Documentation ¶
Overview ¶
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.
Index ¶
- Variables
- func ManifestMediaTypes() (mediaTypes []string)
- func RegisterManifestSchema(mediatype string, u UnmarshalFunc) error
- func UnmarshalManifest(ctHeader string, p []byte) (Manifest, Descriptor, error)
- type BlobCreateOption
- type BlobDeleter
- type BlobDescriptorService
- type BlobEnumerator
- type BlobIngester
- type BlobProvider
- type BlobServer
- type BlobService
- type BlobStatter
- type BlobStore
- type BlobWriter
- type Describable
- type Descriptor
- type ErrBlobInvalidDigest
- type ErrBlobMounted
- type ErrManifestBlobUnknown
- type ErrManifestNameInvalid
- type ErrManifestUnknown
- type ErrManifestUnknownRevision
- type ErrManifestUnverified
- type ErrManifestVerification
- type ErrRepositoryNameInvalid
- type ErrRepositoryUnknown
- type ErrTagUnknown
- type Manifest
- type ManifestBuilder
- type ManifestEnumerator
- type ManifestService
- type ManifestServiceOption
- type Namespace
- type ReadSeekCloser
- type Repository
- type RepositoryEnumerator
- type Scope
- type SignaturesGetter
- type TagService
- type UnmarshalFunc
- type WithTagOption
Constants ¶
This section is empty.
Variables ¶
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") )
var ErrAccessDenied = errors.New("access denied")
ErrAccessDenied is returned when an access to a requested resource is denied.
var ErrManifestNotModified = errors.New("manifest not modified")
ErrManifestNotModified is returned when a conditional manifest GetByTag returns nil due to the client indicating it has the latest version
var ErrUnsupported = errors.New("operation unsupported")
ErrUnsupported is returned when an unimplemented or unsupported action is performed
var GlobalScope = Scope(fullScope{})
GlobalScope represents the full namespace scope which contains all other scopes.
Functions ¶
func ManifestMediaTypes ¶
func ManifestMediaTypes() (mediaTypes []string)
ManifestMediaTypes returns the supported media types for manifests.
func RegisterManifestSchema ¶
func RegisterManifestSchema(mediatype string, u UnmarshalFunc) error
RegisterManifestSchema registers an UnmarshalFunc for a given schema type. This should be called from specific
func UnmarshalManifest ¶
func UnmarshalManifest(ctHeader string, p []byte) (Manifest, Descriptor, error)
UnmarshalManifest looks up manifest unmarshal functions based on MediaType
Types ¶
type BlobCreateOption ¶
type BlobCreateOption interface {
Apply(interface{}) error
}
BlobCreateOption is a general extensible function argument for blob creation methods. A BlobIngester may choose to honor any or none of the given BlobCreateOptions, which can be specific to the implementation of the BlobIngester receiving them. TODO (brianbland): unify this with ManifestServiceOption in the future
type BlobDeleter ¶
BlobDeleter enables deleting blobs from storage.
type BlobDescriptorService ¶
type BlobDescriptorService interface { BlobStatter // 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 BlobEnumerator ¶
type BlobEnumerator interface {
Enumerate(ctx context.Context, ingester func(dgst digest.Digest) error) error
}
BlobEnumerator enables iterating over blobs from storage
type BlobIngester ¶
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, options ...BlobCreateOption) (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 ¶
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 ¶
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 ¶
type BlobService interface { BlobStatter BlobProvider BlobIngester }
BlobService combines the operations to access, read and write blobs. This can be used to describe remote blob services.
type BlobStatter ¶
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 ¶
type BlobStore interface { BlobService BlobServer BlobDeleter }
BlobStore represent the entire suite of blob related operations. Such an implementation can access, read, write, delete and serve blobs.
type BlobWriter ¶
type BlobWriter interface { io.WriteCloser io.ReaderFrom // Size returns the number of bytes written to this blob. Size() int64 // 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 Describable ¶
type Describable interface {
Descriptor() Descriptor
}
Describable is an interface for descriptors
type Descriptor ¶
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.
func (Descriptor) Descriptor ¶
func (d Descriptor) Descriptor() Descriptor
Descriptor returns the descriptor, to make it satisfy the Describable interface. Note that implementations of Describable are generally objects which can be described, not simply descriptors; this exception is in place to make it more convenient to pass actual descriptors to functions that expect Describable objects.
type ErrBlobInvalidDigest ¶
ErrBlobInvalidDigest returned when digest check fails.
func (ErrBlobInvalidDigest) Error ¶
func (err ErrBlobInvalidDigest) Error() string
type ErrBlobMounted ¶
type ErrBlobMounted struct { From reference.Canonical Descriptor Descriptor }
ErrBlobMounted returned when a blob is mounted from another repository instead of initiating an upload session.
func (ErrBlobMounted) Error ¶
func (err ErrBlobMounted) Error() string
type ErrManifestBlobUnknown ¶
ErrManifestBlobUnknown returned when a referenced blob cannot be found.
