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imagetools: refactor combining repository logic

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This patch modifies the existing combining code in imagetools create to
provide better support for multiple repositories down the road.
Specifically, the code should no longer rely on a single repository
being used for all sources and tags, and should resolve descriptors in
their relevant repositories.

Signed-off-by: Justin Chadwell <me@jedevc.com>
This commit is contained in:
Justin Chadwell
2022-05-10 15:23:26 +01:00
parent 07992e66e0
commit d3412f1039
3 changed files with 53 additions and 44 deletions
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42
util/imagetools/create.go
View File

@ -17,46 +17,46 @@ import (
"golang.org/x/sync/errgroup"
)
func (r *Resolver) Combine(ctx context.Context, in string, descs []ocispec.Descriptor) ([]byte, ocispec.Descriptor, error) {
ref, err := parseRef(in)
if err != nil {
return nil, ocispec.Descriptor{}, err
}
type Source struct {
Desc ocispec.Descriptor
Ref reference.Named
}
func (r *Resolver) Combine(ctx context.Context, srcs []*Source) ([]byte, ocispec.Descriptor, error) {
eg, ctx := errgroup.WithContext(ctx)
dts := make([][]byte, len(descs))
dts := make([][]byte, len(srcs))
for i := range dts {
func(i int) {
eg.Go(func() error {
dt, err := r.GetDescriptor(ctx, ref.String(), descs[i])
dt, err := r.GetDescriptor(ctx, srcs[i].Ref.String(), srcs[i].Desc)
if err != nil {
return err
}
dts[i] = dt
if descs[i].MediaType == "" {
if srcs[i].Desc.MediaType == "" {
mt, err := detectMediaType(dt)
if err != nil {
return err
}
descs[i].MediaType = mt
srcs[i].Desc.MediaType = mt
}
mt := descs[i].MediaType
mt := srcs[i].Desc.MediaType
switch mt {
case images.MediaTypeDockerSchema2Manifest, ocispec.MediaTypeImageManifest:
p := descs[i].Platform
if descs[i].Platform == nil {
p := srcs[i].Desc.Platform
if srcs[i].Desc.Platform == nil {
p = &ocispec.Platform{}
}
if p.OS == "" || p.Architecture == "" {
if err := r.loadPlatform(ctx, p, in, dt); err != nil {
if err := r.loadPlatform(ctx, p, srcs[i].Ref.String(), dt); err != nil {
return err
}
}
descs[i].Platform = p
srcs[i].Desc.Platform = p
case images.MediaTypeDockerSchema1Manifest:
return errors.Errorf("schema1 manifests are not allowed in manifest lists")
}
@ -71,14 +71,14 @@ func (r *Resolver) Combine(ctx context.Context, in string, descs []ocispec.Descr
}
// on single source, return original bytes
if len(descs) == 1 {
if mt := descs[0].MediaType; mt == images.MediaTypeDockerSchema2ManifestList || mt == ocispec.MediaTypeImageIndex {
return dts[0], descs[0], nil
if len(srcs) == 1 {
if mt := srcs[0].Desc.MediaType; mt == images.MediaTypeDockerSchema2ManifestList || mt == ocispec.MediaTypeImageIndex {
return dts[0], srcs[0].Desc, nil
}
}
m := map[digest.Digest]int{}
newDescs := make([]ocispec.Descriptor, 0, len(descs))
newDescs := make([]ocispec.Descriptor, 0, len(srcs))
addDesc := func(d ocispec.Descriptor) {
idx, ok := m[d.Digest]
@ -103,8 +103,8 @@ func (r *Resolver) Combine(ctx context.Context, in string, descs []ocispec.Descr
}
}
for i, desc := range descs {
switch desc.MediaType {
for i, src := range srcs {
switch src.Desc.MediaType {
case images.MediaTypeDockerSchema2ManifestList, ocispec.MediaTypeImageIndex:
var mfst ocispec.Index
if err := json.Unmarshal(dts[i], &mfst); err != nil {
@ -114,7 +114,7 @@ func (r *Resolver) Combine(ctx context.Context, in string, descs []ocispec.Descr
addDesc(d)
}
default:
addDesc(desc)
addDesc(src.Desc)
}
}