2017-12-11 17:33:26 -05:00
|
|
|
package registry
|
|
|
|
|
|
|
|
import (
|
|
|
|
"fmt"
|
|
|
|
"net/http"
|
|
|
|
|
|
|
|
"github.com/docker/distribution/manifest/schema2"
|
2018-06-17 15:41:58 -04:00
|
|
|
digest "github.com/opencontainers/go-digest"
|
2017-12-11 17:33:26 -05:00
|
|
|
)
|
|
|
|
|
2018-06-17 15:41:58 -04:00
|
|
|
// Digest returns the digest for an image.
|
|
|
|
func (r *Registry) Digest(image Image) (digest.Digest, error) {
|
|
|
|
if len(image.Digest) > 1 {
|
|
|
|
// return early if we already have an image digest.
|
|
|
|
return image.Digest, nil
|
|
|
|
}
|
|
|
|
|
|
|
|
url := r.url("/v2/%s/manifests/%s", image.Path, image.Tag)
|
2017-12-11 17:33:26 -05:00
|
|
|
r.Logf("registry.manifests.get url=%s repository=%s ref=%s",
|
2018-06-17 15:41:58 -04:00
|
|
|
url, image.Path, image.Tag)
|
2017-12-11 17:33:26 -05:00
|
|
|
|
|
|
|
req, err := http.NewRequest("GET", url, nil)
|
|
|
|
if err != nil {
|
|
|
|
return "", err
|
|
|
|
}
|
|
|
|
|
2018-06-17 15:41:58 -04:00
|
|
|
req.Header.Set("Accept", schema2.MediaTypeManifest)
|
2017-12-11 17:33:26 -05:00
|
|
|
resp, err := r.Client.Do(req)
|
|
|
|
if err != nil {
|
|
|
|
return "", err
|
|
|
|
}
|
|
|
|
defer resp.Body.Close()
|
|
|
|
|
2017-12-18 15:17:27 -05:00
|
|
|
if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusNotFound {
|
2017-12-11 17:33:26 -05:00
|
|
|
return "", fmt.Errorf("Got status code: %d", resp.StatusCode)
|
|
|
|
}
|
|
|
|
|
2018-06-17 15:41:58 -04:00
|
|
|
return digest.FromString(resp.Header.Get("Docker-Content-Digest")), nil
|
2017-12-11 17:33:26 -05:00
|
|
|
}
|