ansible/roles/s6-rc/templates/s6-rc.j2

#!/bin/sh
# {{ ansible_managed }}

# PROVIDE: s6-rc
# REQUIRE: NETWORKING daemon
# KEYWORD: shutdown

etc_dir="{{ s6_etc_dir }}"
scan_dir="{{ s6_scan_dir }}"
live_dir="{{ s6_live_dir }}"

EX_UNAVAILABLE=69
EX_CONFIG=78

. /etc/rc.subr

export PATH="$PATH:/usr/local/bin:/usr/local/sbin"

name=s6_rc
rcvar=s6_rc_enable
extra_commands="reload status"

start_cmd="s6_rc_start &"
stop_cmd="s6_rc_stop"
reload_cmd="s6_rc_reload"
status_cmd="s6_rc_status"

s6_timeout=300 # seconds
up_timeout=300000 # milliseconds
down_timeout=300000 # milliseconds
update_timeout=300000 # milliseconds

s6_wait()
{
	local i=0

	while ! s6-svscanctl -z "$scan_dir" 2>/dev/null; do
		if [ $i -ge $s6_timeout ]; then
			echo "Timeout waiting for s6-svscan." >&2
			return 1
		fi
		if [ $i -eq 0 ]; then
			echo -n "Waiting for s6-svscan." >&2
		else
			echo -n . >&2
		fi
		sleep 1
		i=$((i + 1))
	done
	if [ $i -gt 0 ]; then
		echo >&2
	fi
	return 0
}

s6_rc_init()
{
	if [ ! -e "$live_dir" ]; then
		s6-rc-init -l "$live_dir" "$scan_dir"
	fi
}

s6_rc_up()
{
	s6-rc -l "$live_dir" -v 2 -u -t "$up_timeout" change enabled
}

s6_rc_down()
{
	s6-rc -l "$live_dir" -v 2 -d -a -t "$down_timeout" change
}

s6_rc_start()
{
	if ! s6_wait; then
		return 1
	fi

	s6_rc_init
	s6_rc_up
}

s6_rc_stop()
{
	s6_rc_down
}

s6_rc_reload()
{
	local uuid="$(uuidgen)"

	cd "$etc_dir"
	echo "Compiling the s6-rc service definitions into a services database: $etc_dir/service -> $etc_dir/.compiled.$uuid."
	if ! s6-rc-compile -v 2 ".compiled.$uuid" service; then
		echo "Failed to compile the service definitions into a services database." >&2
		return $EX_CONFIG
	fi

	echo "Updating the running s6-rc service manager to the latest compiled services database: $etc_dir/.compiled.$uuid."
	if s6-rc-update -l "$live_dir" -v 2 -t $update_timeout "$etc_dir/.compiled.$uuid"; then
		echo "Marking the running services database as selected default configuration: .compiled.$uuid -> compiled."
		ln -shf ".compiled.$uuid" compiled

		echo "Deleting stale services databases."
		if ! find -s . -mindepth 1 -maxdepth 1 -type d -name '.compiled.*' -not -name ".compiled.$uuid" -print0 | xargs -0 rm -r; then
			echo "Failed to delete stale services databases." >&2
			return $EX_CONFIG
		fi
	else
		echo "Failed to update the running s6-rc manager to the latest service database." >&2
		return $EX_CONFIG
	fi
}

s6_rc_status()
{
	local result=0

	# Check if s6-svscan is responsive by asking it to invoke its reaper (almost a NOP)
	if s6-svscanctl -z "$scan_dir" 2>/dev/null; then
		echo "The s6-svscan supervisor is responsive."
	else
		echo "The s6-svscan supervisor is unavailable."
		result=1
	fi

	if [ -e "$live_dir" ]; then
		echo "The s6-rc service manager has been initialized."

		echo
		echo "These services are currently active:"
		s6-rc -l "$live_dir" -a list
	else
		echo "The s6-rc service manager is uninitalized."
		result=1
	fi

	return $result
}

load_rc_config $name
run_rc_command "$1"