#!/sbin/sh

# Usage instructions
if [ $# -gt 0 ]; then
	if [ $1 == "--help" ]; then
		echo "Usage: 'onandroid desired_backup_name'"
		echo "Note: A default backup name consisting of the current date and time is used if no backup name is provided."
		exit 0
	fi
fi

echo "##########################################"
echo "Online Nandroid Backup v1.1"
echo "* A tool to perform a nandroid backup"
echo "    without booting into recovery. It can"
echo "    be run via adb shell or terminal"
echo "    emulator in Android, thus allowing"
echo "    you to do a live nandroid backup"
echo "    within Android."
echo "* This tool backups /system , /data , "
echo "    /cache & .android_secure partitions."
echo "* It is fully compatible with nandroid."
echo "* Pass an argument to customize"
echo "    backup name."
echo "* Created by Ameer Dawood"
echo "##########################################"
echo ""

# Start timer
start_time=`date +%s`

# Define constants
def_name=`date -u +%Y-%m-%d.%H.%M.%S`
path="/sdcard/clockworkmod/backup"

# Check for required tools
echo "`date +%T` Checking for required tools..."
mkyaffs2image=`which mkyaffs2image`
if [ "$mkyaffs2image" == "" ]; then
	echo "`date +%T` Error: mkyaffs2image not found in path."
	exit 1
fi
md5sum=`which md5sum`
if [ "$md5sum" == "" ]; then
	echo "`date +%T` Error: md5sum not found in path."
	exit 1
fi
tar==`which tar`
if [ "$tar" == "" ]; then
	echo "`date +%T` Error: tar not found in path."
	exit 1
fi
sleep 1
echo "`date +%T` All required tools available."

# Disk space check (in MB)
safety=4
echo "`date +%T` Checking disk space..."
entry=`df -m /system | tail -1`
u_system=`echo $entry | cut -d' ' -f3 | cut -d'%' -f1`
entry=`df -m /data | tail -1`
u_data=`echo $entry | cut -d' ' -f3 | cut -d'%' -f1`
entry=`df -m /cache | tail -1`
u_cache=`echo $entry | cut -d' ' -f3 | cut -d'%' -f1`
entry=`df -ma /sdcard/.android_secure | tail -1`
u_as=`echo $entry | cut -d' ' -f3 | cut -d'%' -f1`
req_space=`expr $u_system + $u_data + $u_cache + $u_as + $safety`
entry=`df -m /mnt/sdcard | tail -1`
freespace=`echo $entry | cut -d' ' -f3 | cut -d'%' -f1`
echo "`date +%T` SD Card Free Space: $freespace MB"
echo "`date +%T` Required Space: $req_space MB"
if [ $freespace -lt $req_space ]; then
	echo "`date +%T` Not enough disk space! Exiting!"
	exit 1
else
	echo "`date +%T` Necessary disk space available! Continuing..."
fi

# Change to backup directory
cd $path

# Deny file names with spaces
if [ $# -gt 1 ]; then
	echo "`date +%T` Filenames with spaces are not allowed!"
	name=$def_name
else
	name="$1"
fi

# Grab backup name, if provided, or generate name with current date & time
if [ $# == 0 ]; then
	name=$def_name
else
	name="$1"
fi

# Create directory for backup
echo "`date +%T` Creating backup directory..."
if [ ! -d $name ]; then 
	mkdir -p $name
	if [ ! -d $name ]; then 
		echo "`date +%T` Error: Cannot create $name"
		exit 1
	fi
else
	touch $name/.nandroidwritable
	if [ ! -e $name/.nandroidwritable ]; then
		echo "`date +%T` Error: Cannot write to $name"
		exit 1
	fi
	rm $name/.nandroidwritable
fi
echo "`date +%T` Backing up to $path/$name"
echo "`date +%T` Opening backup directory..."
cd $name

# Backup system
echo -e "`date +%T` Backing up /system...\c"
mkyaffs2image /system system.yaffs2.img &
while [ `pidof mkyaffs2image` ]; do
	echo -n "."
	sleep 2
done
echo ""

# Backup data
echo -e "`date +%T` Backing up /data...\c"
mkyaffs2image /data data.yaffs2.img &
while [ `pidof mkyaffs2image` ]; do
	echo -n "."
	sleep 2
done
echo ""

# Backup cache
echo -e "`date +%T` Backing up /cache...\c"
mkyaffs2image /cache cache.yaffs2.img &
while [ `pidof mkyaffs2image` ]; do
	echo -n "."
	sleep 2
done
echo ""

# Backup .android_secure
echo -e "`date +%T` Backing up .android_secure...\c"
cd /sdcard
tar -cf $path/$name/.android_secure.vfat.tar .android_secure &
while [ `pidof tar` ]; do
	echo -n "."
	sleep 2
done
echo ""
cd $path/$name

# Generate md5
echo -e "`date +%T` Generating md5sum...\c"
md5sum .android_secure.vfat.tar * > nandroid.md5 &
while [ `pidof md5sum` ]; do
	echo -n "."
	sleep 2
done
echo ""

# End timer
end_time=`date +%s`
elapsed=`expr $end_time - $start_time`

# Announce
echo "`date +%T` Online Nandroid Backup Completed in $elapsed seconds!"