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Suzu1Dev wants to merge 3 commits into from
+335 −35
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Reuse cached OCI layers and configs #393

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92d69be
Reuse cached OCI layers before opening sources
Suzu1Dev Sep 22, 2026
c1116df
Reuse cached OCI configs during pull
Suzu1Dev Sep 23, 2026
a88ef3a
Tighten OCI platform mismatch assertions
Suzu1Dev Sep 23, 2026
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40 changes: 27 additions & 13 deletions cmd/oci/pull.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
package main

import (
"bytes"
"context"
"fmt"
"os"
Expand Down Expand Up @@ -43,8 +44,19 @@ func normalizeRef(ref string) (name.Reference, error) {
return name.ParseReference(ref, name.WeakValidation)
}

func imagePlatform(img v1.Image) (v1.Platform, error) {
config, err := img.ConfigFile()
func imagePlatform(ctx context.Context, s *store, img v1.Image) (v1.Platform, error) {
manifest, err := img.Manifest()
if err != nil {
return v1.Platform{}, err
}
raw, err := s.verifiedBlobBytes(ctx, manifest.Config)
if os.IsNotExist(err) {
raw, err = img.RawConfigFile()
}
if err != nil {
return v1.Platform{}, err
}
config, err := v1.ParseConfigFile(bytes.NewReader(raw))
if err != nil {
return v1.Platform{}, err
}
Expand All @@ -55,15 +67,15 @@ func imagePlatform(img v1.Image) (v1.Platform, error) {
}, nil
}

func indexChildImage(index v1.ImageIndex, child v1.Descriptor) (v1.Image, v1.Platform, error) {
func indexChildImage(ctx context.Context, s *store, index v1.ImageIndex, child v1.Descriptor) (v1.Image, v1.Platform, error) {
if !child.MediaType.IsImage() {
return nil, v1.Platform{}, fmt.Errorf("unexpected index child media type %s", child.MediaType)
}
img, err := index.Image(child.Digest)
if err != nil {
return nil, v1.Platform{}, err
}
actual, err := imagePlatform(img)
actual, err := imagePlatform(ctx, s, img)
return img, actual, err
}

Expand All @@ -82,7 +94,7 @@ func imagePlatformMatches(actual, requested v1.Platform) bool {
actual.Variant == requested.Variant
}

func selectIndexImage(index v1.ImageIndex, platform v1.Platform) (v1.Image, error) {
func selectIndexImage(ctx context.Context, s *store, index v1.ImageIndex, platform v1.Platform) (v1.Image, error) {
manifest, err := index.IndexManifest()
if err != nil {
return nil, err
Expand All @@ -91,7 +103,7 @@ func selectIndexImage(index v1.ImageIndex, platform v1.Platform) (v1.Image, erro
if child.Platform == nil || !imagePlatformMatches(*child.Platform, platform) {
continue
}
img, actual, err := indexChildImage(index, child)
img, actual, err := indexChildImage(ctx, s, index, child)
if err != nil {
return nil, err
}
Expand All @@ -104,7 +116,7 @@ func selectIndexImage(index v1.ImageIndex, platform v1.Platform) (v1.Image, erro
if child.Platform != nil {
continue
}
img, actual, err := indexChildImage(index, child)
img, actual, err := indexChildImage(ctx, s, index, child)
if err != nil {
return nil, err
}
Expand All @@ -115,13 +127,13 @@ func selectIndexImage(index v1.ImageIndex, platform v1.Platform) (v1.Image, erro
return nil, fmt.Errorf("no image for platform %s", platform)
}

func selectImage(desc *remote.Descriptor, platform v1.Platform) (v1.Image, error) {
func selectImage(ctx context.Context, s *store, desc *remote.Descriptor, platform v1.Platform) (v1.Image, error) {
if desc.MediaType.IsIndex() {
index, err := desc.ImageIndex()
if err != nil {
return nil, err
}
return selectIndexImage(index, platform)
return selectIndexImage(ctx, s, index, platform)
}
if !desc.MediaType.IsImage() {
return nil, fmt.Errorf("unexpected media type %s", desc.MediaType)
Expand All @@ -130,7 +142,7 @@ func selectImage(desc *remote.Descriptor, platform v1.Platform) (v1.Image, error
if err != nil {
return nil, err
}
actual, err := imagePlatform(img)
actual, err := imagePlatform(ctx, s, img)
if err != nil {
return nil, err
}
Expand All @@ -142,7 +154,7 @@ func selectImage(desc *remote.Descriptor, platform v1.Platform) (v1.Image, error

type imageFetcher func(context.Context, name.Reference, v1.Platform) (v1.Image, error)

func fetchRemoteImage(ctx context.Context, ref name.Reference, platform v1.Platform) (v1.Image, error) {
func fetchRemoteImage(ctx context.Context, s *store, ref name.Reference, platform v1.Platform) (v1.Image, error) {
desc, err := remote.Get(ref,
remote.WithContext(ctx),
remote.WithAuthFromKeychain(authn.DefaultKeychain),
Expand All @@ -151,11 +163,13 @@ func fetchRemoteImage(ctx context.Context, ref name.Reference, platform v1.Platf
if err != nil {
return nil, err
}
return selectImage(desc, platform)
return selectImage(ctx, s, desc, platform)
}

func pullImage(ctx context.Context, s *store, ref string, platform ocispec.Platform) error {
return pullImageWithFetcher(ctx, s, ref, platform, fetchRemoteImage)
return pullImageWithFetcher(ctx, s, ref, platform, func(ctx context.Context, ref name.Reference, platform v1.Platform) (v1.Image, error) {
return fetchRemoteImage(ctx, s, ref, platform)
})
}

func pullImageWithFetcher(ctx context.Context, s *store, ref string, platform ocispec.Platform, fetch imageFetcher) error {
Expand Down
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