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publish: Build OCI compliant app manifest
Signed-off-by: Mike Sul <[email protected]>
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//go:build publish | ||
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package internal | ||
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import ( | ||
"context" | ||
"encoding/json" | ||
"github.com/docker/distribution" | ||
"github.com/docker/distribution/manifest" | ||
"github.com/docker/distribution/manifest/ocischema" | ||
v1 "github.com/opencontainers/image-spec/specs-go/v1" | ||
) | ||
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type ( | ||
AppManifest struct { | ||
ocischema.Manifest | ||
// ArtifactType is the IANA media type of the artifact this schema refers to. | ||
ArtifactType string `json:"artifactType,omitempty"` | ||
Manifests []distribution.Descriptor `json:"manifests,omitempty"` | ||
} | ||
ManifestBuilder struct { | ||
//*ocischema.Builder | ||
bs distribution.BlobService | ||
manifest AppManifest | ||
} | ||
) | ||
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var ( | ||
AppManifestTemplate = AppManifest{ | ||
Manifest: ocischema.Manifest{ | ||
Versioned: manifest.Versioned{ | ||
SchemaVersion: 2, | ||
MediaType: v1.MediaTypeImageManifest, | ||
}, | ||
Config: distribution.Descriptor{ | ||
MediaType: v1.DescriptorEmptyJSON.MediaType, | ||
Digest: v1.DescriptorEmptyJSON.Digest, | ||
Size: v1.DescriptorEmptyJSON.Size, | ||
}, | ||
Annotations: map[string]string{"compose-app": "v1"}, | ||
}, | ||
ArtifactType: "application/vnd.fio+compose-app", | ||
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} | ||
) | ||
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func NewManifestBuilder(bs distribution.BlobService) distribution.ManifestBuilder { | ||
return &ManifestBuilder{ | ||
bs: bs, | ||
manifest: AppManifestTemplate, | ||
} | ||
} | ||
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func (mb *ManifestBuilder) Build(ctx context.Context) (distribution.Manifest, error) { | ||
_, err := mb.bs.Stat(ctx, mb.manifest.Config.Digest) | ||
switch err { | ||
case nil: | ||
// Config blob is present in the blob store | ||
return fromStruct(mb.manifest) | ||
case distribution.ErrBlobUnknown: | ||
// nop | ||
default: | ||
return nil, err | ||
} | ||
// Add config to the blob store | ||
_, err = mb.bs.Put(ctx, mb.manifest.Config.MediaType, v1.DescriptorEmptyJSON.Data) | ||
if err != nil { | ||
return nil, err | ||
} | ||
return fromStruct(mb.manifest) | ||
} | ||
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// AppendReference adds a reference to the current ManifestBuilder. | ||
func (mb *ManifestBuilder) AppendReference(d distribution.Describable) error { | ||
mb.manifest.Layers = append(mb.manifest.Layers, d.Descriptor()) | ||
return nil | ||
} | ||
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// References returns the current references added to this builder. | ||
func (mb *ManifestBuilder) References() []distribution.Descriptor { | ||
return mb.manifest.Layers | ||
} | ||
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func (mb *ManifestBuilder) SetLayerMetaManifests(manifests []distribution.Descriptor) { | ||
mb.manifest.Manifests = manifests | ||
} | ||
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func fromStruct(m AppManifest) (*ocischema.DeserializedManifest, error) { | ||
canonical, err := json.MarshalIndent(&m, "", " ") | ||
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dm := ocischema.DeserializedManifest{} | ||
err = dm.UnmarshalJSON(canonical) | ||
if err != nil { | ||
return nil, err | ||
} | ||
return &dm, err | ||
} |
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