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Unit-test flag stripping without Docker, and assert the image shim rejects the rc.init '-g: not found' restart loop from #66679.
107 lines
3.3 KiB
Python
107 lines
3.3 KiB
Python
"""Unit tests for docker/tini-shim.sh argument stripping (#66679).
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These run without Docker: the shim's HERMES_TINI_SHIM_TARGET /
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HERMES_TINI_SHIM_WRAPPER hooks let us record the argv that would be
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handed to /init.
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"""
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from __future__ import annotations
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import os
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import subprocess
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from pathlib import Path
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import pytest
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REPO_ROOT = Path(__file__).resolve().parents[1]
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SHIM = REPO_ROOT / "docker" / "tini-shim.sh"
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@pytest.fixture
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def recorder(tmp_path: Path) -> tuple[Path, Path]:
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"""Fake /init + wrapper that print argv, one token per line."""
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init = tmp_path / "fake-init"
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wrapper = tmp_path / "fake-wrapper"
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init.write_text("#!/bin/sh\nprintf '%s\\n' \"$@\"\n")
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wrapper.write_text("#!/bin/sh\nprintf 'wrapper\\n'\n")
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init.chmod(0o755)
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wrapper.chmod(0o755)
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return init, wrapper
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def _run_shim(
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recorder: tuple[Path, Path],
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args: list[str],
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) -> subprocess.CompletedProcess[str]:
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init, wrapper = recorder
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env = os.environ.copy()
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env["HERMES_TINI_SHIM_TARGET"] = str(init)
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env["HERMES_TINI_SHIM_WRAPPER"] = str(wrapper)
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return subprocess.run(
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["sh", str(SHIM), *args],
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capture_output=True,
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text=True,
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timeout=10,
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env=env,
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check=False,
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)
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def test_shim_script_is_executable_bit_friendly() -> None:
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assert SHIM.is_file()
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text = SHIM.read_text()
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assert text.startswith("#!/bin/sh")
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assert "HERMES_TINI_SHIM_TARGET" in text
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def test_strips_g_and_double_dash(recorder: tuple[Path, Path]) -> None:
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"""Legacy `tini -g -- gateway run` must not forward `-g` to /init."""
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r = _run_shim(recorder, ["-g", "--", "gateway", "run"])
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assert r.returncode == 0, r.stderr
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lines = [ln for ln in r.stdout.splitlines() if ln]
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init, wrapper = recorder
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assert lines[0] == str(wrapper)
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assert lines[1:] == ["gateway", "run"]
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assert "-g" not in lines
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assert "--" not in lines
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def test_strips_g_without_double_dash(recorder: tuple[Path, Path]) -> None:
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r = _run_shim(recorder, ["-g", "gateway", "run"])
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assert r.returncode == 0, r.stderr
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lines = [ln for ln in r.stdout.splitlines() if ln]
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init, wrapper = recorder
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assert lines == [str(wrapper), "gateway", "run"]
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def test_empty_args_after_flags_uses_wrapper_only(
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recorder: tuple[Path, Path],
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) -> None:
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"""entrypoint `tini -g --` with empty CMD → /init main-wrapper."""
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r = _run_shim(recorder, ["-g", "--"])
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assert r.returncode == 0, r.stderr
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lines = [ln for ln in r.stdout.splitlines() if ln]
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_, wrapper = recorder
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assert lines == [str(wrapper)]
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def test_does_not_double_wrap_existing_wrapper(
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recorder: tuple[Path, Path],
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) -> None:
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_, wrapper = recorder
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r = _run_shim(recorder, ["-g", "--", str(wrapper), "gateway", "run"])
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assert r.returncode == 0, r.stderr
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lines = [ln for ln in r.stdout.splitlines() if ln]
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assert lines == [str(wrapper), "gateway", "run"]
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def test_strips_p_and_e_with_arguments(recorder: tuple[Path, Path]) -> None:
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r = _run_shim(
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recorder,
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["-p", "SIGKILL", "-e", "143", "-v", "-v", "--", "sleep", "infinity"],
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)
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assert r.returncode == 0, r.stderr
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lines = [ln for ln in r.stdout.splitlines() if ln]
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_, wrapper = recorder
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assert lines == [str(wrapper), "sleep", "infinity"]
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assert "SIGKILL" not in lines
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assert "143" not in lines
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