#!/bin/sh
# Create daily, weekly or monthly snapshots from manual push backups

if [ "$1" == "" ]; then
	echo "Usage: $(basename $0) <backup level>"
	exit
fi

. /usr/local/etc/rs-backup/server-config

for home_dir in "${BACKUP_ROOT}"/*; do
	if [ -d "${home_dir}/${FILES_DIR}" ] && [ -e "${home_dir}/rsnapshot.conf" ]; then
		# Since we're relying on the client to push changes, there isn't
		# necessarily a new increment pushed yet.
		# Only rotate if there are really new increments to prevent
		# successive backup deletion
		config=$(cat "${BACKUP_ROOT}/etc/rsnapshot.global.conf")

		# Get number of preceding increments
		config=$(echo "${config}" | grep -P '^retain\t')
		config=$(echo "${config}" | grep -oPz "retain\t+(\w+)\t+(\d+)\nretain\s+${1}\t+" | sed -n 1p)
		preceding_name=$(echo "${config}" | awk '{ print $2 }')
		preceding_number=$(($(echo "${config}" | awk ' { print $3 }') - 1))
		
		# Continue if no proper preceding increment could be found
		if [ "${preceding_name}" == "" ] || 
		   [ ! -d "${home_dir}/${FILES_DIR}/${preceding_name}.${preceding_number}" ]; then
			echo "Not rotating ${1}"
			continue
		fi

		cd "${home_dir}/${FILES_DIR}"
		owner=$(ls -ld "${home_dir}/${FILES_DIR}" | awk '{ print $3 }')

		su - "${owner}" -c "rsnapshot -c '${home_dir}/rsnapshot.conf' '$1'"
	fi
done