From 276938350309e71564836acd29634c97f532af2f Mon Sep 17 00:00:00 2001
From: Kaushal M <kshlmster@gmail.com>
Date: Thu, 22 Sep 2016 14:31:15 +0530
Subject: [PATCH 1/2] Add a script to generate version strings

Taken from the GlusterFS source
(${glusterfs-src}/build-aux/pkg-version).
---
 scripts/pkg-version | 52 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100755 scripts/pkg-version

diff --git a/scripts/pkg-version b/scripts/pkg-version
new file mode 100755
index 000000000..83d4a5f91
--- /dev/null
+++ b/scripts/pkg-version
@@ -0,0 +1,52 @@
+#!/bin/sh
+
+# To override version/release from git,
+# create VERSION file containing text with version/release
+# eg. v3.4.0-1
+PKG_VERSION=`cat VERSION 2> /dev/null || git describe --tags --match "v[0-9]*"`
+
+get_version()
+{
+    # tags and output versions:
+    #   - v3.4.0   => 3.4.0 (upstream clean)
+    #   - v3.4.0-1 => 3.4.0 (downstream clean)
+    #   - v3.4.0-2-g34e62f   => 3.4.0 (upstream dirty)
+    #   - v3.4.0-1-2-g34e62f => 3.4.0 (downstream dirty)
+    AWK_VERSION='
+    BEGIN { FS="-" }
+    /^v[0-9]/ {
+      sub(/^v/,"") ; print $1
+    }'
+
+    echo $PKG_VERSION | awk "$AWK_VERSION" | tr -cd '[:alnum:].'
+}
+
+get_release()
+{
+    # tags and output releases:
+    #   - v3.4.0   => 0 (upstream clean)
+    #   - v3.4.0-1 => 1 (downstream clean)
+    #   - v3.4.0-2-g34e62f1   => 2.git34e62f1 (upstream dirty)
+    #   - v3.4.0-1-2-g34e62f1 => 1.2.git34e62f1 (downstream dirty)
+    AWK_RELEASE='
+    BEGIN { FS="-"; OFS="." }
+    /^v[0-9]/ {
+      if (NF == 1) print 0
+      else if (NF == 2) print $2
+      else if (NF == 3) print $2, "git" substr($3, 2)
+      else if (NF == 4) print $2, $3, "git" substr($4, 2)
+    }'
+
+    echo $PKG_VERSION | awk "$AWK_RELEASE" | tr -cd '[:alnum:].'
+}
+
+if test "x$1" = "x--full"; then
+    echo -n "v$(get_version)-$(get_release)"
+elif test "x$1" = "x--version"; then
+    get_version
+elif test "x$1" = "x--release"; then
+    get_release
+else
+    echo "usage: $0 [--full|--version|--release]"
+    exit 1
+fi

From 20cf5455332ac0418c7b1b13dd1cd894171f45ba Mon Sep 17 00:00:00 2001
From: Kaushal M <kshlmster@gmail.com>
Date: Thu, 22 Sep 2016 14:57:19 +0530
Subject: [PATCH 2/2] Set version when compiling

---
 Makefile        |  7 +++++--
 gdctx/global.go |  7 +++++--
 main.go         | 13 ++++++++++---
 version.go      | 18 ++++++++++++++++++
 4 files changed, 38 insertions(+), 7 deletions(-)
 create mode 100644 version.go

diff --git a/Makefile b/Makefile
index 6adb08fe3..420e9ccd6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,6 @@
+VERSION := $(shell bash ./scripts/pkg-version --full)
+LDFLAGS := '-X github.com/gluster/glusterd2/gdctx.GlusterdVersion=$(VERSION)'
+
 .PHONY: all build check check-go check-reqs install vendor-update verify
 
 all: build
@@ -16,12 +19,12 @@ check-reqs:
 
 glusterd2:
 	@echo Building GlusterD-2.0
-	@GO15VENDOREXPERIMENT=1 go build
+	@GO15VENDOREXPERIMENT=1 go build -ldflags $(LDFLAGS)
 	@echo
 
 install:
 	@echo Building and installing GlusterD-2.0
-	@GO15VENDOREXPERIMENT=1 go install
+	@GO15VENDOREXPERIMENT=1 go install -ldflags $(LDFLAGS)
 	@echo
 
 vendor-update:
diff --git a/gdctx/global.go b/gdctx/global.go
index 66d9b1006..12eca99ed 100644
--- a/gdctx/global.go
+++ b/gdctx/global.go
@@ -20,8 +20,11 @@ import (
 
 // Various version constants that will be used by GD2
 const (
-	MaxOpVersion    = 40000
-	APIVersion      = 1
+	MaxOpVersion = 40000
+	APIVersion   = 1
+)
+
+var (
 	GlusterdVersion = "4.0-dev"
 )
 
diff --git a/main.go b/main.go
index fd942ff6a..e5f26925d 100644
--- a/main.go
+++ b/main.go
@@ -17,13 +17,20 @@ import (
 )
 
 func main() {
-	log.WithField("pid", os.Getpid()).Info("GlusterD starting")
-
-	// Parse flags and set up logging before continuing
+	// Parse flags and handle version and logging before continuing
 	parseFlags()
+
+	showvers, _ := flag.CommandLine.GetBool("version")
+	if showvers {
+		dumpVersionInfo()
+		return
+	}
+
 	logLevel, _ := flag.CommandLine.GetString("loglevel")
 	initLog(logLevel, os.Stderr)
 
+	log.WithField("pid", os.Getpid()).Info("GlusterD starting")
+
 	// Read in config
 	confFile, _ := flag.CommandLine.GetString("config")
 	initConfig(confFile)
diff --git a/version.go b/version.go
new file mode 100644
index 000000000..e682bbcd3
--- /dev/null
+++ b/version.go
@@ -0,0 +1,18 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/gluster/glusterd2/gdctx"
+
+	flag "github.com/spf13/pflag"
+)
+
+func init() {
+	//Register the `--version` flag
+	flag.Bool("version", false, "Show the version information")
+}
+
+func dumpVersionInfo() {
+	fmt.Println(gdctx.GlusterdVersion)
+}