mirror of
https://github.com/rcourtman/Pulse.git
synced 2026-10-26 13:39:47 +00:00
pulse-triage[bot]
94d46bd075
The complete documentation proof observed a synthetic reader still in state R after the command pipes closed. Keep the 80-second group kill and 83-second test ceiling unchanged, but observe gone or zombie for at most half a second before declaring completion. Persistent live states, observation errors and malformed records still fail; deterministic transition and bound controls cover the witness. Contract-Neutral: Documentation verification witness only; copied collector recipes, runtime behaviour and subsystem contracts are unchanged. Change-source: pulse-maintainer
425 lines
22 KiB
Python
425 lines
22 KiB
Python
#!/usr/bin/env python3
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"""Execute both copied performance recipes with synthetic readers.
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Real awk validates fixtures and real GNU timeout enforces the whole-group deadline. Only
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this test's shell group can be killed by the test cleanup; no Pulse service,
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database, Docker socket, workload or destination is used.
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"""
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from __future__ import annotations
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import errno
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import json
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import os
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from pathlib import Path
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import re
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import shutil
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import signal
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import subprocess
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import tempfile
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import time
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import unittest
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from unittest import mock
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ROOT = Path(__file__).resolve().parents[2]
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DOC = ROOT / "docs/TROUBLESHOOTING.md"
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CONTAINER_ID = "a" * 64
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DOCKER_IDENTITY = f"{CONTAINER_ID} 2026-10-02T20:00:00Z true 0"
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PROCESS_IDENTITY = "4321 Sat Oct 3 00:00:00 2026"
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DEFAULT_IO = ("rchar: 987654\nwchar: 999999\nwrite_bytes: 1000\ncancelled_write_bytes: 20\n",
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"rchar: 999999\nwchar: 999999\nwrite_bytes: 13000\ncancelled_write_bytes: 30\n")
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def section() -> str:
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return DOC.read_text(encoding="utf-8").split(
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"#### Excessive CPU, writes or database growth\n", 1
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)[1].split("\n### Notifications\n", 1)[0]
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def recipes() -> dict[str, str]:
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blocks = re.findall(r"```bash\n(.*?)```", section(), re.DOTALL)
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if len(blocks) != 2:
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raise AssertionError("expected two deployment recipes")
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return {"docker" if "# Docker:" in block else "systemd": block for block in blocks}
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READER = '''#!/usr/bin/env python3
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import json, os, pathlib, signal, subprocess, sys, time
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name = pathlib.Path(sys.argv[0]).name
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args = sys.argv[1:]
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root = pathlib.Path(os.environ['RECIPE_FIXTURE'])
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log = root / 'calls.jsonl'
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previous = [json.loads(line) for line in log.read_text().splitlines()] if log.exists() else []
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count = sum(call['name'] == name for call in previous)
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if name == 'docker':
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count = sum(call['name'] == name and call['args'][0] == args[0] for call in previous)
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with log.open('a') as stream:
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stream.write(json.dumps({'name': name, 'args': args}) + '\\n')
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if os.environ.get('HANG_TOOL') == name:
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if os.environ.get('IGNORE_TERM'):
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signal.signal(signal.SIGTERM, signal.SIG_IGN)
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(root / 'hung-reader.json').write_text(json.dumps({'pid': os.getpid(), 'group': os.getpgrp()}))
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time.sleep(100)
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if name == 'date':
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assert args == ['-u', '+%Y-%m-%dT%H:%M:%SZ']
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print('2026-10-03T00:00:00Z' if count == 0 else '2026-10-03T00:01:00Z')
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elif name == 'sleep':
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assert args == ['60']
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elif name == 'systemctl':
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assert args == ['show', 'pulse', '--property=MainPID', '--value']
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print(os.environ.get(f'PID_{count}', os.environ.get('FIXTURE_PID', '4321')))
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sys.exit(int(os.environ.get('SYSTEMCTL_EXIT', '0')))
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elif name == 'ps':
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assert args == ['-p', '4321', '-o', 'pid=,lstart=']
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assert os.environ['TZ'] == 'UTC'
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print(os.environ.get(f'PROCESS_{count}', '4321 Sat Oct 3 00:00:00 2026'))
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sys.exit(int(os.environ.get('PS_EXIT', '0')))
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elif name == 'awk':
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if args[-1] == '/proc/4321/io':
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index = sum(call['name'] == name and call['args'][-1] == args[-1] for call in previous)
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fixture = root / ('missing' if os.environ.get('IO_MISSING') else f'io-{index}')
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else:
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assert args[-1] == '/proc/4321/stat'
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index = sum(call['name'] == name and call['args'][-1] == args[-1] for call in previous)
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# comm may contain spaces and right parentheses. Starttime is field 22.
