unify bazel's docker build targets with other istio repos

WORKSPACE

@@ -85,3 +85,11 @@ docker_build(
     type = "zip",
     url = "https://codeload.github.com/tianon/docker-brew-ubuntu-core/zip/e406914e5f648003dfe8329b512c30c9ad0d2f9c",
 )
+
+# See github.com/istio/manager/blob/master/docker/debug/build-and-publish-debug-image.sh
+# for instructions on how to re-build and publish this base image layer.
+http_file(
+    name = "ubuntu_xenial_debug",
+    url = "https://storage.googleapis.com/istio-build/manager/ubuntu_xenial_debug.tar.gz",
+    sha256 = "02f0ea4b04012562dec4b75ee4337ac77a0003418d02a91bde1b4b4d162a41e4",
+)

docker/BUILD

@@ -0,0 +1,11 @@
+# Add aliases for envoy specific targets so that the docker build
+# targets are consistent for all istio repos, e.g. //docker:<image>
+alias(
+    name = "proxy",
+    actual = "//src/envoy/mixer:proxy",
+)
+
+alias(
+    name = "proxy_debug",
+    actual = "//src/envoy/mixer:proxy_debug",
+)

src/envoy/mixer/BUILD

@@ -15,8 +15,9 @@
 ################################################################################
 #
 
+
 load("@bazel_tools//tools/build_defs/pkg:pkg.bzl", "pkg_tar")
-load("@bazel_tools//tools/build_defs/docker:docker.bzl", "docker_build")
+load("//src/envoy/mixer:proxy_docker.bzl", "proxy_docker_build")
 load("@protobuf_git//:protobuf.bzl", "cc_proto_library")
 
 cc_proto_library(
@@ -79,9 +80,11 @@ pkg_tar(
     tags = ["manual"],
 )
 
-docker_build(
-    name = "proxy",
-    base = "@docker_ubuntu//:xenial",
+proxy_docker_build(
+    images = [
+        {"name": "proxy",       "base": "@docker_ubuntu//:xenial"},
+        {"name": "proxy_debug", "base": "@ubuntu_xenial_debug//file"},
+    ],
     entrypoint = [
         "/usr/local/bin/start_envoy",
         "-e",
@@ -99,4 +102,5 @@ docker_build(
         ":envoy_tar",
         ":start_envoy_tar",
     ],
+    visibility = ["//visibility:public"],
 )

src/envoy/mixer/proxy_docker.bzl

@@ -0,0 +1,9 @@
+load("@bazel_tools//tools/build_defs/docker:docker.bzl", "docker_build")
+
+def proxy_docker_build(images, **kwargs):
+    for image in images:
+        docker_build(
+            name = image['name'],
+            base = image['base'],
+            **kwargs
+        )