RootFS size customization params added

src/platform/installer/chromeos-common.sh

 # 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 contains common constants and functions for installer scripts. This must
 # evaluate properly for both /bin/bash and /bin/sh, since it's used both to
 # create the initial image at compile time and to install or upgrade a running
 # image.
 
 # Here are the GUIDs we'll be using to identify various partitions. NOTE: The
@@ skipping 113 matching lines @@
 #   START_STATEFUL
 install_gpt() {
   local outdev=$1
   local rootfs_img=$2
   local kernel_img=$3
   local stateful_img=$4
   local pmbrcode=$5
   local esp_img=$6
   local force_full="${7:-}"
   local recovery="${8:-}"
+  local rootfs_size="${9:-1024}"   # 1G
 
   # The gpt tool requires a fixed-size target to work on, so we may have to
   # create a file of the appropriate size. Let's figure out what that size is
   # now. The full partition layout will look something like this (indented
   # lines indicate reserved regions that do not have any useful content at the
   # moment).
   #
   #   PMBR (512 bytes)
   #   Primary GPT Header (512 bytes)
   #   Primary GPT Table (16K)
@@ skipping 19 matching lines @@
   # an existing partition, 2) we want to be able to add new partitions later
   # without breaking current scripts, and 3) we may someday need to increase
   # the size of the rootfs during an upgrade, which means shrinking the size of
   # the stateful partition on a live system.
   #
   # The EFI GPT spec requires that all valid partitions be at least one sector
   # in size, and non-overlapping.
 
   # Here are the size limits that we're currently requiring
   local max_kern_sectors=32768        # 16M
-  local max_rootfs_sectors=2097152    # 1G
+  local max_rootfs_sectors=$((${rootfs_size} * 2 * 1024))  # 1G by default
   local max_oem_sectors=32768         # 16M
   local max_reserved_sectors=131072   # 64M
   local max_esp_sectors=32768         # 16M
   local min_stateful_sectors=262144   # 128M, expands to fill available space
 
   local num_pmbr_sectors=1
   local num_gpt_hdr_sectors=1
   local num_gpt_table_sectors=32      # 16K
   local num_footer_sectors=$(($num_gpt_hdr_sectors + $num_gpt_table_sectors))
   local num_header_sectors=$(($num_pmbr_sectors + $num_footer_sectors))
@@ skipping 342 matching lines @@
   local dev_path=/sys/block/${1}/device
   while [ -d "${dev_path}" -a "${dev_path}" != "/sys" ]; do
     if [ -f "${dev_path}/${2}" ]; then
       cat "${dev_path}/${2}"
       return
     fi
     dev_path=$(readlink -f ${dev_path}/..)
   done
   echo '[Unknown]'
 }