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ticks = os.environ.get(f'TICKS_{index}', '10000')
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fixture = root / f'stat-{index}'
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fixture.write_text('4321 (private ) worker) S ' + ' '.join(['0'] * 18 + [ticks]) + '\\n')
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if os.environ.get('AWK_EXIT'):
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print('private permission error', file=sys.stderr)
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sys.exit(int(os.environ['AWK_EXIT']))
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sys.exit(subprocess.run([os.environ['REAL_AWK'], *args[:-1], str(fixture)]).returncode)
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elif name == 'sudo':
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assert args[0] in ('awk', '-n')
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offset = 2 if args[0] == '-n' else 1
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assert args[offset-1] == 'awk' and args[-1] == '/proc/4321/io'
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target = root / ('missing' if os.environ.get('IO_MISSING') else f'io-{count}')
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if os.environ.get('SUDO_EXIT'):
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print('private permission error', file=sys.stderr)
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sys.exit(int(os.environ['SUDO_EXIT']))
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sys.exit(subprocess.run([os.environ['REAL_AWK'], *args[offset:-1], str(target)]).returncode)
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elif name == 'docker':
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if args[0] == 'inspect':
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identity = os.environ.get(f'INSPECT_{count}', os.environ['DOCKER_IDENTITY'])
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if args[1:] == ['--format', 'Started={{.State.StartedAt}}', 'pulse']:
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print('Started=' + (identity.split()[1] if identity else ''))
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else:
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print(identity)
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elif args[0] == 'stats':
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text = os.environ.get('DOCKER_STATS', 'CPU=12.50% Memory=100MiB / 1GiB BlockIO=1MB / 12MB')
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if text:
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print(text)
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else:
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raise AssertionError('unsupported docker command')
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setting = 'DOCKER_INSPECT_EXIT' if args[0] == 'inspect' else 'DOCKER_STATS_EXIT'
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if os.environ.get(setting):
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print('private daemon error', file=sys.stderr)
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sys.exit(int(os.environ.get(setting, '0')))
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else:
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raise AssertionError('unexpected command')
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'''
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def run_owned(copied: str, env: dict[str, str]):
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with subprocess.Popen(["bash", "-c", copied], env=env, text=True,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE,
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start_new_session=True) as process:
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try:
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stdout, stderr = process.communicate(timeout=83)
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except subprocess.TimeoutExpired:
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# This is an adverse test error, never an empty/passing sample.
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try:
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os.killpg(process.pid, signal.SIGKILL)
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except ProcessLookupError:
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pass
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process.communicate(timeout=5)
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raise
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return subprocess.CompletedProcess(process.args, process.returncode, stdout, stderr)
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def observe_owned_reader_exit(pid: int):
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"""Require termination, with bounded readback inside the existing 83s budget.
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Closing the command's pipes is not a process-termination observation. Do
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not accept a live state; allow at most half a second for readback to show
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that this already-signalled synthetic reader is gone or cannot run.
