Allow push to use the image id

Signed-off-by: TomSweeneyRedHat <tsweeney@redhat.com>

Closes: #341
Approved by: nalind

commit.go

@@ -314,7 +314,7 @@ func Push(image string, dest types.ImageReference, options PushOptions) error {
 		return errors.Wrap(err, "error importing builder information from image")
 	}
 	// Look up the image name and its layer.
-	ref, err := is.Transport.ParseStoreReference(options.Store, image)
+	ref, err := is.Transport.ParseStoreReference(options.Store, builder.FromImage)
 	if err != nil {
 		return errors.Wrapf(err, "error parsing reference to image %q", image)
 	}

contrib/rpm/buildah.spec

@@ -43,6 +43,7 @@ BuildRequires:  btrfs-progs-devel
 BuildRequires:  libassuan-devel
 BuildRequires:  glib2-devel
 BuildRequires:  ostree-devel
+BuildRequires:  make
 Requires:       runc >= 1.0.0-6
 Requires:       container-selinux
 Requires:       skopeo-containers

tests/push.bats

@@ -38,3 +38,14 @@ load helpers
   buildah rmi alpine
   rm -rf my-dir
 }
+
+@test "push with imageid" {
+  cid=$(buildah from --pull --signature-policy ${TESTSDIR}/policy.json alpine)
+  imageid=$(buildah images -q)
+  run buildah push --signature-policy ${TESTSDIR}/policy.json $imageid dir:my-dir
+  echo "$output"
+  [ "$status" -eq 0 ]
+  buildah rm "$cid"
+  buildah rmi alpine
+  rm -rf my-dir
+}