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envknob: support changing envknobs post-init

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Updates #5114

Change-Id: Ia423fc7486e1b3f3180a26308278be0086fae49b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-09-14 12:49:39 -07:00
committed by Brad Fitzpatrick
parent 33ee2c058e
commit 74674b110d
31 changed files with 311 additions and 167 deletions
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10
control/controlknobs/controlknobs.go
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@@ -13,20 +13,18 @@ import (
)
// disableUPnP indicates whether to attempt UPnP mapping.
var disableUPnP atomic.Bool
var disableUPnPControl atomic.Bool
func init() {
SetDisableUPnP(envknob.Bool("TS_DISABLE_UPNP"))
}
var disableUPnpEnv = envknob.RegisterBool("TS_DISABLE_UPNP")
// DisableUPnP reports the last reported value from control
// whether UPnP portmapping should be disabled.
func DisableUPnP() bool {
return disableUPnP.Load()
return disableUPnPControl.Load() || disableUPnpEnv()
}
// SetDisableUPnP sets whether control says that UPnP should be
// disabled.
func SetDisableUPnP(v bool) {
disableUPnP.Store(v)
disableUPnPControl.Store(v)
}