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Add a new reference package abstracting repositories, tags and digests

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There seems to be a need for a type that represents a way of pointing
to an image, irrespective of the implementation.

This patch defines a Reference interface and provides 3 implementations:
- TagReference: when only a tag is provided
- DigestReference: when a digest (according to the digest package) is
  provided, can include optional tag as well

Validation of references are purely syntactic.

There is also a strong type for tags, analogous to digests, as well
as a strong type for Repository from which clients can access the
hostname alone, or the repository name without the hostname, or both
together via the String() method.

For Repository, the files names.go and names_test.go were moved from
the v2 package.

Signed-off-by: Tibor Vass <tibor@docker.com>
This commit is contained in:
Tibor Vass 2015-07-10 14:36:04 -04:00 • committed by Derek McGowan
parent d5ca577ad1
commit b72f1fd2e3
7 changed files with 28 additions and 378 deletions
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9
docs/client/repository.go
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@ -15,6 +15,7 @@ import (
"github.com/docker/distribution/context"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest/schema1"
"github.com/docker/distribution/reference"
"github.com/docker/distribution/registry/api/v2"
"github.com/docker/distribution/registry/client/transport"
"github.com/docker/distribution/registry/storage/cache"
@ -96,9 +97,9 @@ func (r *registry) Repositories(ctx context.Context, entries []string, last stri
return numFilled, returnErr
}
// NewRepository creates a new Repository for the given repository name and base URL
func NewRepository(ctx context.Context, name, baseURL string, transport http.RoundTripper) (distribution.Repository, error) {
if err := v2.ValidateRepositoryName(name); err != nil {
// NewRepository creates a new Repository for the given canonical repository name and base URL.
func NewRepository(ctx context.Context, canonicalName, baseURL string, transport http.RoundTripper) (distribution.Repository, error) {
if _, err := reference.NewRepository(canonicalName); err != nil {
return nil, err
}
@ -115,7 +116,7 @@ func NewRepository(ctx context.Context, name, baseURL string, transport http.Rou
return &repository{
client: client,
ub: ub,
name: name,
name: canonicalName,
context: ctx,
}, nil
}