all: illumos/solaris userspace only support

Updates #14565

Change-Id: I743148144938794db0a224873ce76c10dbe6fa5f
Signed-off-by: Nahum Shalman <nahamu@gmail.com>

ipn/ipnlocal/local.go

@@ -4176,7 +4176,7 @@ func (b *LocalBackend) peerAPIServicesLocked() (ret []tailcfg.Service) {
 		})
 	}
 	switch runtime.GOOS {
-	case "linux", "freebsd", "openbsd", "illumos", "darwin", "windows", "android", "ios":
+	case "linux", "freebsd", "openbsd", "illumos", "solaris", "darwin", "windows", "android", "ios":
 		// These are the platforms currently supported by
 		// net/dns/resolver/tsdns.go:Resolver.HandleExitNodeDNSQuery.
 		ret = append(ret, tailcfg.Service{

ipn/ipnserver/actor.go

@@ -96,7 +96,7 @@ func (a *actor) Username() (string, error) {
 		}
 		defer tok.Close()
 		return tok.Username()
-	case "darwin", "linux":
+	case "darwin", "linux", "illumos", "solaris":
 		uid, ok := a.ci.Creds().UserID()
 		if !ok {
 			return "", errors.New("missing user ID")

ipn/ipnstate/ipnstate.go

@@ -650,6 +650,8 @@ func osEmoji(os string) string {
 		return "🐡"
 	case "illumos":
 		return "☀️"
+	case "solaris":
+		return "🌤️"
 	}
 	return "👽"
 }

ipn/localapi/localapi.go

@@ -1097,7 +1097,7 @@ func (h *Handler) serveServeConfig(w http.ResponseWriter, r *http.Request) {
 
 func authorizeServeConfigForGOOSAndUserContext(goos string, configIn *ipn.ServeConfig, h *Handler) error {
 	switch goos {
-	case "windows", "linux", "darwin":
+	case "windows", "linux", "darwin", "illumos", "solaris":
 	default:
 		return nil
 	}
@@ -1117,7 +1117,7 @@ func authorizeServeConfigForGOOSAndUserContext(goos string, configIn *ipn.ServeC
 	switch goos {
 	case "windows":
 		return errors.New("must be a Windows local admin to serve a path")
-	case "linux", "darwin":
+	case "linux", "darwin", "illumos", "solaris":
 		return errors.New("must be root, or be an operator and able to run 'sudo tailscale' to serve a path")
 	default:
 		// We filter goos at the start of the func, this default case

ipn/localapi/localapi_test.go

@@ -237,7 +237,7 @@ func TestShouldDenyServeConfigForGOOSAndUserContext(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-		for _, goos := range []string{"linux", "windows", "darwin"} {
+		for _, goos := range []string{"linux", "windows", "darwin", "illumos", "solaris"} {
 			t.Run(goos+"-"+tt.name, func(t *testing.T) {
 				err := authorizeServeConfigForGOOSAndUserContext(goos, tt.configIn, tt.h)
 				gotErr := err != nil