Remove use_username_in_magic_dns option

Upgrade the use of dns.use_username_in_magic_dns or
dns_config.use_username_in_magic_dns to a fatal error and remove the
option from the example configuration and integration tests.

Fixes: #2219

hscontrol/types/config.go

@@ -322,14 +322,12 @@ func validateServerConfig() error {
 	depr.fatalIfNewKeyIsNotUsed("dns.nameservers.split", "dns_config.restricted_nameservers")
 	depr.fatalIfNewKeyIsNotUsed("dns.search_domains", "dns_config.domains")
 	depr.fatalIfNewKeyIsNotUsed("dns.extra_records", "dns_config.extra_records")
-	depr.warn("dns_config.use_username_in_magic_dns")
-	depr.warn("dns.use_username_in_magic_dns")
+	depr.fatal("dns.use_username_in_magic_dns")
+	depr.fatal("dns_config.use_username_in_magic_dns")
 
 	// TODO(kradalby): Reintroduce when strip_email_domain is removed
 	// after #2170 is cleaned up
 	// depr.fatal("oidc.strip_email_domain")
-	depr.fatal("dns.use_username_in_musername_in_magic_dns")
-	depr.fatal("dns_config.use_username_in_musername_in_magic_dns")
 
 	depr.Log()
 
@@ -337,7 +335,8 @@ func validateServerConfig() error {
 		// TODO(kradalby): Reintroduce when strip_email_domain is removed
 		// after #2170 is cleaned up
 		// "oidc.strip_email_domain",
-		"dns_config.use_username_in_musername_in_magic_dns",
+		"dns.use_username_in_magic_dns",
+		"dns_config.use_username_in_magic_dns",
 	} {
 		if viper.IsSet(removed) {
 			log.Fatal().

hscontrol/types/testdata/base-domain-in-server-url.yaml

@@ -13,4 +13,3 @@ server_url: "https://server.derp.no"
 dns:
   magic_dns: true
   base_domain: derp.no
-  use_username_in_magic_dns: false

hscontrol/types/testdata/base-domain-not-in-server-url.yaml

@@ -13,4 +13,3 @@ server_url: "https://derp.no"
 dns:
   magic_dns: true
   base_domain: clients.derp.no
-  use_username_in_magic_dns: false

hscontrol/types/testdata/dns_full.yaml

@@ -33,5 +33,3 @@ dns:
 
     # you can also put it in one line
     - { name: "prometheus.myvpn.example.com", type: "A", value: "100.64.0.4" }
-
-  use_username_in_magic_dns: true

hscontrol/types/testdata/dns_full_no_magic.yaml

@@ -33,5 +33,3 @@ dns:
 
     # you can also put it in one line
     - { name: "prometheus.myvpn.example.com", type: "A", value: "100.64.0.4" }
-
-  use_username_in_magic_dns: true