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manifest: references should cover all children

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To allow generic manifest walking, we define an interface method of
`References` that returns the referenced items in the manifest. The
current implementation does not return the config target from schema2,
making this useless for most applications.

The garbage collector has been modified to show the utility of this
correctly formed `References` method. We may be able to make more
generic traversal methods with this, as well.

Signed-off-by: Stephen J Day <stephen.day@docker.com>
This commit is contained in:
Stephen J Day
2016-10-12 17:20:27 -07:00
parent e3aabfb47e
commit c9aaff00f8
9 changed files with 81 additions and 63 deletions
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7
manifest/schema1/config_builder.go
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@@ -9,11 +9,10 @@ import (
"github.com/docker/distribution"
"github.com/docker/distribution/context"
"github.com/docker/distribution/reference"
"github.com/docker/libtrust"
"github.com/docker/distribution/digest"
"github.com/docker/distribution/manifest"
"github.com/docker/distribution/reference"
"github.com/docker/libtrust"
)
type diffID digest.Digest
@@ -95,7 +94,7 @@ func (mb *configManifestBuilder) Build(ctx context.Context) (m distribution.Mani
}
if len(img.RootFS.DiffIDs) != len(mb.descriptors) {
return nil, errors.New("number of descriptors and number of layers in rootfs must match")
return nil, fmt.Errorf("number of descriptors and number of layers in rootfs must match: len(%v) != len(%v)", img.RootFS.DiffIDs, mb.descriptors)
}
// Generate IDs for each layer