distribution: github.com/convox-archive/distribution Index | Files | Directories

package distribution

import "github.com/convox-archive/distribution"

Package distribution will define the interfaces for the components of docker distribution. The goal is to allow users to reliably package, ship and store content related to docker images.

This is currently a work in progress. More details are available in the README.md.


Package Files

blobs.go doc.go errors.go registry.go


var (
    // ErrBlobExists returned when blob already exists
    ErrBlobExists = errors.New("blob exists")

    // ErrBlobDigestUnsupported when blob digest is an unsupported version.
    ErrBlobDigestUnsupported = errors.New("unsupported blob digest")

    // ErrBlobUnknown when blob is not found.
    ErrBlobUnknown = errors.New("unknown blob")

    // ErrBlobUploadUnknown returned when upload is not found.
    ErrBlobUploadUnknown = errors.New("blob upload unknown")

    // ErrBlobInvalidLength returned when the blob has an expected length on
    // commit, meaning mismatched with the descriptor or an invalid value.
    ErrBlobInvalidLength = errors.New("blob invalid length")

    // ErrUnsupported returned when an unsupported operation is attempted
    ErrUnsupported = errors.New("unsupported operation")
var GlobalScope = Scope(fullScope{})

GlobalScope represents the full namespace scope which contains all other scopes.

type BlobDeleter Uses

type BlobDeleter interface {
    Delete(ctx context.Context, dgst digest.Digest) error

BlobDeleter enables deleting blobs from storage.

type BlobDescriptorService Uses

type BlobDescriptorService interface {

    // SetDescriptor assigns the descriptor to the digest. The provided digest and
    // the digest in the descriptor must map to identical content but they may
    // differ on their algorithm. The descriptor must have the canonical
    // digest of the content and the digest algorithm must match the
    // annotators canonical algorithm.
    // Such a facility can be used to map blobs between digest domains, with
    // the restriction that the algorithm of the descriptor must match the
    // canonical algorithm (ie sha256) of the annotator.
    SetDescriptor(ctx context.Context, dgst digest.Digest, desc Descriptor) error

    // Clear enables descriptors to be unlinked
    Clear(ctx context.Context, dgst digest.Digest) error

BlobDescriptorService manages metadata about a blob by digest. Most implementations will not expose such an interface explicitly. Such mappings should be maintained by interacting with the BlobIngester. Hence, this is left off of BlobService and BlobStore.

type BlobIngester Uses

type BlobIngester interface {
    // Put inserts the content p into the blob service, returning a descriptor
    // or an error.
    Put(ctx context.Context, mediaType string, p []byte) (Descriptor, error)

    // Create allocates a new blob writer to add a blob to this service. The
    // returned handle can be written to and later resumed using an opaque
    // identifier. With this approach, one can Close and Resume a BlobWriter
    // multiple times until the BlobWriter is committed or cancelled.
    Create(ctx context.Context) (BlobWriter, error)

    // Resume attempts to resume a write to a blob, identified by an id.
    Resume(ctx context.Context, id string) (BlobWriter, error)

BlobIngester ingests blob data.

type BlobProvider Uses

type BlobProvider interface {
    // Get returns the entire blob identified by digest along with the descriptor.
    Get(ctx context.Context, dgst digest.Digest) ([]byte, error)

    // Open provides a ReadSeekCloser to the blob identified by the provided
    // descriptor. If the blob is not known to the service, an error will be
    // returned.
    Open(ctx context.Context, dgst digest.Digest) (ReadSeekCloser, error)

BlobProvider describes operations for getting blob data.

type BlobServer Uses

type BlobServer interface {
    // ServeBlob attempts to serve the blob, identifed by dgst, via http. The
    // service may decide to redirect the client elsewhere or serve the data
    // directly.
    // This handler only issues successful responses, such as 2xx or 3xx,
    // meaning it serves data or issues a redirect. If the blob is not
    // available, an error will be returned and the caller may still issue a
    // response.
    // The implementation may serve the same blob from a different digest
    // domain. The appropriate headers will be set for the blob, unless they
    // have already been set by the caller.
    ServeBlob(ctx context.Context, w http.ResponseWriter, r *http.Request, dgst digest.Digest) error

BlobServer can serve blobs via http.

type BlobService Uses

type BlobService interface {

BlobService combines the operations to access, read and write blobs. This can be used to describe remote blob services.

type BlobStatter Uses

type BlobStatter interface {
    // Stat provides metadata about a blob identified by the digest. If the
    // blob is unknown to the describer, ErrBlobUnknown will be returned.
    Stat(ctx context.Context, dgst digest.Digest) (Descriptor, error)

