#!/usr/bin/env bash

lockfile="/tmp/stupidbackup.lock"
exec 9>"$lockfile"
if ! flock -n 9
then    printf 'Only one running instance is allowed.\n';
        exit 1
fi

destination="/mnt/bigstorage/"
dontcare="-o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -o LogLevel=ERROR"
now=`date +"%Y-%m-%d"`
path_script="$(realpath "${BASH_SOURCE[-1]}")"
path_dir="$(dirname "$path_script")"

for domain in "login.wownero.com" "wownero.com" "git.wownero.com"; do
    host="root@$domain"
    tmpd=`ssh $dontcare "$host" "mktemp -d -t wow-XXXXXXXXXX"`

    if [ -z "$tmpd" ]
    then
      echo "[$domain] failed to create tmp directory"
      continue
    fi

    echo "[$domain] created $tmpd"

    scp $dontcare -rP22 "$path_dir/backup.sh" "$host:$tmpd/backup.sh"
    echo "[$domain] uploaded backup script"

    ssh $dontcare "$host" "cd $tmpd; bash $tmpd/backup.sh"
    echo "[$domain] executed backup script"

    scp $dontcare -rP22 "$host:$tmpd" "$destination/$now-$domain"
    echo "[$domain] downloaded backups"

    ssh $dontcare "$host" "rm -rf $tmpd"
    echo "[$domain] finished"
done

rm "$lockfile"

# delete old files
find $destination -type f -mtime +40 -delete
find $destination -type d -empty -delete