[core] Fix clean all windows (#12217)

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: J. Nick Koston <nick@home-assistant.io>

tests/unit_tests/test_writer.py

@@ -1,7 +1,9 @@
 """Test writer module functionality."""
 
 from collections.abc import Callable
+import os
 from pathlib import Path
+import stat
 from typing import Any
 from unittest.mock import MagicMock, patch
 
@@ -15,6 +17,7 @@ from esphome.writer import (
     CPP_INCLUDE_BEGIN,
     CPP_INCLUDE_END,
     GITIGNORE_CONTENT,
+    clean_all,
     clean_build,
     clean_cmake_cache,
     storage_should_clean,
@@ -1062,3 +1065,103 @@ def test_clean_all_preserves_json_files(
     # Verify logging mentions cleaning
     assert "Cleaning" in caplog.text
     assert str(build_dir) in caplog.text
+
+
+@patch("esphome.writer.CORE")
+def test_clean_build_handles_readonly_files(
+    mock_core: MagicMock,
+    tmp_path: Path,
+) -> None:
+    """Test clean_build handles read-only files (e.g., git pack files on Windows)."""
+    # Create directory structure with read-only files
+    pioenvs_dir = tmp_path / ".pioenvs"
+    pioenvs_dir.mkdir()
+    git_dir = pioenvs_dir / ".git" / "objects" / "pack"
+    git_dir.mkdir(parents=True)
+
+    # Create a read-only file (simulating git pack files on Windows)
+    readonly_file = git_dir / "pack-abc123.pack"
+    readonly_file.write_text("pack data")
+    os.chmod(readonly_file, stat.S_IRUSR)  # Read-only
+
+    # Setup mocks
+    mock_core.relative_pioenvs_path.return_value = pioenvs_dir
+    mock_core.relative_piolibdeps_path.return_value = tmp_path / ".piolibdeps"
+    mock_core.relative_build_path.return_value = tmp_path / "dependencies.lock"
+
+    # Verify file is read-only
+    assert not os.access(readonly_file, os.W_OK)
+
+    # Call the function - should not crash
+    clean_build()
+
+    # Verify directory was removed despite read-only files
+    assert not pioenvs_dir.exists()
+
+
+@patch("esphome.writer.CORE")
+def test_clean_all_handles_readonly_files(
+    mock_core: MagicMock,
+    tmp_path: Path,
+) -> None:
+    """Test clean_all handles read-only files."""
+    # Create config directory
+    config_dir = tmp_path / "config"
+    config_dir.mkdir()
+
+    build_dir = config_dir / ".esphome"
+    build_dir.mkdir()
+
+    # Create a subdirectory with read-only files
+    subdir = build_dir / "subdir"
+    subdir.mkdir()
+    readonly_file = subdir / "readonly.txt"
+    readonly_file.write_text("content")
+    os.chmod(readonly_file, stat.S_IRUSR)  # Read-only
+
+    # Verify file is read-only
+    assert not os.access(readonly_file, os.W_OK)
+
+    # Call the function - should not crash
+    clean_all([str(config_dir)])
+
+    # Verify directory was removed despite read-only files
+    assert not subdir.exists()
+    assert build_dir.exists()  # .esphome dir itself is preserved
+
+
+@patch("esphome.writer.CORE")
+def test_clean_build_reraises_for_other_errors(
+    mock_core: MagicMock,
+    tmp_path: Path,
+) -> None:
+    """Test clean_build re-raises errors that are not read-only permission issues."""
+    # Create directory structure with a read-only subdirectory
+    # This prevents file deletion and triggers the error handler
+    pioenvs_dir = tmp_path / ".pioenvs"
+    pioenvs_dir.mkdir()
+    subdir = pioenvs_dir / "subdir"
+    subdir.mkdir()
+    test_file = subdir / "test.txt"
+    test_file.write_text("content")
+
+    # Make subdir read-only so files inside can't be deleted
+    os.chmod(subdir, stat.S_IRUSR | stat.S_IXUSR)
+
+    # Setup mocks
+    mock_core.relative_pioenvs_path.return_value = pioenvs_dir
+    mock_core.relative_piolibdeps_path.return_value = tmp_path / ".piolibdeps"
+    mock_core.relative_build_path.return_value = tmp_path / "dependencies.lock"
+
+    try:
+        # Mock os.access in writer module to return True (writable)
+        # This simulates a case where the error is NOT due to read-only permissions
+        # so the error handler should re-raise instead of trying to fix permissions
+        with (
+            patch("esphome.writer.os.access", return_value=True),
+            pytest.raises(PermissionError),
+        ):
+            clean_build()
+    finally:
+        # Cleanup - restore write permission so tmp_path cleanup works
+        os.chmod(subdir, stat.S_IRWXU)