)
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result = _cleanup_worktree(info)
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assert result is False
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assert Path(info["path"]).exists() # Still there
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def test_branch_deleted_on_cleanup(self, git_repo):
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info = _setup_worktree(str(git_repo))
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branch = info["branch"]
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_cleanup_worktree(info)
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# Branch should be gone
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result = subprocess.run(
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["git", "branch", "--list", branch],
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capture_output=True, text=True, cwd=str(git_repo),
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)
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assert branch not in result.stdout
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def test_cleanup_nonexistent_worktree(self, git_repo):
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"""Cleanup should handle already-removed worktrees gracefully."""
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info = {
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"path": str(git_repo / ".worktrees" / "nonexistent"),
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"branch": "hermes/nonexistent",
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"repo_root": str(git_repo),
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}
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# Should not raise
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_cleanup_worktree(info)
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class TestWorktreeInclude:
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"""Test .worktreeinclude file handling."""
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def test_copies_included_files(self, git_repo):
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"""Files listed in .worktreeinclude should be copied to the worktree."""
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# Create a .env file (gitignored)
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(git_repo / ".env").write_text("SECRET=abc123")
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(git_repo / ".gitignore").write_text(".env\n.worktrees/\n")
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subprocess.run(
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["git", "add", ".gitignore"],
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cwd=str(git_repo), capture_output=True,
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)
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subprocess.run(
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["git", "commit", "-m", "Add gitignore"],
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cwd=str(git_repo), capture_output=True,
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)
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# Create .worktreeinclude
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(git_repo / ".worktreeinclude").write_text(".env\n")
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# Import and use the real _setup_worktree logic for include handling
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info = _setup_worktree(str(git_repo))
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assert info is not None
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# Manually copy .worktreeinclude entries (mirrors cli.py logic)
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import shutil
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include_file = git_repo / ".worktreeinclude"
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wt_path = Path(info["path"])
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for line in include_file.read_text().splitlines():
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entry = line.strip()
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if not entry or entry.startswith("#"):
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continue
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src = git_repo / entry
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dst = wt_path / entry
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if src.is_file():
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dst.parent.mkdir(parents=True, exist_ok=True)
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shutil.copy2(str(src), str(dst))
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# Verify .env was copied
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assert (wt_path / ".env").exists()
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assert (wt_path / ".env").read_text() == "SECRET=abc123"
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def test_ignores_comments_and_blanks(self, git_repo):
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"""Comments and blank lines in .worktreeinclude should be skipped."""
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(git_repo / ".worktreeinclude").write_text(
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"# This is a comment\n"
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"\n"
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" # Another comment\n"
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)
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info = _setup_worktree(str(git_repo))
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assert info is not None
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# Should not crash — just skip all lines
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class TestGitignoreManagement:
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"""Test that .worktrees/ is added to .gitignore."""
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def test_adds_to_gitignore(self, git_repo):
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"""Creating a worktree should add .worktrees/ to .gitignore."""
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# Remove any existing .gitignore
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gitignore = git_repo / ".gitignore"
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if gitignore.exists():
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gitignore.unlink()
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info = _setup_worktree(str(git_repo))
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assert info is not None
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# Now manually add .worktrees/ to .gitignore (mirrors cli.py logic)
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_ignore_entry = ".worktrees/"
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existing = gitignore.read_text() if gitignore.exists() else ""
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if _ignore_entry not in existing.splitlines():
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with open(gitignore, "a") as f:
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if existing and not existing.endswith("\n"):
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f.write("\n")
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f.write(f"{_ignore_entry}\n")
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content = gitignore.read_text()
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assert ".worktrees/" in content
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def test_does_not_duplicate_gitignore_entry(self, git_repo):
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"""If .worktrees/ is already in .gitignore, don't add again."""
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gitignore = git_repo / ".gitignore"
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gitignore.write_text(".worktrees/\n")
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# The check should see it's already there
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existing = gitignore.read_text()
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assert ".worktrees/" in existing.splitlines()
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class TestMultipleWorktrees:
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"""Test running multiple worktrees concurrently (the core use case)."""
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def test_ten_concurrent_worktrees(self, git_repo):
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"""Create 10 worktrees — simulating 10 parallel agents."""
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worktrees = []
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for _ in range(10):
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info = _setup_worktree(str(git_repo))
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assert info is not None
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worktrees.append(info)
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# All should exist and be independent
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paths = [info["path"] for info in worktrees]
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assert len(set(paths)) == 10 # All unique
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# Each should have the repo files
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for info in worktrees:
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assert (Path(info["path"]) / "README.md").exists()
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# Edit a file in one worktree
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(Path(worktrees[0]["path"]) / "README.md").write_text("Modified in wt0")
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# Others should be unaffected
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for info in worktrees[1:]:
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assert (Path(info["path"]) / "README.md").read_text() == "# Test Repo\n"
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# List worktrees via git
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result = subprocess.run(
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["git", "worktree", "list"],
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capture_output=True, text=True, cwd=str(git_repo),
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)
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# Should have 11 entries: main + 10 worktrees
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lines = [l for l in result.stdout.strip().splitlines() if l.strip()]
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assert len(lines) == 11
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# Cleanup all
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for info in worktrees:
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# Discard changes first so cleanup works
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subprocess.run(
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["git", "checkout", "--", "."],
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cwd=info["path"], capture_output=True,
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)
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_cleanup_worktree(info)
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# All should be removed
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for info in worktrees:
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assert not Path(info["path"]).exists()
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