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"""
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deadline = time.monotonic() + 0.5
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state = Path(f"/proc/{pid}/stat")
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while True:
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try:
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remaining = state.read_text().rsplit(") ", 1)[1].split()[0]
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except (FileNotFoundError, ProcessLookupError):
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return None
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if remaining == "Z":
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return remaining
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left = deadline - time.monotonic()
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if left <= 0:
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return remaining
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time.sleep(min(0.01, left))
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class PerformanceTroubleshootingDocsTest(unittest.TestCase):
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def exercise(self, deployment: str, *, counters: tuple[str, str] = DEFAULT_IO,
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copied: str | None = None, **settings: str):
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with tempfile.TemporaryDirectory() as temporary:
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directory = Path(temporary)
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for name in ("date", "sleep", "systemctl", "ps", "awk", "sudo", "docker"):
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command = directory / name
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command.write_text(READER, encoding="utf-8")
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command.chmod(0o700)
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for index, text in enumerate(counters):
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(directory / f"io-{index}").write_text(text, encoding="utf-8")
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env = dict(os.environ, PATH=f"{directory}:{os.environ['PATH']}",
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RECIPE_FIXTURE=str(directory), REAL_AWK=shutil.which("awk"),
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DOCKER_IDENTITY=DOCKER_IDENTITY, **settings)
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result = run_owned(copied if copied is not None else recipes()[deployment], env)
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hung_reader = directory / "hung-reader.json"
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if hung_reader.exists():
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pid = json.loads(hung_reader.read_text())["pid"]
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remaining = observe_owned_reader_exit(pid)
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self.assertIn(remaining, (None, "Z"), "owned reader survived the collection deadline")
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log = directory / "calls.jsonl"
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calls = [json.loads(line) for line in log.read_text().splitlines()] if log.exists() else []
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return result, calls
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def observe_reader_state(self, observation: str | OSError):
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"""Drive the actual assertion without a real recipe or signalling."""
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original_read_text = Path.read_text
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reader_stat = Path("/proc/4321/stat")
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def synthetic_collection(copied, env):
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directory = Path(env["RECIPE_FIXTURE"])
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(directory / "hung-reader.json").write_text(json.dumps({"pid": 4321}))
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return subprocess.CompletedProcess(["synthetic collection"], 137, "", "unavailable")
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def read_text(path, *args, **kwargs):
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if path == reader_stat:
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if isinstance(observation, OSError):
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raise observation
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return observation
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return original_read_text(path, *args, **kwargs)
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with mock.patch(f"{__name__}.run_owned", side_effect=synthetic_collection), \
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mock.patch.object(Path, "read_text", autospec=True, side_effect=read_text):
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return self.exercise("docker", copied="synthetic command; never executed")
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def test_deadline_readback_accepts_reader_reaped_before_open(self):
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result, _ = self.observe_reader_state(FileNotFoundError(errno.ENOENT, "test-only missing reader"))
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self.assert_unavailable(result)
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def test_deadline_readback_accepts_reader_reaped_during_read(self):
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result, _ = self.observe_reader_state(ProcessLookupError(errno.ESRCH, "test-only reaped reader"))
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self.assert_unavailable(result)
