只能正常运行一次的shell脚本，重启也一样【求助】
本帖最后由 quanguoheme 于 2013-07-05 19:29 编辑我有一个shell脚本只能正常运行一次。第二次运行后，就不对了 。求助，脚本哪一个语句有问题。
脚本使用方法：sudo ./fsl-sdcard-partition.sh /dev/sdb
脚本是用来对sd卡进行格式化的。/dev/sdb代表我的sd卡。第一次运行可以，正常格式化，是可以实现在sd卡前面保留一个2mb作为u-boot.bin作为区域的。
脚本第二次运行，格式化不正常，不可以实现在sd卡前面保留一个2mb区域。
脚本内容：#!/bin/bash
# partition size in MB
BOOTLOAD_RESERVE=8
BOOT_ROM_SIZE=8
SYSTEM_ROM_SIZE=512
CACHE_SIZE=512
RECOVERY_ROM_SIZE=8
VENDER_SIZE=8
MISC_SIZE=8
help() {
bn=`basename $0`
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?
userid=`id -u`
if [ $userid -ne "0" ]; then
echo "you're not root?"
exit
fi
# parse command line
moreoptions=1
node="na"
cal_only=0
flash_images=0
not_partition=0
not_format_fs=0
while [ "$moreoptions" = 1 -a $# -gt 0 ]; do
case $1 in
-h) help; exit ;;
-s) cal_only=1 ;;
-f) flash_images=1 ;;
-np) not_partition=1 ;;
-nf) not_format_fs=1 ;;
*)moreoptions=0; node=$1 ;;
esac
[ "$moreoptions" = 0 ] && [ $# -gt 1 ] && help && exit
[ "$moreoptions" = 1 ] && shift
done
if [ ! -e ${node} ]; then
help
exit
fi
# call sfdisk to create partition table
# get total card size
seprate=40
total_size=`sfdisk -s ${node}`
total_size=`expr ${total_size} / 1024`
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 "1" ]; 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
function format_android
{
echo "formating android images"
mkfs.ext4 ${node}4 -Ldata
mkfs.ext4 ${node}5 -Lsystem
mkfs.ext4 ${node}6 -Lcache
mkfs.ext4 ${node}7 -Lvender
}
if [[ "${not_partition}" -eq "1" && "${flash_images}" -eq "1" ]] ; then
flash_android
exit
fi
# destroy the partition table
dd if=/dev/zero of=${node} bs=1024 count=1
sfdisk --force -uM ${node} << EOF
,${boot_rom_sizeb},83
,${RECOVERY_ROM_SIZE},83
,${extend_size},5
,${data_size},83
,${SYSTEM_ROM_SIZE},83
,${CACHE_SIZE},83
,${VENDER_SIZE},83
,${MISC_SIZE},83
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
sfdisk --force -uM ${node} -N1 << EOF
${BOOTLOAD_RESERVE},${BOOT_ROM_SIZE},83
EOF
# format the SDCARD/DATA/CACHE partition
part=""
echo ${node} | grep mmcblk > /dev/null
if [ "$?" -eq "0" ]; then
part="p"
fi
format_android
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