added trace

lib.go

@@ -8,6 +8,7 @@ import (
 	"os/exec"
 	"path/filepath"
 	"runtime"
+	"runtime/debug"
 	"strings"
 )
 
@@ -49,6 +50,7 @@ const (
 // Opts.SetupProc will customize the processes before execution - Eg.: setting out and err
 type Opts struct {
 	Debug     bool
+	Trace     bool
 	Await     bool
 	Wd        string
 	SetupProc func(cmd *exec.Cmd)
@@ -227,6 +229,11 @@ func Exec(str string, opts ...*Opts) ([]*exec.Cmd, error) {
 		}
 	}
 
+	if opt.Trace {
+		bs := debug.Stack()
+		log.Printf("Running: %s\n%s", str, string(bs))
+	}
+
 	cmdwd := opt.Wd
 
 	prepCmd := func(l Line) *exec.Cmd {