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atomicfile: use ReplaceFile on Windows so that attributes and ACLs are preserved

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I moved the actual rename into separate, GOOS-specific files. On
non-Windows, we do a simple os.Rename. On Windows, we first try
ReplaceFile with a fallback to os.Rename if the target file does
not exist.

ReplaceFile is the recommended way to rename the file in this use case,
as it preserves attributes and ACLs set on the target file.

Updates #14428

Signed-off-by: Aaron Klotz <aaron@tailscale.com>
This commit is contained in:
Aaron Klotz
2025-01-13 13:02:47 -07:00
parent 3431ab1720
commit fcf90260ce
10 changed files with 261 additions and 7 deletions
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8
atomicfile/mksyscall.go Normal file
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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package atomicfile
//go:generate go run golang.org/x/sys/windows/mkwinsyscall -output zsyscall_windows.go mksyscall.go
//sys replaceFileW(replaced *uint16, replacement *uint16, backup *uint16, flags uint32, exclude unsafe.Pointer, reserved unsafe.Pointer) (err error) [int32(failretval)==0] = kernel32.ReplaceFileW