Implement basic image push

Pushes all images built with build-image. This requires a --prefix
option to be specified since that is the user (or organization) to
which we push and helps to identify the local images.

Change-Id: I13eee575c329deb58285f9cc913be298b43bb438

pbrx/cmd/main.py

@@ -115,6 +115,16 @@ def main():
             " http://dl-cdn.alpinelinux.org/alpine"),
     )
 
+    cmd_push = subparsers.add_parser(
+        "push-images", help="push project container images to a repository"
+    )
+    cmd_push.set_defaults(func=container_images.push)
+    cmd_push.add_argument(
+        "--prefix",
+        help="Organization prefix container images will be published to",
+        required=True
+    )
+
     args = parser.parse_args()
     setup_logging(args.log_config, args.debug)
 

pbrx/container_images.py

@@ -314,3 +314,22 @@ def build(args):
             ) as cont:
                 cont.run(
                     "chown -R {uid} /root/.cache/pip".format(uid=os.getuid()))
+
+
+def push(args):
+    '''Push any built images to the registry.
+
+    The images built by pbrx's build-image command should already be named
+    with a prefix (the repository name to push to). It is expected that
+    we are already logged in to the registry as the user that owns the
+    repository.
+    '''
+    info = ProjectInfo()
+
+    unprefixed_image_names = info.scripts.copy()
+    unprefixed_image_names.add(info.base_container)
+
+    for image in unprefixed_image_names:
+        image = "/".join([args.prefix, image])
+        log.info("Pushing {image}".format(image=image))
+        sh.docker.push(image)

releasenotes/notes/push-images-09c0da9bc9c2cc91.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Added new push-images command to push any images built by the build-images
+    command.