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errorblobstore.go
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errorblobstore.go
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package server
import (
"fmt"
"net/http"
"github.com/docker/distribution"
"github.com/docker/distribution/context"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/reference"
)
// errorBlobStore wraps a distribution.BlobStore for a particular repo.
// before delegating, it ensures auth completed and there were no errors relevant to the repo.
type errorBlobStore struct {
store distribution.BlobStore
repo *repository
}
var _ distribution.BlobStore = &errorBlobStore{}
func (r *errorBlobStore) Stat(ctx context.Context, dgst digest.Digest) (distribution.Descriptor, error) {
if err := r.repo.checkPendingErrors(ctx); err != nil {
return distribution.Descriptor{}, err
}
return r.store.Stat(WithRepository(ctx, r.repo), dgst)
}
func (r *errorBlobStore) Get(ctx context.Context, dgst digest.Digest) ([]byte, error) {
if err := r.repo.checkPendingErrors(ctx); err != nil {
return nil, err
}
return r.store.Get(WithRepository(ctx, r.repo), dgst)
}
func (r *errorBlobStore) Open(ctx context.Context, dgst digest.Digest) (distribution.ReadSeekCloser, error) {
if err := r.repo.checkPendingErrors(ctx); err != nil {
return nil, err
}
return r.store.Open(WithRepository(ctx, r.repo), dgst)
}
func (r *errorBlobStore) Put(ctx context.Context, mediaType string, p []byte) (distribution.Descriptor, error) {
if err := r.repo.checkPendingErrors(ctx); err != nil {
return distribution.Descriptor{}, err
}
return r.store.Put(WithRepository(ctx, r.repo), mediaType, p)
}
func (r *errorBlobStore) Create(ctx context.Context, options ...distribution.BlobCreateOption) (distribution.BlobWriter, error) {
if err := r.repo.checkPendingErrors(ctx); err != nil {
return nil, err
}
ctx = WithRepository(ctx, r.repo)
opts, err := effectiveCreateOptions(options)
if err != nil {
return nil, err
}
err = checkPendingCrossMountErrors(ctx, opts)
if err != nil {
context.GetLogger(ctx).Infof("disabling cross-repo mount because of an error: %v", err)
options = append(options, guardCreateOptions{DisableCrossMount: true})
} else if !opts.Mount.ShouldMount {
options = append(options, guardCreateOptions{DisableCrossMount: true})
} else {
context.GetLogger(ctx).Debugf("attempting cross-repo mount")
options = append(options, statCrossMountCreateOptions{
ctx: ctx,
destRepo: r.repo,
})
}
return r.store.Create(ctx, options...)
}
func (r *errorBlobStore) Resume(ctx context.Context, id string) (distribution.BlobWriter, error) {
if err := r.repo.checkPendingErrors(ctx); err != nil {
return nil, err
}
return r.store.Resume(WithRepository(ctx, r.repo), id)
}
func (r *errorBlobStore) ServeBlob(ctx context.Context, w http.ResponseWriter, req *http.Request, dgst digest.Digest) error {
if err := r.repo.checkPendingErrors(ctx); err != nil {
return err
}
return r.store.ServeBlob(WithRepository(ctx, r.repo), w, req, dgst)
}
func (r *errorBlobStore) Delete(ctx context.Context, dgst digest.Digest) error {
if err := r.repo.checkPendingErrors(ctx); err != nil {
return err
}
return r.store.Delete(WithRepository(ctx, r.repo), dgst)
}
// checkPendingCrossMountErrors returns true if a cross-repo mount has been requested with given create
// options. If requested and there are pending authorization errors for source repository, the error will be
// returned. Cross-repo mount must not be allowed in case of error.
func checkPendingCrossMountErrors(ctx context.Context, opts *distribution.CreateOptions) error {
if !opts.Mount.ShouldMount {
return nil
}
namespace, name, err := getNamespaceName(opts.Mount.From.Name())
if err != nil {
return err
}
return checkPendingErrors(context.GetLogger(ctx), ctx, namespace, name)
}
// guardCreateOptions ensures the expected options type is passed, and optionally disables cross mounting
type guardCreateOptions struct {
DisableCrossMount bool
}
var _ distribution.BlobCreateOption = guardCreateOptions{}
func (f guardCreateOptions) Apply(v interface{}) error {
opts, ok := v.(*distribution.CreateOptions)
if !ok {
return fmt.Errorf("Unexpected create options: %#v", v)
}
if f.DisableCrossMount {
opts.Mount.ShouldMount = false
}
return nil
}
// statCrossMountCreateOptions ensures the expected options type is passed, and optionally pre-fills the cross-mount stat info
type statCrossMountCreateOptions struct {
ctx context.Context
destRepo *repository
}
var _ distribution.BlobCreateOption = statCrossMountCreateOptions{}
func (f statCrossMountCreateOptions) Apply(v interface{}) error {
opts, ok := v.(*distribution.CreateOptions)
if !ok {
return fmt.Errorf("Unexpected create options: %#v", v)
}
if !opts.Mount.ShouldMount {
return nil
}
desc, err := statSourceRepository(f.ctx, f.destRepo, opts.Mount.From, opts.Mount.From.Digest())
if err != nil {
context.GetLogger(f.ctx).Infof("cannot mount blob %s from repository %s: %v - disabling cross-repo mount",
opts.Mount.From.Digest().String(),
opts.Mount.From.Name(),
err)
opts.Mount.ShouldMount = false
return nil
}
opts.Mount.Stat = &desc
return nil
}
func statSourceRepository(
ctx context.Context,
destRepo *repository,
sourceRepoName reference.Named,
dgst digest.Digest,
) (desc distribution.Descriptor, err error) {
upstreamRepo, err := dockerRegistry.Repository(ctx, sourceRepoName)
if err != nil {
return distribution.Descriptor{}, err
}
namespace, name, err := getNamespaceName(sourceRepoName.Name())
if err != nil {
return distribution.Descriptor{}, err
}
repo := *destRepo
repo.namespace = namespace
repo.name = name
repo.Repository = upstreamRepo
return repo.Blobs(ctx).Stat(ctx, dgst)
}