Current File : //snap/core20/2434/sbin/invoke-rc.d
#!/bin/sh
# vim: ft=sh
#
# invoke-rc.d.sysvinit - Executes initscript actions
#
# SysVinit /etc/rc?.d version for Debian's sysvinit package
#
# Copyright (C) 2000,2001 Henrique de Moraes Holschuh <hmh@debian.org>
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 2 of the License, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
# Constants
RUNLEVELHELPER=/sbin/runlevel
POLICYHELPER=/usr/sbin/policy-rc.d
INITDPREFIX=/etc/init.d/
RCDPREFIX=/etc/rc
# Options
BEQUIET=
MODE=
ACTION=
FALLBACK=
NOFALLBACK=
FORCE=
RETRY=
RETURNFAILURE=
RC=
is_systemd=
is_openrc=
SKIP_SYSTEMD_NATIVE=
# Shell options
set +e
dohelp () {
#
# outputs help and usage
#
cat <<EOF
invoke-rc.d, Debian/SysVinit (/etc/rc?.d) initscript subsystem.
Copyright (c) 2000,2001 Henrique de Moraes Holschuh <hmh@debian.org>
Usage:
invoke-rc.d [options] <basename> <action> [extra parameters]
basename - Initscript ID, as per update-rc.d(8)
action - Initscript action. Known actions are:
start, [force-]stop, [try-]restart,
[force-]reload, status
WARNING: not all initscripts implement all of the above actions.
extra parameters are passed as is to the initscript, following
the action (first initscript parameter).
Options:
--quiet
Quiet mode, no error messages are generated.
--force
Try to run the initscript regardless of policy and subsystem
non-fatal errors.
--try-anyway
Try to run init script even if a non-fatal error is found.
--disclose-deny
Return status code 101 instead of status code 0 if
initscript action is denied by local policy rules or
runlevel constrains.
--query
Returns one of status codes 100-106, does not run
the initscript. Implies --disclose-deny and --no-fallback.
--no-fallback
Ignores any fallback action requests by the policy layer.
Warning: this is usually a very *bad* idea for any actions
other than "start".
--skip-systemd-native
Exits before doing anything if a systemd environment is detected
and the requested service is a native systemd unit.
This is useful for maintainer scripts that want to defer systemd
actions to deb-systemd-invoke
--help
Outputs help message to stdout
EOF
}
printerror () {
#
# prints an error message
# $* - error message
#
if test x${BEQUIET} = x ; then
echo `basename $0`: "$*" >&2
fi
}
formataction () {
#
# formats a list in $* into $printaction
# for human-friendly printing to stderr
# and sets $naction to action or actions
#
printaction=`echo $* | sed 's/ /, /g'`
if test $# -eq 1 ; then
naction=action
else
naction=actions
fi
}
querypolicy () {
#
# queries policy database
# returns: $RC = 104 - ok, run
# $RC = 101 - ok, do not run
# other - exit with status $RC, maybe run if $RETRY
# initial status of $RC is taken into account.
#
policyaction="${ACTION}"
if test x${RC} = "x101" ; then
if test "${ACTION}" = "start" || test "${ACTION}" = "restart" || test "${ACTION}" = "try-restart"; then
policyaction="(${ACTION})"
fi
fi
if test "x${POLICYHELPER}" != x && test -x "${POLICYHELPER}" ; then
FALLBACK=`${POLICYHELPER} ${BEQUIET} ${INITSCRIPTID} "${policyaction}" ${RL}`
RC=$?
formataction ${ACTION}
case ${RC} in
0) RC=104
;;
1) RC=105
;;
101) if test x${FORCE} != x ; then
printerror Overriding policy-rc.d denied execution of ${printaction}.
RC=104
else
printerror policy-rc.d denied execution of ${printaction}.
fi
;;
esac
if test x${MODE} != xquery ; then
case ${RC} in
105) printerror policy-rc.d query returned \"behaviour undefined\",
printerror assuming \"${printaction}\" is allowed.
