sbctl: implement a hidden version command

Signed-off-by: Morten Linderud <morten@linderud.pw>

.gitignore

@@ -3,3 +3,4 @@ releases/*
 /sbctl
 docs/*.8
 rootfs*
+VERSION

Makefile

@@ -11,6 +11,10 @@ GOFLAGS ?= -buildmode=pie -trimpath
 
 TAG = $(shell git describe --abbrev=0 --tags)
 
+GIT_DESCRIBE = $(shell git describe | sed 's/-/./g;s/^v//;')
+
+VERSION = $(shell if test -f VERSION; then cat VERSION; else echo -n $(GIT_DESCRIBE) ; fi)
+
 all: man build
 build: sbctl
 man: $(MANS)
@@ -21,7 +25,7 @@ docs/sbctl.%: docs/sbctl.%.txt docs/asciidoc.conf
 
 .PHONY: sbctl
 sbctl:
-	go build -o $@ ./cmd/$@
+	go build -ldflags="-X github.com/foxboron/sbctl.Version=$(VERSION)" -o $@ ./cmd/$@
 
 .PHONY: completions
 completions: sbctl
@@ -42,8 +46,9 @@ install: sbctl completions man
 
 .PHONY: release
 release:
+	echo -n "$(GIT_DESCRIBE)" > VERSION
 	mkdir -p releases
-	git archive --prefix=${PROGNM}-${TAG}/ -o releases/${PROGNM}-${TAG}.tar.gz ${TAG};
+	git archive --prefix=${PROGNM}-${TAG}/ --add-file=VERSION -o releases/${PROGNM}-${TAG}.tar.gz ${TAG};
 	gpg --detach-sign -o releases/${PROGNM}-${TAG}.tar.gz.sig releases/${PROGNM}-${TAG}.tar.gz
 	gh release upload ${TAG} releases/${PROGNM}-${TAG}.tar.gz.sig releases/${PROGNM}-${TAG}.tar.gz ${TAG}
 

cmd/sbctl/version.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/foxboron/sbctl"
+	"github.com/spf13/cobra"
+)
+
+var (
+	versionCmd = &cobra.Command{
+		Use:    "version",
+		Short:  "Print sbctl version",
+		Hidden: true,
+		Run: func(cmd *cobra.Command, args []string) {
+			fmt.Println(sbctl.Version)
+		},
+	}
+)
+
+func init() {
+	CliCommands = append(CliCommands, cliCommand{
+		Cmd: versionCmd,
+	})
+}

sbctl.go

@@ -20,6 +20,7 @@ import (
 
 var (
 	DatabasePath = "/usr/share/secureboot/"
+	Version      = "unknown"
 )
 
 // Functions that doesn't fit anywhere else