Added test file

Author: akclace

tests/registry_push/main.go

@@ -0,0 +1,52 @@
+// registry_push copies a saved container image archive to a registry. It exists
+// for the Kubernetes test harness so an HTTP test registry does not have to be
+// added to the runner machine's Docker daemon configuration.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/google/go-containerregistry/pkg/authn"
+	"github.com/google/go-containerregistry/pkg/name"
+	"github.com/google/go-containerregistry/pkg/v1/remote"
+	"github.com/google/go-containerregistry/pkg/v1/tarball"
+)
+
+func main() {
+	insecure := flag.Bool("insecure", false, "push to the registry over plain HTTP")
+	tarPath := flag.String("tar", "", "path to an image archive produced by docker save")
+	flag.Parse()
+	if flag.NArg() != 1 || *tarPath == "" {
+		fmt.Fprintln(os.Stderr, "usage: registry_push [--insecure] --tar PATH IMAGE")
+		os.Exit(2)
+	}
+
+	imageName := flag.Arg(0)
+	source, err := name.NewTag(imageName)
+	if err != nil {
+		fatalf("parse source image reference: %v", err)
+	}
+	image, err := tarball.ImageFromPath(*tarPath, &source)
+	if err != nil {
+		fatalf("read image archive: %v", err)
+	}
+
+	var nameOptions []name.Option
+	if *insecure {
+		nameOptions = append(nameOptions, name.Insecure)
+	}
+	destination, err := name.ParseReference(imageName, nameOptions...)
+	if err != nil {
+		fatalf("parse destination image reference: %v", err)
+	}
+	if err := remote.Write(destination, image, remote.WithAuth(authn.Anonymous)); err != nil {
+		fatalf("push image: %v", err)
+	}
+}
+
+func fatalf(format string, args ...any) {
+	fmt.Fprintf(os.Stderr, format+"\n", args...)
+	os.Exit(1)
+}