RC=104
;;
106) formataction ${FALLBACK}
if test x${FORCE} = x ; then
if test x${NOFALLBACK} = x ; then
ACTION="${FALLBACK}"
printerror executing ${naction} \"${printaction}\" instead due to policy-rc.d request.
RC=104
else
printerror ignoring policy-rc.d fallback request: ${printaction}.
RC=101
fi
else
printerror ignoring policy-rc.d fallback request: ${printaction}.
RC=104
fi
;;
esac
fi
case ${RC} in
100|101|102|103|104|105|106) ;;
*) printerror WARNING: policy-rc.d returned unexpected error status ${RC}, 102 used instead.
RC=102
;;
esac
else
if test ! -e "/sbin/init" ; then
if test x${FORCE} != x ; then
printerror "WARNING: No init system and policy-rc.d missing, but force specified so proceeding."
else
printerror "WARNING: No init system and policy-rc.d missing! Defaulting to block."
RC=101
fi
fi
if test x${RC} = x ; then
RC=104
fi
fi
return
}
verifyparameter () {
#
# Verifies if $1 is not null, and $# = 1
#
if test $# -eq 0 ; then
printerror syntax error: invalid empty parameter
exit 103
elif test $# -ne 1 ; then
printerror syntax error: embedded blanks are not allowed in \"$*\"
exit 103
fi
return
}
##
## main
##
## Verifies command line arguments
if test $# -eq 0 ; then
printerror syntax error: missing required parameter, --help assumed
dohelp
exit 103
fi
state=I
while test $# -gt 0 && test ${state} != III ; do
case "$1" in
--help) dohelp
exit 0
;;
--quiet) BEQUIET=--quiet
;;
--force) FORCE=yes
RETRY=yes
;;
--try-anyway)
RETRY=yes
;;
--disclose-deny)
RETURNFAILURE=yes
;;
--query) MODE=query
RETURNFAILURE=yes
;;
--no-fallback)
NOFALLBACK=yes
;;
--skip-systemd-native) SKIP_SYSTEMD_NATIVE=yes
;;
--*) printerror syntax error: unknown option \"$1\"
exit 103
;;
*) case ${state} in
I) verifyparameter $1
INITSCRIPTID=$1
;;
II) verifyparameter $1
ACTION=$1
;;
esac
state=${state}I
;;
esac
shift
done
if test ${state} != III ; then
printerror syntax error: missing required parameter
exit 103
fi
#NOTE: It may not be obvious, but "$@" from this point on must expand
#to the extra initscript parameters, except inside functions.
if test -d /run/systemd/system ; then
is_systemd=1
UNIT="${INITSCRIPTID%.sh}.service"
elif test -f /run/openrc/softlevel ; then
is_openrc=1
elif test ! -f "${INITDPREFIX}${INITSCRIPTID}" ; then
## Verifies if the given initscript ID is known
## For sysvinit, this error is critical
printerror unknown initscript, ${INITDPREFIX}${INITSCRIPTID} not found.
fi
## Queries sysvinit for the current runlevel
if [ ! -x ${RUNLEVELHELPER} ] || ! RL=`${RUNLEVELHELPER}`; then
if [ -n "$is_systemd" ] && systemctl is-active --quiet sysinit.target; then
# under systemd, the [2345] runlevels are only set upon reaching them;
# if we are past sysinit.target (roughly equivalent to rcS), consider
# this as runlevel 5 (this is only being used for validating rcN.d
# symlinks, so the precise value does not matter much)
RL=5
else
printerror "could not determine current runlevel"
# this usually fails in schroots etc., ignore failure (#823611)
RL=
fi
fi
# strip off previous runlevel
RL=${RL#* }
## Running ${RUNLEVELHELPER} to get current runlevel do not work in
## the boot runlevel (scripts in /etc/rcS.d/), as /var/run/utmp
## contains runlevel 0 or 6 (written at shutdown) at that point.
if test x${RL} = x0 || test x${RL} = x6 ; then
if ps -fp 1 | grep -q 'init boot' ; then
RL=S
fi
fi
## Handles shutdown sequences VERY safely
## i.e.: forget about policy, and do all we can to run the script.
## BTW, why the heck are we being run in a shutdown runlevel?!
if test x${RL} = x0 || test x${RL} = x6 ; then
FORCE=yes
RETRY=yes
POLICYHELPER=
BEQUIET=
printerror "-----------------------------------------------------"
printerror "WARNING: 'invoke-rc.d ${INITSCRIPTID} ${ACTION}' called"
printerror "during shutdown sequence."
