Add support for the s6 supervision suite

This commit is contained in:
William Hubbs 2015-05-11 18:07:28 -05:00
parent 0f9354becf
commit bb2d7becfd
7 changed files with 151 additions and 2 deletions

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@ -3,7 +3,7 @@ include ../mk/net.mk
DIR= ${INITDIR}
SRCS= bootmisc.in fsck.in hostname.in local.in localmount.in loopback.in \
netmount.in osclock.in root.in savecache.in swap.in swapfiles.in \
tmpfiles.setup.in swclock.in sysctl.in urandom.in ${SRCS-${OS}}
tmpfiles.setup.in swclock.in sysctl.in urandom.in s6-svscan.in ${SRCS-${OS}}
BIN= ${OBJS}
# Are we installing our network scripts?

31
init.d/s6-svscan.in Normal file
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@ -0,0 +1,31 @@
#!@SBINDIR@/openrc-run
# Copyright (C) 2015 William Hubbs <w.d.hubbs@gmail.com>
# Released under the 2-clause BSD license.
command=/bin/s6-svscan
command_args="${RC_SVCDIR}"/s6-scan
command_background=yes
pidfile=/var/run/s6-svscan.pid
depend()
{
need localmount
}
start_pre()
{
einfo "Creating s6 scan directory"
checkpath -d -m 0755 "$RC_SVCDIR"/s6-scan
return $?
}
stop_post()
{
ebegin "Stopping any remaining s6 services"
s6-svc -dx "${RC_SVCDIR}"/s6-scan/* 2>/dev/null || true
eend $?
ebegin "Stopping any remaining s6 service loggers"
s6-svc -dx "${RC_SVCDIR}"/s6-scan/*/log 2>/dev/null || true
eend $?
}

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@ -107,6 +107,18 @@ the service has already been stopped.
String describing the service.
.It Ar description_$command
String describing the extra command.
.It Ar supervisor
Supervisor to use to monitor this daemon. If this is unset,
start-stop-daemon will be used. The only alternate supervisor we support
in this release is S6 from Skarnet software. To use this, set
supervisor=s6.
.It Ar s6_service_path
The path to the s6 service directory if you are monitoring this service
with S6. The default is /etc/svc.d/${RC_SVCNAME}.
.It Ar s6_svwait_options_start
The options to pass to s6-svwait when starting the service via s6.
.It Ar s6_svwait_options_stop
The options to pass to s6-svwait when stopping the service via s6.
.It Ar start_stop_daemon_args
List of arguments passed to start-stop-daemon when starting the daemon.
.It Ar command

56
s6-guide.md Normal file
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@ -0,0 +1,56 @@
# Using S6 with OpenRC
Beginning with OpenRC-0.16, we support using the s6 supervision suite
from Skarmet Software in place of start-stop-daemon for monitoring
daemons [1].
## Setup
Documenting s6 in detail is beyond the scope of this guide. It will
document how to set up OpenRC services to communicate with s6.
### Use Default start, stop and status functions
If you write your own start, stop and status functions in your service
script, none of this will work. You must allow OpenRC to use the default
functions.
### Dependencies
All OpenRC service scripts that want their daemons monitored by s6
should have the following line added to their dependencies to make sure
the s6 scan directory is being monitored.
need s6-svscan
### Variable Settings
The most important setting is the supervisor variable. At the top of
your service script, you should set this variable as follows:
supervisor=s6
Several other variables affect s6 services. They are documented on the
openrc-run man page, but I will list them here for convenience:
s6_service_path - the path to the s6 service directory
s6_svwait_options_start - the options to pass to s6-svwait when starting
s6_svwait_options_stop - the options to pass to s6-svwait when stopping.
The s6_service_path variable defaults to /etc/svc.d/${RC_SVCNAME} if it
is not set in the service script. For example, if you want a service
script called /etc/init.d/foobar to use s6 to monitor its daemon, the s6
service should be the directory /etc/svc.d/foobar.
See the documentation for s6 for more information about s6 service
directories.
The s6_svwait_options_* variables set command line options to pass to
s6-svwait when starting or stopping the s6 service. These can be very
useful for waiting for s6 services to signal when they are up, timing out
when an s6 service doesn't come up, etc.
This is very early support, so feel free to file bugs if you have
issues.
[1] https://www.skarnet.org/software/s6

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@ -1,7 +1,7 @@
DIR= ${LIBEXECDIR}/sh
SRCS= init.sh.in functions.sh.in gendepends.sh.in \
openrc-run.sh.in rc-functions.sh.in tmpfiles.sh.in ${SRCS-${OS}}
INC= rc-mount.sh functions.sh rc-functions.sh start-stop-daemon.sh
INC= rc-mount.sh functions.sh rc-functions.sh s6.sh start-stop-daemon.sh
BIN= gendepends.sh init.sh openrc-run.sh tmpfiles.sh ${BIN-${OS}}
INSTALLAFTER= _installafter

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@ -132,6 +132,7 @@ start()
{
local func=ssd_start
case "$supervisor" in
s6) func=s6_start ;;
?*)
ewarn "Invalid supervisor, \"$supervisor\", using start-stop-daemon"
;;
@ -143,6 +144,7 @@ stop()
{
local func=ssd_stop
case "$supervisor" in
s6) func=s6_stop ;;
?*)
ewarn "Invalid supervisor, \"$supervisor\", using start-stop-daemon"
;;
@ -154,6 +156,7 @@ status()
{
local func=ssd_status
case "$supervisor" in
s6) func=s6_status ;;
?*)
ewarn "Invalid supervisor, \"$supervisor\", using start-stop-daemon"
;;
@ -183,6 +186,7 @@ unset _conf_d
sourcex -e "@SYSCONFDIR@/rc.conf"
# load service supervisor functions
sourcex "@LIBEXECDIR@/sh/s6.sh"
sourcex "@LIBEXECDIR@/sh/start-stop-daemon.sh"
# Set verbose mode

46
sh/s6.sh Normal file
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@ -0,0 +1,46 @@
# Start / stop / status functions for s6 support
# Copyright (c) 2015 William Hubbs <w.d.hubbs@gmail.com>
# Released under the 2-clause BSD license.
[ -z "${s6_service_path}" ] && s6_service_path="/etc/svc.d/${RC_SVCNAME}"
s6_start()
{
if [ ! -d "${s6_service_path}" ]; then
eerror "${s6_service_path} does not exist."
return 1
fi
local rc
ebegin "Starting ${name:-$RC_SVCNAME}"
ln -sf "${s6_service_path}" "${RC_SVCDIR}"/s6-scan
s6-svscanctl -an "${RC_SVCDIR}"/s6-scan
rc=$?
if [ -n "$s6_svwait_options_start" ]; then
s6-svwait ${s6_svwait_options_start} "${s6_service_path}"
rc=$?
fi
eend $rc "Failed to start $RC_SVCNAME"
}
s6_stop()
{
if [ ! -d "${s6_service_path}" ]; then
eerror "${s6_service_path} does not exist."
return 1
fi
local rc
ebegin "Stopping ${name:-$RC_SVCNAME}"
rm -rf "${RC_SVCDIR}/s6-scan/${s6_service_path##*/}"
s6-svscanctl -an "${RC_SVCDIR}"/s6-scan
rc=$?
if [ -n "$s6_svwait_options_stop" ]; then
s6-svwait ${s6_svwait_options_stop} "${s6_service_path}"
rc=$?
fi
eend $rc "Failed to stop $RC_SVCNAME"
}
s6_status()
{
s6-svstat "${s6_service_path}"
}