Added logfile support

Signed-off-by: Sebastien Douheret <sebastien.douheret@iot.bzh>

1 files changed, 19 insertions, 2 deletions

diff --git a/main.go b/main.go
index 668738c..f9b32f3 100644
--- a/main.go
+++ b/main.go
@@ -178,6 +178,12 @@ func main() {
 			Value:  defaultLogLevel,
 		},
 		cli.StringFlag{
+			Name:   "logfile",
+			Value:  "stderr",
+			Usage:  "filename where logs will be redirected (default stderr)\n\t",
+			EnvVar: "XDS_LOGFILENAME",
+		},
+		cli.StringFlag{
 			Name:   "url, u",
 			EnvVar: "XDS_AGENT_URL",
 			Value:  "localhost:8800",
@@ -206,8 +212,8 @@ func main() {
 
 	// Add --config option to all commands to support --config option either before or after command verb
 	// IOW support following both syntaxes:
-	//   xds-cli exec --config myprj.conf ...
-	//   xds-cli --config myprj.conf exec ...
+	//   xds-cli exec --config myPrj.conf ...
+	//   xds-cli --config myPrj.conf exec ...
 	for i, cmd := range app.Commands {
 		if len(cmd.Flags) > 0 {
 			app.Commands[i].Flags = append(cmd.Flags, cli.StringFlag{Hidden: true, Name: "config, c"})
@@ -277,6 +283,17 @@ func main() {
 		}
 		Log.Formatter = &logrus.TextFormatter{}
 
+		if ctx.String("logfile") != "stderr" {
+			logFile, _ := common.ResolveEnvVar(ctx.String("logfile"))
+			fdL, err := os.OpenFile(logFile, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
+			if err != nil {
+				msgErr := fmt.Sprintf("Cannot create log file %s", logFile)
+				return cli.NewExitError(msgErr, 1)
+			}
+			Log.Infof("Logging to file: %s", logFile)
+			Log.Out = fdL
+		}
+
 		Log.Infof("%s version: %s", AppName, app.Version)
 		earlyDisplay()
 		Log.Debugf("\nEnvironment: %v\n", os.Environ())