Display the current git revision in the info block

Change-Id: I9737cc680968033ba82c95bb04cc482fcaa12642
PiperOrigin-RevId: 196192683

runsc/BUILD

@@ -8,6 +8,7 @@ go_binary(
         "main.go",
     ],
     pure = "on",
+    x_defs = {"main.gitRevision": "{GIT_REVISION}"},
     deps = [
         "//pkg/log",
         "//runsc/boot",

runsc/main.go

@@ -61,6 +61,8 @@ var (
 	overlay    = flag.Bool("overlay", false, "wrap filesystem mounts with writable overlay. All modifications are stored in memory inside the sandbox.")
 )
 
+var gitRevision = ""
+
 func main() {
 	// Help and flags commands are generated automatically.
 	subcommands.Register(subcommands.HelpCommand(), "")
@@ -166,6 +168,7 @@ func main() {
 
 	log.Infof("***************************")
 	log.Infof("Args: %s", os.Args)
+	log.Infof("Git Revision: %s", gitRevision)
 	log.Infof("PID: %d", os.Getpid())
 	log.Infof("UID: %d, GID: %d", os.Getuid(), os.Getgid())
 	log.Infof("Configuration:")

tools/bazel.rc

@@ -0,0 +1 @@
+build --workspace_status_command tools/workspace_status.sh

tools/workspace_status.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# Copyright 2018 Google Inc.
+#
+# 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.
+
+echo GIT_REVISION $(git describe --always --abbrev=40 --dirty)