func()

in lambda/internal/tarfile/reader.go [63:97]

• 32 lines of code
• 11 McCabe index (conditional complexity)

func (r *S3FileReader) ChooseManifestItem(ref reference.NamedTagged, sourceIndex int) (*ManifestItem, int, error) {
	switch {
	case ref != nil && sourceIndex != -1:
		return nil, -1, errors.Errorf("Internal error: Cannot have both ref %s and source index @%d",
			ref.String(), sourceIndex)

	case ref != nil:
		refString := ref.String()
		for i := range r.Manifest {
			for tagIndex, tag := range r.Manifest[i].RepoTags {
				parsedTag, err := reference.ParseNormalizedNamed(tag)
				if err != nil {
					return nil, -1, errors.Wrapf(err, "Invalid tag %#v in manifest.json item @%d", tag, i)
				}
				if parsedTag.String() == refString {
					return &r.Manifest[i], tagIndex, nil
				}
			}
		}
		return nil, -1, errors.Errorf("Tag %#v not found", refString)

	case sourceIndex != -1:
		if sourceIndex >= len(r.Manifest) {
			return nil, -1, errors.Errorf("Invalid source index @%d, only %d manifest items available",
				sourceIndex, len(r.Manifest))
		}
		return &r.Manifest[sourceIndex], -1, nil

	default:
		if len(r.Manifest) != 1 {
			return nil, -1, errors.Errorf("Unexpected tar manifest.json: expected 1 item, got %d", len(r.Manifest))
		}
		return &r.Manifest[0], -1, nil
	}
}