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Add converter options to convert schema1 manifest to docker schema2 manifest

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Signed-off-by: Edgar Lee <edgar.lee@docker.com>
This commit is contained in:
Edgar Lee 2018-01-29 14:37:44 -08:00
parent 5f89502a24
commit d2f073c6f5
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GPG Key ID: 5AB6AC155437A4D4
1 changed files with 38 additions and 5 deletions
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43
remotes/docker/schema1/converter.go
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@ -103,8 +103,41 @@ func (c *Converter) Handle(ctx context.Context, desc ocispec.Descriptor) ([]ocis
} }
} }
// ConvertOptions provides options on converting a docker schema1 manifest.
type ConvertOptions struct {
// ManifestMediaType specifies the media type of the manifest OCI descriptor.
ManifestMediaType string
// ConfigMediaType specifies the media type of the manifest config OCI
// descriptor.
ConfigMediaType string
}
// ConvertOpt allows configuring a convert operation.
type ConvertOpt func(context.Context, *ConvertOptions) error
// UseDockerSchema2 is used to indicate that a schema1 manifest should be
// converted into the media types for a docker schema2 manifest.
func UseDockerSchema2() ConvertOpt {
return func(ctx context.Context, o *ConvertOptions) error {
o.ManifestMediaType = images.MediaTypeDockerSchema2Manifest
o.ConfigMediaType = images.MediaTypeDockerSchema2Config
return nil
}
}
// Convert a docker manifest to an OCI descriptor // Convert a docker manifest to an OCI descriptor
func (c *Converter) Convert(ctx context.Context) (ocispec.Descriptor, error) { func (c *Converter) Convert(ctx context.Context, opts ...ConvertOpt) (ocispec.Descriptor, error) {
co := ConvertOptions{
ManifestMediaType: ocispec.MediaTypeImageManifest,
ConfigMediaType: ocispec.MediaTypeImageConfig,
}
for _, opt := range opts {
if err := opt(ctx, &co); err != nil {
return ocispec.Descriptor{}, err
}
}
history, diffIDs, err := c.schema1ManifestHistory() history, diffIDs, err := c.schema1ManifestHistory()
if err != nil { if err != nil {
return ocispec.Descriptor{}, errors.Wrap(err, "schema 1 conversion failed") return ocispec.Descriptor{}, errors.Wrap(err, "schema 1 conversion failed")
@ -121,13 +154,13 @@ func (c *Converter) Convert(ctx context.Context) (ocispec.Descriptor, error) {
DiffIDs: diffIDs, DiffIDs: diffIDs,
} }
b, err := json.Marshal(img) b, err := json.MarshalIndent(img, "", " ")
if err != nil { if err != nil {
return ocispec.Descriptor{}, errors.Wrap(err, "failed to marshal image") return ocispec.Descriptor{}, errors.Wrap(err, "failed to marshal image")
} }
config := ocispec.Descriptor{ config := ocispec.Descriptor{
MediaType: ocispec.MediaTypeImageConfig, MediaType: co.ConfigMediaType,
Digest: digest.Canonical.FromBytes(b), Digest: digest.Canonical.FromBytes(b),
Size: int64(len(b)), Size: int64(len(b)),
} }
@ -145,13 +178,13 @@ func (c *Converter) Convert(ctx context.Context) (ocispec.Descriptor, error) {
Layers: layers, Layers: layers,
} }
mb, err := json.Marshal(manifest) mb, err := json.MarshalIndent(manifest, "", " ")
if err != nil { if err != nil {
return ocispec.Descriptor{}, errors.Wrap(err, "failed to marshal image") return ocispec.Descriptor{}, errors.Wrap(err, "failed to marshal image")
} }
desc := ocispec.Descriptor{ desc := ocispec.Descriptor{
MediaType: ocispec.MediaTypeImageManifest, MediaType: co.ManifestMediaType,
Digest: digest.Canonical.FromBytes(mb), Digest: digest.Canonical.FromBytes(mb),
Size: int64(len(mb)), Size: int64(len(mb)),
} }