readme: update with example of logging to file

README.md

@@ -87,7 +87,8 @@ func init() {
   // Log as JSON instead of the default ASCII formatter.
   log.SetFormatter(&log.JSONFormatter{})
 
-  // Output to stdout instead of the default stderr, could also be a file.
+  // Output to stdout instead of the default stderr
+  // Can be any io.Writer, see below for File example
   log.SetOutput(os.Stdout)
 
   // Only log the warning severity or above.
@@ -138,7 +139,15 @@ var log = logrus.New()
 func main() {
   // The API for setting attributes is a little different than the package level
   // exported logger. See Godoc.
-  log.Out = os.Stderr
+  log.Out = os.Stdout
+
+  // You could set this to any `io.Writer` such as a file
+  // file, err := os.OpenFile("logrus.log", os.O_CREATE|os.O_WRONLY, 0666)
+  // if err == nil {
+  //  log.Out = file
+  // } else {
+  //  log.Info("Failed to log to file, using default stderr")
+  // }
 
   log.WithFields(logrus.Fields{
     "animal": "walrus",

examples/basic/basic.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"github.com/Sirupsen/logrus"
-	"os"
+	// "os"
 )
 
 var log = logrus.New()
@@ -10,6 +10,14 @@ var log = logrus.New()
 func init() {
 	log.Formatter = new(logrus.JSONFormatter)
 	log.Formatter = new(logrus.TextFormatter) // default
+
+	// file, err := os.OpenFile("logrus.log", os.O_CREATE|os.O_WRONLY, 0666)
+	// if err == nil {
+	// 	log.Out = file
+	// } else {
+	// 	log.Info("Failed to log to file, using default stderr")
+	// }
+
 	log.Level = logrus.DebugLevel
 }
 

terminal_solaris.go

@@ -13,7 +13,7 @@ func IsTerminal(f io.Writer) bool {
 	var termios Termios
 	switch v := f.(type) {
 	case *os.File:
-		_, err := unix.IoctlGetTermios(int(f.Fd()), unix.TCGETA)
+		_, err := unix.IoctlGetTermios(int(v.Fd()), unix.TCGETA)
 		return err == nil
 	default:
 		return false