build.bash: bake the go-fuse commit hash into the binaries

build.bash

@@ -4,17 +4,20 @@ set -eu
 
 cd "$(dirname "$0")"
 
+# gocryptfs version according to git
 GITVERSION=$(git describe --tags --dirty)
+# go-fuse version according to git
+GITVERSIONFUSE=$(git -C $GOPATH/src/github.com/hanwen/go-fuse rev-parse --short HEAD)
 
 # go version go1.5.1 linux/amd64
 V=$(go version | cut -d" " -f3 | cut -c3-5)
 
 if [ $V == "1.3" -o $V == "1.4" ]
 then
-	go build -ldflags="-X main.GitVersion $GITVERSION"
+	go build -ldflags="-X main.GitVersion $GITVERSION -X main.GitVersionFuse $GITVERSIONFUSE"
 else
 	# Go 1.5 wants an "=" here
-	go build -ldflags="-X main.GitVersion=$GITVERSION"
+	go build -ldflags="-X main.GitVersion=$GITVERSION -X main.GitVersionFuse=$GITVERSIONFUSE"
 fi
 
 ./gocryptfs -version

main.go

@@ -52,6 +52,7 @@ var flagSet *flag.FlagSet
 
 // GitVersion will be set by the build script "build.bash"
 var GitVersion = "[version not set - please compile using ./build.bash]"
+var GitVersionFuse = "[version not set - please compile using ./build.bash]"
 
 func initDir(args *argContainer) {
 	err := checkDirEmpty(args.cipherdir)
@@ -137,7 +138,8 @@ func changePassword(args *argContainer) {
 // printVersion - print a version string like
 // "gocryptfs v0.3.1-31-g6736212-dirty; on-disk format 2"
 func printVersion() {
-	fmt.Printf("%s %s; on-disk format %d\n", toggledlog.ProgramName, GitVersion, contentenc.CurrentVersion)
+	fmt.Printf("%s %s; on-disk format %d; go-fuse %s\n",
+		toggledlog.ProgramName, GitVersion, contentenc.CurrentVersion, GitVersionFuse)
 }
 
 func main() {