printerror "enabling safe mode: initscript policy layer disabled"
printerror "-----------------------------------------------------"
fi
## Verifies the existance of proper S??initscriptID and K??initscriptID
## *links* in the proper /etc/rc?.d/ directory
verifyrclink () {
#
# verifies if parameters are non-dangling symlinks
# all parameters are verified
#
doexit=
while test $# -gt 0 ; do
if test ! -L "$1" ; then
printerror not a symlink: $1
doexit=102
fi
if test ! -f "$1" ; then
printerror dangling symlink: $1
doexit=102
fi
shift
done
if test x${doexit} != x && test x${RETRY} = x; then
exit ${doexit}
fi
return 0
}
testexec () {
#
# returns true if any of the parameters is
# executable (after following links)
#
while test $# -gt 0 ; do
if test -x "$1" ; then
return 0
fi
shift
done
return 1
}
RC=
###
### LOCAL POLICY: Enforce that the script/unit is enabled. For SysV init
### scripts, this needs a start entry in either runlevel S or current runlevel
### to allow start or restart.
if [ -n "$is_systemd" ]; then
case ${ACTION} in
start|restart|try-restart)
# If a package ships both init script and systemd service file, the
# systemd unit will not be enabled by the time invoke-rc.d is called
# (with current debhelper sequence). This would make systemctl is-enabled
# report the wrong status, and then the service would not be started.
# This check cannot be removed as long as we support not passing --skip-systemd-native
if systemctl --quiet is-enabled "${UNIT}" 2>/dev/null || \
ls ${RCDPREFIX}[S2345].d/S[0-9][0-9]${INITSCRIPTID} >/dev/null 2>&1; then
RC=104
elif systemctl --quiet is-active "${UNIT}" 2>/dev/null; then
RC=104
else
RC=101
fi
;;
esac
else
# we do handle multiple links per runlevel
# but we don't handle embedded blanks in link names :-(
if test x${RL} != x ; then
SLINK=`ls -d -Q ${RCDPREFIX}${RL}.d/S[0-9][0-9]${INITSCRIPTID} 2>/dev/null | xargs`
KLINK=`ls -d -Q ${RCDPREFIX}${RL}.d/K[0-9][0-9]${INITSCRIPTID} 2>/dev/null | xargs`
SSLINK=`ls -d -Q ${RCDPREFIX}S.d/S[0-9][0-9]${INITSCRIPTID} 2>/dev/null | xargs`
verifyrclink ${SLINK} ${KLINK} ${SSLINK}
fi
case ${ACTION} in
start|restart|try-restart)
if testexec ${SLINK} ; then
RC=104
elif testexec ${KLINK} ; then
RC=101
elif testexec ${SSLINK} ; then
RC=104
else
RC=101
fi
;;
esac
fi
# test if /etc/init.d/initscript is actually executable
_executable=
if [ -n "$is_systemd" ]; then
_executable=1
elif testexec "${INITDPREFIX}${INITSCRIPTID}"; then
_executable=1
fi
if [ "$_executable" = "1" ]; then
if test x${RC} = x && test x${MODE} = xquery ; then
RC=105
fi
# call policy layer
querypolicy
case ${RC} in
101|104)
;;
*) if test x${MODE} != xquery ; then
printerror policy-rc.d returned error status ${RC}
if test x${RETRY} = x ; then
exit ${RC}
else
RC=102
fi
fi
;;
esac
else
###
### LOCAL INITSCRIPT POLICY: non-executable initscript; deny exec.
### (this is common sense, actually :^P )
###
RC=101
fi
## Handles --query
if test x${MODE} = xquery ; then
exit ${RC}
fi
setechoactions () {
if test $# -gt 1 ; then
echoaction=true
else
echoaction=
fi
}
getnextaction () {
saction=$1
shift
ACTION="$@"
}
## Executes initscript
## note that $ACTION is a space-separated list of actions
## to be attempted in order until one suceeds.
if test x${FORCE} != x || test ${RC} -eq 104 ; then
if [ -n "$is_systemd" ] || testexec "${INITDPREFIX}${INITSCRIPTID}" ; then
RC=102
setechoactions ${ACTION}
while test ! -z "${ACTION}" ; do
getnextaction ${ACTION}
if test ! -z ${echoaction} ; then
printerror executing initscript action \"${saction}\"...
