validate resources only during build time

helper/schema/provider.go

@@ -143,15 +143,17 @@ func (p *Provider) InternalValidate() error {
 		}
 	}
 
-	for k, r := range p.ResourcesMap {
-		if err := r.InternalValidate(nil, true); err != nil {
-			validationErrors = multierror.Append(validationErrors, fmt.Errorf("resource %s: %s", k, err))
+	if currentRuntimeStage == buildingProviderStage {
+		for k, r := range p.ResourcesMap {
+			if err := r.InternalValidate(nil, true); err != nil {
+				validationErrors = multierror.Append(validationErrors, fmt.Errorf("resource %s: %s", k, err))
+			}
 		}
-	}
 
-	for k, r := range p.DataSourcesMap {
-		if err := r.InternalValidate(nil, false); err != nil {
-			validationErrors = multierror.Append(validationErrors, fmt.Errorf("data source %s: %s", k, err))
+		for k, r := range p.DataSourcesMap {
+			if err := r.InternalValidate(nil, false); err != nil {
+				validationErrors = multierror.Append(validationErrors, fmt.Errorf("data source %s: %s", k, err))
+			}
 		}
 	}
 

helper/schema/runtime.go

@@ -0,0 +1,31 @@
+// Copied from https://github.com/pulumi/pulumi-terraform-bridge/blob/7c411fc807e709a85170cab0add5cb3a856c0c25/pkg/tfbridge/runtime.go#L1
+package schema
+
+import (
+	"runtime/debug"
+	"strings"
+)
+
+// Used internally for the code to distinguish if it is running at build-time or at runtime.
+type runtimeStage int
+
+const (
+	unknownStage runtimeStage = iota
+	buildingProviderStage
+	runningProviderStage
+)
+
+var currentRuntimeStage = guessRuntimeStage()
+
+func guessRuntimeStage() runtimeStage {
+	buildInfo, _ := debug.ReadBuildInfo()
+	stage := unknownStage
+	if buildInfo != nil {
+		if strings.Contains(buildInfo.Path, "pulumi-tfgen") {
+			stage = buildingProviderStage
+		} else if strings.Contains(buildInfo.Path, "pulumi-resource") {
+			stage = runningProviderStage
+		}
+	}
+	return stage
+}