Add version and built info

Use current GIT commit ID and built info (time and machine) for versioning purpose

Makefile

@@ -3,10 +3,14 @@
 
 export GOPATH=$(PWD)/_gopath
 
+GITCOMMIT=`git rev-parse --short HEAD`
+BUILDTIME=`date +%FT%T%z`
+HOSTNAME=`hostname`
+
 all: hdfs-mount 
 
 hdfs-mount: *.go $(GOPATH)/src/bazil.org/fuse $(GOPATH)/src/github.com/colinmarc/hdfs $(GOPATH)/src/golang.org/x/net/context $(GOPATH)/src/github.com/golang/protobuf/proto
-	go build -o hdfs-mount
+	go build -ldflags="-w -X main.GITCOMMIT=${GITCOMMIT} -X main.BUILDTIME=${BUILDTIME} -X main.HOSTNAME=${HOSTNAME}" -o hdfs-mount
 
 $(GOPATH)/src/bazil.org/fuse: $(GOPATH)/src/github.com/bazil/fuse
 	ln -s $(GOPATH)/src/github.com/bazil $(GOPATH)/src/bazil.org

Version.go

@@ -0,0 +1,15 @@
+package main
+
+var (
+	//TODO: Add Version tag, manually update
+	// VERSION = "0.0.1"
+
+	// GITCommit overwritten automatically by the build
+	GITCOMMIT = "HEAD"
+
+	// Built time overwritten automatically by the build
+	BUILDTIME = "NOW"
+
+	// Built hostname overwritten automatically by build
+	HOSTNAME = "LOCALHOST"
+)

main.go

@@ -45,6 +45,8 @@ func main() {
 		os.Exit(2)
 	}
 
+	log.Print("hdfs-mount: current head GITCommit: ", GITCOMMIT, ", Built time: ", BUILDTIME, ", Built by:", HOSTNAME)
+
 	allowedPrefixes := strings.Split(*allowedPrefixesString, ",")
 
 	retryPolicy.MaxAttempts += 1 // converting # of retry attempts to total # of attempts