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#/bin/sh

##########################################################################

# script: backup.sh

# Author: Shi WJ

# Date: 2008.12.

# Purpose: Backup disk to an compressed image file.

##########################################################################

SOURCE_DISK=sda

TARGET_DIR=/media/sdb1/S10-2/`date +"%Y_%m%d"`

# Note: you need to make sure that the source disk is correct, and the

# target directory is changed to correctly reflect your system.

if [ $# -gt 1 ]

then

echo "Usage:"

echo " backup.sh [noClean]"

echo " Without [noClean], cleaning is automatic."

exit -1

fi

CLEAN=Y

if [ $# -eq 1 ]

then

if [ $1 != "noClean" ]

then

echo "Usage:"

echo " backup.sh [noClean]"

echo " Without [noClean], cleaning is automatic."

exit -1

fi

CLEAN=N

echo `date +"%Y/%m/%d %H:%M:%S"` " Starting Disk backup in 'noCleaning' Mode."

else

echo `date +"%Y/%m/%d %H:%M:%S"` " Starting Disk backup in 'Cleaning' Mode."

echo " FYI, './backup.sh noClean' could be used for Non-cleaning mode backup."

fi

echo `date +"%Y/%m/%d %H:%M:%S"` " Source Disk to be backed up: $SOURCE_DISK"

echo `date +"%Y/%m/%d %H:%M:%S"` " The backup image will be located in: $TARGET_DIR"

echo `date +"%Y/%m/%d %H:%M:%S"` " Checking the backup source directory..."

SOURCE_MOUNTED=N

for SOURCE_DIR in /media/${SOURCE_DISK}*

do

if [ -d ${SOURCE_DIR} ]

then

echo `date +"%Y/%m/%d %H:%M:%S"` " Source Mounted: ${SOURCE_DIR}"

SOURCE_MOUNTED=Y

fi

done

if [ ${SOURCE_MOUNTED} = "N" ]

then

echo `date +"%Y/%m/%d %H:%M:%S"` " No source directory is not mounted. Exiting..."

exit -1

fi

echo `date +"%Y/%m/%d %H:%M:%S"` " Checking the backup target directory..."

if [ ! -d ${TARGET_DIR} ]

then

echo `date +"%Y/%m/%d %H:%M:%S"` " Backup target directory ${TARGET_DIR} does not exist. Creating..."

mkdir ${TARGET_DIR}

if [ $? -eq 0 ]

then

echo `date +"%Y/%m/%d %H:%M:%S"` " Backup target directory ${TARGET_DIR} created."

else

echo `date +"%Y/%m/%d %H:%M:%S"` " Failed to create backup target directory ${TARGET_DIR}. Exiting..."

exit -1

fi

else

echo `date +"%Y/%m/%d %H:%M:%S"` " Backup target directory ${TARGET_DIR} exists."

fi

if [ $CLEAN = "Y" ]

then

echo `date +"%Y/%m/%d %H:%M:%S"` " Ready to clean the free space in source disk before backup."

for SOURCE_DIR in /media/${SOURCE_DISK}*

do

if [ -d ${SOURCE_DIR} ]

then

echo `date +"%Y/%m/%d %H:%M:%S"` " Cleaning unused space of ${SOURCE_DIR}..."

dd if=/dev/zero of=${SOURCE_DIR}/zerofile bs=512k

rm ${SOURCE_DIR}/zerofile

fi

done

else

echo `date +"%Y/%m/%d %H:%M:%S"` " Source disk cleaning skipped."

fi

echo `date +"%Y/%m/%d %H:%M:%S"` " Backup the entire hard disk to the image file..."

dd if=/dev/sda ibs=512k | gzip > ${TARGET_DIR}/img.gz

echo `date +"%Y/%m/%d %H:%M:%S"` " Backup complete. The image file: ${TARGET_DIR}/img.gz"

echo "gzip -dc $TARGET_DIR/img.gz | dd of=/dev/sda obs=512k &" > $TARGET_DIR/restore.sh

echo `date +"%Y/%m/%d %H:%M:%S"` " restore.sh created ${TARGET_DIR}/restore.sh"

echo "Good-bye"

exit 0