lvh: add version sub-command

Signed-off-by: Kornilios Kourtis <[email protected]>

Makefile

@@ -2,6 +2,12 @@ GO ?= go
 
 OCIREPO ?= quay.io/lvh-images/lvh
 DOCKER ?= docker
+VERSION ?= $(shell git describe --tags --always --long)
+
+GO_BUILD_LDFLAGS =
+GO_BUILD_LDFLAGS += -X 'github.com/cilium/little-vm-helper/pkg/version.Version=$(VERSION)'
+GO_BUILD_FLAGS += -ldflags "$(GO_BUILD_LDFLAGS)"
+
 
 all: tests little-vm-helper
 
@@ -10,7 +16,7 @@ tests:
 	$(GO) test -cover ./...
 
 little-vm-helper: FORCE
-	CGO_ENABLED=0 $(GO) build ./cmd/lvh
+	CGO_ENABLED=0 $(GO) build $(GO_BUILD_FLAGS) ./cmd/lvh
 
 .PHONY: image
 image:

cmd/lvh/main.go

@@ -4,11 +4,13 @@
 package main
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/cilium/little-vm-helper/cmd/lvh/images"
 	"github.com/cilium/little-vm-helper/cmd/lvh/kernels"
 	"github.com/cilium/little-vm-helper/cmd/lvh/runner"
+	"github.com/cilium/little-vm-helper/pkg/version"
 
 	"github.com/spf13/cobra"
 )
@@ -26,6 +28,13 @@ func init() {
 		images.ImagesCommand(),
 		kernels.KernelsCommand(),
 		runner.RunCommand(),
+		&cobra.Command{
+			Use:   "version",
+			Short: "version",
+			Run: func(cmd *cobra.Command, args []string) {
+				fmt.Println(version.Version)
+			},
+		},
 	)
 }
 

pkg/version/version.go

@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright Authors of Cilium
+
+package version
+
+var Version string