From dc0eba33afd2927c1de26bc551d85c7382e6e721 Mon Sep 17 00:00:00 2001
From: Kevin Vu <vietcgi@gmail.com>
Date: Wed, 19 Nov 2025 00:51:09 -0800
Subject: [PATCH] fix: support ephemeral resources in jsonchecks (#37893)

Fixes #37834
---
 .changes/v1.15/BUG FIXES-20251112-033830.yaml |  5 ++
 internal/command/jsonchecks/checks_test.go    | 52 +++++++++++++++++++
 internal/command/jsonchecks/objects.go        |  2 +
 3 files changed, 59 insertions(+)
 create mode 100644 .changes/v1.15/BUG FIXES-20251112-033830.yaml

diff --git a/.changes/v1.15/BUG FIXES-20251112-033830.yaml b/.changes/v1.15/BUG FIXES-20251112-033830.yaml
new file mode 100644
index 0000000000..1cafafd43a
--- /dev/null
+++ b/.changes/v1.15/BUG FIXES-20251112-033830.yaml	
@@ -0,0 +1,5 @@
+kind: BUG FIXES
+body: 'cli: Fixed crash in `terraform show -json` when plan contains ephemeral resources with preconditions or postconditions'
+time: 2025-11-12T03:38:30.000000-08:00
+custom:
+    Issue: "37834"
diff --git a/internal/command/jsonchecks/checks_test.go b/internal/command/jsonchecks/checks_test.go
index 4b631801ca..b4754874d2 100644
--- a/internal/command/jsonchecks/checks_test.go
+++ b/internal/command/jsonchecks/checks_test.go
@@ -41,6 +41,16 @@ func TestMarshalCheckStates(t *testing.T) {
 	outputBInstAddr := addrs.Checkable(addrs.OutputValue{Name: "b"}.Absolute(moduleChildAddr))
 	checkBlockAAddr := addrs.ConfigCheckable(addrs.Check{Name: "a"}.InModule(addrs.RootModule))
 	checkBlockAInstAddr := addrs.Checkable(addrs.Check{Name: "a"}.Absolute(addrs.RootModuleInstance))
+	ephemeralResourceAddr := addrs.ConfigCheckable(addrs.Resource{
+		Mode: addrs.EphemeralResourceMode,
+		Type: "test",
+		Name: "ephemeral",
+	}.InModule(addrs.RootModule))
+	ephemeralResourceInstAddr := addrs.Checkable(addrs.Resource{
+		Mode: addrs.EphemeralResourceMode,
+		Type: "test",
+		Name: "ephemeral",
+	}.Instance(addrs.NoKey).Absolute(addrs.RootModuleInstance))
 
 	tests := map[string]struct {
 		Input *states.CheckResults
@@ -223,6 +233,48 @@ func TestMarshalCheckStates(t *testing.T) {
 				},
 			},
 		},
+		"ephemeral_resource": {
+			&states.CheckResults{
+				ConfigResults: addrs.MakeMap(
+					addrs.MakeMapElem(ephemeralResourceAddr, &states.CheckResultAggregate{
+						Status: checks.StatusFail,
+						ObjectResults: addrs.MakeMap(
+							addrs.MakeMapElem(ephemeralResourceInstAddr, &states.CheckResultObject{
+								Status: checks.StatusFail,
+								FailureMessages: []string{
+									"Ephemeral resource check failed.",
+								},
+							}),
+						),
+					}),
+				),
+			},
+			[]any{
+				map[string]any{
+					"address": map[string]any{
+						"kind":       "resource",
+						"mode":       "ephemeral",
+						"name":       "ephemeral",
+						"to_display": "ephemeral.test.ephemeral",
+						"type":       "test",
+					},
+					"instances": []any{
+						map[string]any{
+							"address": map[string]any{
+								"to_display": "ephemeral.test.ephemeral",
+							},
+							"problems": []any{
+								map[string]any{
+									"message": "Ephemeral resource check failed.",
+								},
+							},
+							"status": "fail",
+						},
+					},
+					"status": "fail",
+				},
+			},
+		},
 	}
 
 	for name, test := range tests {
diff --git a/internal/command/jsonchecks/objects.go b/internal/command/jsonchecks/objects.go
index b2a0c94e12..61a868f0d0 100644
--- a/internal/command/jsonchecks/objects.go
+++ b/internal/command/jsonchecks/objects.go
@@ -29,6 +29,8 @@ func makeStaticObjectAddr(addr addrs.ConfigCheckable) staticObjectAddr {
 			ret["mode"] = "managed"
 		case addrs.DataResourceMode:
 			ret["mode"] = "data"
+		case addrs.EphemeralResourceMode:
+			ret["mode"] = "ephemeral"
 		default:
 			panic(fmt.Sprintf("unsupported resource mode %#v", addr.Resource.Mode))
 		}