#!/usr/bin/env bash
# 2024-01-29 Hyperling
# Create a backup file with a generic name for polling.

DIR="$(dirname -- "${BASH_SOURCE[0]}")"
PROG="$(basename -- "${BASH_SOURCE[0]}")"
echo "$DIR/$PROG"
source "$DIR/../source.env"

## Variables ##

TAG="Docker"
DATE="`date "+%Y%m%d-%H%M%S"`"
BACKUP_DIR="/srv/backup"
BASENAME="Backup"
file="$BACKUP_DIR/$BASENAME.$DATE.$HOSTNAME.$TAG.zip"
time="`which time`"

## Functions ##

function usage {
	cat <<- EOF
		Backup script for Hyperling's self-managed Docker setup.

		Usage: $PROG [-u] [-d] [-h]
			-u : Bring all containers up after the backup has finished.
			-d : Bring all containers down before taking the backup.
			-h : Display this help text.

		Example:
			$PROG -ud
	EOF

	exit $1
}

## Parameters ##

up=FALSE
down=FALSE

while getopts ':udh' opt; do
	case "$opt" in
		u) up=TRUE ;;
		d) down=TRUE ;;
		h) usage 0 ;;
		*) echo "ERROR: Option $OPTARG not recognized." >&2
			usage 1 ;;
	esac
done

## Main ##

# Ensure backup directory exists with correct permissions.
mkdir -pv "$BACKUP_DIR"
mkdir -pv "$BACKUP_DIR/TRASH"
chmod -Rv 775 "$BACKUP_DIR"
chown -Rv root:root "$BACKUP_DIR"

# Remove the last backup.
echo "`date` - Removing existing files."
cd "$BACKUP_DIR"
mv -v "$BASENAME"*"$TAG"* TRASH/
rm -v TRASH/*

if [[ "$down" == "TRUE" ]]; then
	echo -e "\n`date` - Take down services for a cold backup."
	manage.sh -d
else
	echo -e "\n`date` - Skipping take down."
fi

echo -e "\n`date` - Create the backup for '$DOCKER_HOME'."
$time zip -r "$file.tmp" \
	"$DOCKER_HOME" \
	/etc/crontab /etc/cron.d \
	/var/spool/cron /var/{log,mail} \
	--exclude "$DOCKER_HOME/Volumes/IGNORED/*" \
	1>/dev/null
mv -v "$file.tmp" "$file"

echo -e "\n`date` - Done with zipping, check size."
ls -sh "$file"

echo -e "\n`date` - Ensure other users can access the file."
chmod -v 755 "$file"

if [[ "$up" == "TRUE" ]]; then
	echo -e "\n`date` - Bring services back up."
	manage.sh -u
else
	echo -e "\n`date` - Skipping restoring services."
fi

## Finish ##

echo -e "\n`date` - Done!"
exit 0