output git hash in --version

have to do the indirection because setting -X variables in the
internal package doesn't seem to work

Author: kahing

Makefile

@@ -6,3 +6,6 @@ s3proxy.jar:
 
 get-deps: s3proxy.jar
 	go get -t ./...
+
+build:
+	go build -ldflags "-X main.Version=`git rev-parse HEAD`"

internal/flags.go

@@ -69,12 +69,14 @@ COPYRIGHT:
 `
 }
 
+var VersionHash string
+
 func NewApp() (app *cli.App) {
 	uid, gid := MyUserAndGroup()
 
 	app = &cli.App{
 		Name:     "goofys",
-		Version:  "0.0.12",
+		Version:  "0.0.12-" + VersionHash,
 		Usage:    "Mount an S3 bucket locally",
 		HideHelp: true,
 		Writer:   os.Stderr,

main.go

@@ -170,7 +170,11 @@ func massageArg0() {
 	}
 }
 
+var Version string
+
 func main() {
+	VersionHash = Version
+
 	app := NewApp()
 
 	var flags *FlagStorage