copy: add EnsureCompressionVariantExist for instanceCopyClone

* copy.Options now contains a new field `EnsureCompressionVariantExists map[string]int` which allows users to specify if they want to clone images with specified `compression`. Signed-off-by: Aditya R <[email protected]>
containers · Jul 26, 2023 · 9f13c15 · 9f13c15
1 parent 15f52eb
commit 9f13c15
Showing 1 changed file with 16 additions and 0 deletions.
diff --git a/copy/copy.go b/copy/copy.go
@@ -17,6 +17,7 @@ import (
  "github.com/containers/image/v5/internal/private"
  "github.com/containers/image/v5/manifest"
  "github.com/containers/image/v5/pkg/blobinfocache"
+ compression "github.com/containers/image/v5/pkg/compression/types"
  "github.com/containers/image/v5/signature"
  "github.com/containers/image/v5/signature/signer"
  "github.com/containers/image/v5/transports"
@@ -126,6 +127,21 @@ type Options struct {
  // Download layer contents with "nondistributable" media types ("foreign" layers) and translate the layer media type
  // to not indicate "nondistributable".
  DownloadForeignLayers bool
+
+ // Contains slice of OptionCompressionVariant, where copy will ensure that for each platform
+ // in the manifest list, a variant with the requested compression will exist.
+ // Invalid when copying a non-multi-architecture image. That will probably
+ // change in the future.
+ EnsureCompressionVariantsExist []OptionCompressionVariant
+}
+
+// OptionCompressionVariant allows to supply information about
+// selected compression algorithm and compression level by the
+// end-user. Refer to EnsureCompressionVariantsExist to know
+// more about its usage.
+type OptionCompressionVariant struct {
+ Algorithm compression.Algorithm
+ Level *int // Only used when we are creating a new image instance using the specified algorithm, not when the image already contains such an instance
 }
 
 // copier allows us to keep track of diffID values for blobs, and other