自动化建立、分割、格式化、挂载虚拟映像档

SD_IMAGE=sdcard.img
SD_IMAGE_SIZE=1G
SD_IMAGE1=sdcard.img1
SD_IMAGE2=sdcard.img2

PART1_SIZE=100M

PART1_OFFSET=1
PART1_SECTORS=1
PART1_BLOCKS=1

PART2_OFFSET=1
PART2_SECTORS=1
PART2_BLOCKS=1

LOOP0=/dev/loop0
LOOP1=/dev/loop1
LOOP2=/dev/loop2

MOUNT_DIR1=/mnt/sdcard1
MOUNT_DIR2=/mnt/sdcard2

echo "建立挂载资料夹"
mkdir $MOUNT_DIR1 2>/dev/null
mkdir $MOUNT_DIR2 2>/dev/null
sleep 1
echo "建立完成，开始解除挂载资料夹 $MOUNT_DIR1 $MOUNT_DIR2"
umount $MOUNT_DIR1 2>/dev/null
umount $MOUNT_DIR2 2>/dev/null
sleep 1

echo "清除连接装置 $LOOP2"
losetup -d $LOOP2 2>/dev/null
echo "清除连接装置 $LOOP1"
losetup -d $LOOP1 2>/dev/null
echo "清除连接装置 $LOOP0"
losetup -d $LOOP0 2>/dev/null
sleep 1

echo "建立虚拟 SD 卡 $SD_IMAGE 中"
dd if=/dev/zero of=$SD_IMAGE bs=$SD_IMAGE_SIZE count=1 2>/dev/null
echo "建立完成"
sleep 1

echo "开始执行虚拟映像 $SD_IMAGE 的分割 (PART1: 建立脚本)..."
cat > /tmp/fdisk.cmd << EOF
n
p
1

+$PART1_SIZE
t
b
n
p
2


w
EOF
echo "脚本建立完成"
sleep 1
echo "开始执行虚拟映像 $SD_IMAGE 的分割 (PART2: 执行脚本)..."
fdisk $SD_IMAGE < /tmp/fdisk.cmd >/dev/null
echo "分割完成"
sleep 1
echo "开始计算分割所需容量..."
PART1_OFFSET=`fdisk -lu $SD_IMAGE | grep $SD_IMAGE1 | tr -s ' ' | cut -d\  -f 2`
PART1_SECTORS=`fdisk -lu $SD_IMAGE | grep $SD_IMAGE1 | tr -s ' ' | cut -d\  -f 4`
PART1_BLOCKS=`expr $PART1_SECTORS / 2`

PART2_OFFSET=`fdisk -lu $SD_IMAGE | grep $SD_IMAGE2 | tr -s ' ' | cut -d\  -f 2`
PART2_SECTORS=`fdisk -lu $SD_IMAGE | grep $SD_IMAGE2 | tr -s ' ' | cut -d\  -f 4`
PART2_BLOCKS=`expr $PART2_SECTORS / 2`
echo "计算完成"
sleep 1
echo "开始将 $SD_IMAGE 连接至 $LOOP0 上"
losetup $LOOP0 $SD_IMAGE
echo "开始将 $SD_IMAGE1 连接至 $LOOP1 上"
losetup -o `expr $PART1_OFFSET \* 512` $LOOP1 $LOOP0
echo "开始将 $SD_IMAGE2 连接至 $LOOP2 上"
losetup -o `expr $PART2_OFFSET \* 512` $LOOP2 $LOOP0
# echo PART1_OFFSET=$PART1_OFFSET, PART1_BLOCKS=$PART1_BLOCKS
# echo PART2_OFFSET=$PART2_OFFSET, PART2_BLOCKS=$PART2_BLOCKS
sleep 1
echo "装置连接完成，执行格式化..."
apt-get install dosfstools -y >/dev/null
mkdosfs -s 2 $LOOP1 $PART1_BLOCKS 2>/dev/null
mkfs.ext4 $LOOP2 >/dev/null
sleep 1
echo "格式化完成，执行挂载..."
mount $LOOP1 $MOUNT_DIR1
mount $LOOP2 $MOUNT_DIR2
echo "挂载完成。"
echo ""