# Copyright 1999-2023 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

# @ECLASS: s6.eclass
# @MAINTAINER:
# William Hubbs <williamh@gentoo.org>
# @SUPPORTED_EAPIS: 8
# @BLURB: helper functions to install s6 services
# @DESCRIPTION:
# This eclass provides helpers to install s6 services.
# @EXAMPLE:
#
# @CODE
# inherit s6
#
# src_install() {
#	...
#	s6_install_service myservice "${FILESDIR}"/run-s6 "${FILESDIR}"/finish-s6
#	...
#	If you want a service to be logged, install the log service as
#	shown here.
#	s6_install_service myservice/log "${FILESDIR}"/log-run-s6 \
#		"${FILESDIR}"/log-finish-s6
#	...
# }
# @CODE

case ${EAPI} in
	8) ;;
	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
esac

# @FUNCTION: _s6_get_servicedir
# @INTERNAL
# @DESCRIPTION:
# Get unprefixed servicedir.
_s6_get_servicedir() {
	echo /var/svc.d
}

# @FUNCTION: s6_get_servicedir
# @DESCRIPTION:
# Output the path for the s6 service directory (not including ${D}).
s6_get_servicedir() {
	debug-print-function ${FUNCNAME} "$@"

	echo "${EPREFIX}$(_s6_get_servicedir)"
}

# @FUNCTION: s6_install_service
# @USAGE: <servicename> <run> [finish]
# @DESCRIPTION:
# Install an s6 service.
# servicename is the name of the service.
# run is the run script for the service.
# finish is the optional finish script for the service.
s6_install_service() {
	debug-print-function ${FUNCNAME} "$@"

	local name="$1"
	local run="$2"
	local finish="$3"

	[[ -z ${name} ]] &&
		die "${ECLASS}.eclass: you must specify the s6 service name"
	[[ -z ${run} ]] &&
		die "${ECLASS}.eclass: you must specify the s6 service run script"

	(
		local servicepath="$(_s6_get_servicedir)/${name}"
		exeinto "${servicepath}"
		newexe "${run}" run
		[[ -n ${finish} ]] && newexe "${finish}" finish
	)
}

# @FUNCTION: s6_service_down
# @USAGE: <servicename>
# @DESCRIPTION:
# Install the "down" flag so this service will not be started by
# default.
# servicename is the name of the service.
s6_service_down() {
	debug-print-function ${FUNCNAME} "$@"

	local name="$1"
	[[ -z ${name} ]] &&
		die "${ECLASS}.eclass: you must specify the s6 service name"

	(
		touch "${T}"/down || die
		local servicepath="$(_s6_get_servicedir)/${name}"
		insinto "${servicepath}"
		doins "${T}"/down
	)
}

# @FUNCTION: s6_service_nosetsid
# @USAGE: <servicename>
# @DESCRIPTION:
# Install the "nosetsid" flag so this service will not be made a session
# leader.
# servicename is the name of the service.
s6_service_nosetsid() {
	debug-print-function ${FUNCNAME} "$@"

	local name="$1"
	[[ -z ${name} ]] &&
		die "${ECLASS}.eclass: you must specify the s6 service name"

	(
		touch "${T}"/nosetsid || die
		local servicepath="$(_s6_get_servicedir)/${name}"
		insinto "${servicepath}"
		doins "${T}"/nosetsid
	)
}