fix issue #521

blackarch boot failed

INSTALL/grub/grub.cfg

@@ -257,6 +257,8 @@ function distro_specify_initrd_file_phase2 {
         if [ "$grub_platform" != "pc" ]; then
             vt_add_replace_file 0 "EFI\\archiso\\archiso.img"
         fi
+    elif [ -f (loop)/blackarch/boot/x86_64/archiso.img ]; then 
+        vt_linux_specify_initrd_file /blackarch/boot/x86_64/archiso.img
     fi
 }
 
@@ -501,6 +503,10 @@ function uefi_linux_menu_func {
                 elif [ -f (loop)/boot/initramfs_x86_64.img ]; then
                     vt_add_replace_file $vtindex "boot\\initramfs_x86_64.img"
                 fi
+            elif [ -d (loop)/blackarch ]; then
+                if [ -f (loop)/blackarch/boot/x86_64/archiso.img ]; then
+                    vt_add_replace_file $vtindex "EFI\\archiso\\archiso.img"
+                fi
             elif [ -d (loop)/parabola ]; then
                 if [ -f (loop)/parabola/boot/x86_64/parabolaiso.img ]; then
                     vt_add_replace_file $vtindex "EFI\\parabolaiso\\parabolaiso.img"