Fix platform in ExtractImage (#737)

We were passing the platform but doing nothing with it. Thats bad.
This will now check if the platform is valid by trying to parse it and
if it fails or platform is empty, it will default to the current
platform as it did before

Signed-off-by: Itxaka <itxaka@kairos.io>

pkg/types/v1/image.go

@@ -17,6 +17,7 @@ limitations under the License.
 package v1
 
 import (
+	v1 "github.com/google/go-containerregistry/pkg/v1"
 	"github.com/kairos-io/kairos-sdk/utils"
 )
 
@@ -30,7 +31,19 @@ type OCIImageExtractor struct{}
 var _ ImageExtractor = OCIImageExtractor{}
 
 func (e OCIImageExtractor) ExtractImage(imageRef, destination, platformRef string) error {
-	img, err := utils.GetImage(imageRef, utils.GetCurrentPlatform(), nil, nil)
+	// If we pass a platform
+	if platformRef != "" {
+		// make sure its correct
+		_, err := v1.ParsePlatform(platformRef)
+		if err != nil {
+			// and if we cannot properly parse it, then default to the current platform
+			platformRef = utils.GetCurrentPlatform()
+		}
+	} else {
+		// if we don't pass a platform, then default to the current platform
+		platformRef = utils.GetCurrentPlatform()
+	}
+	img, err := utils.GetImage(imageRef, platformRef, nil, nil)
 	if err != nil {
 		return err
 	}