Ubuntu Manpage: invoke-rc.d - executes System-V style init script actions

Provided by: init-system-helpers_1.62_all

NAME

       invoke-rc.d - executes System-V style init script actions

SYNOPSIS

       invoke-rc.d [--quiet] [--force] [--try-anyway] [--disclose-deny] [--query] [--no-fallback]
       name action [init script parameters...]

       invoke-rc.d [--help]

DESCRIPTION

       invoke-rc.d is a generic interface to execute System V style init script  /etc/init.d/name
       actions,  obeying  runlevel  constraints  as  well as any local policies set by the system
       administrator.

       All access to the init scripts by Debian  packages'  maintainer  scripts  should  be  done
       through invoke-rc.d.

       This  manpage  documents  only the usage and behavior of invoke-rc.d.  For a discussion of
       the System V style init script arrangements  please  see  init(8).   More  information  on
       invoke-rc.d  can  be  found  in  the section on runlevels and init.d scripts of the Debian
       Policy Manual.

INIT SCRIPT ACTIONS

       The  standard  actions  are:  start,  stop,  force-stop,  restart,  try-restart,   reload,
       force-reload,  and  status.   Other  actions  are accepted, but they can cause problems to
       policy-rc.d (see the INIT SCRIPT POLICY section), so warnings are generated if the  policy
       layer is active.

       Please  note  that  not  all init scripts will implement all the actions listed above, and
       that the policy layer may override an action to another action(s), or even deny it.

       Any extra parameters will be passed to the init script(s) being executed.

       If an action must be carried out regardless of any local policies, use the --force switch.

OPTIONS

       --help Display usage help.

       --quiet
              Quiet mode, no error messages are generated.

       --force
              Tries to run the init script regardless of policy and init script subsystem errors.
              Use of this option in Debian maintainer scripts is severely discouraged.

       --try-anyway
              Tries to run the init script if a non-fatal error is detected.

       --disclose-deny
              Return status code 101 instead of status code 0 if the init script action is denied
              by the policy layer.

       --query
              Returns one of the status codes 100-106. Does not run the init script, and  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(1p)

STATUS CODES

Should an init script be executed, invoke-rc.d always returns the status code returned by
the init script. Init scripts should not return status codes in the 100+ range (which is
reserved in Debian and by the LSB). The status codes returned by invoke-rc.d proper are:

0 Success. Either the init script was run and returned exit status 0 (note that a
fallback action may have been run instead of the one given in the command line), or
it was not run because of runlevel/local policy constrains and --disclose-deny is
not in effect.

1 - 99 Reserved for init.d script, usually indicates a failure.

100 Init script ID (name) unknown. This means the init script was not registered
successfully through update-rc.d or that the init script does not exist.

101 Action not allowed. The requested action will not be performed because of runlevel
or local policy constraints.

102 Subsystem error. Init script (or policy layer) subsystem malfunction. Also, forced
init script execution due to --try-anyway or --force failed.

103 Syntax error.

104 Action allowed. Init script would be run, but --query is in effect.

105 Behavior uncertain. It cannot be determined if action should be carried out or
not, and --query is in effect.

106 Fallback action requested. The policy layer denied the requested action, and
supplied an allowed fallback action to be used instead.

INIT SCRIPT POLICY

       invoke-rc.d introduces the concept of a policy layer which is used to verify  if  an  init
       script  should be run or not, or if something else should be done instead.  This layer has
       various uses, the most immediate ones being avoiding that package upgrades  start  daemons
       out-of-runlevel, and that a package starts or stops daemons while inside a chroot jail.

       The  policy layer has the following abilities: deny or approve the execution of an action;
       request that another action (called a fallback) is to be  taken,  instead  of  the  action
       requested in invoke-rc.d's command line; or request multiple actions to be tried in order,
       until one of them succeeds (a multiple fallback).

       invoke-rc.d itself only pays attention to the current runlevel; it will block any attempts
       to  start  a  service  in a runlevel in which the service is disabled.  Other policies are
       implemented  with  the  use  of  the  policy-rc.d  helper,  and  are  only  available   if
       /usr/sbin/policy-rc.d is installed in the system.

FILES

       /etc/init.d/*
              System V init scripts.

       /usr/sbin/policy-rc.d
              Init script policy layer helper (not required).

       /etc/rc?.d/*
              System V runlevel configuration.

NOTES

       invoke-rc.d  special  cases  the  status action, and returns exit status 4 instead of exit
       status 0 when it is denied.

BUGS

       See http://bugs.debian.org/sysv-rc and http://bugs.debian.org/init-system-helpers.

AUTHOR

       Henrique de Moraes Holschuh

       License: GNU General Public License v2 or Later (GPLv2+)

COPYRIGHT

       2001 Henrique de Moraes Holschuh