only set username and email if valid

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

Dockerfile.tailscale-HEAD

@@ -28,9 +28,7 @@ ARG VERSION_GIT_HASH=""
 ENV VERSION_GIT_HASH=$VERSION_GIT_HASH
 ARG TARGETARCH
 
-ARG BUILD_TAGS=""
-
-RUN GOARCH=$TARGETARCH go install -tags="${BUILD_TAGS}" -ldflags="\
+RUN GOARCH=$TARGETARCH go install -ldflags="\
       -X tailscale.com/version.longStamp=$VERSION_LONG \
       -X tailscale.com/version.shortStamp=$VERSION_SHORT \
       -X tailscale.com/version.gitCommitStamp=$VERSION_GIT_HASH" \

integration/embedded_derp_test.go

@@ -55,7 +55,7 @@ func TestDERPServerWebsocketScenario(t *testing.T) {
 	spec := map[string]ClientsSpec{
 		"user1": {
 			Plain:         0,
-			WebsocketDERP: 2,
+			WebsocketDERP: len(MustTestVersions),
 		},
 	}
 
@@ -239,13 +239,10 @@ func (s *EmbeddedDERPServerScenario) CreateHeadscaleEnv(
 
 		if clientCount.WebsocketDERP > 0 {
 			// Containers that use DERP-over-WebSocket
-			// Note that these clients *must* be built
-			// from source, which is currently
-			// only done for HEAD.
 			err = s.CreateTailscaleIsolatedNodesInUser(
 				hash,
 				userName,
-				tsic.VersionHead,
+				"all",
 				clientCount.WebsocketDERP,
 				tsic.WithWebsocketDERP(true),
 			)

integration/tsic/tsic.go

@@ -12,7 +12,6 @@ import (
 	"net/netip"
 	"net/url"
 	"os"
-	"reflect"
 	"strconv"
 	"strings"
 	"time"
@@ -45,11 +44,6 @@ var (
 	errTailscaleCannotUpWithoutAuthkey = errors.New("cannot up without authkey")
 	errTailscaleNotConnected           = errors.New("tailscale not connected")
 	errTailscaledNotReadyForLogin      = errors.New("tailscaled not ready for login")
-	errInvalidClientConfig             = errors.New("verifiably invalid client config requested")
-)
-
-const (
-	VersionHead = "head"
 )
 
 func errTailscaleStatus(hostname string, err error) error {
@@ -80,13 +74,6 @@ type TailscaleInContainer struct {
 	withExtraHosts    []string
 	workdir           string
 	netfilter         string
-
-	// build options, solely for HEAD
-	buildConfig TailscaleInContainerBuildConfig
-}
-
-type TailscaleInContainerBuildConfig struct {
-	tags []string
 }
 
 // Option represent optional settings that can be given to a
@@ -188,22 +175,6 @@ func WithNetfilter(state string) Option {
 	}
 }
 
-// WithBuildTag adds an additional value to the `-tags=` parameter
-// of the Go compiler, allowing callers to customize the Tailscale client build.
-// This option is only meaningful when invoked on **HEAD** versions of the client.
-// Attempts to use it with any other version is a bug in the calling code.
-func WithBuildTag(tag string) Option {
-	return func(tsic *TailscaleInContainer) {
-		if tsic.version != VersionHead {
-			panic(errInvalidClientConfig)
-		}
-
-		tsic.buildConfig.tags = append(
-			tsic.buildConfig.tags, tag,
-		)
-	}
-}
-
 // New returns a new TailscaleInContainer instance.
 func New(
 	pool *dockertest.Pool,
@@ -248,12 +219,6 @@ func New(
 	}
 
 	if tsic.withWebsocketDERP {
-		if version != VersionHead {
-			return tsic, errInvalidClientConfig
-		}
-
-		WithBuildTag("ts_debug_websockets")(tsic)
-
 		tailscaleOptions.Env = append(
 			tailscaleOptions.Env,
 			fmt.Sprintf("TS_DEBUG_DERP_WS_CLIENT=%t", tsic.withWebsocketDERP),
@@ -280,36 +245,14 @@ func New(
 	}
 
 	var container *dockertest.Resource
-
-	if version != VersionHead {
-		// build options are not meaningful with pre-existing images,
-		// let's not lead anyone astray by pretending otherwise.
-		defaultBuildConfig := TailscaleInContainerBuildConfig{}
-		hasBuildConfig := !reflect.DeepEqual(defaultBuildConfig, tsic.buildConfig)
-		if hasBuildConfig {
-			return tsic, errInvalidClientConfig
-		}
-	}
-
 	switch version {
-	case VersionHead:
+	case "head":
 		buildOptions := &dockertest.BuildOptions{
 			Dockerfile: "Dockerfile.tailscale-HEAD",
 			ContextDir: dockerContextPath,
 			BuildArgs:  []docker.BuildArg{},
 		}
 
-		buildTags := strings.Join(tsic.buildConfig.tags, ",")
-		if len(buildTags) > 0 {
-			buildOptions.BuildArgs = append(
-				buildOptions.BuildArgs,
-				docker.BuildArg{
-					Name:  "BUILD_TAGS",
-					Value: buildTags,
-				},
-			)
-		}
-
 		container, err = pool.BuildAndRunWithBuildOptions(
 			buildOptions,
 			tailscaleOptions,