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clientupdate: refuse to update in tsnet binaries (#14911)

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When running via tsnet, c2n will be hooked up so requests to update can
reach the node. But it will then apply whatever OS-specific update
function, upgrading the local tailscaled instead.

We can't update tsnet automatically, so refuse it.

Fixes #14892

Signed-off-by: Andrew Lytvynov <awly@tailscale.com>
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Andrew Lytvynov 2025-02-04 15:51:03 -08:00 committed by GitHub
parent 9726e1f208
commit e19c01f5b3
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7
clientupdate/clientupdate.go
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@ -27,6 +27,7 @@ import (
"strconv"
"strings"
"tailscale.com/hostinfo"
"tailscale.com/types/logger"
"tailscale.com/util/cmpver"
"tailscale.com/version"
@ -169,6 +170,12 @@ func NewUpdater(args Arguments) (*Updater, error) {
type updateFunction func() error
func (up *Updater) getUpdateFunction() (fn updateFunction, canAutoUpdate bool) {
hi := hostinfo.New()
// We don't know how to update custom tsnet binaries, it's up to the user.
if hi.Package == "tsnet" {
return nil, false
}
switch runtime.GOOS {
case "windows":
return up.updateWindows, true