containerimage: Export option keys

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>

control/control.go

@@ -20,6 +20,7 @@ import (
 	"github.com/moby/buildkit/cmd/buildkitd/config"
 	controlgateway "github.com/moby/buildkit/control/gateway"
 	"github.com/moby/buildkit/exporter"
+	"github.com/moby/buildkit/exporter/containerimage/exptypes"
 	"github.com/moby/buildkit/exporter/util/epoch"
 	"github.com/moby/buildkit/frontend"
 	"github.com/moby/buildkit/frontend/attestations"
@@ -331,11 +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[epoch.KeySourceDateEpoch]; !ok {
+		if _, ok := req.ExporterAttrs[exptypes.OptKeySourceDateEpoch]; !ok {
 			if req.ExporterAttrs == nil {
 				req.ExporterAttrs = make(map[string]string)
 			}
-			req.ExporterAttrs[epoch.KeySourceDateEpoch] = v
+			req.ExporterAttrs[exptypes.OptKeySourceDateEpoch] = v
 		}
 	}
 

exporter/containerimage/export.go

@@ -34,14 +34,6 @@ import (
 )
 
 const (
-	keyPush           = "push"
-	keyPushByDigest   = "push-by-digest"
-	keyInsecure       = "registry.insecure"
-	keyUnpack         = "unpack"
-	keyDanglingPrefix = "dangling-name-prefix"
-	keyNameCanonical  = "name-canonical"
-	keyStore          = "store"
-
 	// keyUnsafeInternalStoreAllowIncomplete should only be used for tests. This option allows exporting image to the image store
 	// as well as lacking some blobs in the content store. Some integration tests for lazyref behaviour depends on this option.
 	// Ignored when store=false.
@@ -88,7 +80,7 @@ func (e *imageExporter) Resolve(ctx context.Context, opt map[string]string) (exp
 
 	for k, v := range opt {
 		switch k {
-		case keyPush:
+		case exptypes.OptKeyPush:
 			if v == "" {
 				i.push = true
 				continue
@@ -98,7 +90,7 @@ func (e *imageExporter) Resolve(ctx context.Context, opt map[string]string) (exp
 				return nil, errors.Wrapf(err, "non-bool value specified for %s", k)
 			}
 			i.push = b
-		case keyPushByDigest:
+		case exptypes.OptKeyPushByDigest:
 			if v == "" {
 				i.pushByDigest = true
 				continue
@@ -108,7 +100,7 @@ func (e *imageExporter) Resolve(ctx context.Context, opt map[string]string) (exp
 				return nil, errors.Wrapf(err, "non-bool value specified for %s", k)
 			}
 			i.pushByDigest = b
-		case keyInsecure:
+		case exptypes.OptKeyInsecure:
 			if v == "" {
 				i.insecure = true
 				continue
@@ -118,7 +110,7 @@ func (e *imageExporter) Resolve(ctx context.Context, opt map[string]string) (exp
 				return nil, errors.Wrapf(err, "non-bool value specified for %s", k)
 			}
 			i.insecure = b
-		case keyUnpack:
+		case exptypes.OptKeyUnpack:
 			if v == "" {
 				i.unpack = true
 				continue
@@ -128,7 +120,7 @@ func (e *imageExporter) Resolve(ctx context.Context, opt map[string]string) (exp
 				return nil, errors.Wrapf(err, "non-bool value specified for %s", k)
 			}
 			i.unpack = b
-		case keyStore:
+		case exptypes.OptKeyStore:
 			if v == "" {
 				i.store = true
 				continue
@@ -148,9 +140,9 @@ func (e *imageExporter) Resolve(ctx context.Context, opt map[string]string) (exp
 				return nil, errors.Wrapf(err, "non-bool value specified for %s", k)
 			}
 			i.storeAllowIncomplete = b
-		case keyDanglingPrefix:
+		case exptypes.OptKeyDanglingPrefix:
 			i.danglingPrefix = v
-		case keyNameCanonical:
+		case exptypes.OptKeyNameCanonical:
 			if v == "" {
 				i.nameCanonical = true
 				continue

