Privatae
29 lines
902 B
Go
29 lines
902 B
Go
//go:build windows
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package main
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// The WEAK cache key on Windows, and it is named weak because it is.
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//
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// Go hands back a syscall.Win32FileAttributeData from FileInfo.Sys(): creation,
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// last-access and last-write times, plus the size. There is no file identity
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// (no volume serial + file index without opening a handle) and no change time,
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// so a file overwritten in place with its size, write time and creation time
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// restored keys identically to the original. deltaCacheWeakTTL is what covers
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// that, and `false` here is what turns it on.
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import (
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"os"
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"strconv"
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"syscall"
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)
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func statIdentity(fi os.FileInfo) (string, bool) {
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d, ok := fi.Sys().(*syscall.Win32FileAttributeData)
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if !ok {
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return "", false
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}
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return strconv.FormatInt(fi.Size(), 10) + ":" +
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strconv.FormatInt(d.LastWriteTime.Nanoseconds(), 10) + ":" +
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strconv.FormatInt(d.CreationTime.Nanoseconds(), 10), false
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}
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