#!/bin/sh

# Purpose {{{
## Backup data of a Docker container.
## To do that, the script will :
##	Try to stop the corresponding container (or docker if no related service is found)
##	Make a archive of the container's data to a backup path
##	Clean old backup
##	Restart the container service (or docker.service)
# }}}
# How-to use {{{
## The container and it's data directory should have the same name.
# }}}

# Vars {{{
DEBUG=0

# }}}

# Tests {{{

# Expect at least 1 argument and 3 maximum {{{
case $# in
	1 )
		ct_name="${1}"
		## Absolut path to the container data
		docker_data_path="/srv/docker"
		## Absolut path to store the archives.
		## A sub-directory will be created for the container
		docker_backup_path="/mnt/backup/docker"
		;;
	2 )
		ct_name="${1}"
		docker_data_path="${2}"
		docker_backup_path="/mnt/backup/docker"
		;;
	3 )
		ct_name="${1}"
		docker_data_path="${2}"
		docker_backup_path="${3}"
		;;
	* )
		cat << HELP

container.backup  --
Backup data of a given Docker container.

EXAMPLE :
    - Backup data of FIRST_DOCK container
        container.backup FIRST_DOCK

HELP

		exit 1
		;;
esac

	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Args management  — Container name to backup : ${ct_name} ."
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Args management  — Path to Docker data : ${docker_data_path} ."
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Args management  — Path to store the backup : ${docker_backup_path} ."

# }}}
## Ensure Docker data directory exists {{{
if [ ! -d "${docker_data_path}" ]; then
	printf '\e[0;31m%-6s\e[m\n' "Docker data directory doesn't seems available : ${docker_data_path} ."
	exit 1
fi
## }}}
## Ensure backup directory exists {{{
if [ ! -d "${docker_backup_path}" ]; then
	printf '\e[0;31m%-6s\e[m\n' "Backup directory doesn't seems available : ${docker_backup_path} ."
	exit 1
fi
## }}}
## Ensure container data directory exists {{{
if [ ! -d "${docker_data_path}/${ct_name}" ]; then
	printf '\e[0;31m%-6s\e[m\n' "Container directory doesn't seems available : ${docker_data_path}/${ct_name} ."
	exit 1
fi
## }}}

# }}}

exit 0