actions: allow invoke only on local execution while TFC adds support (#37653)

* actions: allow invoke only on local execution while TFC adds support

* actually return early

internal/command/plan.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 
 	"github.com/hashicorp/terraform/internal/backend/backendrun"
+	"github.com/hashicorp/terraform/internal/backend/local"
 	"github.com/hashicorp/terraform/internal/command/arguments"
 	"github.com/hashicorp/terraform/internal/command/views"
 	"github.com/hashicorp/terraform/internal/tfdiags"
@@ -78,6 +79,18 @@ func (c *PlanCommand) Run(rawArgs []string) int {
 		return 1
 	}
 
+	if len(args.Operation.ActionTargets) > 0 {
+		if _, ok := be.(*local.Local); !ok {
+			// Temporarily block invoking actions when executing anything other
+			// than locally.
+			// TODO: Remove this when TFC supports remote operation of action
+			//       invoke plans.
+			diags = diags.Append(tfdiags.Sourceless(tfdiags.Error, "Invalid argument", "The -invoke argument can currently only be used when Terraform is executing locally."))
+			view.Diagnostics(diags)
+			return 1
+		}
+	}
+
 	// Build the operation request
 	opReq, opDiags := c.OperationRequest(be, view, args.ViewType, args.Operation, args.OutPath, args.GenerateConfigPath)
 	diags = diags.Append(opDiags)