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def test_deadline_readback_accepts_nonrunning_zombie(self):
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result, _ = self.observe_reader_state("4321 (test ) reader) Z 0 0 0")
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self.assert_unavailable(result)
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def test_deadline_readback_requires_observed_exit_not_closed_pipes(self):
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clock = [0.0]
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states = ["4321 (reader) R 0", "4321 (reader) R 0", "4321 (reader) Z 0"]
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with mock.patch.object(Path, "read_text", side_effect=states) as read, \
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mock.patch.object(time, "monotonic", side_effect=lambda: clock[0]), \
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mock.patch.object(time, "sleep", side_effect=lambda delay: clock.__setitem__(0, clock[0] + delay)):
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self.assertEqual(observe_owned_reader_exit(4321), "Z")
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self.assertEqual(read.call_count, 3)
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self.assertEqual(clock[0], 0.02)
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def test_deadline_readback_still_refuses_a_live_reader_after_bounded_wait(self):
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clock = [0.0]
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with mock.patch.object(Path, "read_text", return_value="4321 (reader) R 0"), \
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mock.patch.object(time, "monotonic", side_effect=lambda: clock[0]), \
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mock.patch.object(time, "sleep", side_effect=lambda delay: clock.__setitem__(0, clock[0] + delay)):
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self.assertEqual(observe_owned_reader_exit(4321), "R")
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self.assertAlmostEqual(clock[0], 0.5)
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def test_deadline_readback_keeps_exit_and_observation_errors_distinct(self):
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for error in (FileNotFoundError(errno.ENOENT, "test-only reaped"),
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ProcessLookupError(errno.ESRCH, "test-only reaped during read")):
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with self.subTest(error=type(error).__name__), \
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mock.patch.object(Path, "read_text", side_effect=["4321 (reader) R 0", error]), \
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mock.patch.object(time, "sleep"):
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self.assertIsNone(observe_owned_reader_exit(4321))
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with mock.patch.object(Path, "read_text", side_effect=PermissionError(errno.EACCES, "test-only denied")):
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with self.assertRaises(PermissionError):
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observe_owned_reader_exit(4321)
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def test_deadline_readback_rejects_surviving_readers(self):
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for state in ("R", "S", "D", "T"):
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with self.subTest(state=state), self.assertRaisesRegex(AssertionError, "reader survived"):
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self.observe_reader_state(f"4321 (test ) reader) {state} 0 0 0")
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def test_deadline_readback_does_not_hide_other_observation_errors(self):
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for error in (PermissionError(errno.EACCES, "test-only denied read"),
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OSError(errno.EIO, "test-only failed read")):
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with self.subTest(error=type(error).__name__), self.assertRaises(type(error)):
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self.observe_reader_state(error)
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def test_deadline_readback_does_not_accept_malformed_observations(self):
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for observation in ("", "4321 (reader)", "4321 (reader) "):
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with self.subTest(observation=observation), self.assertRaises(IndexError):
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self.observe_reader_state(observation)
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def assert_unavailable(self, result):
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self.assertNotEqual(result.returncode, 0)
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self.assertEqual(result.stdout, "", "an incomplete pair must not be published")
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self.assertIn("unavailable", result.stderr)
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self.assertNotIn("private", result.stderr)
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def test_shipped_source_and_shell_syntax(self):
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self.assertEqual(DOC.read_bytes(),
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(ROOT / "frontend-modern/public/docs/TROUBLESHOOTING.md").read_bytes())
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for copied in recipes().values():
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result = subprocess.run(["bash", "-n"], input=copied, text=True, capture_output=True)
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self.assertEqual(result.returncode, 0, result.stderr)
