probe-cli

#!/bin/bash
if [[ $0 =~ ^(.*)/([^/]+)$ ]]; then
	WORKDIR="${BASH_REMATCH[1]}"
	CALLED="${BASH_REMATCH[2]}"
fi

## container name
CNAME="probe"
CLIENTRY="cli" # symlink in container

## list local shell env variables to be passed to container here
LENV=()
LENV+=("PROBE_SERVER_PORT")

## return specific running container env value
CENV=()
cget() {
	for ITEM in ${CENV[@]}; do
		if [[ ${ITEM} =~ ([_0-9a-zA-Z]+)=(.*)\" ]]; then
			if [[ "${BASH_REMATCH[1]}" == "${1}" ]]; then
				printf "${BASH_REMATCH[2]}"
			fi
		fi
	done
}

## compare defined local values against running container
lget() {
	local PASS=1
	for ITEM in ${LENV[@]}; do
		local LVAL=${!ITEM}
		local CVAL=$(cget ${ITEM})
		if [[ -n ${LVAL} && ${LVAL} != ${CVAL} ]]; then
			PASS=0
		fi
	done
	printf ${PASS}
}

## force stop and clear any dangling containers
cstop() {
	docker rm -f ${CNAME} 2>/dev/null
	docker rm -v $(docker ps -qa -f name=${CNAME} -f status=exited) 2>/dev/null
}

## start new instance of container with fresh env vars
cstart() {
	## build env string
	local DSTRING
	for ITEM in ${LENV[@]}; do
		local LVAL=${!ITEM}
		if [[ -n ${LVAL} ]]; then
			DSTRING+=" -e ${ITEM}"
		fi
	done
	#DSTRING+=" -v ${PWD}:/files"
	docker rm -v $(docker ps -qa -f name=${CNAME} -f status=exited) 2>/dev/null
	docker run -d -P --net host \
		--name ${CNAME} \
		${DSTRING} \
	"apnex/${CNAME}"
}

## handle autocomplete - don't attach psuedo-tty
cexec() {
	docker exec ${CNAME} ${CLIENTRY} "${@}"
}

## exec normal user commands
texec() {
	docker exec -t ${CNAME} ${CLIENTRY} "${@}"
}

# main
case "${1}" in
	'stop') ## force stop
		printf "[apnex/${CNAME}] stopping\n" 1>&2
		cstop
	;;
	*) # launch + persist (run + exec)
		RUNNING=$(docker ps -q -f name="${CNAME}")
		if [[ -n "$RUNNING" ]]; then
			CENV=$(docker inspect -f "{{json .Config.Env }}" ${CNAME} | tr "," "\n")
			if [[ $(lget) == 0 ]]; then
				# env match failed, restart container with new env
				cstop
				cstart
			fi
		else
			printf "[apnex/${CALLED}] not running - now starting\n" 1>&2
			cstart
		fi
		if [[ "${1}" = "ac" ]]; then
			cexec "${@:2}" ## called from bash.complete
		else
			texec "${@}" ## called from shell
		fi
	;;
esac