RootFS size customization params added

src/scripts/build_gpt.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.
 #
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
 . "$(dirname "$0")/common.sh"
 
 # Load functions and constants for chromeos-install
 . "$(dirname "$0")/chromeos-common.sh"
 
 # Script must be run inside the chroot.
 restart_in_chroot_if_needed $*
 
 get_default_board
 
 # Flags.
 DEFINE_string arch "" \
   "The target architecture (\"arm\" or \"x86\")."
 DEFINE_string board "$DEFAULT_BOARD" \
   "The board to build an image for."
 DEFINE_string arm_extra_bootargs "" \
   "Additional command line options to pass to the ARM kernel."
 DEFINE_boolean recovery $FLAGS_FALSE \
   "Build GPT for a recovery image. Default: False."
+DEFINE_integer rootfs_partition_size 1024 \
+  "rootfs parition size in MBs."
 
 # Usage.
 FLAGS_HELP=$(cat <<EOF
 
 Usage: $(basename $0) [flags] IMAGEDIR OUTDEV
 
 This takes the image components in IMAGEDIR and creates a bootable,
 GPT-formatted image in OUTDEV. OUTDEV can be a file or block device.
 
 EOF
@@ skipping 70 matching lines @@
 # systems will use a U-Boot script temporarily, but it goes in the same place.
 if [[ "$ARCH" = "arm" ]]; then
   PMBRCODE=/dev/zero
 else
   PMBRCODE=$(readlink -f /usr/share/syslinux/gptmbr.bin)
 fi
 
 # Create the GPT. This has the side-effect of setting some global vars
 # describing the partition table entries (see the comments in the source).
 install_gpt $OUTDEV $ROOTFS_IMG $KERNEL_IMG $STATEFUL_IMG $PMBRCODE $ESP_IMG \
-    false $FLAGS_recovery
+    false $FLAGS_recovery $FLAGS_rootfs_partition_size 
 
 if [[ "$ARCH" = "arm" ]]; then
   # assume /dev/mmcblk1. we could not get this from ${OUTDEV}
   DEVICE=1
   MBR_SCRIPT_UIMG=$(make_arm_mbr \
     ${START_KERN_A} \
     ${NUM_KERN_SECTORS} \
     ${DEVICE} \
     "${FLAGS_arm_extra_bootargs}")
   sudo dd bs=1 count=`stat --printf="%s" ${MBR_SCRIPT_UIMG}` \
@@ skipping 34 matching lines @@
       seek=${START_ROOTFS_B}
 fi
 
 echo "Copying EFI system partition..."
 $sudo dd if=${ESP_IMG} of=${OUTDEV} conv=notrunc bs=512 seek=${START_ESP}
 
 # Clean up temporary files.
 if [[ -n "${MBR_IMG:-}" ]]; then
   rm "${MBR_IMG}"
 fi