Added support for XP

cmd/helper.go

@@ -7,7 +7,7 @@ import (
 	"os/exec"
 )
 
-func makeLink(oldPath, newPath string) error {
-	cmd := exec.Command("ln", "-s", oldPath, newPath)
+func makeLink(srcPath, destPath string) error {
+	cmd := exec.Command("ln", "-s", srcPath, destPath)
 	return cmd.Run()
 }

cmd/helper_windows.go

@@ -1,20 +1,31 @@
 package cmd
 
 import (
+	"os"
 	"os/exec"
 	"syscall"
+
+	"github.com/Unknwon/com"
 )
 
-func makeLink(oldPath, newPath string) error {
+func init() {
+}
+
+func makeLink(srcPath, destPath string) error {
 	// Check if Windows version is XP.
+	if getWindowsVersion() >= 6 {
+		cmd := exec.Command("cmd", "/c", "mklink", "/j", destPath, srcPath)
+		return cmd.Run()
+	}
 
-	cmd := exec.Command("cmd", "/c", "mklink", "/j", newPath, oldPath)
-	return cmd.Run()
+	// XP.
+	os.RemoveAll(destPath)
+	return com.CopyDir(srcPath, destPath)
 }
 
 func getWindowsVersion() int {
 	dll := syscall.MustLoadDLL("kernel32.dll")
 	p := dll.MustFindProc("GetVersion")
 	v, _, _ := p.Call()
-	return v
+	return int(byte(v))
 }