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std.windows: use posix semantics to delete files, if available #15501

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Merged
merged 3 commits into from
Jun 17, 2023

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matu3ba
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@matu3ba matu3ba commented Apr 29, 2023

Justification: When a file is deleted on Windows, it may not be immediately removed from the directory. This can cause problems with future scans of that directory, which will see the partially deleted file. Under some workloads and system configurations, Windows files may appear to be deleted immediately.

This is the PR with requested fixup. Thanks to @SpexGuy for the original PR.

Flags: ULONG,
};

const FILE_DISPOSITION_DO_NOT_DELETE: ULONG = 0x00000000;
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@matu3ba matu3ba Apr 29, 2023

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Should I namespace these?

SpexGuy and others added 2 commits May 1, 2023 15:46
Justification: When a file is deleted on Windows, it may not be
immediately removed from the directory. This can cause problems
with future scans of that directory, which will see the partially
deleted file. Under some workloads and system configurations,
Windows files may appear to be deleted immediately.

This is the PR with requested fixup. Thanks to @SpexGuy for the
original PR.
FILE_DISPOSITION_ON_CLOSE is used to set/clear the FILE_DELETE_ON_CLOSE,
but we do not use that anymore and FILE_DISPOSITION_POSIX_SEMANTICS
already implies unmapping of the handle and removal fo it on close.
@matu3ba matu3ba force-pushed the win_rmwithposix branch from a89faad to be50dbf Compare May 1, 2023 13:47
@matu3ba matu3ba marked this pull request as ready for review May 1, 2023 19:42
@squeek502
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squeek502 commented May 7, 2023

Something else to double check: does FILE_DISPOSITION_POSIX_SEMANTICS mean that the path becomes case-sensitive? Would this test case pass or fail in this branch?

test "delete case-insensitivity on windows" {
    if (builtin.os.tag != .windows) return error.SkipZigTest;

    var tmp = tmpDir(.{});
    defer tmp.cleanup();

    var file = try tmp.dir.createFile("TEST_FILE", .{});
    file.close();

    try tmp.dir.deleteFile("test_file");
}

(will try it out myself in a bit)

EDIT: It passes, so no worries there 👍

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5 participants