added log message if image is considered not buildable

provider/internal/image.go

@@ -68,7 +68,8 @@ type Image struct {
 
 // Annotate provides a description of the Image resource.
 func (i *Image) Annotate(a infer.Annotator) {
-	a.Describe(&i, dedent(`
+	a.Describe(
+		&i, dedent(`
 		A Docker image built using buildx -- Docker's interface to the improved
 		BuildKit backend.
 
@@ -79,8 +80,8 @@ func (i *Image) Annotate(a infer.Annotator) {
 		We will strive to keep APIs and behavior as stable as possible, but we
 		cannot guarantee stability until version 1.0.
 	`)+
-		"\n\n"+_migration+
+			"\n\n"+_migration+
-		"\n\n"+_imageExamples,
+			"\n\n"+_imageExamples,
 	)
 }
 
@@ -302,7 +303,8 @@ type ImageState struct {
 func (is *ImageState) Annotate(a infer.Annotator) {
 	is.ImageArgs.Annotate(a)
 
-	a.Describe(&is.Digest, dedent(`
+	a.Describe(&is.Digest, dedent(
+		`
 		A SHA256 digest of the image if it was exported to a registry or
 		elsewhere.
 
@@ -434,7 +436,13 @@ func (ia *ImageArgs) normalize(preview bool) ImageArgs {
 func (ia *ImageArgs) buildable() bool {
 	// We can build the given inputs if filtering unknowns is a no-op.
 	filtered := ia.normalize(true)
-	return reflect.DeepEqual(ia, &filtered)
+	equal := reflect.DeepEqual(ia, &filtered)
+
+	if !equal {
+		fmt.Printf("Not buildable:\n\tArgs => %v\n\tNormalize => %v", ia, &filtered)
+	}
+
+	return equal
 }
 
 // isExported returns true if the args include a registry export.
@@ -499,13 +507,15 @@ func (ia ImageArgs) toBuild(
 	if len(ia.Exports) == 0 && !ia.Push && !ia.Load {
 		provider.GetLogger(ctx).Warning(
 			"No exports were specified so the build will only remain in the local build cache. " +
-				"Use `push` to upload the image to a registry, or silence this warning with a `cacheonly` export.")
+				"Use `push` to upload the image to a registry, or silence this warning with a `cacheonly` export.",
+		)
 	}
 
 	if len(opts.Platforms) > 1 && len(opts.CacheTo) > 0 {
 		provider.GetLogger(ctx).Warning(
 			"Caching doesn't work reliably with multi-platform builds (https://github.com/docker/buildx/discussions/1382). " +
-				"Instead, perform one cached build per platform and create an Index to join them all together.")
+				"Instead, perform one cached build per platform and create an Index to join them all together.",
+		)
 	}
 
 	return &build{
@@ -523,7 +533,8 @@ func (ia *ImageArgs) validate(supportsMultipleExports, preview bool) (controller
 
 	if !supportsMultipleExports {
 		if len(ia.Exports) > 1 {
-			multierr = errors.Join(multierr,
+			multierr = errors.Join(
+				multierr,
 				newCheckFailure(errors.New("multiple exports require a v0.13 buildkit daemon or newer"), "exports"),
 			)
 		}
@@ -537,7 +548,8 @@ func (ia *ImageArgs) validate(supportsMultipleExports, preview bool) (controller
 			)
 		}
 		if len(ia.Exports) > 0 && (ia.Push || ia.Load) {
-			multierr = errors.Join(multierr,
+			multierr = errors.Join(
+				multierr,
 				newCheckFailure(errors.New("multiple exports require a v0.13 buildkit daemon or newer"), "exports"),
 			)
 		}
@@ -778,7 +790,8 @@ func (i *Image) Update(
 	ctx context.Context,
 	req infer.UpdateRequest[ImageArgs, ImageState],
 ) (infer.UpdateResponse[ImageState], error) {
-	resp, err := i.Create(ctx,
+	resp, err := i.Create(
+		ctx,
 		infer.CreateRequest[ImageArgs]{Name: req.ID, Inputs: req.Inputs, DryRun: req.DryRun},
 	)
 	return infer.UpdateResponse[ImageState]{Output: resp.Output}, err