#!/bin/bash

# 参考文章：

#   . Shell特殊变量：Shell $, $#, $*, $@, $?, $$和命令行参数

#       http://c.biancheng.net/cpp/view/2739.html

# <CMD state="Updater" type="push" body="send" file="mksdcard-android.sh.tar">Sending partition shell</CMD>

# <CMD state="Updater" type="push" body="$ tar xf $FILE "> Partitioning...</CMD>

# <CMD state="Updater" type="push" body="$ sh mksdcard-android.sh /dev/mmcblk0"> Partitioning...</CMD>

# <CMD state="Updater" type="push" body="$ ls -l /dev/mmc* ">Formatting sd partition</CMD>

# partition size in MB

BOOTLOAD_RESERVE=          # bootload  8MB

BOOT_ROM_SIZE=             # 启动rom   8MB

SYSTEM_ROM_SIZE=         # 系统rom   512MB

CACHE_SIZE=              # 缓存      512MB

RECOVERY_ROM_SIZE=         # 恢复rom   8MB

VENDER_SIZE=               # 供货商    8MB

MISC_SIZE=                 # 杂项      8MB

help() {

# basename String [ Suffix ]

# basename 命令读取 String 参数，删除以 /(斜杠) 结尾的前缀以及任何指定的 Suffix 参数，

# 并将剩余的基本文件名称写至标准输出。

bn=`basename $`

cat << EOF

usage $bn <option> device_node

options:

  -h                displays this help message

  -s                only get partition size

  -np                 not partition.

  -f                 flash android image.

EOF

}

# check the if root?

# 检查当前是否拥有root权限

userid=`id -u`

if [ $userid -ne "" ]; then

    echo "you're not root?"

    exit

fi

# parse command line

# 解析命令行参数

moreoptions=

node="na"

cal_only=

flash_images=

not_partition=

not_format_fs=

# $#: 传递给脚本或函数的参数个数。

#

# $ sh mksdcard-android.sh /dev/mmcblk0

# $: /dev/mmcblk0

#

# moreoptions:

# node: /dev/mmcblk0

while [ "$moreoptions" =  -a $# -gt  ]; do

    case $ in

        -h) help; exit ;;

        -s) cal_only= ;;

        -f) flash_images= ;;

        -np) not_partition= ;;

        -nf) not_format_fs= ;;

        *)  moreoptions=; node=$ ;;

    esac

    [ "$moreoptions" =  ] && [ $# -gt  ] && help && exit

    [ "$moreoptions" =  ] && shift

done

# 如果node设备节点不存在，那么就退出程序

if [ ! -e ${node} ]; then

    help

    exit

fi

# call sfdisk to create partition table

# 调用sfdisk来创建分区表

# get total card size

# extend_size 增加了这个分量，同时data_size减小了这个分量，所以磁盘总量不变

seprate=

# -s [or --show-size]: 显示一个分区的大小，单位是KB。

total_size=`sfdisk -s ${node}`

total_size=`expr ${total_size} / `      # 重新计算，将单位换算成MB

boot_rom_sizeb=`expr ${BOOT_ROM_SIZE} + ${BOOTLOAD_RESERVE}`

extend_size=`expr ${SYSTEM_ROM_SIZE} + ${CACHE_SIZE} + ${VENDER_SIZE} + ${MISC_SIZE} + ${seprate}`

data_size=`expr ${total_size} - ${boot_rom_sizeb} - ${RECOVERY_ROM_SIZE} - ${extend_size} + ${seprate}`

# create partitions

if [ "${cal_only}" -eq "" ]; then

cat << EOF

BOOT   : ${boot_rom_sizeb}MB

RECOVERY: ${RECOVERY_ROM_SIZE}MB

SYSTEM : ${SYSTEM_ROM_SIZE}MB

CACHE  : ${CACHE_SIZE}MB

DATA   : ${data_size}MB

MISC   : ${MISC_SIZE}MB

EOF

exit

fi

# destroy the partition table

# 删除以前的分区表，从这里可以看出，分区表的大小貌似是1024字节

dd if=/dev/zero of=${node} bs= count=

sfdisk --force -uM ${node} << EOF

,${boot_rom_sizeb},

,${RECOVERY_ROM_SIZE},

,${extend_size},

,${data_size},

,${SYSTEM_ROM_SIZE},

,${CACHE_SIZE},

,${VENDER_SIZE},

,${MISC_SIZE},

EOF

# adjust the partition reserve for bootloader.

# if you don't put the uboot on same device, you can remove the BOOTLOADER_ERSERVE

# to have 8M space.

# the minimal sylinder for some card is 4M, maybe some was 8M

# just 8M for some big eMMC 's sylinder

# -N# : 只改变分区的编号 #

sfdisk --force -uM ${node} -N1 << EOF

${BOOTLOAD_RESERVE},${BOOT_ROM_SIZE},

EOF

# For MFGTool Notes:

# MFGTool use mksdcard-android.tar store this script

# if you want change it.

# do following:

#   tar xf mksdcard-android.sh.tar

#   vi mksdcard-android.sh

#   [ edit want you want to change ]

#   rm mksdcard-android.sh.tar; tar cf mksdcard-android.sh.tar mksdcard-android.sh