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85 lines
2.7 KiB
Python
85 lines
2.7 KiB
Python
"""Regression: the ZIP-update directory replace must never leave a half-deleted tree.
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Issue #49145: on Windows the ZIP-update path did ``rmtree(dst); copytree(...)``.
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A copy that failed partway (file locks / flaky I/O — the very conditions the ZIP
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path exists to work around) left the directory deleted with nothing copied back,
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which broke ``hermes --tui`` because ``ui-tui/`` had vanished.
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``_atomic_replace_dir`` stages the new copy first and only swaps it in on full
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success, so a mid-copy failure leaves the original directory intact.
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"""
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from __future__ import annotations
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import shutil
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from pathlib import Path
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import pytest
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from hermes_cli.main import _atomic_replace_dir
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def test_atomic_replace_swaps_content_on_success(tmp_path: Path) -> None:
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src = tmp_path / "src" / "ui-tui"
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src.mkdir(parents=True)
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(src / "new.txt").write_text("NEW")
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dst = tmp_path / "install" / "ui-tui"
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dst.mkdir(parents=True)
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(dst / "old.txt").write_text("OLD")
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_atomic_replace_dir(str(src), str(dst))
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assert (dst / "new.txt").read_text() == "NEW"
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assert not (dst / "old.txt").exists()
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# No staging/backup siblings left behind.
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assert not (dst.parent / "ui-tui.hermes-update-staging").exists()
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assert not (dst.parent / "ui-tui.hermes-update-old").exists()
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def test_atomic_replace_leaves_original_intact_when_copy_fails(
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tmp_path: Path, monkeypatch
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) -> None:
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src = tmp_path / "src" / "ui-tui"
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src.mkdir(parents=True)
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(src / "a.txt").write_text("A")
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dst = tmp_path / "install" / "ui-tui"
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dst.mkdir(parents=True)
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(dst / "keep.txt").write_text("PRECIOUS")
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def boom(*_a, **_k):
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raise OSError("[WinError 5] Access is denied")
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monkeypatch.setattr(shutil, "copytree", boom)
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with pytest.raises(OSError):
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_atomic_replace_dir(str(src), str(dst))
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# The whole point: the live directory survives a failed update untouched.
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assert dst.is_dir()
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assert (dst / "keep.txt").read_text() == "PRECIOUS"
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assert not (dst.parent / "ui-tui.hermes-update-staging").exists()
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def test_atomic_replace_clears_stale_staging_leftovers(tmp_path: Path) -> None:
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"""A previously-interrupted update can leave staging/backup dirs behind."""
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src = tmp_path / "src" / "ui-tui"
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src.mkdir(parents=True)
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(src / "new.txt").write_text("NEW")
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dst = tmp_path / "install" / "ui-tui"
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dst.mkdir(parents=True)
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stale_staging = dst.parent / "ui-tui.hermes-update-staging"
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stale_backup = dst.parent / "ui-tui.hermes-update-old"
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stale_staging.mkdir()
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stale_backup.mkdir()
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(stale_staging / "junk").write_text("junk")
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_atomic_replace_dir(str(src), str(dst))
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assert (dst / "new.txt").read_text() == "NEW"
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assert not stale_staging.exists()
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assert not stale_backup.exists()
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