Set success=1 for the recovery kernel

mod_image_for_recovery.sh

 #!/bin/bash
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This script modifies a base image to act as a recovery installer.
 # If no kernel image is supplied, it will build a devkeys signed recovery
 # kernel.  Alternatively, a signed recovery kernel can be used to
 # create a Chromium OS recovery image.
@@ skipping 266 matching lines @@
        seek=$kern_b_offset \
        conv=notrunc
   fi
 
   # Install the recovery kernel as primary.
   dd if="$RECOVERY_KERNEL_IMAGE" of="$RECOVERY_IMAGE" bs=512 \
      seek=$kern_a_offset \
      count=$kern_a_size \
      conv=notrunc
 
+  # Set the 'Success' flag to 1 (to prevent the firmware from updating
+  # the 'Tries' flag).
+  sudo $GPT add -i 2 -S 1 "$RECOVERY_IMAGE"
+
   # Repeat for the legacy bioses.
   # Replace vmlinuz.A with the recovery version
   local sysroot="${FLAGS_build_root}/${FLAGS_board}"
   local vmlinuz="$sysroot/boot/vmlinuz"
   local esp_offset=$(partoffset "$RECOVERY_IMAGE" 12)
   local esp_mnt=$(mktemp -d)
   set +e
   local failed=0
   sudo mount -o loop,offset=$((esp_offset * 512)) "$RECOVERY_IMAGE" "$esp_mnt"
   sudo cp "$vmlinuz" "$esp_mnt/syslinux/vmlinuz.A" || failed=1
@@ skipping 114 matching lines @@
 
 trap cleanup EXIT
 
 maybe_resize_stateful  # Also copies the image if needed.
 
 install_recovery_kernel
 
 echo "Recovery image created at $RECOVERY_IMAGE"
 print_time_elapsed
 trap - EXIT