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self.assertIn("timeout --signal=KILL 80s bash", copied)
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def test_systemd_samples_only_valid_write_counters_and_stable_identity(self):
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result, calls = self.exercise("systemd")
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self.assertEqual(result.returncode, 0, result.stderr)
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self.assertEqual([c["name"] for c in calls],
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["systemctl", "ps", "awk", "date", "awk", "systemctl", "ps", "awk",
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"sleep", "systemctl", "ps", "awk", "date", "awk", "systemctl", "ps", "awk"])
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self.assertFalse(any(c["name"] == "sudo" for c in calls))
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self.assertEqual([c["args"][-1] for c in calls if c["name"] == "awk"],
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["/proc/4321/stat", "/proc/4321/io", "/proc/4321/stat"] * 2)
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for value in (PROCESS_IDENTITY, "start ticks=10000", "write_bytes: 1000",
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"write_bytes: 13000", "cancelled_write_bytes: 20", "cancelled_write_bytes: 30"):
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self.assertIn(value, result.stdout)
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for forbidden in ("rchar", "wchar", "private ) worker"):
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self.assertNotIn(forbidden, result.stdout)
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def test_invalid_pid_stops_before_process_reads(self):
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for pid in ("", "0", "not-a-pid", "4321 extra"):
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with self.subTest(pid=pid):
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result, calls = self.exercise("systemd", FIXTURE_PID=pid)
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self.assert_unavailable(result)
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self.assertEqual([c["name"] for c in calls], ["systemctl"])
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def test_failed_or_empty_identity_does_not_publish_counters(self):
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for settings in ({"SYSTEMCTL_EXIT": "3"}, {"PS_EXIT": "4"}, {"PROCESS_0": ""},
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{"TICKS_0": ""}, {"TICKS_0": "bad"}, {"IO_MISSING": "1"}, {"AWK_EXIT": "5"}):
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with self.subTest(settings=settings):
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result, calls = self.exercise("systemd", **settings)
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self.assert_unavailable(result)
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self.assertNotIn("sleep", [c["name"] for c in calls])
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def test_partial_malformed_or_duplicate_counters_are_withheld(self):
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for text in ("", "rchar: 999\n", "write_bytes: 1000\n", "write_bytes: nope\ncancelled_write_bytes: 2\n",
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"write_bytes: 1000 bytes\ncancelled_write_bytes: 2\n",
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"write_bytes: 1000\nwrite_bytes: 1001\n",
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"write_bytes: 1000\ncancelled_write_bytes: 2\nwrite_bytes: 1001\n"):
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with self.subTest(text=text):
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result, _ = self.exercise("systemd", counters=(text, text))
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self.assert_unavailable(result)
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def test_pid_start_or_same_second_reuse_during_or_between_reads_is_withheld(self):
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for settings in ({"PID_1": "5432"}, {"PID_2": "5432"},
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{"PROCESS_1": "4321 Sat Oct 3 00:00:01 2026"},
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{"PROCESS_2": "4321 Sat Oct 3 00:00:01 2026"},
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{"TICKS_1": "10001"}, {"TICKS_2": "10001", "TICKS_3": "10001"}):
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with self.subTest(settings=settings):
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result, _ = self.exercise("systemd", **settings)
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self.assert_unavailable(result)
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def test_second_sample_failure_withholds_the_completed_first_sample(self):
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result, _ = self.exercise("systemd", counters=(DEFAULT_IO[0], "write_bytes: 99\n"))
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self.assert_unavailable(result)
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def test_decreasing_counters_remain_raw_not_a_rate(self):
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result, _ = self.exercise("systemd", counters=(DEFAULT_IO[1], DEFAULT_IO[0]))
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self.assertEqual(result.returncode, 0, result.stderr)
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self.assertIn("write_bytes: 13000", result.stdout)
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self.assertIn("write_bytes: 1000", result.stdout)
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self.assertNotRegex(result.stdout, r"GB/day|bytes/s|bytes: -[0-9]+")
