tailcfg: add Clone methods to Login and DNSConfig

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>

tailcfg/tailcfg.go

@@ -4,7 +4,7 @@
 
 package tailcfg
 
-//go:generate go run tailscale.com/cmd/cloner -type=User,Node,Hostinfo,NetInfo,Group,Role,Capability -output=tailcfg_clone.go
+//go:generate go run tailscale.com/cmd/cloner -type=User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig -output=tailcfg_clone.go
 
 import (
 	"bytes"

tailcfg/tailcfg_clone.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Code generated by tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability; DO NOT EDIT.
+// Code generated by tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig; DO NOT EDIT.
 
 package tailcfg
 
@@ -108,3 +108,27 @@ func (src *Capability) Clone() *Capability {
 	*dst = *src
 	return dst
 }
+
+// Clone makes a deep copy of Login.
+// The result aliases no memory with the original.
+func (src *Login) Clone() *Login {
+	if src == nil {
+		return nil
+	}
+	dst := new(Login)
+	*dst = *src
+	return dst
+}
+
+// Clone makes a deep copy of DNSConfig.
+// The result aliases no memory with the original.
+func (src *DNSConfig) Clone() *DNSConfig {
+	if src == nil {
+		return nil
+	}
+	dst := new(DNSConfig)
+	*dst = *src
+	dst.Nameservers = append(src.Nameservers[:0:0], src.Nameservers...)
+	dst.Domains = append(src.Domains[:0:0], src.Domains...)
+	return dst
+}

tstest/resource.go

@@ -39,7 +39,7 @@ func goroutineDump() (int, string) {
 	return p.Count(), b.String()
 }
 
-func (r *ResourceCheck) Assert(t *testing.T) {
+func (r *ResourceCheck) Assert(t testing.TB) {
 	t.Helper()
 	want := r.startNumRoutines