loop: add the commit_hash to GetInfoResponse, change version semantics

With this commit we extend GetinfoResponse with the strict commit hash
(which also includes whether the build tree was clean or dirty).

cmd/loop/main.go

@@ -162,7 +162,7 @@ func fatal(err error) {
 func main() {
 	app := cli.NewApp()
 
-	app.Version = loop.Version()
+	app.Version = loop.RichVersion()
 	app.Name = "loop"
 	app.Usage = "control plane for your loopd"
 	app.Flags = []cli.Flag{

loopd/run.go

@@ -176,7 +176,7 @@ func Run(rpcCfg RPCConfig) error {
 	appName := filepath.Base(os.Args[0])
 	appName = strings.TrimSuffix(appName, filepath.Ext(appName))
 	if config.ShowVersion {
-		fmt.Println(appName, "version", loop.Version())
+		fmt.Println(appName, "version", loop.RichVersion())
 		os.Exit(0)
 	}
 
@@ -222,7 +222,7 @@ func Run(rpcCfg RPCConfig) error {
 	}
 
 	// Print the version before executing either primary directive.
-	infof("Version: %v", loop.Version())
+	infof("Version: %v", loop.RichVersion())
 
 	lisCfg := NewListenerConfig(&config, rpcCfg)
 

loopd/swapclient_server.go

@@ -1210,6 +1210,7 @@ func (s *swapClientServer) GetInfo(ctx context.Context,
 
 	return &looprpc.GetInfoResponse{
 		Version:      loop.Version(),
+		CommitHash:   loop.CommitHash(),
 		Network:      s.config.Network,
 		RpcListen:    s.config.RPCListen,
 		RestListen:   s.config.RESTListen,

looprpc/client.proto

@@ -1045,6 +1045,11 @@ message GetInfoResponse {
     Statistics about loop ins.
      */
     LoopStats loop_in_stats = 8;
+
+    /*
+    The git commit hash of the loopd binary.
+     */
+    string commit_hash = 9;
 }
 
 message GetLiquidityParamsRequest {

looprpc/client.swagger.json

@@ -967,6 +967,10 @@
         "loop_in_stats": {
           "$ref": "#/definitions/looprpcLoopStats",
           "description": "Statistics about loop ins."
+        },
+        "commit_hash": {
+          "type": "string",
+          "description": "The git commit hash of the loopd binary."
         }
       }
     },

version.go

@@ -45,13 +45,25 @@ const (
 var AgentName = defaultAgentName
 
 // Version returns the application version as a properly formed string per the
-// semantic versioning 2.0.0 spec (http://semver.org/) and the commit it was
-// built on.
+// semantic versioning 2.0.0 spec (http://semver.org/).
 func Version() string {
+	// Append commit hash of current build to version.
+	return semanticVersion()
+}
+
+// RichVersion returns the application version as a properly formed string
+// per the semantic versioning 2.0.0 spec (http://semver.org/) and the commit
+// it was built on.
+func RichVersion() string {
 	// Append commit hash of current build to version.
 	return fmt.Sprintf("%s commit=%s", semanticVersion(), Commit)
 }
 
+// CommitHash returns the commit hash of the current build.
+func CommitHash() string {
+	return Commit
+}
+
 // UserAgent returns the full user agent string that identifies the software
 // that is submitting swaps to the loop server.
 func UserAgent(initiator string) string {