also check against action references in depends_on during config parsing

internal/configs/config_test.go

@@ -581,3 +581,19 @@ func TestConfigImportProviderWithNoResourceProvider(t *testing.T) {
 Use the provider argument in the target resource block to configure the provider for a resource with explicit provider configuration.`,
 	})
 }
+
+func TestConfigActionInResourceDependsOn(t *testing.T) {
+	src, err := os.ReadFile("testdata/invalid-modules/action-in-depends_on/action-in-resource-depends_on.tf")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	parser := testParser(map[string]string{
+		"main.tf": string(src),
+	})
+
+	_, diags := parser.LoadConfigFile("main.tf")
+	assertExactDiagnostics(t, diags, []string{
+		`main.tf:5,17-42: Invalid depends_on Action Reference; The depends_on attribute cannot reference action blocks directly. You must reference a resource or data source instead.`,
+	})
+}

internal/configs/depends_on.go

@@ -17,8 +17,18 @@ func DecodeDependsOn(attr *hcl.Attribute) ([]hcl.Traversal, hcl.Diagnostics) {
 
 		traversal, travDiags := hcl.AbsTraversalForExpr(expr)
 		diags = append(diags, travDiags...)
+
 		if len(traversal) != 0 {
-			ret = append(ret, traversal)
+			if traversal.RootName() == "action" {
+				diags = append(diags, &hcl.Diagnostic{
+					Severity: hcl.DiagError,
+					Summary:  "Invalid depends_on Action Reference",
+					Detail:   "The depends_on attribute cannot reference action blocks directly. You must reference a resource or data source instead.",
+					Subject:  expr.Range().Ptr(),
+				})
+			} else {
+				ret = append(ret, traversal)
+			}
 		}
 	}
 

internal/configs/testdata/invalid-modules/action-in-depends_on/action-in-resource-depends_on.tf

@@ -0,0 +1,11 @@
+action "aws_action" "example" {
+}
+
+resource "aws_instance" "web" {
+  depends_on = [action.aws_action.example]
+  ami        = "ami-1234"
+  security_groups = [
+    "foo",
+    "bar",
+  ]
+}

internal/terraform/context_plan_actions_test.go

@@ -319,75 +319,6 @@ output "my_output2" {
 				},
 			},
 
-			"actions can't be used in depends_on": {
-				module: map[string]string{
-					"main.tf": `
-action "test_action" "my_action" {
-  config {
-    attr = "value"
-  }
-}
-resource "test_object" "a" {
-  depends_on = [action.test_action.my_action]
-  lifecycle {
-    action_trigger {
-      events = [before_create]
-      actions = [action.test_action.my_action]
-    }
-  }
-}
-`,
-				},
-				expectValidateDiagnostics: func(m *configs.Config) tfdiags.Diagnostics {
-					return tfdiags.Diagnostics{}.Append(
-						&hcl.Diagnostic{
-							Severity: hcl.DiagError,
-							Summary:  "Invalid depends_on reference",
-							Detail:   "Actions can not be referenced in depends_on. Use depends_on on the resource that triggers the action instead.",
-							Subject: &hcl.Range{
-								Filename: filepath.Join(m.Module.SourceDir, "main.tf"),
-								Start:    hcl.Pos{Line: 8, Column: 17, Byte: 117},
-								End:      hcl.Pos{Line: 8, Column: 45, Byte: 145},
-							},
-						})
-				},
-			},
-
-			"action instances can't be used in depends_on": {
-				module: map[string]string{
-					"main.tf": `
-action "test_action" "my_action" {
-  count = 3
-  config {
-    attr = "value"
-  }
-}
-resource "test_object" "a" {
-  depends_on = [action.test_action.my_action[1]]
-  lifecycle {
-    action_trigger {
-      events = [before_create]
-      actions = [action.test_action.my_action[1]]
-    }
-  }
-}
-`,
-				},
-				expectValidateDiagnostics: func(m *configs.Config) tfdiags.Diagnostics {
-					return tfdiags.Diagnostics{}.Append(
-						&hcl.Diagnostic{
-							Severity: hcl.DiagError,
-							Summary:  "Invalid depends_on reference",
-							Detail:   "Actions can not be referenced in depends_on. Use depends_on on the resource that triggers the action instead.",
-							Subject: &hcl.Range{
-								Filename: filepath.Join(m.Module.SourceDir, "main.tf"),
-								Start:    hcl.Pos{Line: 9, Column: 17, Byte: 129},
-								End:      hcl.Pos{Line: 9, Column: 48, Byte: 160},
-							},
-						})
-				},
-			},
-
 			"destroy run": {
 				module: map[string]string{
 					"main.tf": `