B fix ssm patching manager to set computed value as new

.changelog/35606.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+resource/aws_ssm_patch_baseline: Mark `json` as Computed if there are content changes
+```

internal/service/ssm/default_patch_baseline.go

@@ -33,8 +33,8 @@ const (
 	patchBaselineIDRegexPattern = `pb-[0-9a-f]{17}`
 )
 
-// @SDKResource("aws_ssm_default_patch_baseline")
-func ResourceDefaultPatchBaseline() *schema.Resource {
+// @SDKResource("aws_ssm_default_patch_baseline", name="Default Patch Baseline")
+func resourceDefaultPatchBaseline() *schema.Resource {
 	return &schema.Resource{
 		CreateWithoutTimeout: resourceDefaultPatchBaselineCreate,
 		ReadWithoutTimeout:   resourceDefaultPatchBaselineRead,
@@ -47,7 +47,7 @@ func ResourceDefaultPatchBaseline() *schema.Resource {
 				if isPatchBaselineID(id) || isPatchBaselineARN(id) {
 					conn := meta.(*conns.AWSClient).SSMClient(ctx)
 
-					patchbaseline, err := findPatchBaselineByID(ctx, conn, id)
+					patchbaseline, err := findPatchBaselineByIDV2(ctx, conn, id)
 					if err != nil {
 						return nil, fmt.Errorf("reading SSM Patch Baseline (%s): %w", id, err)
 					}
@@ -171,17 +171,16 @@ const (
 
 func resourceDefaultPatchBaselineCreate(ctx context.Context, d *schema.ResourceData, meta any) diag.Diagnostics {
 	var diags diag.Diagnostics
-
 	conn := meta.(*conns.AWSClient).SSMClient(ctx)
 
 	baselineID := d.Get("baseline_id").(string)
 
-	patchBaseline, err := findPatchBaselineByID(ctx, conn, baselineID)
+	patchBaseline, err := findPatchBaselineByIDV2(ctx, conn, baselineID)
+
 	if err != nil {
-		return create.AppendDiagErrorMessage(diags, names.SSM, "registering", ResNameDefaultPatchBaseline, baselineID,
-			create.ProblemStandardMessage(names.SSM, create.ErrActionReading, resNamePatchBaseline, baselineID, err),
-		)
+		return sdkdiag.AppendErrorf(diags, "reading SSM Patch Baseline (%s): %s", baselineID, err)
 	}
+
 	if pbOS, cOS := string(patchBaseline.OperatingSystem), d.Get("operating_system"); pbOS != cOS {
 		return create.AppendDiagErrorMessage(diags, names.SSM, "registering", ResNameDefaultPatchBaseline, baselineID,
 			fmt.Sprintf("Patch Baseline Operating System (%s) does not match %s", pbOS, cOS),
@@ -304,28 +303,29 @@ func FindDefaultPatchBaseline(ctx context.Context, conn *ssm.Client, os types.Op
 	return out, nil
 }
 
-func findPatchBaselineByID(ctx context.Context, conn *ssm.Client, id string) (*ssm.GetPatchBaselineOutput, error) {
-	in := &ssm.GetPatchBaselineInput{
+func findPatchBaselineByIDV2(ctx context.Context, conn *ssm.Client, id string) (*ssm.GetPatchBaselineOutput, error) {
+	input := &ssm.GetPatchBaselineInput{
 		BaselineId: aws.String(id),
 	}
-	out, err := conn.GetPatchBaseline(ctx, in)
+
+	output, err := conn.GetPatchBaseline(ctx, input)
 
 	if errs.IsA[*types.DoesNotExistException](err) {
 		return nil, &retry.NotFoundError{
 			LastError:   err,
-			LastRequest: in,
+			LastRequest: input,
 		}
 	}
 
 	if err != nil {
 		return nil, err
 	}
 
-	if out == nil {
-		return nil, tfresource.NewEmptyResultError(in)
+	if output == nil {
+		return nil, tfresource.NewEmptyResultError(input)
 	}
 
-	return out, nil
+	return output, nil
 }
 
 func patchBaselinesPaginator(conn *ssm.Client, filters ...types.PatchOrchestratorFilter) *ssm.DescribePatchBaselinesPaginator {

internal/service/ssm/exports_test.go

@@ -0,0 +1,12 @@
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
+package ssm
+
+// Exports for use in tests only.
+var (
+	ResourceDefaultPatchBaseline = resourceDefaultPatchBaseline
+	ResourcePatchBaseline        = resourcePatchBaseline
+
+	FindPatchBaselineByID = findPatchBaselineByID
+)