From f3a37bc67afcf50cd8765048343e92e6ccbf1082 Mon Sep 17 00:00:00 2001
From: "James O. D. Hunt" <james.o.hunt@intel.com>
Date: Wed, 10 Jun 2020 11:24:46 +0100
Subject: [PATCH] shimv2: Add a "--version" cli option

All components should support a `--version` option to allow clear
identification of the version of the component being used.

Note that the build changes are required to allow the shim binary to
access the golang code generated by the build (such as the `version`
variable).

Fixes: #307.

Signed-off-by: James O. D. Hunt <james.o.hunt@intel.com>
---
 src/runtime/Makefile                            |  5 ++++-
 src/runtime/cli/containerd-shim-kata-v2/main.go | 13 ++++++++++++-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/runtime/Makefile b/src/runtime/Makefile
index ea81aeef2..819833e03 100644
--- a/src/runtime/Makefile
+++ b/src/runtime/Makefile
@@ -553,14 +553,16 @@ define MAKE_KERNEL_VIRTIOFS_NAME
 $(if $(findstring uncompressed,$1),vmlinux-virtiofs.container,vmlinuz-virtiofs.container)
 endef
 
+GENERATED_CONFIG = $(abspath $(CLI_DIR)/config-generated.go)
 
-GENERATED_FILES += $(CLI_DIR)/config-generated.go
+GENERATED_FILES += $(GENERATED_CONFIG)
 GENERATED_FILES += pkg/katautils/config-settings.go
 
 $(TARGET_OUTPUT): $(SOURCES) $(GENERATED_FILES) $(MAKEFILE_LIST) | show-summary
 	$(QUIET_BUILD)(cd $(CLI_DIR) && go build $(KATA_LDFLAGS) $(BUILDFLAGS) -o $@ .)
 
 $(SHIMV2_OUTPUT): $(SOURCES) $(GENERATED_FILES) $(MAKEFILE_LIST)
+	$(QUIET_BUILD)(cd $(SHIMV2_DIR)/ && ln -fs $(GENERATED_CONFIG))
 	$(QUIET_BUILD)(cd $(SHIMV2_DIR)/ && go build $(KATA_LDFLAGS) $(BUILDFLAGS) -o $@ .)
 
 .PHONY: \
@@ -710,6 +712,7 @@ clean:
 		$(GENERATED_FILES) \
 		$(NETMON_TARGET) \
 		$(SHIMV2) \
+		$(SHIMV2_DIR)/$(notdir $(GENERATED_CONFIG)) \
 		$(TARGET) \
 		.git-commit .git-commit.tmp
 
diff --git a/src/runtime/cli/containerd-shim-kata-v2/main.go b/src/runtime/cli/containerd-shim-kata-v2/main.go
index b04412d1d..7ffa0dff6 100644
--- a/src/runtime/cli/containerd-shim-kata-v2/main.go
+++ b/src/runtime/cli/containerd-shim-kata-v2/main.go
@@ -6,15 +6,26 @@
 package main
 
 import (
+	"fmt"
+	"os"
+
 	"github.com/containerd/containerd/runtime/v2/shim"
 	"github.com/kata-containers/kata-containers/src/runtime/containerd-shim-v2"
 )
 
+const shim_id = "io.containerd.kata.v2"
+
 func shimConfig(config *shim.Config) {
 	config.NoReaper = true
 	config.NoSubreaper = true
 }
 
 func main() {
-	shim.Run("io.containerd.kata.v2", containerdshim.New, shimConfig)
+
+	if len(os.Args) == 2 && os.Args[1] == "--version" {
+		fmt.Printf("%s containerd shim: id: %q, version: %s, commit: %v\n", project, shim_id, version, commit)
+		os.Exit(0)
+	}
+
+	shim.Run(shim_id, containerdshim.New, shimConfig)
 }