BlobStatter makes blob descriptors available by digest. The service may provide a descriptor of a different digest if the provided digest is not canonical.

type BlobStore Uses

type BlobStore interface {

BlobStore represent the entire suite of blob related operations. Such an implementation can access, read, write, delete and serve blobs.

type BlobWriter Uses

type BlobWriter interface {

    // ID returns the identifier for this writer. The ID can be used with the
    // Blob service to later resume the write.
    ID() string

    // StartedAt returns the time this blob write was started.
    StartedAt() time.Time

    // Commit completes the blob writer process. The content is verified
    // against the provided provisional descriptor, which may result in an
    // error. Depending on the implementation, written data may be validated
    // against the provisional descriptor fields. If MediaType is not present,
    // the implementation may reject the commit or assign "application/octet-
    // stream" to the blob. The returned descriptor may have a different
    // digest depending on the blob store, referred to as the canonical
    // descriptor.
    Commit(ctx context.Context, provisional Descriptor) (canonical Descriptor, err error)

    // Cancel ends the blob write without storing any data and frees any
    // associated resources. Any data written thus far will be lost. Cancel
    // implementations should allow multiple calls even after a commit that
    // result in a no-op. This allows use of Cancel in a defer statement,
    // increasing the assurance that it is correctly called.
    Cancel(ctx context.Context) error

BlobWriter provides a handle for inserting data into a blob store. Instances should be obtained from BlobWriteService.Writer and BlobWriteService.Resume. If supported by the store, a writer can be recovered with the id.

type Descriptor Uses

type Descriptor struct {
    // MediaType describe the type of the content. All text based formats are
    // encoded as utf-8.
    MediaType string `json:"mediaType,omitempty"`

    // Size in bytes of content.
    Size int64 `json:"size,omitempty"`

    // Digest uniquely identifies the content. A byte stream can be verified
    // against against this digest.
    Digest digest.Digest `json:"digest,omitempty"`

Descriptor describes targeted content. Used in conjunction with a blob store, a descriptor can be used to fetch, store and target any kind of blob. The struct also describes the wire protocol format. Fields should only be added but never changed.

type ErrBlobInvalidDigest Uses

type ErrBlobInvalidDigest struct {
    Digest digest.Digest
    Reason error

ErrBlobInvalidDigest returned when digest check fails.

func (ErrBlobInvalidDigest) Error Uses

func (err ErrBlobInvalidDigest) Error() string

type ErrManifestBlobUnknown Uses

type ErrManifestBlobUnknown struct {
    Digest digest.Digest

ErrManifestBlobUnknown returned when a referenced blob cannot be found.

func (ErrManifestBlobUnknown) Error Uses

func (err ErrManifestBlobUnknown) Error() string

type ErrManifestUnknown Uses

type ErrManifestUnknown struct {
    Name string
    Tag  string

ErrManifestUnknown is returned if the manifest is not known by the registry.

func (ErrManifestUnknown) Error Uses

func (err ErrManifestUnknown) Error() string

type ErrManifestUnknownRevision Uses

type ErrManifestUnknownRevision struct {
    Name     string
    Revision digest.Digest

ErrManifestUnknownRevision is returned when a manifest cannot be found by revision within a repository.

func (ErrManifestUnknownRevision) Error Uses

func (err ErrManifestUnknownRevision) Error() string

type ErrManifestUnverified Uses

type ErrManifestUnverified struct{}

ErrManifestUnverified is returned when the registry is unable to verify the manifest.

func (ErrManifestUnverified) Error Uses

func (ErrManifestUnverified) Error() string

type ErrManifestVerification Uses

type ErrManifestVerification []error

ErrManifestVerification provides a type to collect errors encountered during manifest verification. Currently, it accepts errors of all types, but it may be narrowed to those involving manifest verification.

func (ErrManifestVerification) Error Uses

func (errs ErrManifestVerification) Error() string

type ErrRepositoryNameInvalid Uses

type ErrRepositoryNameInvalid struct {
    Name   string
    Reason error

ErrRepositoryNameInvalid should be used to denote an invalid repository name. Reason may set, indicating the cause of invalidity.

func (ErrRepositoryNameInvalid) Error Uses

func (err ErrRepositoryNameInvalid) Error() string

type ErrRepositoryUnknown Uses

type ErrRepositoryUnknown struct {
    Name string

ErrRepositoryUnknown is returned if the named repository is not known by the registry.

func (ErrRepositoryUnknown) Error Uses

func (err ErrRepositoryUnknown) Error() string

type ManifestService Uses

type ManifestService interface {
    // Exists returns true if the manifest exists.
    Exists(dgst digest.Digest) (bool, error)