func (ErrManifestBlobUnknown) Error ¶
func (err ErrManifestBlobUnknown) Error() string
type ErrManifestNameInvalid ¶
ErrManifestNameInvalid should be used to denote an invalid manifest name. Reason may set, indicating the cause of invalidity.
func (ErrManifestNameInvalid) Error ¶
func (err ErrManifestNameInvalid) Error() string
type ErrManifestUnknown ¶
ErrManifestUnknown is returned if the manifest is not known by the registry.
func (ErrManifestUnknown) Error ¶
func (err ErrManifestUnknown) Error() string
type ErrManifestUnknownRevision ¶
ErrManifestUnknownRevision is returned when a manifest cannot be found by revision within a repository.
func (ErrManifestUnknownRevision) Error ¶
func (err ErrManifestUnknownRevision) Error() string
type ErrManifestUnverified ¶
type ErrManifestUnverified struct{}
ErrManifestUnverified is returned when the registry is unable to verify the manifest.
func (ErrManifestUnverified) Error ¶
func (ErrManifestUnverified) Error() string
type ErrManifestVerification ¶
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 ¶
func (errs ErrManifestVerification) Error() string
type ErrRepositoryNameInvalid ¶
ErrRepositoryNameInvalid should be used to denote an invalid repository name. Reason may set, indicating the cause of invalidity.
func (ErrRepositoryNameInvalid) Error ¶
func (err ErrRepositoryNameInvalid) Error() string
type ErrRepositoryUnknown ¶
type ErrRepositoryUnknown struct {
Name string
}
ErrRepositoryUnknown is returned if the named repository is not known by the registry.
func (ErrRepositoryUnknown) Error ¶
func (err ErrRepositoryUnknown) Error() string
type ErrTagUnknown ¶
type ErrTagUnknown struct {
Tag string
}
ErrTagUnknown is returned if the given tag is not known by the tag service
func (ErrTagUnknown) Error ¶
func (err ErrTagUnknown) Error() string
type Manifest ¶
type Manifest interface { // References returns a list of objects which make up this manifest. // The references are strictly ordered from base to head. A reference // is anything which can be represented by a distribution.Descriptor References() []Descriptor // Payload provides the serialized format of the manifest, in addition to // the mediatype. Payload() (mediatype string, payload []byte, err error) }
Manifest represents a registry object specifying a set of references and an optional target
type ManifestBuilder ¶
type ManifestBuilder interface { // Build creates the manifest from his builder. Build(ctx context.Context) (Manifest, error) // References returns a list of objects which have been added to this // builder. The dependencies are returned in the order they were added, // which should be from base to head. References() []Descriptor // AppendReference includes the given object in the manifest after any // existing dependencies. If the add fails, such as when adding an // unsupported dependency, an error may be returned. AppendReference(dependency Describable) error }
ManifestBuilder creates a manifest allowing one to include dependencies. Instances can be obtained from a version-specific manifest package. Manifest specific data is passed into the function which creates the builder.
type ManifestEnumerator ¶
type ManifestEnumerator interface { // Enumerate calls ingester for each manifest. Enumerate(ctx context.Context, ingester func(digest.Digest) error) error }
ManifestEnumerator enables iterating over manifests
type ManifestService ¶
type ManifestService interface { // Exists returns true if the manifest exists. Exists(ctx context.Context, dgst digest.Digest) (bool, error) // Get retrieves the manifest specified by the given digest Get(ctx context.Context, dgst digest.Digest, options ...ManifestServiceOption) (Manifest, error) // Put creates or updates the given manifest returning the manifest digest Put(ctx context.Context, manifest Manifest, options ...ManifestServiceOption) (digest.Digest, error) // Delete removes the manifest specified by the given digest. Deleting // a manifest that doesn't exist will return ErrManifestNotFound Delete(ctx context.Context, dgst digest.Digest) error }
ManifestService describes operations on image manifests.
type ManifestServiceOption ¶
type ManifestServiceOption interface {
Apply(ManifestService) error
}
ManifestServiceOption is a function argument for Manifest Service methods
func WithTag ¶
func WithTag(tag string) ManifestServiceOption
WithTag allows a tag to be passed into Put
type Namespace ¶
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 reference.Named) (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) // Blobs returns a blob enumerator to access all blobs Blobs() BlobEnumerator // BlobStatter returns a BlobStatter to control BlobStatter() BlobStatter }
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 ¶
type ReadSeekCloser interface { io.ReadSeeker io.Closer }
ReadSeekCloser is the primary reader type for blob data, combining io.ReadSeeker with io.Closer.
type Repository ¶
type Repository interface { // Named returns the name of the repository. Named() reference.Named // 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 // Tags returns a reference to this repositories tag service Tags(ctx context.Context) TagService }
Repository is a named collection of manifests and layers.
type RepositoryEnumerator ¶
type RepositoryEnumerator interface {
Enumerate(ctx context.Context, ingester func(string) error) error
}
RepositoryEnumerator describes an operation to enumerate repositories
type Scope ¶
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 SignaturesGetter ¶
type SignaturesGetter interface {
GetSignatures(ctx context.Context, manifestDigest digest.Digest) ([]digest.Digest, error)
}
SignaturesGetter provides an interface for getting the signatures of a schema1 manifest. If the digest referred to is not a schema1 manifest, an error should be returned.
