mirror of
https://github.com/tailscale/tailscale.git
synced 2025-11-04 00:55:11 +00:00
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.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package controlclient
|
|
|
|
import (
|
|
"os/exec"
|
|
"strings"
|
|
"sync/atomic"
|
|
"syscall"
|
|
)
|
|
|
|
func init() {
|
|
osVersion = osVersionWindows
|
|
}
|
|
|
|
var winVerCache atomic.Value // of string
|
|
|
|
func osVersionWindows() string {
|
|
if s, ok := winVerCache.Load().(string); ok {
|
|
return s
|
|
}
|
|
cmd := exec.Command("cmd", "/c", "ver")
|
|
cmd.SysProcAttr = &syscall.SysProcAttr{HideWindow: true}
|
|
out, _ := cmd.Output() // "\nMicrosoft Windows [Version 10.0.19041.388]\n\n"
|
|
s := strings.TrimSpace(string(out))
|
|
s = strings.TrimPrefix(s, "Microsoft Windows [")
|
|
s = strings.TrimSuffix(s, "]")
|
|
|
|
// "Version 10.x.y.z", with "Version" localized. Keep only stuff after the space.
|
|
if sp := strings.Index(s, " "); sp != -1 {
|
|
s = s[sp+1:]
|
|
}
|
|
if s != "" {
|
|
winVerCache.Store(s)
|
|
}
|
|
return s // "10.0.19041.388", ideally
|
|
}
|