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estargz.go
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estargz.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package oci
import (
"context"
"github.com/containerd/stargz-snapshotter/estargz"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/empty"
"github.com/google/go-containerregistry/pkg/v1/mutate"
"github.com/google/go-containerregistry/pkg/v1/tarball"
"namespacelabs.dev/foundation/internal/compute"
"namespacelabs.dev/foundation/internal/executor"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/std/tasks"
)
type convertToEstargz struct {
resolvable compute.Computable[ResolvableImage]
compute.LocalScoped[ResolvableImage]
}
var _ compute.Computable[ResolvableImage] = &convertToEstargz{}
func (c *convertToEstargz) Action() *tasks.ActionEvent {
return tasks.Action("oci.convert-to-estargz")
}
func (c *convertToEstargz) Inputs() *compute.In {
return compute.Inputs().Computable("resolvable", c.resolvable)
}
func (c *convertToEstargz) Compute(ctx context.Context, r compute.Resolved) (ResolvableImage, error) {
resolved := compute.MustGetDepValue(r, c.resolvable, "resolvable")
switch raw := resolved.(type) {
case rawImage:
newImage, err := convertImageToEstargz(ctx, raw.image)
if err != nil {
return nil, err
}
return rawImage{newImage}, nil
case rawImageIndex:
newIndex, err := convertIndexToEstargz(ctx, raw.index)
if err != nil {
return nil, err
}
return rawImageIndex{newIndex}, nil
default:
return nil, fnerrors.InternalError("unknown ResolvedImage type")
}
}
func convertImageToEstargz(ctx context.Context, img Image) (Image, error) {
cf, err := img.ConfigFile()
if err != nil {
return nil, err
}
ocfg := cf.DeepCopy()
ocfg.History = nil
ocfg.RootFS.DiffIDs = nil
base, err := mutate.ConfigFile(empty.Image, ocfg)
if err != nil {
return nil, err
}
d, err := img.Manifest()
if err != nil {
return nil, err
}
eg := executor.New(ctx, "convert-image-to-estargz")
layers := make([]v1.Layer, len(d.Layers))
for k := range d.Layers {
k := k // Capture k.
eg.Go(func(ctx context.Context) error {
layer := d.Layers[k]
l, err := img.LayerByDigest(layer.Digest)
if err != nil {
return err
}
if layer.Annotations[estargz.TOCJSONDigestAnnotation] != "" {
layers[k] = l
return nil
} else {
layers[k], err = transformLayer(l)
return err
}
})
}
if err := eg.Wait(); err != nil {
return nil, err
}
return mutate.AppendLayers(base, layers...)
}
func convertIndexToEstargz(ctx context.Context, index ImageIndex) (ImageIndex, error) {
m, err := index.IndexManifest()
if err != nil {
return nil, err
}
eg := executor.New(ctx, "convert-index-to-estargz")
images := make([]mutate.IndexAddendum, len(m.Manifests))
for k := range m.Manifests {
k := k // Capture k.
eg.Go(func(ctx context.Context) error {
desc := m.Manifests[k]
img, err := index.Image(desc.Digest)
if err != nil {
return err
}
transformed, err := convertImageToEstargz(ctx, img)
if err != nil {
return err
}
images[k] = mutate.IndexAddendum{
Add: transformed,
Descriptor: v1.Descriptor{
MediaType: desc.MediaType,
URLs: desc.URLs,
Platform: desc.Platform,
Annotations: desc.Annotations,
},
}
return err
})
}
if err := eg.Wait(); err != nil {
return nil, err
}
return mutate.AppendManifests(empty.Index, images...), nil
}
func transformLayer(layer v1.Layer) (v1.Layer, error) {
return tarball.LayerFromOpener(layer.Uncompressed, tarball.WithEstargz, tarball.WithEstargzOptions(estargz.WithCompressionLevel(6)))
}