build: migrate to uv + poethepoet, replace bats with pytest

Complete overhaul of build system and test framework:

Build System:
- Replace Task CLI with uv + poethepoet
- Remove Taskfile.yml, add pyproject.toml with poe tasks:
  uv run poe env:configure  # setup
  uv run poe test           # run tests
  uv run poe package        # create tarball
- Require Python 3.13+ instead of 3.11
- Pin pre-commit 4.5, poethepoet 0.42, pytest 8.0

Test Framework:
- Replace 8 bats test files (lib.bash + 7 *.bats) with 7 pytest modules
- Total: 23 tests (boot, preboot, envs, perms, init, finalize, services)
- Create tests/conftest.py with podman image build/run helpers
- Image building delegated to pytest module-scoped fixtures
- Organize fixture Dockerfiles and rootfs into tests/fixtures/

Code Quality:
- Type annotations throughout (tuple[str, ...] for BASE_DOCKER_ARGS)
- Immutable structures (tuple instead of list)
- Pytest assertions instead of bats exit code checks

CI/CD:
- Update .github/workflows/ci.yml to use astral-sh/setup-uv@v8
- Remove bats system dependency from CI (now pytest + podman only)
- Update .gitignore: add .venv/, __pycache__/, *.pyc
- Update README.md with new command documentation

All 23 tests passing. Fixture data (Dockerfiles, rootfs overlays) now
properly separated from test code in tests/fixtures/ structure.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Author: amannocci

.github/workflows/ci.yml

@@ -14,13 +14,10 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
-      - name: Install Task
-        uses: arduino/setup-task@v2
-
-      - name: Install dependencies
-        run: sudo apt install -y bats
+      - name: Install uv
+        uses: astral-sh/setup-uv@v8
 
       - name: Run tests
-        run: task test
+        run: uv run poe test

.gitignore

@@ -1 +1,5 @@
-dist/
+dist/
+.venv/
+__pycache__/
+*.pyc
+.idea

README.md

@@ -25,7 +25,7 @@
 
 ## :package: Prerequisites
 
-- [Taskfile](https://taskfile.dev/) for development.
+- [uv](https://docs.astral.sh/uv/getting-started/installation/) for development.
 - [Podman](https://podman.io/docs/installation) for development.
 
 ## :sparkles: Features
@@ -49,14 +49,14 @@
 The following steps will ensure your project is cloned properly.
 
 1. `git clone https://github.com/techcode-io/ignity`
-2. `cd ignity && task setup`
+2. `cd ignity && uv run poe env:configure`
 
 ### Test
 
 - To test you have to use the workflow script.
 
 ```bash
-task test
+uv run poe test
 ```
 
 - It will test project code with the current environment.
@@ -66,7 +66,7 @@ task test
 - To package you have to use the workflow script.
 
 ```bash
-task package
+uv run poe package
 ```
 
 - It will create a tar archive containing ignity.

Taskfile.yml

@@ -0,0 +1,32 @@
+[project]
+name = "ignity"
+version = "0.1.0"
+description = "Dead simple process supervision for containers based on s6"
+readme = "README.md"
+requires-python = ">=3.13"
+dependencies = []
+
+[dependency-groups]
+dev = [
+    "pre-commit>=4.5",
+    "poethepoet>=0.42",
+    "pytest>=8.0",
+]
+
+[tool.uv]
+package = false
+
+[tool.poe.tasks."env:configure"]
+help = "Setup project environment"
+cmd = "pre-commit install"
+
+[tool.poe.tasks."test"]
+help = "Run all tests."
+cmd = "pytest tests"
+
+[tool.poe.tasks.package]
+help = "Package source into dist/ignity.tar.gz"
+sequence = [
+    { shell = "rm -rf dist && mkdir -p dist" },
+    { cmd = "tar zcvf dist/ignity.tar.gz -C src/ ." },
+]

pyproject.toml

@@ -0,0 +1,62 @@
+"""Shared helpers for ignity pytest tests."""
+
+import os
+import secrets
+import subprocess
+import tempfile
+from pathlib import Path
+from typing import Final
+
+ROOT: Final[Path] = Path(__file__).parent.parent.resolve()
+
+BASE_DOCKER_ARGS: tuple[str, ...] = (
+    "-e", "IGNITY_KILL_GRACETIME=0",
+    "-e", "IGNITY_KILL_FINALIZE_MAXTIME=0",
+    "-e", "IGNITY_SERVICES_GRACETIME=0",
+    "-e", "IGNITY_CMD_WAIT_FOR_SERVICES_MAXTIME=0",
+)
+
+
+def build_image(kind: str) -> str:
+    """Build a container image for a test suite kind."""
+    tag = secrets.token_hex(16)
+    image_name = f"ignity-test-{kind}-{tag}"
+    dockerfile_tpl = ROOT / "tests" / "fixtures" / kind / "Dockerfile.tpl"
+    base_image = os.environ.get("DOCKER_BASE_IMAGE", "debian:bookworm-slim")
+    rendered = dockerfile_tpl.read_text().replace(
+        "{{DOCKER_BASE_IMAGE}}", base_image
+    )
+    with tempfile.NamedTemporaryFile(
+        mode="w", delete=False, suffix=".Dockerfile"
+    ) as f:
+        f.write(rendered)
+        tmp_path = f.name
+    try:
+        subprocess.run(
+            ["podman", "build", "-t", image_name, "-f", tmp_path, str(ROOT)],
+            check=True,
+        )
+    finally:
+        Path(tmp_path).unlink(missing_ok=True)
+    return image_name
+
+
+def run_in_container(
+    image: str, command: str, extra_args: list[str] | None = None
+) -> subprocess.CompletedProcess:
+    """Run a command in a container and return the result."""
+    args = [
+        "podman",
+        "run",
+        "--name",
+        f"ignity-{secrets.token_hex(8)}",
+        "--entrypoint",
+        "/init",
+        "--rm",
+        "-i",
+        *BASE_DOCKER_ARGS,
+        *(extra_args or []),
+        image,
+        "bash",
+    ]
+    return subprocess.run(args, input=command, capture_output=True, text=True)