add better generate

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

vendor/github.com/genuinetools/reg/registry/manifest.go

@@ -0,0 +1,86 @@
+package registry
+
+import (
+	"io/ioutil"
+	"net/http"
+
+	"github.com/docker/distribution"
+	"github.com/docker/distribution/manifest/manifestlist"
+	"github.com/docker/distribution/manifest/schema1"
+	"github.com/docker/distribution/manifest/schema2"
+)
+
+// Manifest returns the manifest for a specific repository:tag.
+func (r *Registry) Manifest(repository, ref string) (distribution.Manifest, error) {
+	uri := r.url("/v2/%s/manifests/%s", repository, ref)
+	r.Logf("registry.manifests uri=%s repository=%s ref=%s", uri, repository, ref)
+
+	req, err := http.NewRequest("GET", uri, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Add("Accept", schema2.MediaTypeManifest)
+	req.Header.Add("Accept", manifestlist.MediaTypeManifestList)
+
+	resp, err := r.Client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	r.Logf("registry.manifests resp.Status=%s, body=%s", resp.Status, body)
+
+	m, _, err := distribution.UnmarshalManifest(resp.Header.Get("Content-Type"), body)
+	if err != nil {
+		return nil, err
+	}
+
+	return m, nil
+}
+
+// ManifestList gets the registry v2 manifest list.
+func (r *Registry) ManifestList(repository, ref string) (manifestlist.ManifestList, error) {
+	uri := r.url("/v2/%s/manifests/%s", repository, ref)
+	r.Logf("registry.manifests uri=%s repository=%s ref=%s", uri, repository, ref)
+
+	var m manifestlist.ManifestList
+	if _, err := r.getJSON(uri, &m, true); err != nil {
+		r.Logf("registry.manifests response=%v", m)
+		return m, err
+	}
+
+	return m, nil
+}
+
+// ManifestV2 gets the registry v2 manifest.
+func (r *Registry) ManifestV2(repository, ref string) (schema2.Manifest, error) {
+	uri := r.url("/v2/%s/manifests/%s", repository, ref)
+	r.Logf("registry.manifests uri=%s repository=%s ref=%s", uri, repository, ref)
+
+	var m schema2.Manifest
+	if _, err := r.getJSON(uri, &m, true); err != nil {
+		r.Logf("registry.manifests response=%v", m)
+		return m, err
+	}
+
+	return m, nil
+}
+
+// ManifestV1 gets the registry v1 manifest.
+func (r *Registry) ManifestV1(repository, ref string) (schema1.SignedManifest, error) {
+	uri := r.url("/v2/%s/manifests/%s", repository, ref)
+	r.Logf("registry.manifests uri=%s repository=%s ref=%s", uri, repository, ref)
+
+	var m schema1.SignedManifest
+	if _, err := r.getJSON(uri, &m, false); err != nil {
+		r.Logf("registry.manifests response=%v", m)
+		return m, err
+	}
+
+	return m, nil
+}