1 files changed, 126 insertions, 0 deletions
diff --git a/cmd/crane/cmd/push.go b/cmd/crane/cmd/push.go
new file mode 100644
index 0000000..887621e
--- /dev/null
+++ b/cmd/crane/cmd/push.go
@@ -0,0 +1,126 @@
+// Copyright 2018 Google LLC All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cmd
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/google/go-containerregistry/pkg/crane"
+	"github.com/google/go-containerregistry/pkg/name"
+	v1 "github.com/google/go-containerregistry/pkg/v1"
+	"github.com/google/go-containerregistry/pkg/v1/layout"
+	"github.com/google/go-containerregistry/pkg/v1/partial"
+	"github.com/google/go-containerregistry/pkg/v1/remote"
+	"github.com/spf13/cobra"
+)
+
+// NewCmdPush creates a new cobra.Command for the push subcommand.
+func NewCmdPush(options *[]crane.Option) *cobra.Command {
+	index := false
+	imageRefs := ""
+	cmd := &cobra.Command{
+		Use:   "push PATH IMAGE",
+		Short: "Push local image contents to a remote registry",
+		Long:  `If the PATH is a directory, it will be read as an OCI image layout. Otherwise, PATH is assumed to be a docker-style tarball.`,
+		Args:  cobra.ExactArgs(2),
+		RunE: func(_ *cobra.Command, args []string) error {
+			path, tag := args[0], args[1]
+
+			img, err := loadImage(path, index)
+			if err != nil {
+				return err
+			}
+
+			o := crane.GetOptions(*options...)
+			ref, err := name.ParseReference(tag, o.Name...)
+			if err != nil {
+				return err
+			}
+			var h v1.Hash
+			switch t := img.(type) {
+			case v1.Image:
+				if err := remote.Write(ref, t, o.Remote...); err != nil {
+					return err
+				}
+				if h, err = t.Digest(); err != nil {
+					return err
+				}
+			case v1.ImageIndex:
+				if err := remote.WriteIndex(ref, t, o.Remote...); err != nil {
+					return err
+				}
+				if h, err = t.Digest(); err != nil {
+					return err
+				}
+			default:
+				return fmt.Errorf("cannot push type (%T) to registry", img)
+			}
+
+			digest := ref.Context().Digest(h.String())
+			if imageRefs != "" {
+				return os.WriteFile(imageRefs, []byte(digest.String()), 0600)
+			}
+			// TODO(mattmoor): think about printing the digest to standard out
+			// to facilitate command composition similar to ko build.
+
+			return nil
+		},
+	}
+	cmd.Flags().BoolVar(&index, "index", false, "push a collection of images as a single index, currently required if PATH contains multiple images")
+	cmd.Flags().StringVar(&imageRefs, "image-refs", "", "path to file where a list of the published image references will be written")
+	return cmd
+}
+
+func loadImage(path string, index bool) (partial.WithRawManifest, error) {
+	stat, err := os.Stat(path)
+	if err != nil {
+		return nil, err
+	}
+
+	if !stat.IsDir() {
+		img, err := crane.Load(path)
+		if err != nil {
+			return nil, fmt.Errorf("loading %s as tarball: %w", path, err)
+		}
+		return img, nil
+	}
+
+	l, err := layout.ImageIndexFromPath(path)
+	if err != nil {
+		return nil, fmt.Errorf("loading %s as OCI layout: %w", path, err)
+	}
+
+	if index {
+		return l, nil
+	}
+
+	m, err := l.IndexManifest()
+	if err != nil {
+		return nil, err
+	}
+	if len(m.Manifests) != 1 {
+		return nil, fmt.Errorf("layout contains %d entries, consider --index", len(m.Manifests))
+	}
+
+	desc := m.Manifests[0]
+	if desc.MediaType.IsImage() {
+		return l.Image(desc.Digest)
+	} else if desc.MediaType.IsIndex() {
+		return l.ImageIndex(desc.Digest)
+	}
+
+	return nil, fmt.Errorf("layout contains non-image (mediaType: %q), consider --index", desc.MediaType)
+}