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https://github.com/SCST-project/scst.git
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Gleb Chesnokov
05502f10b2
Extract the per-worktree build lock ahead of the Sparse/Smatch and Cppcheck drivers. Keep one advisory lock file for analyzer builds that share generated state; release the descriptor on success or exception without unlinking the file. Document that callers must hold the lock around build-state changes and log reset, and that ordinary builds are not covered by this advisory lock. Add isolated fixtures checking cross-process contention, lock reuse and release after an exception. Kbuild collection and analyzer-specific build targets remain with their respective integration series.
54 lines
1.8 KiB
Python
54 lines
1.8 KiB
Python
"""Check analyzer build locking without invoking a compiler or SCST."""
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from pathlib import Path
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import subprocess
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import sys
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import tempfile
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import unittest
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sys.dont_write_bytecode = True
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sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
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from lint_kbuild import build_lock
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class BuildLockTests(unittest.TestCase):
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def try_lock(self, path):
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script = """
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import fcntl, sys
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with open(sys.argv[1], 'a') as lock:
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try:
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fcntl.flock(lock, fcntl.LOCK_EX | fcntl.LOCK_NB)
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except BlockingIOError:
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sys.exit(7)
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"""
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return subprocess.run([sys.executable, "-c", script, str(path)],
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capture_output=True, timeout=5)
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def test_competing_process_cannot_acquire_held_lock(self):
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with tempfile.TemporaryDirectory() as directory:
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root = Path(directory)
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path = root / ".cache/lint/kbuild.lock"
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with build_lock(root):
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inode = path.stat().st_ino
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result = self.try_lock(path)
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self.assertEqual(result.returncode, 7, result.stderr)
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result = self.try_lock(path)
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self.assertEqual(result.returncode, 0, result.stderr)
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with build_lock(root):
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self.assertEqual(path.stat().st_ino, inode)
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result = self.try_lock(path)
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self.assertEqual(result.returncode, 7, result.stderr)
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def test_exception_releases_the_lock(self):
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with tempfile.TemporaryDirectory() as directory:
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root = Path(directory)
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with self.assertRaisesRegex(ValueError, "build failed"):
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with build_lock(root):
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raise ValueError("build failed")
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result = self.try_lock(root / ".cache/lint/kbuild.lock")
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self.assertEqual(result.returncode, 0, result.stderr)
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if __name__ == "__main__":
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unittest.main()
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