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net: don't wait 5 seconds to re-read /etc/resolv.conf #92

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merged 1 commit into from
Aug 8, 2024
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net: don't wait 5 seconds to re-read /etc/resolv.conf #92

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2 changes: 1 addition & 1 deletion src/net/conf_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -396,7 +396,7 @@ func TestConfHostLookupOrder(t *testing.T) {
defer conf.teardown()

for _, tt := range tests {
if !conf.forceUpdateConf(tt.resolv, time.Now().Add(time.Hour)) {
if !conf.forceUpdateConf(tt.resolv, distantFuture) {
t.Errorf("%s: failed to change resolv config", tt.name)
}
for _, ht := range tt.hostTests {
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9 changes: 7 additions & 2 deletions src/net/dnsclient_unix.go
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Original file line number Diff line number Diff line change
Expand Up @@ -393,13 +393,18 @@ func (conf *resolverConfig) init() {
conf.ch = make(chan struct{}, 1)
}

// distantFuture is a sentinel time used for tests to signal that
// resolv.conf should not be rechecked.
var distantFuture = time.Now().Add(1000 * time.Hour)

// tryUpdate tries to update conf with the named resolv.conf file.
// The name variable only exists for testing. It is otherwise always
// "/etc/resolv.conf".
func (conf *resolverConfig) tryUpdate(name string) {
conf.initOnce.Do(conf.init)

if conf.dnsConfig.Load().noReload {
dc := conf.dnsConfig.Load()
if dc.noReload {
return
}

Expand All @@ -410,7 +415,7 @@ func (conf *resolverConfig) tryUpdate(name string) {
defer conf.releaseSema()

now := time.Now()
if conf.lastChecked.After(now.Add(-5 * time.Second)) {
if len(dc.servers) > 0 && conf.lastChecked.After(now.Add(-5*time.Second)) || conf.lastChecked == distantFuture {
return
}
conf.lastChecked = now
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