Merge pull request #36719 from hashicorp/jbardin/zero-instance-ephem

make sure ephemeral nodes with zero instances work

Author: jbardin

.changes/v1.11/BUG FIXES-20250319-091234.yaml

@@ -0,0 +1,5 @@
+kind: BUG FIXES
+body: Modules with zero instances that contain ephemeral resources could produce an error during apply
+time: 2025-03-19T09:12:34.565564-04:00
+custom:
+    Issue: "36719"

internal/terraform/context_apply_ephemeral_test.go

@@ -142,6 +142,13 @@ provider "test" {
 
 resource "test_object" "test" {
 }
+
+# make sure ephemerals with zero instances are processed correctly too
+module "zero" {
+  count = 0
+  source = "./mod"
+  input = "test"
+}
 `,
 		"./mod/main.tf": `
 variable input {
@@ -154,6 +161,7 @@ output "data" {
   ephemeral = true
   value = ephemeral.ephem_resource.data.value
 }
+
 `,
 	})
 

internal/terraform/node_resource_apply.go

@@ -84,6 +84,8 @@ func (n *nodeExpandApplyableResource) dynamicExpandEphemeral(ctx EvalContext) (*
 		diags = diags.Append(expDiags)
 	}
 
+	addRootNodeToGraph(&g)
+
 	return &g, diags
 }