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images, remotes: add support for foreign layers

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Add support for downloading layers with external URLs and
foreign/non-distributable mediatypes. This ensures that encountered
windows images are downloaded correctly. We still need to filter out the
extra windows resources when pulling linux, but this is a step towards
correctly supporting multi-platform images.

Signed-off-by: Stephen J Day <stephen.day@docker.com>
This commit is contained in:
Stephen J Day
2017-09-20 17:06:13 -07:00
parent 9934acb271
commit 13771fba83
4 changed files with 28 additions and 14 deletions
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1
remotes/handlers.go
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@@ -27,6 +27,7 @@ func MakeRefKey(ctx context.Context, desc ocispec.Descriptor) string {
case images.MediaTypeDockerSchema2ManifestList, ocispec.MediaTypeImageIndex:
return "index-" + desc.Digest.String()
case images.MediaTypeDockerSchema2Layer, images.MediaTypeDockerSchema2LayerGzip,
images.MediaTypeDockerSchema2LayerForeign, images.MediaTypeDockerSchema2LayerForeignGzip,
ocispec.MediaTypeImageLayer, ocispec.MediaTypeImageLayerGzip,
ocispec.MediaTypeImageLayerNonDistributable, ocispec.MediaTypeImageLayerNonDistributableGzip:
return "layer-" + desc.Digest.String()