/
image_metadata.go
56 lines (49 loc) · 1.32 KB
/
image_metadata.go
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package image
import (
"github.com/google/go-containerregistry/pkg/name"
v1 "github.com/google/go-containerregistry/pkg/v1"
v1Types "github.com/google/go-containerregistry/pkg/v1/types"
)
// Metadata represents container image metadata.
type Metadata struct {
// ID is the sha256 of this image config json (not manifest)
ID string
// Size in bytes of all the image layer content sizes (does not include config / manifest / index metadata sizes)
Size int64
Config v1.ConfigFile
MediaType v1Types.MediaType
// --- below fields are optional metadata
Tags []name.Tag
RawManifest []byte
ManifestDigest string
RawConfig []byte
RepoDigests []string
Architecture string
Variant string
OS string
}
// readImageMetadata extracts the most pertinent information from the underlying image tar.
func readImageMetadata(img v1.Image) (Metadata, error) {
id, err := img.ConfigName()
if err != nil {
return Metadata{}, err
}
config, err := img.ConfigFile()
if err != nil {
return Metadata{}, err
}
mediaType, err := img.MediaType()
if err != nil {
return Metadata{}, err
}
rawConfig, err := img.RawConfigFile()
if err != nil {
return Metadata{}, err
}
return Metadata{
ID: id.String(),
Config: *config,
MediaType: mediaType,
RawConfig: rawConfig,
}, nil
}