#!/bin/execlineb -S1
# the -S1 tells execline to substitute 1 positional parameter
# which for this file is: the name of the service directory

# TODO:
# a sane example of handling the arguments would be nice

# populate some variables
define RUN_USER jdoe
define INSTANCE_NAME jane
define MAIL_RCPT john
backtick HOME { homeof ${RUN_USER} }
importas -n -u HOME HOME

define LOGDIR ${HOME}/var/log/s6/imaginary_service-${INSTANCE_NAME}
define MAIL_FIFO ${LOGDIR}/mail_fifo

# redirect STDERR to STDIN so it can be caught by a logging service
fdmove -c 2 1

# switch to a different user for running this
s6-setuidgid ${RUN_USER}

# the command to start and supervise
s6-log
	# notify readiness
	-d3
	# prepend TAI64N timestamp
	t
	# prepent ISO 8601 timestamp
	T
	# rotate after 1MiB written
	s1048576
	# total size of logdir may be 2GiB
	S2147483648
	# filter lines with only spaces
	-"^[[:space:]]+$"
	# upon rotation, send log to MAIL_RCPT
	!"background { redirfd -r 0 ${MAIL_FIFO} mail -s \"instance log: ${INSTANCE_NAME}\" -- ${MAIL_RCPT} } tee ${MAIL_FIFO}"
	# directory to write logfiles to
	"${LOGDIR}/logs"