filter GOPATH from stack trace (#1755)

logger.go

@@ -17,11 +17,14 @@
 package main
 
 import (
+	"bufio"
+	"bytes"
 	"os"
 	"reflect"
 	"runtime"
 	"runtime/debug"
 	"strconv"
+	"strings"
 
 	"github.com/Sirupsen/logrus"
 	"github.com/dustin/go-humanize"
@@ -45,8 +48,8 @@ type logger struct {
 	// Add new loggers here.
 }
 
-// getSysInfo returns useful system statistics.
-func getSysInfo() map[string]string {
+// sysInfo returns useful system statistics.
+func sysInfo() map[string]string {
 	host, err := os.Hostname()
 	if err != nil {
 		host = ""
@@ -66,20 +69,36 @@ func getSysInfo() map[string]string {
 	}
 }
 
+// stackInfo returns printable stack trace.
+func stackInfo() string {
+	// Convert stack-trace bytes to io.Reader.
+	rawStack := bufio.NewReader(bytes.NewBuffer(debug.Stack()))
+	// Skip stack trace lines until our real caller.
+	for i := 0; i <= 4; i++ {
+		rawStack.ReadLine()
+	}
+
+	// Read the rest of useful stack trace.
+	stackBuf := new(bytes.Buffer)
+	stackBuf.ReadFrom(rawStack)
+
+	// Strip GOPATH of the build system and return.
+	return strings.Replace(stackBuf.String(), minioGOPATH+"/src/", "", -1)
+}
+
 // errorIf synonymous with fatalIf but doesn't exit on error != nil
 func errorIf(err error, msg string, data ...interface{}) {
 	if err == nil {
 		return
 	}
-	sysInfo := getSysInfo()
+	sysInfo := sysInfo()
 	fields := logrus.Fields{
 		"cause":   err.Error(),
 		"type":    reflect.TypeOf(err),
 		"sysInfo": sysInfo,
 	}
 	if globalTrace {
-		stack := debug.Stack()
-		fields["stack"] = string(stack)
+		fields["stack"] = "\n" + stackInfo()
 	}
 	log.WithFields(fields).Errorf(msg, data...)
 }
@@ -89,15 +108,14 @@ func fatalIf(err error, msg string, data ...interface{}) {
 	if err == nil {
 		return
 	}
-	sysInfo := getSysInfo()
+	sysInfo := sysInfo()
 	fields := logrus.Fields{
 		"cause":   err.Error(),
 		"type":    reflect.TypeOf(err),
 		"sysInfo": sysInfo,
 	}
 	if globalTrace {
-		stack := debug.Stack()
-		fields["stack"] = string(stack)
+		fields["stack"] = "\n" + stackInfo()
 	}
 	log.WithFields(fields).Fatalf(msg, data...)
 }