exporter/containerimage/exptypes/keys.go

@@ -0,0 +1,71 @@
+package exptypes
+
+// Options keys supported by the image exporter output.
+var (
+	// Name of the image.
+	// Value: string
+	OptKeyName = "name"
+
+	// Push after creating image.
+	// Value: bool <true|false>
+	OptKeyPush = "push"
+
+	// Push unnamed image.
+	// Value: bool <true|false>
+	OptKeyPushByDigest = "push-by-digest"
+
+	// Allow pushing to insecure HTTP registry.
+	// Value: bool <true|false>
+	OptKeyInsecure = "registry.insecure"
+
+	// Unpack image after it's created (containerd).
+	// Value: bool <true|false>
+	OptKeyUnpack = "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"
+
+	// Creates additional image name with format <name>@<digest>
+	// Value: bool <true|false>
+	OptKeyNameCanonical = "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"
+
+	// Use OCI mediatypes instead of Docker in JSON configs.
+	// Value: bool <true|false>
+	OptKeyOCITypes = "oci-mediatypes"
+
+	// Force attestation to be attached.
+	// Value: bool <true|false>
+	OptKeyForceInlineAttestations = "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"
+
+	// Clamp produced timestamps. For more information see the
+	// SOURCE_DATE_EPOCH specification.
+	// Value: int (number of seconds since Unix epoch)
+	OptKeySourceDateEpoch = "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"
+
+	// Force compression on all (including existing) layers.
+	// Value: bool <true|false>
+	OptKeyForceCompression = "force-compression"
+
+	// Compression level
+	// Value: int (0-9) for gzip and estargz
+	// Value: int (0-22) for zstd
+	OptKeyCompressionLevel = "compression-level"
+)

exporter/containerimage/opts.go

@@ -6,23 +6,13 @@ import (
 	"time"
 
 	cacheconfig "github.com/moby/buildkit/cache/config"
+	"github.com/moby/buildkit/exporter/containerimage/exptypes"
 	"github.com/moby/buildkit/exporter/util/epoch"
 	"github.com/moby/buildkit/util/bklog"
 	"github.com/moby/buildkit/util/compression"
 	"github.com/pkg/errors"
 )
 
-const (
-	keyImageName               = "name"
-	keyOCITypes                = "oci-mediatypes"
-	keyForceInlineAttestations = "attestation-inline"
-
-	// preferNondistLayersKey is an exporter option which can be used to mark a layer as non-distributable if the layer reference was
-	// already 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.
-	keyPreferNondistLayers = "prefer-nondist-layers"
-)
-
 type ImageCommitOpts struct {
 	ImageName   string
 	RefCfg      cacheconfig.RefConfig
@@ -54,13 +44,13 @@ func (c *ImageCommitOpts) Load(ctx context.Context, opt map[string]string) (map[
 	for k, v := range opt {
 		var err error
 		switch k {
-		case keyImageName:
+		case exptypes.OptKeyName:
 			c.ImageName = v
-		case keyOCITypes:
+		case exptypes.OptKeyOCITypes:
 			err = parseBoolWithDefault(&c.OCITypes, k, v, true)
-		case keyForceInlineAttestations:
+		case exptypes.OptKeyForceInlineAttestations:
 			err = parseBool(&c.ForceInlineAttestations, k, v)
-		case keyPreferNondistLayers:
+		case exptypes.OptKeyPreferNondistLayers:
 			err = parseBool(&c.RefCfg.PreferNonDistributable, k, v)
 		default:
 			rest[k] = v

exporter/util/epoch/parse.go

@@ -11,8 +11,6 @@ import (
 
 const (
 	frontendSourceDateEpochArg = "build-arg:SOURCE_DATE_EPOCH"
-
-	KeySourceDateEpoch = "source-date-epoch"
 )
 
 func ParseBuildArgs(opt map[string]string) (string, bool) {
@@ -27,7 +25,7 @@ func ParseExporterAttrs(opt map[string]string) (*time.Time, map[string]string, e
 
 	for k, v := range opt {
 		switch k {
-		case KeySourceDateEpoch:
+		case exptypes.OptKeySourceDateEpoch:
 			var err error
 			tm, err = parseTime(k, v)
 			if err != nil {