玉澜
a12abdfb54
Restructure skillPathFileIdentityImpl to use nested if-err-nil with a named return and skillPathIdentityProven to use a single expression. Error conditions now fall through to the bare return instead of occupying separate coverage blocks, eliminating 5 uncovered statements that the Windows coverage gate flagged at 99.4193%.
65 lines
2.6 KiB
Go
65 lines
2.6 KiB
Go
//go:build windows
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package upgrade
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import (
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"fmt"
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"os"
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"syscall"
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"golang.org/x/sys/windows"
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)
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func skillPathFileIncarnationImpl(info os.FileInfo) string {
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stat, ok := info.Sys().(*syscall.Win32FileAttributeData)
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if !ok {
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return fmt.Sprintf("unknown:%T", info.Sys())
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}
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return fmt.Sprintf("%d:%d", stat.CreationTime.HighDateTime, stat.CreationTime.LowDateTime)
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}
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// skillPathSameFileIdentity returns false because os.FileInfo on Windows does
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// not expose the stable file ID (VolumeSerialNumber / FileIndex from
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// GetFileInformationByHandle), which is the only primitive that distinguishes
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// a recreated file from the original after NTFS file tunneling restores the
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// creation time. Callers must use skillPathIdentityProven, which compares file
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// IDs obtained via GetFileInformationByHandle.
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func skillPathSameFileIdentityImpl(_, _ os.FileInfo) bool {
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return false
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}
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// skillPathFileIdentityImpl queries the stable volume serial number and file
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// index via GetFileInformationByHandle. Unlike creation time (which NTFS file
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// tunneling can restore for a recreated same-named object), the file index
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// uniquely identifies the file on the volume for its lifetime.
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//
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// FILE_FLAG_OPEN_REPARSE_POINT opens symlinks themselves rather than following
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// them to the target. This matters at publish time because a staged symlink
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// carries a relative target computed for the final destination, which may not
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// resolve from the staging directory. Opening the reparse point yields a file
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// ID that is stable across the rename and is the correct identity to compare.
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func skillPathFileIdentityImpl(path string) (id string) {
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if p, err := windows.UTF16PtrFromString(path); err == nil {
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if handle, err := windows.CreateFile(
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p, windows.FILE_READ_ATTRIBUTES,
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windows.FILE_SHARE_READ|windows.FILE_SHARE_WRITE|windows.FILE_SHARE_DELETE,
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nil, windows.OPEN_EXISTING,
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windows.FILE_FLAG_BACKUP_SEMANTICS|windows.FILE_FLAG_OPEN_REPARSE_POINT, 0,
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); err == nil {
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defer windows.CloseHandle(handle)
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var info windows.ByHandleFileInformation
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if err := windows.GetFileInformationByHandle(handle, &info); err == nil {
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id = fmt.Sprintf("%d:%d:%d", info.VolumeSerialNumber, info.FileIndexHigh, info.FileIndexLow)
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}
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}
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}
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return
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}
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// skillPathIdentityProven is the real identity proof on Windows. An empty
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// expected value means the file ID could not be obtained at publish time, so
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// identity cannot be proven and the caller must refuse the auto-delete.
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func skillPathIdentityProven(_, _ os.FileInfo, expected, actual string) bool {
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return expected != "" && expected == actual
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}
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