#!/bin/bash

#Script to back up /home/tracey to external USB drive
#http://www.bobulous.org.uk/misc/rsync-backup.html
date=`date +%Y-%m-%d`
log_file='/home/tracey/backuplogs/usb-rsync-backup-'${date}'.txt'
backup_dir_mount='/data/LinuxBack'

echo "#####"
echo ""

# Check what OS we're on
# OS=`awk -F = '/NAME/{print $2}' /etc/os-release`
# echo "OS we're running on is $OS"
source ~/git/shell-scripts/check_os.sh

# Get the mount point by uuid
#UUID=ff0b3c83-853d-452f-abb6-48069e337446
#mount_point=`findmnt -rn -S UUID=$UUID -o TARGET`

# For dedicated Linux Backup drive

# LABEL="LinuxBackups" UUID="498d5c30-d9c2-4fcd-ba75-ca417ea5e962" TYPE="ext4" PARTUUID="f1ee7312-41a8-b044-879a-8eef185b0453"

mount_point=/data/LinuxBack

echo "Mount point is $mount_point"

# Check whether target volume is mounted, and mount it if not.
if ! mountpoint -q ${mount_point}/; then
	echo "Mounting the external USB drive."
	echo "Mountpoint is ${mount_point}"
	if ! mount ${mount_point}; then
		echo "An error code was returned by mount command!"
		exit 5
	else echo "Mounted successfully.";
	fi
else echo "${mount_point} is already mounted.";
fi
# Target volume **must** be mounted by this point. If not, die screaming.
if ! mountpoint -q ${mount_point}/; then
	echo "Mounting failed! Cannot run backup without a mounted backup volume!"
	exit 1
fi

# This only has to be done once per new ext* partition. Perms should stick after that every time its mounted
if [ -w $backup_dir_mount ]
then
     echo "User has write permission for backup directory, proceeding with rsync"
else
     echo "Changing ownership for backup directory - only has to be done once for the drive"
     sudo chown tracey.users $backup_dir_mount
fi

# Check whether target directory exists. If not need to use sudo to make it

if [ ! -d "$backup_dir_mount/tracey_home" ]; then
  echo "Creawting backup directory"
fi

echo "Preparing to rsync differences in home directory to backup USB drive."

rsync -azh --exclude '.cache' --exclude 'Videos' --exclude 'Nextcloud' --exclude 'Downloads/isos' --exclude 'VirtualBox VMs' --exclude 'Sync' --exclude '.local/share/Steam' --exclude 'Music' --exclude '.Trash-*' --exclude 'home_backup' --progress /home/tracey/ $mount_point/tracey_home --delete 2>&1 | tee $log_file

echo ""
echo "Backup Complete"
echo "Log of this backup is in $log_file"
echo "Now deleting backup logs over 7 days"
echo "####"

find /home/tracey/backuplogs -iname 'usb-rsync-backup-*' -mtime +7 -type f -delete