    // Get retrieves the identified by the digest, if it exists.
    Get(dgst digest.Digest) (*manifest.SignedManifest, error)

    // Delete removes the manifest, if it exists.
    Delete(dgst digest.Digest) error

    // Put creates or updates the manifest.
    Put(manifest *manifest.SignedManifest) error

    // Tags lists the tags under the named repository.
    Tags() ([]string, error)

    // ExistsByTag returns true if the manifest exists.
    ExistsByTag(tag string) (bool, error)

    // GetByTag retrieves the named manifest, if it exists.
    GetByTag(tag string, options ...ManifestServiceOption) (*manifest.SignedManifest, error)

ManifestService provides operations on image manifests.

type ManifestServiceOption Uses

type ManifestServiceOption func(ManifestService) error

ManifestServiceOption is a function argument for Manifest Service methods

type Namespace Uses

type Namespace interface {
    // Scope describes the names that can be used with this Namespace. The
    // global namespace will have a scope that matches all names. The scope
    // effectively provides an identity for the namespace.
    Scope() Scope

    // Repository should return a reference to the named repository. The
    // registry may or may not have the repository but should always return a
    // reference.
    Repository(ctx context.Context, name string) (Repository, error)

    // Repositories fills 'repos' with a lexigraphically sorted catalog of repositories
    // up to the size of 'repos' and returns the value 'n' for the number of entries
    // which were filled.  'last' contains an offset in the catalog, and 'err' will be
    // set to io.EOF if there are no more entries to obtain.
    Repositories(ctx context.Context, repos []string, last string) (n int, err error)

Namespace represents a collection of repositories, addressable by name. Generally, a namespace is backed by a set of one or more services, providing facilities such as registry access, trust, and indexing.

type ReadSeekCloser Uses

type ReadSeekCloser interface {

ReadSeekCloser is the primary reader type for blob data, combining io.ReadSeeker with io.Closer.

type Repository Uses

type Repository interface {
    // Name returns the name of the repository.
    Name() string

    // Manifests returns a reference to this repository's manifest service.
    // with the supplied options applied.
    Manifests(ctx context.Context, options ...ManifestServiceOption) (ManifestService, error)

    // Blobs returns a reference to this repository's blob service.
    Blobs(ctx context.Context) BlobStore

    // Signatures returns a reference to this repository's signatures service.
    Signatures() SignatureService

Repository is a named collection of manifests and layers.

type Scope Uses

type Scope interface {
    // Contains returns true if the name belongs to the namespace.
    Contains(name string) bool

Scope defines the set of items that match a namespace.

type SignatureService Uses

type SignatureService interface {
    // Get retrieves all of the signature blobs for the specified digest.
    Get(dgst digest.Digest) ([][]byte, error)

    // Put stores the signature for the provided digest.
    Put(dgst digest.Digest, signatures ...[]byte) error

SignatureService provides operations on signatures.


contextPackage context provides several utilities for working with golang.org/x/net/context in http requests.
digestPackage digest provides a generalized type to opaquely represent message digests and their operations within the registry.
healthPackage health provides a generic health checking framework.
registryPackage registry is a placeholder package for registry interface definitions and utilities.
registry/authPackage auth defines a standard interface for request access controllers.
registry/auth/htpasswdPackage htpasswd provides a simple authentication scheme that checks for the user credential hash in an htpasswd formatted file in a configuration-determined location.
registry/auth/sillyPackage silly provides a simple authentication scheme that checks for the existence of an Authorization header and issues access if is present and non-empty.
registry/storagePackage storage contains storage services for use in the registry application.
registry/storage/cachePackage cache provides facilities to speed up access to the storage backend.
registry/storage/driver/azurePackage azure provides a storagedriver.StorageDriver implementation to store blobs in Microsoft Azure Blob Storage Service.
registry/storage/driver/basePackage base provides a base implementation of the storage driver that can be used to implement common checks.
registry/storage/driver/middleware/cloudfrontPackage middleware - cloudfront wrapper for storage libs N.B.
registry/storage/driver/radosPackage rados implements the rados storage driver backend.
registry/storage/driver/s3Package s3 provides a storagedriver.StorageDriver implementation to store blobs in Amazon S3 cloud storage.
registry/storage/driver/swiftPackage swift provides a storagedriver.StorageDriver implementation to store blobs in Openstack Swift object storage.
uuidPackage uuid provides simple UUID generation.

Package distribution imports 9 packages (graph). Updated 2017-06-20. Refresh now. Tools for package owners. This is an inactive package (no imports and no commits in at least two years).