localstack_up.sh
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localstack_up.sh
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	#!/usr/bin/env bash

	set -euo pipefail

	# Avoid localstack attempt to write in the nix store
	XDG_DATA_HOME=''${XDG_DATA_HOME:-$HOME/.local/share}
	export FILESYSTEM_ROOT=''${XDG_DATA_HOME}/localstack/filesystem

	# Since docker is installed outside of nix, need to ensure that it was
	# installed impurely
	if ! command -v docker > /dev/null; then
	echo "Please install docker in order to use localstack" >&2
	exit 1
	fi

	if ! command -v localstack > /dev/null; then
	echo "Please install localstack cli in order to use localstack" >&2
	exit 1
	fi

	if [[ $(docker info 2>/dev/null) =~ "Cannot connect to the Docker" ]]; then
	echo "Localstack requires Docker to be running" >&2
	echo "Please start Docker and try again" >&2
	exit 1
	fi

	# The 'localstack status' command will poll forever if you have a newer
	# docker cli, so instead use docker ps + grep to determine running container
	if ! docker ps \| grep localstack &> /dev/null; then
	echo "Starting localstack..." >&2
	localstack start \
	--detached \
	--docker \
	--no-banner > /dev/null
	else
	echo "localstack is already running, skipping localstack initialization"
	fi

	# Explicitly exit this script so the parent shell can determine
	# when it's safe to return control of terminal to user
	exit 0