Bash script example - 使用parted可以非交互式的做磁盘分区操作

#!/bin/bash

# Startup check

case "$#" in

2)

    echo "Install package: ${1} on device: ${2}, start working..." ;;

*)

    echo "Usage: ${0} <l4t buildbrain file path> <SD card device file>"

    exit ;;

esac



function get_disk_info() {

  # look for a "given" file somewhere in the path upwards from the device

  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]'

}



# Generates a descriptive string of a removable device. Includes the

# manufacturer (if non-empty), product and a human-readable size.

function get_disk_string() {

  local disk="${1##*/}"

  local manufacturer_string=$(get_disk_info $disk manufacturer)

  local product_string=$(get_disk_info $disk product)

  local disk_size=$(sudo fdisk -l /dev/$disk 2>/dev/null | grep Disk |

                    head -n 1 | cut -d' ' -f3-4 | sed 's/,//g')

  # I've seen one case where manufacturer only contains spaces, hence the test.

  if [ -n "${manufacturer_string// }" ]; then

    echo -n "${manufacturer_string} "

  fi

  echo "${product_string}, ${disk_size}"

}



# Prompt for user confirmation. Default is no, which will gracefully terminate

# the script.

function are_you_sure() {

  local sure

  read -p "Are you sure (y/N)? " sure

  if [ "${sure}" != "y" ]; then

    echo "Ok, better safe than sorry."

    exit

  fi

}



echo "Checking l4t buildbrain package exists..."

if [ ! -f "${1}" ]; then

        echo "L4T buildbrain package: ${1} doesn't exist, quit..."

        exit

fi

echo "Checking device file exists..."

if [ ! -b "${2}" ]; then

        echo "SD card device file: ${2} doesn't exist OR is not a block device file, quit..."

        exit

fi



# Enter sudo passwd first

sudo ls /root >& /dev/null



echo -n "WARNING: This will erase all data in ${2}: "

get_disk_string ${2}

are_you_sure



# Umount any mounts of the disk

mount_list=$(mount | grep ^"${2}" | awk '{print $3}')

if [ -n "${mount_list}" ]; then

    echo "Attempting to unmount any mounts on the target device..."

    for i in ${mount_list}; do

        sudo umount "$i" >& /dev/null

    done

    sleep 3

fi



echo "Repartition ${2}..."

sudo parted -s ${2} mklabel msdos

sudo parted -s ${2} mkpart primary ext3 0 1024 >& /dev/null



echo "Formating ${2}1..."

sudo mkfs.ext3 ${2}1 >& /dev/null



echo "Start preparing the l4t disk..."

sudo rm -rf full_linux_for_tegra

pkgdir=$(dirname ${1})

cd ${pkgdir}

tar -xpf ${1}

cd full_linux_for_tegra

tar -xpf linux_for_tegra.tbz2

cd Linux_for_Tegra/rootfs/

sudo tar xpf http://www.cnblogs.com/sample_fs.tgz

sudo tar jxpf http://www.cnblogs.com/restricted_binaries.tbz2

sudo tar jxpf http://www.cnblogs.com/restricted_codecs.tbz2

sudo tar jxpf http://www.cnblogs.com/nvidia_use_only.tbz2

sudo tar zxpf http://www.cnblogs.com/tests_output.tgz

cd ../

sudo chown -R `cat rootfs/etc/passwd | grep ubuntu | cut -d : -f 3-4` rootfs/home/ubuntu/

sudo ./apply_binaries.sh



# Start writing to sd card

echo "Start writing to ${2}..."

sudo mount ${2}1 /mnt

cd rootfs

sudo tar -cpf - * | ( cd /mnt/ ; sudo tar -xpf - )

sudo umount /mnt

cd ..



echo "Done."

 

1. 使用parted这个工具可以以非交互的方式来对磁盘分区进行操作。而且parted支持GPT partition table。命令parted -s /dev/sdb mklabel msdos可以将当前的分区表全部清空，然后创建成指定的分区表格式，这个非常有用。之前网上的方法：dd if=/dev/zero of=/dev/sdb bs=512 count=1这种方式是不能支持GPT table的，普通分区表可以。