fi
if [ -n "$is_systemd" ]; then
if [ -n "$DPKG_MAINTSCRIPT_PACKAGE" ]; then
# If we are called by a maintainer script, chances are good that a
# new or updated sysv init script was installed. Reload daemon to
# pick up any changes.
systemctl daemon-reload
fi
if [ "$SKIP_SYSTEMD_NATIVE" = yes ] ; then
case $(systemctl show --value --property SourcePath "${UNIT}") in
/etc/init.d/*)
;;
*)
# We were asked to skip native systemd units, and this one was not generated by the sysv generator
# exit cleanly
exit 0
;;
esac
fi
_state=$(systemctl -p LoadState show "${UNIT}" 2>/dev/null)
# avoid deadlocks during bootup and shutdown from units/hooks
# which call "invoke-rc.d service reload" and similar, since
# the synchronous wait plus systemd's normal behaviour of
# transactionally processing all dependencies first easily
# causes dependency loops
if ! systemctl --quiet is-active multi-user.target; then
sctl_args="--job-mode=ignore-dependencies"
fi
case $saction in
start|restart|try-restart)
[ "$_state" != "LoadState=masked" ] || exit 0
systemctl $sctl_args "${saction}" "${UNIT}" && exit 0
;;
stop|status)
systemctl $sctl_args "${saction}" "${UNIT}" && exit 0
;;
reload)
[ "$_state" != "LoadState=masked" ] || exit 0
_canreload="$(systemctl -p CanReload show ${UNIT} 2>/dev/null)"
if [ "$_canreload" = "CanReload=no" ]; then
"${INITDPREFIX}${INITSCRIPTID}" "${saction}" "$@" && exit 0
else
systemctl $sctl_args reload "${UNIT}" && exit 0
fi
;;
force-stop)
systemctl --signal=KILL kill "${UNIT}" && exit 0
;;
force-reload)
[ "$_state" != "LoadState=masked" ] || exit 0
_canreload="$(systemctl -p CanReload show ${UNIT} 2>/dev/null)"
if [ "$_canreload" = "CanReload=no" ]; then
systemctl $sctl_args restart "${UNIT}" && exit 0
else
systemctl $sctl_args reload "${UNIT}" && exit 0
fi
;;
*)
# We try to run non-standard actions by running
# the init script directly.
"${INITDPREFIX}${INITSCRIPTID}" "${saction}" "$@" && exit 0
;;
esac
elif [ -n "$is_openrc" ]; then
rc-service "${INITSCRIPTID}" "${saction}" && exit 0
else
"${INITDPREFIX}${INITSCRIPTID}" "${saction}" "$@" && exit 0
fi
RC=$?
if test ! -z "${ACTION}" ; then
printerror action \"${saction}\" failed, trying next action...
fi
done
printerror initscript ${INITSCRIPTID}, action \"${saction}\" failed.
if [ -n "$is_systemd" ] && [ "$saction" = start -o "$saction" = restart -o "$saction" = "try-restart" ]; then
systemctl status --full --no-pager "${UNIT}" || true
fi
exit ${RC}
fi
exit 102
fi
## Handles --disclose-deny and denied "status" action (bug #381497)
if test ${RC} -eq 101 && test x${RETURNFAILURE} = x ; then
if test "x${ACTION%% *}" = "xstatus"; then
printerror emulating initscript action \"status\", returning \"unknown\"
RC=4
else
RC=0
fi
else
formataction ${ACTION}
printerror initscript ${naction} \"${printaction}\" not executed.
fi
exit ${RC}
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