#!/bin/sh

# Purpose {{{
## Ask to backup data of all Docker containers with a second script.
# }}}
# How-to use {{{
## 1. Needs container.backup script, in the same directory
## cf. https://git.ipr.univ-rennes1.fr/cellinfo/scripts/src/master/docker/container.backup
# wget https://git.ipr.univ-rennes1.fr/cellinfo/scripts/src/master/docker/container.backup
## First argument should be the path to store the backup.
## Second argument can be the absolut path to the Docker directory for containers.
# }}}

# Vars {{{
DEBUG=1

script_wd=$(dirname "${0}")

## Manage arguments {{{
## Expect at least 1 argument and 2 maximum
case $# in
	1 )
		## Absolut path to store the archives.
		## A sub-directory will be created for each container
		docker_backup_path="${1}"
		## Absolut path to Docker containers
		docker_ct_path="/srv/dock"
		;;
	2 )
		docker_backup_path="${1}"
		docker_ct_path="${2}"
		;;
	* )
		cat << HELP

container.backup.all  --
Backup all data of all Docker's containers.

EXAMPLE :
    - Backup all data of default Docker path (/srv/dock) to /media/usb/docker.backup
        container.backup.all /media/usb/docker.backup
    - Choose a specific path where containers are stored
        container.backup.all /media/usb/docker.backup /my/path/to/docker

HELP

		exit 1
		;;
esac
## }}}

temp_ct_list_file="/tmp/container.list"

# }}}

# Tests {{{

## Ensure backup directory exists {{{
if [ ! -d "${docker_backup_path}" ]; then
	printf '\e[0;31m%-6s\e[m\n' "Backup directory doesn't seems available : ${docker_backup_path} ."
	exit 1
else
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test arg  — Path to store the backup : ${docker_backup_path} ."
fi
## }}}
## Ensure Docker directory exists {{{
if [ ! -d "${docker_ct_path}" ]; then
	printf '\e[0;31m%-6s\e[m\n' "Docker data directory doesn't seems available : ${docker_ct_path} ."
	exit 1
else
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : Test arg  — Path to Docker data : ${docker_ct_path} ."
fi
## }}}
# }}}

# Get the list of containers name to backup
find "${docker_ct_path}" -mindepth 1 -maxdepth 1 -type d > "${temp_ct_list_file}"

# For each container in the list
while IFS= read -r ct_path
do
	[ "${DEBUG}" -eq "0" ] && printf '\e[1;35m%-6s\e[m\n' "DEBUG : While loop  — The data of ${ct_path} container will be backup."
	"${script_wd}/container.backup" "${ct_path}" "${docker_backup_path}"
done < "${temp_ct_list_file}"

# Clean temp file
rm -f -- "${temp_ct_list_file}"
# }}}

exit 0