new code booting from local disk

before this fix, the FAI ISO could only boot from the first or second disk

conf/grub.cfg

@@ -7,6 +7,7 @@ insmod part_msdos
 insmod part_gpt
 insmod all_video
 insmod gfxterm
+insmod regexp
 
 set gfxmode=auto
 set color_normal=white/black
@@ -44,27 +45,44 @@ menuentry "Client standalone installation - select installation type from menu "
 }
 
 menuentry "Boot OS from first partition on first disk" {
-   if [ "$grub_platform" = "efi" ]; then
-      if [ -f (hd0,gpt1)/efi/debian/grub.cfg ]; then
-           configfile (hd0,gpt1)/efi/debian/grub.cfg
-      elif [ -f (hd1,gpt1)/efi/debian/grub.cfg ]; then
-           configfile (hd1,gpt1)/efi/debian/grub.cfg
-      elif [ -f (hd0,gpt2)/boot/grub/grub.cfg ]; then
-           configfile (hd0,gpt2)/boot/grub/grub.cfg
-      elif [ -f (hd1,gpt2)/boot/grub/grub.cfg ]; then
-           configfile (hd1,gpt2)/boot/grub/grub.cfg
-      else
-	   echo "cannot find grub.cfg"
-	   sleep 7
+
+if [ "$grub_platform" = "efi" ]; then
+
+  for d in (hd*); do
+    for cfg in efi/debian/grub.cfg boot/grub/grub.cfg ; do
+      if [ -e "$d/$cfg" ]; then
+         found=true
+         echo "FOUND $d/$cfg"
+         sleep 1
+         configfile "$d/$cfg"
       fi
-   # legacy BIOS booting
-   elif [ -d (cd) ]; then
-       set root=(hd0)
-       chainloader +1
-   else
-       set root=(hd1)
-       chainloader +1
-   fi
+    done
+  done
+
+  if [ "$found" != true ]; then
+    echo "Cannot find grub.cfg"
+    sleep 7
+  fi
+
+else
+
+  # legacy BIOS booting
+  # detect which disk has a DOS partitions, and boot the MBR via chainloader
+  found=false
+  for d in (hd*,msdos*); do
+    if [ "$found" = "false" ]; then
+      regexp -s device '^\((.+),' $d
+      if [ "$device" != "" ]; then
+        found=true
+        set root=($device)
+        chainloader +1
+      fi
+    fi
+  done
+  echo "Booting from $device"
+  sleep 1
+
+fi
 }
 
 menuentry "Rescue system, no installation" {