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6fbc9b3a98
To atone for1d7f9d5b4a, the revert of4224b3f731. At least it's fast again, even if it's shelling out to cmd.exe (once now). Updates #1478 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
40 lines
962 B
Go
40 lines
962 B
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package controlclient
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import (
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"os/exec"
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"strings"
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"sync/atomic"
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"syscall"
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)
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func init() {
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osVersion = osVersionWindows
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}
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var winVerCache atomic.Value // of string
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func osVersionWindows() string {
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if s, ok := winVerCache.Load().(string); ok {
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return s
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}
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cmd := exec.Command("cmd", "/c", "ver")
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cmd.SysProcAttr = &syscall.SysProcAttr{HideWindow: true}
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out, _ := cmd.Output() // "\nMicrosoft Windows [Version 10.0.19041.388]\n\n"
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s := strings.TrimSpace(string(out))
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s = strings.TrimPrefix(s, "Microsoft Windows [")
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s = strings.TrimSuffix(s, "]")
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// "Version 10.x.y.z", with "Version" localized. Keep only stuff after the space.
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if sp := strings.Index(s, " "); sp != -1 {
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s = s[sp+1:]
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}
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if s != "" {
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winVerCache.Store(s)
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}
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return s // "10.0.19041.388", ideally
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}
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