89 lines
2.9 KiB
Go
89 lines
2.9 KiB
Go
package archive
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import (
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"context"
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"io"
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ocilayout "github.com/containers/image/oci/layout"
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"github.com/containers/image/types"
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digest "github.com/opencontainers/go-digest"
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imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1"
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"github.com/pkg/errors"
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)
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type ociArchiveImageSource struct {
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ref ociArchiveReference
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unpackedSrc types.ImageSource
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tempDirRef tempDirOCIRef
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}
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// newImageSource returns an ImageSource for reading from an existing directory.
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// newImageSource untars the file and saves it in a temp directory
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func newImageSource(ctx *types.SystemContext, ref ociArchiveReference) (types.ImageSource, error) {
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tempDirRef, err := createUntarTempDir(ref)
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if err != nil {
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return nil, errors.Wrap(err, "error creating temp directory")
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}
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unpackedSrc, err := tempDirRef.ociRefExtracted.NewImageSource(ctx)
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if err != nil {
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if err := tempDirRef.deleteTempDir(); err != nil {
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return nil, errors.Wrapf(err, "error deleting temp directory", tempDirRef.tempDirectory)
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}
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return nil, err
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}
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return &ociArchiveImageSource{ref: ref,
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unpackedSrc: unpackedSrc,
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tempDirRef: tempDirRef}, nil
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}
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// LoadManifestDescriptor loads the manifest
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func LoadManifestDescriptor(imgRef types.ImageReference) (imgspecv1.Descriptor, error) {
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ociArchRef, ok := imgRef.(ociArchiveReference)
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if !ok {
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return imgspecv1.Descriptor{}, errors.Errorf("error typecasting, need type ociArchiveReference")
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}
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tempDirRef, err := createUntarTempDir(ociArchRef)
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if err != nil {
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return imgspecv1.Descriptor{}, errors.Wrap(err, "error creating temp directory")
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}
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defer tempDirRef.deleteTempDir()
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descriptor, err := ocilayout.LoadManifestDescriptor(tempDirRef.ociRefExtracted)
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if err != nil {
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return imgspecv1.Descriptor{}, errors.Wrap(err, "error loading index")
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}
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return descriptor, nil
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}
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// Reference returns the reference used to set up this source.
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func (s *ociArchiveImageSource) Reference() types.ImageReference {
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return s.ref
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}
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// Close removes resources associated with an initialized ImageSource, if any.
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// Close deletes the temporary directory at dst
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func (s *ociArchiveImageSource) Close() error {
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defer s.tempDirRef.deleteTempDir()
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return s.unpackedSrc.Close()
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}
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// GetManifest returns the image's manifest along with its MIME type
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// (which may be empty when it can't be determined but the manifest is available).
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func (s *ociArchiveImageSource) GetManifest() ([]byte, string, error) {
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return s.unpackedSrc.GetManifest()
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}
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func (s *ociArchiveImageSource) GetTargetManifest(digest digest.Digest) ([]byte, string, error) {
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return s.unpackedSrc.GetTargetManifest(digest)
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}
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// GetBlob returns a stream for the specified blob, and the blob's size.
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func (s *ociArchiveImageSource) GetBlob(info types.BlobInfo) (io.ReadCloser, int64, error) {
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return s.unpackedSrc.GetBlob(info)
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}
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func (s *ociArchiveImageSource) GetSignatures(c context.Context) ([][]byte, error) {
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return s.unpackedSrc.GetSignatures(c)
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}
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