host-exec

#!/bin/bash

set -e

if [[ -z $TOP_DIR ]]; then
	echo "TOP_DIR not set"
	exit 1
fi

service_name="$1"
service_program="$2"
shift 2

space=$' '
tab=$'\t'
newline=$'\n'
cr=$'\r'

# The docker-compose .env file is *not* compatible with shell.  Quotes
# become part of the variable.  Hence the need for this complex
# function.

compose_env_has_been_read=
declare -A compose_envvar
compose_env_read() {
	[[ ! -e $1 ]] && return
	local continuation= line name value
	while read line; do
		if [[ $continuation ]]; then
			if [[ $line =~ '\\'$ ]]; then
				value+="${line%\\}"
			else
				compose_envvar["$name"]="$value$line"
				continuation=
			fi
		else
			if [[ $line =~ ^[$space$tab]*'#' ]]; then
				: #comment
			elif [[ $line =~ ^[$space$tab]*([^=$space$tab]+)'='(.*)$ ]]; then
				name="${BASH_REMATCH[1]}"
				value="${BASH_REMATCH[2]}"
				if [[ $value =~ \\$ ]]; then
					value="${value%\\}"
					continuation=1
				else
					compose_envvar["$name"]="$value"
				fi
			elif [[ $line = '' ]]; then
				:
			else
				echo "Can't parse line: $line"
				exit 1
			fi
		fi
	done < "$1"
}

compose_env_load() {
	compose_env_read "$TOP_DIR/.env.defaults"
	compose_env_read "$TOP_DIR/.env"
	compose_env_has_been_read=1
	# redefine the current function, to speed up subsequence runs.
	compose_env_load() { return; }
}

if [[ -z $COMPOSE_PROJECT_NAME ]]; then
	compose_env_load
	COMPOSE_PROJECT_NAME="${compose_envvar[COMPOSE_PROJECT_NAME]}"
fi
if [[ -z $COMPOSE_PROJECT_NAME ]]; then
	COMPOSE_PROJECT_NAME="${TOP_DIR##*/}"
	COMPOSE_PROJECT_NAME="${COMPOSE_PROJECT_NAME//[_ ]}"
fi
export COMPOSE_PROJECT_NAME

container_name="${COMPOSE_PROJECT_NAME}_${service_name}_1"

run_compose() {
	docker-compose -f "$1" up -d "$service_name"
	# TODO: implement wait for healthcheck
}

start_compose_service() {
	declare file
	for file in docker-compose.yml docker-compose.yaml; do
		if [[ -f $TOP_DIR/$file ]]; then
			run_compose "$TOP_DIR/$file"
			return
		fi
	done
	for file in docker-compose.localdev.yml docker-compose.production.yml; do
		if [[ -f $TOP_DIR/$file ]]; then
			ln -sf "$file" "$TOP_DIR/docker-compose.yml"
			run_compose "$TOP_DIR/docker-compose.yml"
			return
		fi
	done
	echo "Could not find docker-compose.yml!" 1>&2
	exit 1
}

while :; do
	status="$(docker container inspect -f '{{.State.Status}}' "$container_name" 2>/dev/null)" || true
	case "$status" in
		(running)
			break
			;;
		(exited)
			docker container start "$container_name"
			;;
		('')
			start_compose_service
			;;
		(*)
			echo "Unknown status: $status"
			exit 1
			;;
	esac
done
t_flag=-i
tty -s && t_flag="-i -t"
exec docker exec \
	-e MAP_TERM="$([[ $TERM ]] && tput cols):$([[ $TERM ]] && tput lines):$TERM" \
	-e MAP_TOP_DIR="$TOP_DIR" \
	-e MAP_PWD="$PWD" \
	-e MAP_USER="$(id)" \
	-e MAP_UMASK="$(umask)" \
	$t_flag "$container_name" \
	/usr/local/share/container/scripts/exec "${service_program}" \
	"$@"