From 2f3eabc3ca81db723ab178d7261a9ee17bd8b38c Mon Sep 17 00:00:00 2001
From: Ettore Di Giacinto <mudler@gentoo.org>
Date: Sun, 12 Apr 2020 14:37:49 +0200
Subject: [PATCH] Annotate git hash and time in displayed version

---
 Makefile    | 11 ++++++++---
 cmd/root.go | 10 +++++++++-
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/Makefile b/Makefile
index 8952a902..aef1487b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,8 @@
+
+# go tool nm ./luet | grep Commit
+LDFLAGS += -X "github.com/mudler/luet/cmd.BuildTime=$(shell date -u '+%Y-%m-%d %I:%M:%S %Z')"
+LDFLAGS += -X "github.com/mudler/luet/cmd.BuildCommit=$(shell git rev-parse HEAD)"
+
 NAME ?= luet
 PACKAGE_NAME ?= $(NAME)
 PACKAGE_CONFLICT ?= $(PACKAGE_NAME)-beta
@@ -59,7 +64,7 @@ deps:
 
 .PHONY: build
 build:
-	CGO_ENABLED=0 go build
+	CGO_ENABLED=0 go build -ldflags '$(LDFLAGS)'
 
 .PHONY: image
 image:
@@ -67,7 +72,7 @@ image:
 
 .PHONY: gox-build
 gox-build:
-	CGO_ENABLED=0 gox $(BUILD_PLATFORMS) -output="release/$(NAME)-$(VERSION)-{{.OS}}-{{.Arch}}"
+	CGO_ENABLED=0 gox $(BUILD_PLATFORMS) -ldflags '$(LDFLAGS)' -output="release/$(NAME)-$(VERSION)-{{.OS}}-{{.Arch}}"
 
 .PHONY: lint
 lint:
@@ -85,4 +90,4 @@ test-docker:
 
 .PHONY: multiarch-build
 multiarch-build:
-	gox $(BUILD_PLATFORMS) -output="release/$(NAME)-$(VERSION)-{{.OS}}-{{.Arch}}"
+	gox $(BUILD_PLATFORMS) -ldflags '$(LDFLAGS)' -output="release/$(NAME)-$(VERSION)-{{.OS}}-{{.Arch}}"
diff --git a/cmd/root.go b/cmd/root.go
index 4b3835db..59521523 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -42,12 +42,20 @@ const (
 	LuetEnvPrefix  = "LUET"
 )
 
+// Build time and commit information.
+//
+// ⚠️ WARNING: should only be set by "-ldflags".
+var (
+	BuildTime   string
+	BuildCommit string
+)
+
 // RootCmd represents the base command when called without any subcommands
 var RootCmd = &cobra.Command{
 	Use:     "luet",
 	Short:   "Package manager for the XXth century!",
 	Long:    `Package manager which uses containers to build packages`,
-	Version: LuetCLIVersion,
+	Version: fmt.Sprintf("%s-g%s %s", LuetCLIVersion, BuildCommit, BuildTime),
 	PersistentPreRun: func(cmd *cobra.Command, args []string) {
 		err := LoadConfig(config.LuetCfg)
 		if err != nil {