57 lines
1.5 KiB
Go
57 lines
1.5 KiB
Go
package image
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import (
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is "github.com/containers/image/storage"
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"github.com/containers/storage"
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"github.com/pkg/errors"
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)
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// FindImage searches for an image with a matching the given name or ID in the given store
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func FindImage(store storage.Store, image string) (*storage.Image, error) {
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var img *storage.Image
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ref, err := is.Transport.ParseStoreReference(store, image)
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if err == nil {
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img, err = is.Transport.GetStoreImage(store, ref)
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}
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if err != nil {
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img2, err2 := store.Image(image)
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if err2 != nil {
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if ref == nil {
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return nil, errors.Wrapf(err, "error parsing reference to image %q", image)
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}
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return nil, errors.Wrapf(err, "unable to locate image %q", image)
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}
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img = img2
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}
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return img, nil
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}
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// Size returns the size of the image in the given store
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func Size(store storage.Store, img storage.Image) (int64, error) {
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is.Transport.SetStore(store)
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storeRef, err := is.Transport.ParseStoreReference(store, "@"+img.ID)
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if err != nil {
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return -1, err
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}
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imgRef, err := storeRef.NewImage(nil)
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if err != nil {
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return -1, err
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}
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imgSize, err := imgRef.Size()
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if err != nil {
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return -1, err
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}
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return imgSize, nil
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}
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// TopLayer returns the ID of the top layer of the image
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func GetTopLayerID(img storage.Image) (string, error) {
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metadata, err := ParseMetadata(img)
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if err != nil {
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return "", err
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}
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// Get the digest of the first blob
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digest := string(metadata.Blobs[0].Digest)
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// Return the first layer associated with the given digest
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return metadata.Layers[digest][0], nil
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}
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