#!/bin/bash

function join {
	local d=$1;
	shift;
	local p=$1;
	shift;
	echo -n "$p$1";
	shift;
	printf "%s" "${@/#/$d$p}";
}

if ! lockfile-create -p -r 2 $0; then
	echo "Another backup is running, aborting"
	exit 1
fi
 
### Program arguments ###

# Backup target directory
BACKUP_TARGET=$1

# Backup local directory
BACKUP_DIRECTORY=$2

# Exclusions
BACKUP_EXCLUSIONS=$(join " " "--exclude=" $3)
echo "Exclusions: $BACKUP_EXCLUSIONS"

# Script executed before starting the backup
BEFORE_SCRIPT=$4

# Script executed after finishing the backup
AFTER_SCRIPT=$5

# Backup root path, change it to create a new backup
BACKUP_ROOT=$6

# Backup archive path, change it for each backup
BACKUP_ARCHIVE=$7


### Backup automatic properties ###
BACKUP_ROOT_PATH="$(cat /etc/hostname)"
BACKUP_BASE_PATH="$BACKUP_ROOT_PATH/$BACKUP_ROOT"
BACKUP_CONTENTS_PATH="$BACKUP_BASE_PATH/_backup/"


echo "Starting backup. Target: $BACKUP_BASE_PATH. Archive: $BACKUP_ARCHIVE"

### Before Script ###
eval "$BEFORE_SCRIPT"

### Create local model of the remote's backup directory tree and send it ###
mkdir -p "$BACKUP_CONTENTS_PATH"
rsync --timeout=30 -avzhP --relative $BACKUP_CONTENTS_PATH $BACKUP_TARGET

### Backup home directory except some unwanted files ###
rsync --timeout=30 -avzhP --delete --inplace $BACKUP_EXCLUSIONS --backup --backup-dir=../$BACKUP_ARCHIVE $BACKUP_DIRECTORY $BACKUP_TARGET/$BACKUP_CONTENTS_PATH

### Remove local model of the backup directory tree ###
rm -R "$BACKUP_ROOT_PATH"

### After Script ###
eval "$AFTER_SCRIPT"


# Remove lock
echo "Backup finished. Removing lock..."
lockfile-remove $0