Add release hook and version flag

PiperOrigin-RevId: 241421671
Change-Id: Ic0cebfe3efd458dc42c49f7f812c13318705199a

4 files changed, 36 insertions, 6 deletions

diff --git a/runsc/BUILD b/runsc/BUILD
index e390b7bae..eb7503502 100644
--- a/runsc/BUILD
+++ b/runsc/BUILD
@@ -6,12 +6,13 @@ go_binary(
     name = "runsc",
     srcs = [
         "main.go",
+        "version.go",
     ],
     pure = "on",
     visibility = [
         "//visibility:public",
     ],
-    x_defs = {"main.gitRevision": "{GIT_REVISION}"},
+    x_defs = {"main.version": "{VERSION}"},
     deps = [
         "//pkg/log",
         "//runsc/boot",
@@ -36,12 +37,13 @@ go_binary(
     name = "runsc-race",
     srcs = [
         "main.go",
+        "version.go",
     ],
     static = "on",
     visibility = [
         "//visibility:public",
     ],
-    x_defs = {"main.gitRevision": "{GIT_REVISION}"},
+    x_defs = {"main.version": "{VERSION}"},
     deps = [
         "//pkg/log",
         "//runsc/boot",
diff --git a/runsc/main.go b/runsc/main.go
index 4b3f55ad1..bbf08228c 100644
--- a/runsc/main.go
+++ b/runsc/main.go
@@ -18,6 +18,7 @@ package main
 
 import (
 	"context"
+	"fmt"
 	"io"
 	"os"
 	"path/filepath"
@@ -40,6 +41,7 @@ var (
 	logFilename = flag.String("log", "", "file path where internal debug information is written, default is stdout")
 	logFormat   = flag.String("log-format", "text", "log format: text (default), json, or json-k8s")
 	debug       = flag.Bool("debug", false, "enable debug logging")
+	showVersion = flag.Bool("version", false, "show version and exit")
 
 	// These flags are unique to runsc, and are used to configure parts of the
 	// system that are not covered by the runtime spec.
@@ -69,9 +71,6 @@ var (
 	testOnlyAllowRunAsCurrentUserWithoutChroot = flag.Bool("TESTONLY-unsafe-nonroot", false, "TEST ONLY; do not ever use! This skips many security measures that isolate the host from the sandbox.")
 )
 
-// gitRevision is set during linking.
-var gitRevision = ""
-
 func main() {
 	// Help and flags commands are generated automatically.
 	subcommands.Register(subcommands.HelpCommand(), "")
@@ -107,6 +106,14 @@ func main() {
 	// All subcommands must be registered before flag parsing.
 	flag.Parse()
 
+	// Are we showing the version?
+	if *showVersion {
+		// The format here is the same as runc.
+		fmt.Fprintf(os.Stdout, "runsc version %s\n", version)
+		fmt.Fprintf(os.Stdout, "spec: %s\n", specutils.Version)
+		os.Exit(0)
+	}
+
 	platformType, err := boot.MakePlatformType(*platform)
 	if err != nil {
 		cmd.Fatalf("%v", err)
@@ -215,7 +222,7 @@ func main() {
 
 	log.Infof("***************************")
 	log.Infof("Args: %s", os.Args)
-	log.Infof("Git Revision: %s", gitRevision)
+	log.Infof("Version %s", version)
 	log.Infof("PID: %d", os.Getpid())
 	log.Infof("UID: %d, GID: %d", os.Getuid(), os.Getgid())
 	log.Infof("Configuration:")
diff --git a/runsc/specutils/specutils.go b/runsc/specutils/specutils.go
index cbf099c64..af8d34535 100644
--- a/runsc/specutils/specutils.go
+++ b/runsc/specutils/specutils.go
@@ -38,6 +38,9 @@ import (
 // changed in tests that aren't linked in the same binary.
 var ExePath = "/proc/self/exe"
 
+// Version is the supported spec version.
+var Version = specs.Version
+
 // LogSpec logs the spec in a human-friendly way.
 func LogSpec(spec *specs.Spec) {
 	log.Debugf("Spec: %+v", spec)
diff --git a/runsc/version.go b/runsc/version.go
new file mode 100644
index 000000000..4894f2de6
--- /dev/null
+++ b/runsc/version.go
@@ -0,0 +1,18 @@
+// Copyright 2019 Google LLC
+//
+// 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.
+
+package main
+
+// version is set during linking.
+var version = ""