USB_pendrive_sync

#!/bin/bash
# Script responsible for making essential backups onto USB thumb drive
# when mounted. Will be executed by udev .rules file.
#
# [ USB drive info:     sudo udevadm info -a -p $(sudo udevadm info -q path -n /dev/sdb) ]
########################################################################
mnt="/media/USB_mountpoint"       # Mountpoint of USB drive
src="$HOME/Documents"   # Dir containing files to be backed up
dest="$mnt/.backups"    # Backup destination on the USB drive

rules_file="$dest/.rsync_USB_pendrive.dat" # Rsync --include-from rulefile
########################################################################
sleep 5
zero=${0##*/}   # (same as running `basename $0`)
lockdir="/tmp/$zero.lock" # If existing, other instances won't get started
export DISPLAY=:0.0
count=0

# Start the script only if it's the only instance running:
if ! mkdir "$lockdir"; then
    notify-send -t 3000 -i gtk-dialog-info \
    "more than 1 instance running, skipping this one"
    clear
    echo "Error: another instance of this script is running. If you're not aware of any"
    echo "       other processes, run 'killall $zero'"; exit 0
else
    trap 'rm -rf "$lockdir"' EXIT # remove lockdir on exit
fi

# Check whether required programs are installed:
for i in notify-send rsync; do
    if ! command -v $i >/dev/null; then
        printf "ERROR\n$i does not appear to be installed on your system. Abort.\n" >&2
        notify-send -t 0 -i gtk-dialog-error \
        "ERROR from $zero script: $i does not appear to be installed on your system. Abort."; exit 1
    fi
done

# Wait for some time until drive gets mounted:
until [ -w $mnt ]; do
    if [[ "$count" -ge "5" ]]; then
        notify-send -t 0 -i gtk-dialog-error "Error from $zero:" \
        "TOSHIBA USB script was started, but mountpoint at $mnt was not found!"
        echo -e "Error from $zero:\nTOSHIBA USB script was started, but"
        echo "mountpoint at $mnt wasn't found. Abort."; exit 1
    fi
    sleep 3
    let count=$count+1
done

# Display warning message if rsync rules file is not found:
if [ ! -f $rules_file ]; then
    echo "Error: rsync rules file ($rules_file) not found!"
    notify-send -t 0 -i gtk-dialog-error "Error from $zero:" \
    "rsync rules file ($rules_file) not found. Abort."; exit 1
fi

# Give feedback...:
notify-send -t 5000 -i gtk-dialog-info "Backing up $src to $dest..."

# First make backups of small text files (extensions included in $rules_file):
rsync -ravh --delete --delete-before --max-size=50K \
--include-from="$rules_file" --exclude="*.*" $src $dest
syncstat1=$?
# Now sync .odt, .doc*, .ods and .xls (up to 20megs this time):
rsync -ravh --delete --delete-before --max-size=20M --include=*/ --include=*.odt \
--include=*.doc* --include=*.ods --include=*.xls --exclude="*" $src $dest
syncstat2=$?
# ...and finally back up KeePass password containers:
rsync -ravh --include=*/ --include=*.kdbx --exclude="*" $src $dest
syncstat3=$?

# Check whether any of the syncs finished with an error:
count=1
for i in $syncstat1 $syncstat2 $syncstat3; do
    if [[ "$i" != "0" ]]; then
        notify-send -t 5000 -i gtk-dialog-error "FYI: rsync error '$i' from $zero" \
        "(error came from $count. sync command)"
        error_tag="True"
    fi
    let count=$count+1
done
# Final feedback:
if [[ "$error_tag" == "True" ]]; then
    notify-send -t 0 -i gtk-dialog-error "Backup to $dest completed with" \
    "rsync error(s)"; exit 1
else
    notify-send -t 5000 -i gtk-dialog-info "Backup to $dest completed successfully!"; exit 0
fi