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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
health/health.go
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@@ -325,7 +325,7 @@ func OverallError() error {
return overallErrorLocked()
}
var fakeErrForTesting = envknob.String("TS_DEBUG_FAKE_HEALTH_ERROR")
var fakeErrForTesting = envknob.RegisterString("TS_DEBUG_FAKE_HEALTH_ERROR")
func overallErrorLocked() error {
if !anyInterfaceUp {
@@ -383,7 +383,7 @@ func overallErrorLocked() error {
for _, s := range controlHealth {
errs = append(errs, errors.New(s))
}
if e := fakeErrForTesting; len(errs) == 0 && e != "" {
if e := fakeErrForTesting(); len(errs) == 0 && e != "" {
return errors.New(e)
}
sort.Slice(errs, func(i, j int) bool {