store and report git info

cmd/hw/main.go

@@ -27,6 +27,7 @@ func main() {
 		r := hw.V{
 			Hostname: hn,
 			V:        hw.Version,
+			G:        hw.Git,
 		}
 		if err := json.NewEncoder(w).Encode(r); err != nil {
 			log.Printf("json: %+v", err)

cmd/hwc/main.go

@@ -20,6 +20,7 @@ var success *prometheus.CounterVec
 type state struct {
 	Hostname string `json:"hostname"`
 	V        string `json:"version"`
+	G        string `json:"git"`
 
 	sync.RWMutex
 	Counts map[string]int `json:"counts"`
@@ -84,6 +85,7 @@ func main() {
 	fetcher := state{
 		Hostname: hn,
 		V:        hw.Version,
+		G:        hw.Git,
 		Counts:   map[string]int{},
 	}
 	go fetcher.update(target)

hw.go

@@ -3,6 +3,7 @@ package hw
 import "net/http"
 
 var Version = "unset"
+var Git = "unset"
 
 // OK simply return 200
 func OK(w http.ResponseWriter, req *http.Request) {}
@@ -11,4 +12,5 @@ func OK(w http.ResponseWriter, req *http.Request) {}
 type V struct {
 	Hostname string `json:"hostname"`
 	V        string `json:"version"`
+	G        string `json:"git"`
 }