exporter/image/exptypes: Make strongly typed

Signed-off-by: Paweł Gronowski <[email protected]>

control/control.go

@@ -332,11 +332,11 @@ func (c *Controller) Solve(ctx context.Context, req *controlapi.SolveRequest) (*
 
 	// if SOURCE_DATE_EPOCH is set, enable it for the exporter
 	if v, ok := epoch.ParseBuildArgs(req.FrontendAttrs); ok {
-		if _, ok := req.ExporterAttrs[exptypes.OptKeySourceDateEpoch]; !ok {
+		if _, ok := req.ExporterAttrs[string(exptypes.OptKeySourceDateEpoch)]; !ok {
 			if req.ExporterAttrs == nil {
 				req.ExporterAttrs = make(map[string]string)
 			}
-			req.ExporterAttrs[exptypes.OptKeySourceDateEpoch] = v
+			req.ExporterAttrs[string(exptypes.OptKeySourceDateEpoch)] = v
 		}
 	}
 

exporter/containerimage/export.go

@@ -79,7 +79,7 @@ func (e *imageExporter) Resolve(ctx context.Context, opt map[string]string) (exp
 	}
 
 	for k, v := range opt {
-		switch k {
+		switch exptypes.ImageExporterOptKey(k) {
 		case exptypes.OptKeyPush:
 			if v == "" {
 				i.push = true

exporter/containerimage/exptypes/keys.go

@@ -1,71 +1,73 @@
 package exptypes
 
+type ImageExporterOptKey string
+
 // Options keys supported by the image exporter output.
 var (
 	// Name of the image.
 	// Value: string
-	OptKeyName = "name"
+	OptKeyName ImageExporterOptKey = "name"
 
 	// Push after creating image.
 	// Value: bool <true|false>
-	OptKeyPush = "push"
+	OptKeyPush ImageExporterOptKey = "push"
 
 	// Push unnamed image.
 	// Value: bool <true|false>
-	OptKeyPushByDigest = "push-by-digest"
+	OptKeyPushByDigest ImageExporterOptKey = "push-by-digest"
 
 	// Allow pushing to insecure HTTP registry.
 	// Value: bool <true|false>
-	OptKeyInsecure = "registry.insecure"
+	OptKeyInsecure ImageExporterOptKey = "registry.insecure"
 
 	// Unpack image after it's created (containerd).
 	// Value: bool <true|false>
-	OptKeyUnpack = "unpack"
+	OptKeyUnpack ImageExporterOptKey = "unpack"
 
 	// Fallback image name prefix if image name isn't provided.
 	// If used, image will be named as <value>@<digest>
 	// Value: string
-	OptKeyDanglingPrefix = "dangling-name-prefix"
+	OptKeyDanglingPrefix ImageExporterOptKey = "dangling-name-prefix"
 
 	// Creates additional image name with format <name>@<digest>
 	// Value: bool <true|false>
-	OptKeyNameCanonical = "name-canonical"
+	OptKeyNameCanonical ImageExporterOptKey = "name-canonical"
 
 	// Store the resulting image along with all of the content it references.
 	// Ignored if the worker doesn't have image store (e.g. OCI worker).
 	// Value: bool <true|false>
-	OptKeyStore = "store"
+	OptKeyStore ImageExporterOptKey = "store"
 
 	// Use OCI mediatypes instead of Docker in JSON configs.
 	// Value: bool <true|false>
-	OptKeyOCITypes = "oci-mediatypes"
+	OptKeyOCITypes ImageExporterOptKey = "oci-mediatypes"
 
 	// Force attestation to be attached.
 	// Value: bool <true|false>
-	OptKeyForceInlineAttestations = "attestation-inline"
+	OptKeyForceInlineAttestations ImageExporterOptKey = "attestation-inline"
 
 	// Mark layers as non-distributable if they are found to use a
 	// non-distributable media type. When this option is not set, the exporter
 	// will change the media type of the layer to a distributable one.
 	// Value: bool <true|false>
-	OptKeyPreferNondistLayers = "prefer-nondist-layers"
+	OptKeyPreferNondistLayers ImageExporterOptKey = "prefer-nondist-layers"
 
 	// Clamp produced timestamps. For more information see the
 	// SOURCE_DATE_EPOCH specification.
 	// Value: int (number of seconds since Unix epoch)
-	OptKeySourceDateEpoch = "source-date-epoch"
+	OptKeySourceDateEpoch ImageExporterOptKey = "source-date-epoch"
 
 	// Compression type for newly created and cached layers.
 	// estargz should be used with OptKeyOCITypes set to true.
 	// Value: string <uncompressed|gzip|estargz|zstd>
-	OptKeyLayerCompression = "compression"
+	OptKeyLayerCompression ImageExporterOptKey = "compression"
 
 	// Force compression on all (including existing) layers.
 	// Value: bool <true|false>
-	OptKeyForceCompression = "force-compression"
+	OptKeyForceCompression ImageExporterOptKey = "force-compression"
 
 	// Compression level
 	// Value: int (0-9) for gzip and estargz
 	// Value: int (0-22) for zstd
-	OptKeyCompressionLevel = "compression-level"
+	OptKeyCompressionLevel ImageExporterOptKey = "compression-level"
 )

exporter/containerimage/opts.go

@@ -43,7 +43,7 @@ func (c *ImageCommitOpts) Load(ctx context.Context, opt map[string]string) (map[
 
 	for k, v := range opt {
 		var err error
-		switch k {
+		switch exptypes.ImageExporterOptKey(k) {
 		case exptypes.OptKeyName:
 			c.ImageName = v
 		case exptypes.OptKeyOCITypes:

exporter/util/epoch/parse.go

@@ -25,7 +25,7 @@ func ParseExporterAttrs(opt map[string]string) (*time.Time, map[string]string, e
 
 	for k, v := range opt {
 		switch k {
-		case exptypes.OptKeySourceDateEpoch:
+		case string(exptypes.OptKeySourceDateEpoch):
 			var err error
 			tm, err = parseTime(k, v)
 			if err != nil {