runsc: add a bazel target to build a debian package

$ dpkg -s runsc
Package: runsc
Status: install ok installed
Priority: optional
Section: contrib/devel
Maintainer: The gVisor Authors <gvisor-dev@googlegroups.com>
Architecture: amd64
Version: 20190304.1-123-g861434f612ce-dirty
Description: gVisor is a user-space kernel, written in Go, that
 implements a substantial portion of the Linux system surface. It
 includes an Open Container Initiative (OCI) runtime called runsc that
 provides an isolation boundary between the application and the host
 kernel. The runsc runtime integrates with Docker and Kubernetes,
 making it simple to run sandboxed containers.
Homepage: https://gvisor.dev/
Built-Using: Bazel
Change-Id: I6f161de8fba649f12272a87b99529ccfd22e499a
PiperOrigin-RevId: 246546294

runsc/BUILD

@@ -1,6 +1,7 @@
 package(licenses = ["notice"])  # Apache 2.0
 
 load("@io_bazel_rules_go//go:def.bzl", "go_binary")
+load("@bazel_tools//tools/build_defs/pkg:pkg.bzl", "pkg_deb", "pkg_tar")
 
 go_binary(
     name = "runsc",
@@ -52,3 +53,47 @@ go_binary(
         "@com_github_google_subcommands//:go_default_library",
     ],
 )
+
+pkg_tar(
+    name = "runsc-bin",
+    srcs = [":runsc"],
+    mode = "0755",
+    package_dir = "/usr/bin",
+    strip_prefix = "/runsc/linux_amd64_pure_stripped",
+)
+
+pkg_tar(
+    name = "runsc-tools",
+    srcs = ["//runsc/tools/dockercfg"],
+    mode = "0755",
+    package_dir = "/usr/libexec/runsc",
+    strip_prefix = "/runsc/tools/dockercfg/linux_amd64_stripped",
+)
+
+pkg_tar(
+    name = "debian-data",
+    extension = "tar.gz",
+    deps = [
+        ":runsc-bin",
+        ":runsc-tools",
+    ],
+)
+
+genrule(
+    name = "deb-version",
+    outs = ["version.txt"],
+    cmd = "cat bazel-out/volatile-status.txt | grep VERSION | sed 's/^[^0-9]*//' >$@",
+    stamp = 1,
+)
+
+pkg_deb(
+    name = "runsc-debian",
+    architecture = "amd64",
+    data = ":debian-data",
+    description_file = "debian/description",
+    homepage = "https://gvisor.dev/",
+    maintainer = "The gVisor Authors <gvisor-dev@googlegroups.com>",
+    package = "runsc",
+    postinst = "debian/postinst.sh",
+    version_file = ":version.txt",
+)

runsc/debian/description

@@ -0,0 +1,5 @@
+gVisor is a user-space kernel, written in Go, that implements a substantial
+portion of the Linux system surface. It includes an Open Container Initiative
+(OCI) runtime called runsc that provides an isolation boundary between the
+application and the host kernel. The runsc runtime integrates with Docker and
+Kubernetes, making it simple to run sandboxed containers.

runsc/debian/postinst.sh

@@ -0,0 +1,24 @@
+#!/bin/sh -e
+
+# Copyright 2019 The gVisor Authors.
+#
+# 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.
+
+if [ "$1" != configure ]; then
+    exit 0
+fi
+
+if [ -f /etc/docker/daemon.json ]; then
+	/usr/libexec/runsc/dockercfg runtime-add runsc /usr/bin/runsc
+	systemctl restart docker
+fi

runsc/tools/dockercfg/BUILD

@@ -5,8 +5,6 @@ package(licenses = ["notice"])
 go_binary(
     name = "dockercfg",
     srcs = ["dockercfg.go"],
-    visibility = [
-        "//runsc/test:__subpackages__",
-    ],
+    visibility = ["//visibility:public"],
     deps = ["@com_github_google_subcommands//:go_default_library"],
 )