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def test_docker_targets_the_full_id_and_checks_its_running_instance(self):
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result, calls = self.exercise("docker")
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self.assertEqual(result.returncode, 0, result.stderr)
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expected = ["inspect", "--type", "container", "--format",
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"{{.Id}} {{.State.StartedAt}} {{.State.Running}} {{.RestartCount}}", "pulse"]
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self.assertEqual([c["args"] for c in calls if c["name"] == "docker" and c["args"][0] == "inspect"],
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[expected] * 4)
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self.assertEqual([c["args"] for c in calls if c["name"] == "docker" and c["args"][0] == "stats"],
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[["stats", "--no-stream", "--format",
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"CPU={{.CPUPerc}} Memory={{.MemUsage}} BlockIO={{.BlockIO}}", CONTAINER_ID]] * 2)
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self.assertEqual(result.stdout.count(DOCKER_IDENTITY), 2)
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self.assertEqual(result.stdout.count("BlockIO=1MB / 12MB"), 2)
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def test_invalid_stopped_or_unstarted_docker_identity_is_unavailable(self):
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for identity in ("", DOCKER_IDENTITY.replace(CONTAINER_ID, "short"),
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DOCKER_IDENTITY.replace("true", "false"),
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DOCKER_IDENTITY.replace("2026-10-02T20:00:00Z", "0001-01-01T00:00:00Z"),
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DOCKER_IDENTITY.replace("2026-10-02T20:00:00Z", "bad"),
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DOCKER_IDENTITY + " extra", DOCKER_IDENTITY + "\n" + DOCKER_IDENTITY):
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with self.subTest(identity=identity):
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result, calls = self.exercise("docker", INSPECT_0=identity)
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self.assert_unavailable(result)
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self.assertFalse(any(c["name"] == "docker" and c["args"][0] == "stats" for c in calls))
|
|
|
|
def test_empty_malformed_or_multiple_docker_stats_are_unavailable(self):
|
|
for text in ("", "--", "CPU=-- Memory=-- / -- BlockIO=-- / --", "CPU=bad% Memory=1 / 2 BlockIO=1 / 2",
|
|
"CPU=1% Memory=1 / 2", "CPU=1% Memory=1 / 2 BlockIO=1 / 2\nprivate extra"):
|
|
with self.subTest(text=text):
|
|
result, _ = self.exercise("docker", DOCKER_STATS=text)
|
|
self.assert_unavailable(result)
|
|
|
|
def test_docker_errors_preserve_exit_without_partial_or_raw_error_output(self):
|
|
for setting, value in (("DOCKER_INSPECT_EXIT", "2"), ("DOCKER_STATS_EXIT", "3")):
|
|
with self.subTest(setting=setting):
|
|
result, calls = self.exercise("docker", **{setting: value})
|
|
self.assert_unavailable(result)
|
|
self.assertEqual(result.returncode, int(value))
|
|
self.assertNotIn("sleep", [c["name"] for c in calls])
|
|
|
|
def test_docker_replacement_restart_or_stop_during_and_between_reads_is_unavailable(self):
|
|
for identity in (DOCKER_IDENTITY.replace(CONTAINER_ID, "b" * 64),
|
|
DOCKER_IDENTITY.replace("20:00:00", "20:01:00"),
|
|
DOCKER_IDENTITY[:-1] + "1", DOCKER_IDENTITY.replace("true", "false")):
|
|
for index in (1, 2, 3):
|
|
with self.subTest(identity=identity, index=index):
|
|
result, _ = self.exercise("docker", **{f"INSPECT_{index}": identity})
|
|
self.assert_unavailable(result)
|
|
|
|
def test_missing_timeout_stops_before_any_reader(self):
|
|
# No timeout in this private PATH. bash is invoked by absolute path.
|
|
with tempfile.TemporaryDirectory() as temporary:
|
|
for deployment, copied in recipes().items():
|
|
with self.subTest(deployment=deployment):
|
|
result = subprocess.run([shutil.which("bash"), "-c", copied],
|
|
env=dict(os.environ, PATH=temporary),
|
|
text=True, capture_output=True, timeout=3)
|
|
self.assert_unavailable(result)
|
|
self.assertIn("GNU timeout is required", result.stderr)
|
|
|
|
def test_real_deadline_stops_a_hung_reader_in_both_recipes(self):
|
|
for deployment, name in (("systemd", "systemctl"), ("docker", "docker")):
|
|
with self.subTest(deployment=deployment):
|
|
started = time.monotonic()
|
|
result, _ = self.exercise(deployment, HANG_TOOL=name)
|
|
self.assert_unavailable(result)
|
|
self.assertEqual(result.returncode, 137)
|
|
self.assertLess(time.monotonic() - started, 83)
|
|
|
|
def test_real_whole_group_deadline_stops_a_reader_ignoring_term(self):
|
|
started = time.monotonic()
|
|
result, _ = self.exercise("docker", HANG_TOOL="docker", IGNORE_TERM="1")
|
|
self.assert_unavailable(result)
|
|
self.assertEqual(result.returncode, 137)
|
|
self.assertLess(time.monotonic() - started, 83)
|
|
|
|
def test_guidance_preserves_scope_units_baselines_and_data_safety(self):
|
|
guide = " ".join(section().split())
|
|
for phrase in ("same PID and process start time", "actual elapsed seconds", "not a measured day's total",
|
|
"not bytes per second", "not a recent sampling window", "different scopes",
|
|
"inside the Pulse container", "does not make that data a clean", "Do not enable Debug",
|
|
"remove database indexes", "tmpfs", "Do not post databases", "manually redacted error",
|
|
"no partial identity", "no unbounded fallback", "full container ID", "does not elevate privileges"):
|
|
self.assertIn(phrase, guide)
|
|
for copied in recipes().values():
|
|
self.assertNotRegex(copied, r"\b(?:sudo|restart|rm|truncate|sqlite3|curl|printenv)\b|--follow|--token|(?:^|[;\n])\s*kill\b")
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|