#!/usr/bin/env zsh

# author:	Daniel Sommer <daniel.sommer@velvettear.de>
# license:	MIT

# check if we're running in a subshell, forbid direct execution
[[ "$ZSH_EVAL_CONTEXT" == "toplevel" ]] && printf "error: direct execution of this script is forbidden!\n" >&2 && exit 1

# get the "home" directory
home="$(dirname $(realpath "$0"))"

# check if .env file exists and source it
env="$home/$(hostname).env"
[[ ! -r "$env" ]] && printf "error: config file '"$env"' does not exist!\n" >&2 && exit 1
source "$env"
		
# check if backup directories are defined
[[ -z "$RESTIC_DIRECTORIES" ]] && printf "error: config file '"$env"' does not define any backup directories!\n" >&2 && exit 1

printf ">> starting restic backup to repository '"$RESTIC_REPOSITORY"'...\n"

# execute "pre" action if defined
[[ -n "$RESTIC_BACKUP_PRE" ]] && eval "$RESTIC_BACKUP_PRE"

for directory in ${RESTIC_DIRECTORIES[@]}; do
	seconds="$SECONDS"
	printf "\n> backing up '"$directory"'...\n"
	sudo --preserve-env -u "$RESTIC_USER" restic backup --verbose --no-scan --retry-lock 3h --no-cache "$directory"
	printf "> backup of '"$directory"' finished after "$(( $SECONDS - $seconds ))" seconds!\n"
done

# execute "post" action if defined
[[ -n "$RESTIC_BACKUP_POST" ]] && eval "$RESTIC_BACKUP_POST"

printf "\n>> restic backup finished after "$SECONDS" seconds!\n"