No-frills init/rc replacement for running SysV services in a docker container

rc.sh

#!/bin/sh

# This is a wrapper script around a regular SysV service

_services=
while [ $# -gt 0 ]; do
	if [ -x "$1" ]; then
		_service=$1
		shift
	else
		echo "ERROR: Cannot find $1 in the image" >&2
		exit 1
	fi
	_services="${_services} ${_service}"
done

shutdown() {
	_reverse_services=`echo ${_services} | tr ' ' '\n' | awk '{a[i++]=$0} END {for (j=i-1; j>=0;) print a[j--] }'`
	for _service in ${_reverse_services}; do
		"${_service}" stop
	done
}

trap shutdown EXIT

# Execute the commands given 
for _service in ${_services}; do
	"${_service}" start
done

# And wait ...
while sleep 1000; do :; done