Allow podman push to push manifest lists

When doing a podman images, manifests lists look just like images, so
it is logical that users would assume that they can just podman push them
to a registry.  The problem is we throw out weird errors when this happens
and users need to somehow figure out this is a manifest list rather then
an image, and frankly the user will not understand the difference.

This PR will make podman push just do the right thing, by failing over and
attempting to push the manifest if it fails to push the image.

Fix up handling of manifest push

Protocol should bring back a digest string, which can either be
printed or stored in a file.

We should not reimplement the manifest push setup code in the tunnel
code but take advantage of the api path, to make sure remote and local
work the same way.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

1 files changed, 13 insertions, 14 deletions

diff --git a/pkg/domain/infra/abi/manifest.go b/pkg/domain/infra/abi/manifest.go
index a68ed8788..139032ad6 100644
--- a/pkg/domain/infra/abi/manifest.go
+++ b/pkg/domain/infra/abi/manifest.go
@@ -7,7 +7,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"strings"
 
@@ -24,9 +23,8 @@ import (
 	"github.com/containers/podman/v2/pkg/domain/entities"
 	"github.com/opencontainers/go-digest"
 	imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1"
-	"github.com/sirupsen/logrus"
-
 	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
 )
 
 // ManifestCreate implements logic for creating manifest lists via ImageEngine
@@ -243,14 +241,20 @@ func (ir *ImageEngine) ManifestRemove(ctx context.Context, names []string) (stri
 }
 
 // ManifestPush pushes a manifest list or image index to the destination
-func (ir *ImageEngine) ManifestPush(ctx context.Context, name, destination string, opts entities.ManifestPushOptions) error {
+func (ir *ImageEngine) ManifestPush(ctx context.Context, name, destination string, opts entities.ImagePushOptions) (string, error) {
 	listImage, err := ir.Libpod.ImageRuntime().NewFromLocal(name)
 	if err != nil {
-		return errors.Wrapf(err, "error retrieving local image from image name %s", name)
+		return "", errors.Wrapf(err, "error retrieving local image from image name %s", name)
 	}
 	dest, err := alltransports.ParseImageName(destination)
 	if err != nil {
-		return err
+		oldErr := err
+		// Try adding the images default transport
+		destination2 := libpodImage.DefaultTransport + destination
+		dest, err = alltransports.ParseImageName(destination2)
+		if err != nil {
+			return "", oldErr
+		}
 	}
 
 	var manifestType string
@@ -261,7 +265,7 @@ func (ir *ImageEngine) ManifestPush(ctx context.Context, name, destination strin
 		case "v2s2", "docker":
 			manifestType = manifest.DockerV2Schema2MediaType
 		default:
-			return errors.Errorf("unknown format %q. Choose one of the supported formats: 'oci' or 'v2s2'", opts.Format)
+			return "", errors.Errorf("unknown format %q. Choose one of the supported formats: 'oci' or 'v2s2'", opts.Format)
 		}
 	}
 
@@ -297,13 +301,8 @@ func (ir *ImageEngine) ManifestPush(ctx context.Context, name, destination strin
 		options.ReportWriter = os.Stderr
 	}
 	manDigest, err := listImage.PushManifest(dest, options)
-	if err == nil && opts.Purge {
+	if err == nil && opts.Rm {
 		_, err = ir.Libpod.GetStore().DeleteImage(listImage.ID(), true)
 	}
-	if opts.DigestFile != "" {
-		if err = ioutil.WriteFile(opts.DigestFile, []byte(manDigest.String()), 0644); err != nil {
-			return buildahUtil.GetFailureCause(err, errors.Wrapf(err, "failed to write digest to file %q", opts.DigestFile))
-		}
-	}
-	return err
+	return manDigest.String(), err
 }