Package: runit
Version: 2.1.1-6.2
Severity: wishlist
Tags: patch
Hi,
Since the release of 2.88dsf-23 of sysv-rc, dependency based boot ordering
is mandatory in Debian; however, insserv fails to recognise symlinks to
/usr/bin/sv as valid initscripts.
This makes using runit unnecessarily painful; to ease the pain, I wrote a
pretty complete start-stop-daemon wrapper for runit (alas, in zsh).
Diverting /sbin/start-stop-daemon to /sbin/start-stop-daemon.real and using
this script, conventional initscripts continue to "work". My script
determines whether it should pass the call through to the real
start-stop-daemon or to use sv(8) to manage a runit service.
While it's a bit of a kludge, it appears to work fairly well.
An important drawback is that it needs to be adapted each time the semantics
of start-stop-daemon change, but maybe that doesn't happen so often.
The script uses few zsh-specific features; a determined person should be
able to modify it to run in bash or even plain sh relatively easily (but I
have no time/interest to do so myself).
The script is licensed under the GPL v3, with the special exception that
permission is granted to include it in the runit package and license it to
users of the runit package under the same license as the rest of the
package.
Work on the script was sponsored by CAE Engineering Kft.
Best regards,
Andras
--
Andras Korn <korn at elan.rulez.org>
All that glitters may not be gold, but it sure has a high refractive index.
#!/bin/zsh
#
# This script is intended to wrap start-stop-daemon. It will call the
# original start-stop-daemon with the supplied arguments unless the daemon
# to be started appears to exist as a runit service, in which case it will
# map the start-stop-daemon call to an sv(8) call.
#
# If called by non-root user, fall back to original start-stop-daemon
# unconditionally
[[ $UID -gt 0 ]] && exec /sbin/start-stop-daemon.real $@
set -A args $@
SVDIR=${SVDIR:-/etc/service}
unset mode signal exec timeout startas testmode oknodo quiet verbose command
svstat
oknodo=0
quiet=0
while [[ -n "$1" ]]; do
case "$1" in
-S|--start)
mode=start
;;
-K|--stop)
mode=stop
;;
-T|--status)
mode=status
;;
-H|--help|-V|--version)
exec /sbin/start-stop-daemon.real $args
;;
-x|--exec)
shift
exec="$1"
;;
-s|--signal)
shift
signal=$1
;;
--signal=*)
signal="${1/--signal=/}"
;;
-R|--retry)
shift
timeout="$1"
;;
--retry=*)
timeout="${1/--retry=/}"
;;
-a|--startas)
shift
startas="$1"
;;
-t|--test)
testmode=1
;;
-o|--oknodo)
oknodo=1
;;
-q|--quiet)
quiet=1
exec >/dev/null
;;
-v|--verbose)
verbose=1
;;
-p|--pidfile|-n|--name|-u|--user|-g|--group|-r|--chroot|-d|--chdir|-N|--nicelevel|-P|--procsched|-I|--iosched|-k|--umask|-m|--make-pidfile)
# ignored
shift
;;
--pidfile=*|-b|--background|--nicelevel=*|--procsched=*|--iosched=*|--umask=*)
;;
--)
# What follows is args to the daemon. Avoid parsing
# those accidentally.
break
;;
*)
# Assume the previous was the last option; the rest
# is the name of the daemon plus args, of which we
# only care about the daemon.
command=$1
break
;;
esac
shift
done
# Try to infer runit service name. If our parent is an initscript, use its
# basename
read foo script foo </proc/$PPID/cmdline
if [[ "${script:h}" = /etc/init.d ]]; then
svname=${script:t}
elif [[ "${$(readlink -f /proc/$PPID/exe):h}" = /etc/init.d ]]; then
read svname < /proc/$PPID/comm
fi
# if not, try other heuristics
svnames=($startas $exec $command)
while ! [[ -d $SVDIR/$svname/supervise/. ]] && [[ -n "$svnames[1]" ]]; do
svname=${svnames[1]:t}
shift svnames
done
# if runit service doesn't exist, call real start-stop-daemon.
if ! [[ -d $SVDIR/$svname/supervise/. ]] || [[ -z "$svname" ]]; then
exec /sbin/start-stop-daemon.real $args
fi
# otherwise, do what we've been asked to
[[ "$quiet" = "0" ]] && [[ "$verbose" = "1" ]] && echo
"start-stop-daemon.runit: will act on $svname service." >&2
function sendsig() {
case "$signal" in
HUP|1)
sv hup $svname
;;
INT|2)
sv interrupt $svname
;;
QUIT|3)
sv quit $svname
;;
KILL|9)
sv kill $svname
;;
USR1|10)
sv 1 $svname
;;
USR2|12)
sv 2 $svname
;;
ALRM|14)
sv alarm $svname
;;
TERM|15)
sv down $svname
;;
CONT|18)
sv cont $svname
;;
STOP|19)
sv pause $svname
;;
*)
echo "$0: ERROR: don't know how to send $signal signal
to $svname." >&2
exit 3
;;
esac
}
function wait_until_exited() {
counter=0
read svstat < $SVDIR/$svname/supervise/stat
while ! [[ "$svstat" = down ]]; do
((counter++))
[[ $counter -gt $timeout ]] && return 1
sleep 1
read svstat < $SVDIR/$svname/supervise/stat
done
return 0
}
function do_stop() {
if [[ $timeout =~ / ]]; then
# handle complex schedule
OLDIFS="$IFS"
IFS=/
echo $timeout | read -A schedule
IFS="$OLDIFS"
while [[ -n "$schedule[1]" ]]; do
signal=$schedule[1]
sendsig
shift schedule
timeout=$schedule[1]
wait_until_exited && exit 0
shift schedule
done
exit 2
else
# simple timeout
if [[ -z "$signal" ]]; then
if [[ $timeout =~ ^[0-9]+$ ]]; then
export SVWAIT=$timeout
fi
if sv stop $svname; then
exit 0
else
exit 1
fi
else
sendsig
[[ -n "$timeout" ]] && if wait_until_exited; then
exit 0
else
exit 1
fi
fi
fi
}
read svstat < $SVDIR/$svname/supervise/stat
case "$mode" in
start)
[[ "$svstat" = run ]] && [[ "$oknodo" = "0" ]] && exit 1 #
Emulate start-stop-daemon semantics
[[ -z "$testmode" ]] && sv start $svname
exit 0
;;
stop)
[[ "$svstat" = down ]] && [[ "$oknodo" = "1" ]] && exit 1 #
Emulate start-stop-daemon semantics
[[ -z "$testmode" ]] && do_stop # handles --retry and --signal,
therefore separate function
;;
status)
case "$svstat" in
# States are complex; we only handle the most basic cases here and bail on
# the rest (e.g. "finish" cannot be correctly reported as "running" or "not
# running")
run)
exit 0
;;
down)
exit 3
;;
*)
exit 4
;;
esac
;;
esac
exit 0
