Merge "Add a warning message about missing gcert at the end of the build"

ui/build/config.go

@@ -1223,6 +1223,21 @@ func (c *configImpl) rbeAuth() (string, string) {
 	return "RBE_use_application_default_credentials", "true"
 }
 
+func (c *configImpl) IsGooglerEnvironment() bool {
+	cf := "ANDROID_BUILD_ENVIRONMENT_CONFIG"
+	if v, ok := c.environ.Get(cf); ok {
+		return v == "googler"
+	}
+	return false
+}
+
+func (c *configImpl) GoogleProdCredsExist() bool {
+	if _, err := exec.Command("/usr/bin/prodcertstatus", "--simple_output", "--nocheck_loas").Output(); err != nil {
+		return false
+	}
+	return true
+}
+
 func (c *configImpl) UseRemoteBuild() bool {
 	return c.UseGoma() || c.UseRBE()
 }

ui/build/rbe.go

@@ -119,6 +119,7 @@ func startRBE(ctx Context, config Config) {
 }
 
 func stopRBE(ctx Context, config Config) {
+	defer checkProdCreds(ctx, config)
 	cmd := Command(ctx, config, "stopRBE bootstrap", rbeCommand(ctx, config, bootstrapCmd), "-shutdown")
 	output, err := cmd.CombinedOutput()
 	if err != nil {
@@ -131,6 +132,15 @@ func stopRBE(ctx Context, config Config) {
 	}
 }
 
+func checkProdCreds(ctx Context, config Config) {
+	if !config.IsGooglerEnvironment() || config.GoogleProdCredsExist() {
+		return
+	}
+	fmt.Fprintln(ctx.Writer, "")
+	fmt.Fprintln(ctx.Writer, "\033[33mWARNING: Missing LOAS credentials, please run `gcert`. This will result in failing RBE builds in the future, see go/build-fast#authentication.\033[0m")
+	fmt.Fprintln(ctx.Writer, "")
+}
+
 // DumpRBEMetrics creates a metrics protobuf file containing RBE related metrics.
 // The protobuf file is created if RBE is enabled and the proxy service has
 // started. The proxy service is shutdown in order to dump the RBE metrics to the