#!/bin/bash

# Crontab line.
#0 2 * * * bash /root/backup.sh | tee -a /var/log/backup_$(date +"\%Y-\%m-\%d").log

# Exit on error.
# Because I've been grilled about not using this - phillw, I'm looking
# at you ;)
set -e

# Where do we locally store the backups?
BACKUP_STORE='/backup'

# What directories do we backup?
# Each _full_ path must be seperated by a space. If a path uses a
# special char e.g, space or non-alphanumeric chars escape it with a
# backslash.
BACKUP_DIRS='/etc /home /var/www /root'

# A date string for file/folder-names.
SCRIPT_RUN_DATE=`date '+%Y-%m-%d-%H-%M'`

# Backup the above $BACKUP_DIRS. Set to 0 to disable.
BACKUP_DIRECTORIES_AND_FILES="1"

# CRON backup?  Set to 0 to disable.
BACKUP_CRON="1"

# MARIADB/MYSQL dump backup? Set to 0 to disable.
BACKUP_SQL="1"


## Edit below at own risk..
if [[ $EUID -ne 0 ]]; then
   echo 'run as root'
   exit 1
fi

# Before we do anything, switch to our backup store directory.
cd "${BACKUP_STORE:-/tmp/$SCRIPT_RUN_DATE}"

# Now make our backup directory using the script_run_date.
BACKUP_CWD="./${SCRIPT_RUN_DATE:-fail}"
mkdir "${BACKUP_CWD}"
cd "${BACKUP_CWD}"

if [[ "$BACKUP_DIRECTORIES_AND_FILES" == "1" ]]; then

    for OBJ in ${BACKUP_DIRS:-}; do
        OBJ_S=${OBJ//\//-}
        OBJ_S=${OBJ_S/-/}

        if [[ ! -f "${OBJ}" ]]; then
            if [[ ! -d "${OBJ}" ]]; then
                printf "\n!! file or directory \"%s\" not found, skipping..\n" "${OBJ}"
                continue;
            fi
        fi

        tar -cJf "./$OBJ_S.tar.xz" "${OBJ}"
    done

fi

if [[ "$BACKUP_SQL" == "1" ]]; then

    DATABASES="$(echo "show databases" | mysql | grep -Ev "^(Database|mysql|performance_schema|information_schema)$" | paste -sd " " -)"

    [[ -z "${DATABASES:-}" ]] && exit 1

    for DB in $DATABASES; do
        mysqldump --single-transaction --routines --events  --triggers --lock-tables $DB > "./$DB.sql" || exit 1;
    done

fi

if [[ "$BACKUP_CRON" == "1" ]]; then

    for USER in $(cut -f1 -d: /etc/passwd); do
        crontab -u $USER -l  > "${USER}-cron.txt" || continue;
    done

fi

echo "$SCRIPT_RUN_DATE OK" >> /var/log/$0-run.log