Merge pull request #778 from giuseppe/copier-accept-compression

libimage: accept CompressionFormat/CompressionLevel

libimage/copier.go

@@ -12,6 +12,7 @@ import (
 	"github.com/containers/common/pkg/retry"
 	"github.com/containers/image/v5/copy"
 	"github.com/containers/image/v5/docker/reference"
+	"github.com/containers/image/v5/pkg/compression"
 	"github.com/containers/image/v5/signature"
 	storageTransport "github.com/containers/image/v5/storage"
 	"github.com/containers/image/v5/types"
@@ -40,6 +41,10 @@ type CopyOptions struct {
 	// Allows for customizing the destination reference lookup.  This can
 	// be used to use custom blob caches.
 	DestinationLookupReferenceFunc LookupReferenceFunc
+	// CompressionFormat is the format to use for the compression of the blobs
+	CompressionFormat *compression.Algorithm
+	// CompressionLevel specifies what compression level is used
+	CompressionLevel *int
 
 	// containers-auth.json(5) file to use when authenticating against
 	// container registries.
@@ -242,6 +247,14 @@ func (r *Runtime) newCopier(options *CopyOptions) (*copier, error) {
 		c.systemContext.DockerCertPath = options.CertDirPath
 	}
 
+	if options.CompressionFormat != nil {
+		c.systemContext.CompressionFormat = options.CompressionFormat
+	}
+
+	if options.CompressionLevel != nil {
+		c.systemContext.CompressionLevel = options.CompressionLevel
+	}
+
 	policy, err := signature.DefaultPolicy(c.systemContext)
 	if err != nil {
 		return nil, err