DNS_KEEP_NAMESERVER variable, refers to #188

internal/params/dns.go

@@ -157,3 +157,9 @@ func (r *reader) GetDNSPlaintext() (ip net.IP, err error) {
 	}
 	return ip, nil
 }
+
+// GetDNSKeepNameserver obtains if the nameserver present in /etc/resolv.conf
+// should be kept instead of overridden, from the environment variable DNS_KEEP_NAMESERVER
+func (r *reader) GetDNSKeepNameserver() (on bool, err error) {
+	return r.envParams.GetOnOff("DNS_KEEP_NAMESERVER", libparams.Default("off"))
+}

internal/params/params.go

@@ -30,6 +30,7 @@ type Reader interface {
 	GetDNSOverTLSIPv6() (ipv6 bool, err error)
 	GetDNSUpdatePeriod() (period time.Duration, err error)
 	GetDNSPlaintext() (ip net.IP, err error)
+	GetDNSKeepNameserver() (on bool, err error)
 
 	// System
 	GetUID() (uid int, err error)