/
loader.go
224 lines (191 loc) · 6.4 KB
/
loader.go
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// Copyright 2022 The kpt and Nephio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package oci
import (
"archive/tar"
"context"
"encoding/json"
"fmt"
"io"
"io/fs"
"path/filepath"
"strings"
"github.com/GoogleContainerTools/kpt/pkg/oci"
"github.com/google/go-containerregistry/pkg/v1/mutate"
"github.com/nephio-project/porch/api/porch/v1alpha1"
"github.com/nephio-project/porch/pkg/repository"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
"k8s.io/klog/v2"
)
const (
annotationKeyLifecycle = "kpt.dev/lifecycle"
annotationKeyRevision = "kpt.dev/revision"
)
var tracer = otel.Tracer("oci")
func (r *ociRepository) getLifecycle(ctx context.Context, imageRef oci.ImageDigestName) (v1alpha1.PackageRevisionLifecycle, error) {
ctx, span := tracer.Start(ctx, "ociRepository::getLifecycle", trace.WithAttributes(
attribute.Stringer("image", imageRef),
))
defer span.End()
ociImage, err := r.storage.ToRemoteImage(ctx, imageRef)
if err != nil {
return "", err
}
manifest, err := r.storage.CachedManifest(ctx, ociImage)
if err != nil {
return "", fmt.Errorf("error fetching manifest for image: %w", err)
}
lifecycleValue := manifest.Annotations[annotationKeyLifecycle]
switch lifecycleValue {
case "", string(v1alpha1.PackageRevisionLifecycleDraft):
return v1alpha1.PackageRevisionLifecycleDraft, nil
case string(v1alpha1.PackageRevisionLifecycleProposed):
return v1alpha1.PackageRevisionLifecycleProposed, nil
case string(v1alpha1.PackageRevisionLifecyclePublished):
return v1alpha1.PackageRevisionLifecyclePublished, nil
case string(v1alpha1.PackageRevisionLifecycleDeletionProposed):
return v1alpha1.PackageRevisionLifecycleDeletionProposed, nil
default:
return "", fmt.Errorf("unknown package revision lifecycle %q", lifecycleValue)
}
}
func (r *ociRepository) getRevisionNumber(ctx context.Context, imageRef oci.ImageDigestName) (string, error) {
ctx, span := tracer.Start(ctx, "ociRepository::getRevision", trace.WithAttributes(
attribute.Stringer("image", imageRef),
))
defer span.End()
ociImage, err := r.storage.ToRemoteImage(ctx, imageRef)
if err != nil {
return "", err
}
manifest, err := r.storage.CachedManifest(ctx, ociImage)
if err != nil {
return "", fmt.Errorf("error fetching manifest for image: %w", err)
}
return manifest.Annotations[annotationKeyRevision], nil
}
func (r *ociRepository) loadTasks(ctx context.Context, imageRef oci.ImageDigestName) ([]v1alpha1.Task, error) {
ctx, span := tracer.Start(ctx, "ociRepository::loadTasks", trace.WithAttributes(
attribute.Stringer("image", imageRef),
))
defer span.End()
configFile, err := r.storage.CachedConfigFile(ctx, imageRef)
if err != nil {
return nil, fmt.Errorf("error fetching config for image: %w", err)
}
var tasks []v1alpha1.Task
for i := range configFile.History {
history := &configFile.History[i]
command := history.CreatedBy
if strings.HasPrefix(command, "kpt:") {
task := v1alpha1.Task{}
b := []byte(strings.TrimPrefix(command, "kpt:"))
if err := json.Unmarshal(b, &task); err != nil {
klog.Warningf("failed to unmarshal task command %q: %v", command, err)
continue
}
tasks = append(tasks, task)
} else {
klog.Warningf("unknown task command in history %q", command)
}
}
return tasks, nil
}
func LookupImageTag(ctx context.Context, s *oci.Storage, imageName oci.ImageTagName) (*oci.ImageDigestName, error) {
ctx, span := tracer.Start(ctx, "Storage::LookupImageTag", trace.WithAttributes(
attribute.Stringer("image", imageName),
))
defer span.End()
ociImage, err := s.ToRemoteImage(ctx, imageName)
if err != nil {
return nil, err
}
digest, err := ociImage.Digest()
if err != nil {
return nil, err
}
return &oci.ImageDigestName{
Image: imageName.Image,
Digest: digest.String(),
}, nil
}
func LoadResources(ctx context.Context, s *oci.Storage, imageName *oci.ImageDigestName) (*repository.PackageResources, error) {
ctx, span := tracer.Start(ctx, "Storage::LoadResources", trace.WithAttributes(
attribute.Stringer("image", imageName),
))
defer span.End()
if imageName.Digest == "" {
// New package; no digest yet
return &repository.PackageResources{
Contents: map[string]string{},
}, nil
}
fetcher := func() (io.ReadCloser, error) {
ociImage, err := s.ToRemoteImage(ctx, imageName)
if err != nil {
return nil, err
}
reader := mutate.Extract(ociImage)
return reader, nil
}
// We need the per-digest cache here because otherwise we have to make a network request to look up the manifest in remote.Image
// (this could be cached by the go-containerregistry library, for some reason it is not...)
// TODO: Is there then any real reason to _also_ have the image-layer cache?
f, err := oci.WithCacheFile(filepath.Join(s.GetCacheDir(), "resources", imageName.Digest), fetcher)
if err != nil {
return nil, err
}
defer f.Close()
tarReader := tar.NewReader(f)
// TODO: Check hash here? Or otherwise handle error?
resources, err := loadResourcesFromTar(tarReader)
if err != nil {
return nil, err
}
return resources, nil
}
func loadResourcesFromTar(tarReader *tar.Reader) (*repository.PackageResources, error) {
resources := &repository.PackageResources{
Contents: map[string]string{},
}
for {
hdr, err := tarReader.Next()
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
path := hdr.Name
fileType := hdr.FileInfo().Mode().Type()
switch fileType {
case fs.ModeDir:
// Ignored
case fs.ModeSymlink:
// We probably don't want to support this; feels high-risk, low-reward
return nil, fmt.Errorf("package cannot contain symlink (%q)", path)
case 0:
b, err := io.ReadAll(tarReader)
if err != nil {
return nil, fmt.Errorf("error reading %q from image: %w", path, err)
}
resources.Contents[path] = string(b)
default:
return nil, fmt.Errorf("package cannot unsupported entry type for %q (%v)", path, fileType)
}
}
return resources, nil
}