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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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4
wgengine/userspace.go
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@@ -534,7 +534,7 @@ func (e *userspaceEngine) pollResolver() {
}
}
var debugTrimWireguard = envknob.OptBool("TS_DEBUG_TRIM_WIREGUARD")
var debugTrimWireguard = envknob.RegisterOptBool("TS_DEBUG_TRIM_WIREGUARD")
// forceFullWireguardConfig reports whether we should give wireguard our full
// network map, even for inactive peers.
@@ -550,7 +550,7 @@ var debugTrimWireguard = envknob.OptBool("TS_DEBUG_TRIM_WIREGUARD")
// with these knobs in place.
func forceFullWireguardConfig(numPeers int) bool {
// Did the user explicitly enable trimmming via the environment variable knob?
if b, ok := debugTrimWireguard.Get(); ok {
if b, ok := debugTrimWireguard().Get(); ok {
return !b
}
if opt := controlclient.TrimWGConfig(); opt != "" {