Added logfile support

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

diff --git a/main.go b/main.go
index 668738c..f9b32f3 100644 (file)
--- a/main.go
+++ b/main.go
@@ -177,6 +177,12 @@ func main() {
                        Usage:  "logging level (supported levels: panic, fatal, error, warn, info, debug)",
                        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",
@@ -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())