Merge pull request kelseyhightower#445 from mountkin/version-enhancement

add go version and git commit sha1 to version string

build

@@ -2,4 +2,10 @@
 
 echo "Building confd..."
 mkdir -p bin
-go build -o bin/confd .
+
+GIT_COMMIT=$(git rev-parse --short HEAD)
+if [ -n "$(git status --porcelain --untracked-files=no)" ]; then
+  GIT_COMMIT=${GIT_COMMIT}-dirty
+fi
+
+go build -ldflags "-X main.GitCommit=$GIT_COMMIT" -o bin/confd .

confd.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"os"
 	"os/signal"
+	"runtime"
 	"syscall"
 
 	"github.com/kelseyhightower/confd/backends"
@@ -15,7 +16,7 @@ import (
 func main() {
 	flag.Parse()
 	if printVersion {
-		fmt.Printf("confd %s\n", Version)
+		fmt.Printf("confd %s (Git commit: %s, Go version: %s)\n", Version, GitCommit, runtime.Version())
 		os.Exit(0)
 	}
 	if err := initConfig(); err != nil {

version.go

@@ -1,3 +1,6 @@
 package main
 
 const Version = "0.14.0-dev"
+
+// We want to replace this variable at build time with "-ldflags -X main.GitCommit=xxx", where const is not supported.
+var GitCommit = ""