modify grub-configmake and add a lot of option

grub-configmake/payload/usr/bin/grub-configmake

@@ -16,8 +16,11 @@ echo
 echo
 echo
 echo
-read -p "What drive do you want to set root to? (Only <number> otherwise it won't work.)" root
+read -p "What is the install root you are using?" install_root
-cat > /boot/grub/grub.cfg << "EOF"
+mkdir -p ${install_root}/boot/grub
+read -p "What drive do you want to set root to? (Only <number> otherwise it won't work.)" grub_root
+read -p "Init binary (full path only)" init_path
+cat > ${install_root}/boot/grub/grub.cfg << "EOF"
 set default=0
 set timeout=5
 
@@ -25,7 +28,7 @@ insmod ext2
 set root=(hd0,${root})
 
 menuentry "Alnux+Busybox/Linux" {
-        linux   /boot/bzImage root=/dev/sda${root} rw
+        linux   /boot/bzImage root=/dev/sda${grub_root} rw init=${init path} rw
 }
 EOF
 echo