backup.sh

#!/bin/bash

## Borrowed from https://stackoverflow.com/a/28752314
##
## COMMAND USAGE: backup.sh [backup source location] [backup target device] [backup target location] [log file] [timeout]
##
## for example: backup.sh "user@serve:/path" "/media/disk2" "/media/disk2"
##

##
## VARIABLES
##

# Set remote source location
BACKUP_SOURCE="$1"

# Set target location
BACKUP_TARGET_DEV="$2"
BACKUP_TARGET="$3"

# Log file
LOG_FILE="$4"

# Timeout
TIMEOUT="${5:-6h}"

##
## SCRIPT
##

function end() {
    echo -e "###########################################################################\
#########################################################################\n\n" >> "$LOG_FILE"
    exit $1
}

# Check that the log file exists
if [ ! -e "$LOG_FILE" ]; then
        touch "$LOG_FILE"
    chown $USER "$LOG_FILE"
fi

# Check that target dir exists and is writable.
if [ ! -w  "$BACKUP_TARGET" ]; then
        echo "$(date "+%Y-%m-%d %k:%M:%S") - ERROR: Unable to write to target dir." >> "$LOG_FILE"
        echo "$(date "+%Y-%m-%d %k:%M:%S") - ERROR: Unable to sync." >> "$LOG_FILE"
    end 1
fi

# Check if the drive is mounted
if ! mountpoint "$BACKUP_TARGET_DEV"; then
        echo "$(date "+%Y-%m-%d %k:%M:%S") - WARNING: Backup device needs mounting!" >> "$LOG_FILE"

        # If not, mount the drive
        if mount "$BACKUP_TARGET_DEV" > /dev/null 2>&1 || /bin/false; then
                echo "$(date "+%Y-%m-%d %k:%M:%S") - Backup device mounted." >> "$LOG_FILE"
        else
                echo "$(date "+%Y-%m-%d %k:%M:%S") - ERROR: Unable to mount backup device." >> "$LOG_FILE"
                echo "$(date "+%Y-%m-%d %k:%M:%S") - ERROR: Unable to sync." >> "$LOG_FILE"
        end 1
        fi
fi

# Start entry in the log
echo "$(date "+%Y-%m-%d %k:%M:%S") - Sync started." >> "$LOG_FILE"

# Start sync
timeout "${TIMEOUT}" rsync --usermap=root:nicolas-delsaux --groupmap=root:nicolas-delsaux --archive --compress --progress --partial --update --human-readable "$BACKUP_SOURCE" "$BACKUP_TARGET" >> "$LOG_FILE"

# Unmount the drive so it does not accidentally get damaged or wiped
if umount "$BACKUP_TARGET_DEV" > /dev/null 2>&1 || /bin/false; then
    echo "$(date "+%Y-%m-%d %k:%M:%S") - Backup device unmounted." >> "$LOG_FILE"
else
    echo "$(date "+%Y-%m-%d %k:%M:%S") - WARNING: Backup device could not be unmounted." >> "$LOG_FILE"
fi

# Exit successfully
end 0