get-containers-list.sh
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get-containers-list.sh
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	#!/usr/bin/env bash

	# -------------------------------------------------------------
	# PaaS Docker
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	# Project: Nasqueron
	# Created: 2017-01-30
	# License: Trivial work, not eligible to copyright
	# Source file: roles/paas-docker/systemd-unit/files/get-containers-list.sh
	# -------------------------------------------------------------
	#
	# <auto-generated>
	# This file is managed by our rOPS SaltStack repository.
	#
	# Changes to this file may cause incorrect behavior
	# and will be lost if the state is redeployed.
	# </auto-generated>

	## Read /etc/containers.conf and recover docker’s names into an array.
	## get-containers-list [--reverse]

	file='/etc/containers.conf'

	if [[ ! -f "$file" ]]; then
	echo "$file : does not exists "
	exit 1
	elif [[ ! -r "$file" ]]; then
	echo "$file : can not read "
	fi

	# Get names in an array
	# 21:42 <geirha> since bash 4, you can use mapfile instead of that
	# while read loop. mapfile -t array < "$file"
	mapfile -t array < "$file"

	# Test argument to know in wich order return names
	if [[ $1 == "--reverse" ]]; then
	for ((i="${#array[*]}" - 1; i >= 0; i--)); do
	echo "${array[i]}"
	done
	elif [[ -z "$1" ]]; then
	for ((i=0; i < "${#array[*]}"; i++)); do
	echo "${array[i]}"
	done
	else
	echo "$1 is not a valid argument"
	fi