type TagService ¶
type TagService interface { // Get retrieves the descriptor identified by the tag. Some // implementations may differentiate between "trusted" tags and // "untrusted" tags. If a tag is "untrusted", the mapping will be returned // as an ErrTagUntrusted error, with the target descriptor. Get(ctx context.Context, tag string) (Descriptor, error) // Tag associates the tag with the provided descriptor, updating the // current association, if needed. Tag(ctx context.Context, tag string, desc Descriptor) error // Untag removes the given tag association Untag(ctx context.Context, tag string) error // All returns the set of tags managed by this tag service All(ctx context.Context) ([]string, error) // Lookup returns the set of tags referencing the given digest. Lookup(ctx context.Context, digest Descriptor) ([]string, error) }
TagService provides access to information about tagged objects.
type UnmarshalFunc ¶
type UnmarshalFunc func([]byte) (Manifest, Descriptor, error)
UnmarshalFunc implements manifest unmarshalling a given MediaType
type WithTagOption ¶
type WithTagOption struct{ Tag string }
WithTagOption holds a tag
func (WithTagOption) Apply ¶
func (o WithTagOption) Apply(m ManifestService) error
Apply conforms to the ManifestServiceOption interface
Directories ¶
Path | Synopsis |
---|---|
cmd
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registry-api-descriptor-template
registry-api-descriptor-template uses the APIDescriptor defined in the api/v2 package to execute templates passed to the command line.
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registry-api-descriptor-template uses the APIDescriptor defined in the api/v2 package to execute templates passed to the command line. |
Package context provides several utilities for working with golang.org/x/net/context in http requests.
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Package context provides several utilities for working with golang.org/x/net/context in http requests. |
contrib
|
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Package digest provides a generalized type to opaquely represent message digests and their operations within the registry.
|
Package digest provides a generalized type to opaquely represent message digests and their operations within the registry. |
Package health provides a generic health checking framework.
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Package health provides a generic health checking framework. |
Package reference provides a general type to represent any way of referencing images within the registry.
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Package reference provides a general type to represent any way of referencing images within the registry. |
Package registry provides the main entrypoints for running a registry.
|
Package registry provides the main entrypoints for running a registry. |
api/v2
Package v2 describes routes, urls and the error codes used in the Docker Registry JSON HTTP API V2.
|
Package v2 describes routes, urls and the error codes used in the Docker Registry JSON HTTP API V2. |
auth
Package auth defines a standard interface for request access controllers.
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Package auth defines a standard interface for request access controllers. |
auth/htpasswd
Package htpasswd provides a simple authentication scheme that checks for the user credential hash in an htpasswd formatted file in a configuration-determined location.
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Package htpasswd provides a simple authentication scheme that checks for the user credential hash in an htpasswd formatted file in a configuration-determined location. |
auth/silly
Package silly provides a simple authentication scheme that checks for the existence of an Authorization header and issues access if is present and non-empty.
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Package silly provides a simple authentication scheme that checks for the existence of an Authorization header and issues access if is present and non-empty. |
storage
Package storage contains storage services for use in the registry application.
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Package storage contains storage services for use in the registry application. |
storage/cache
Package cache provides facilities to speed up access to the storage backend.
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Package cache provides facilities to speed up access to the storage backend. |
storage/driver/azure
Package azure provides a storagedriver.StorageDriver implementation to store blobs in Microsoft Azure Blob Storage Service.
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Package azure provides a storagedriver.StorageDriver implementation to store blobs in Microsoft Azure Blob Storage Service. |
storage/driver/base
Package base provides a base implementation of the storage driver that can be used to implement common checks.
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Package base provides a base implementation of the storage driver that can be used to implement common checks. |
storage/driver/gcs
Package gcs implements the Google Cloud Storage driver backend.
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Package gcs implements the Google Cloud Storage driver backend. |
storage/driver/middleware/cloudfront
Package middleware - cloudfront wrapper for storage libs N.B. currently only works with S3, not arbitrary sites
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Package middleware - cloudfront wrapper for storage libs N.B. currently only works with S3, not arbitrary sites |
storage/driver/oss
Package oss implements the Aliyun OSS Storage driver backend.
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Package oss implements the Aliyun OSS Storage driver backend. |
storage/driver/s3-aws
Package s3 provides a storagedriver.StorageDriver implementation to store blobs in Amazon S3 cloud storage.
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Package s3 provides a storagedriver.StorageDriver implementation to store blobs in Amazon S3 cloud storage. |
storage/driver/s3-goamz
Package s3 provides a storagedriver.StorageDriver implementation to store blobs in Amazon S3 cloud storage.
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Package s3 provides a storagedriver.StorageDriver implementation to store blobs in Amazon S3 cloud storage. |
storage/driver/swift
Package swift provides a storagedriver.StorageDriver implementation to store blobs in Openstack Swift object storage.
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Package swift provides a storagedriver.StorageDriver implementation to store blobs in Openstack Swift object storage. |
Package uuid provides simple UUID generation.
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Package uuid provides simple UUID generation. |