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82 lines
2.0 KiB
Python
82 lines
2.0 KiB
Python
#!/usr/bin/env python3
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import os
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import signal
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import subprocess
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from typing import IO, Any, Dict, Iterator, List, Union
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from pathlib import Path
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import pytest
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_DIR = Union[None, Path, str]
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_FILE = Union[None, int, IO[Any]]
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def run(
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cmd: List[str],
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text: bool = True,
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check: bool = True,
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cwd: _DIR = None,
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stderr: _FILE = None,
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stdout: _FILE = None,
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) -> subprocess.CompletedProcess:
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if cwd is not None:
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print(f"cd {cwd}")
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print("$ " + " ".join(cmd))
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return subprocess.run(
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cmd, text=text, check=check, cwd=cwd, stderr=stderr, stdout=stdout
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)
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class Command:
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def __init__(self) -> None:
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self.processes: List[subprocess.Popen] = []
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def run(
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self,
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command: List[str],
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extra_env: Dict[str, str] = {},
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stdin: _FILE = None,
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stdout: _FILE = None,
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stderr: _FILE = None,
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text: bool = True,
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) -> subprocess.Popen:
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env = os.environ.copy()
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env.update(extra_env)
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# We start a new session here so that we can than more reliably kill all childs as well
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p = subprocess.Popen(
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command,
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env=env,
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start_new_session=True,
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stdout=stdout,
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stderr=stderr,
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stdin=stdin,
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text=text,
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)
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self.processes.append(p)
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return p
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def terminate(self) -> None:
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# Stop in reverse order in case there are dependencies.
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# We just kill all processes as quickly as possible because we don't
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# care about corrupted state and want to make tests fasts.
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for p in reversed(self.processes):
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try:
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os.killpg(os.getpgid(p.pid), signal.SIGKILL)
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except OSError:
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pass
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@pytest.fixture
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def command() -> Iterator[Command]:
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"""
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Starts a background command. The process is automatically terminated in the end.
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>>> p = command.run(["some", "daemon"])
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>>> print(p.pid)
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"""
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c = Command()
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try:
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yield c
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finally:
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c.terminate()
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