vendor: github.com/moby/buildkit v0.21.0-rc1

Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>

vendor/github.com/moby/buildkit/exporter/containerimage/exptypes/keys.go

@@ -26,11 +26,17 @@ var (
 	// Value: bool <true|false>
 	OptKeyUnpack ImageExporterOptKey = "unpack"
 
-	// Fallback image name prefix if image name isn't provided.
-	// If used, image will be named as <value>@<digest>
+	// Image name prefix to be used for tagging a dangling image.
+	// If used, image will be named as <value>@<digest> in addition
+	// to any other specified names.
 	// Value: string
 	OptKeyDanglingPrefix ImageExporterOptKey = "dangling-name-prefix"
 
+	// Only use the dangling image name as a fallback if image name isn't provided.
+	// Ignored if dangling-name-prefix is not set.
+	// Value: bool <true|false>
+	OptKeyDanglingEmptyOnly ImageExporterOptKey = "danging-name-empty-only"
+
 	// Creates additional image name with format <name>@<digest>
 	// Value: bool <true|false>
 	OptKeyNameCanonical ImageExporterOptKey = "name-canonical"

vendor/github.com/moby/buildkit/exporter/containerimage/exptypes/parse.go

@@ -32,7 +32,7 @@ func ParsePlatforms(meta map[string][]byte) (Platforms, error) {
 		return ps, nil
 	}
 
-	p := platforms.DefaultSpec()
+	var p ocispecs.Platform
 	if imgConfig, ok := meta[ExporterImageConfigKey]; ok {
 		var img ocispecs.Image
 		err := json.Unmarshal(imgConfig, &img)
@@ -51,6 +51,8 @@ func ParsePlatforms(meta map[string][]byte) (Platforms, error) {
 		} else if img.OS != "" || img.Architecture != "" {
 			return Platforms{}, errors.Errorf("invalid image config: os and architecture must be specified together")
 		}
+	} else {
+		p = platforms.DefaultSpec()
 	}
 	p = platforms.Normalize(p)
 	pk := platforms.FormatAll(p)

vendor/github.com/moby/buildkit/exporter/containerimage/exptypes/types.go

@@ -9,6 +9,7 @@ import (
 
 const (
 	ExporterConfigDigestKey      = "config.digest"
+	ExporterImageNameKey         = "image.name"
 	ExporterImageDigestKey       = "containerimage.digest"
 	ExporterImageConfigKey       = "containerimage.config"
 	ExporterImageConfigDigestKey = "containerimage.config.digest"