backup-configs

#!/usr/bin/env bash

#########################################################################
## Title:        backup-configs
## Description:	 Backup all custom configs to the mounted backup location
## Author:       Andrew Lamarra
## Created:      4/27/2017
## Last updated: 5/4/2017
## Dependencies: duplicity
#########################################################################

# Check if running as root
if [[ "$EUID" -ne 0 ]]; then exit 1; fi

# Make sure duplicity is installed
command -v duplicity >/dev/null 2>&1 || exit 1;

# Make sure the backup location is mounted
mountdir=/mnt/backup
mountpoint -q "$mountdir" || exit 1;

# Source the PASSPHRASE variable
. /root/.duplicitykey
export PASSPHRASE

# Use the absolute path for the duplicity command
dup="$(which duplicity)"

# Set the base backup directory
budir="$mountdir/$(hostname)"

# Set the base backup url
buurl="file://$budir"

# Set the backup log file
logdir=/var/log/duplicity
bulog="$logdir/duplicity_$(date +%Y%m%d)_backup.log"

# Make sure the log directory exists
mkdir -p "$logdir"

# Optionally, backup a mysql database
mysqldump --all-databases > "$budir/mysql_database_backup.sql"

# Add a header to the logs
echo -e "$(date)\n" >> "$bulog"

# This function will perform 3 steps:
# 1. Make sure the backup location exists
# 2. Run the backups
# 3. Remove all backups older than the last 3 full backups
# All output is saved to a separate file each day in /var/log/duplicity
function three_step {
	# Make sure the directory exists
	mkdir -p "$budir/$1"

	# Indicate which directory is being backed up in the logs
	{
	echo "###########################################################";
	echo "# BACKING UP /$1";
	echo "###########################################################";
	} >> "$bulog"
	
	# If a second argument exists, then exclude that from the backups.
	if [[ $2 ]]; then
		# Do a full backup every month. Otherwise, do an incremental.
		$dup --full-if-older-than 1M --exclude "**/$2" "/$1" "$buurl/$1" >> "$bulog" 2>&1
	else
		$dup --full-if-older-than 1M "/$1" "$buurl/$1" >> "$bulog" 2>&1
	fi
	
	# Keep only the last 3 full backups
	{
	echo "Removing old backups if necessary (keep 3 full backups)...";
	$dup remove-all-but-n-full 3 --force "$buurl/$1";
	echo -e "\n";
	} >> "$bulog" 2>&1
}

# Call the 'three_step' function for each directory you wish to backup
# A second argument can be added if there's a subdirectory you wish to exclude
# Leave off the leading slash "/"
three_step "etc/sampledir" "subdirectory"

# Delete old log files (keep 1 month)
find $logdir -mtime +31 -delete