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diff --git a/man8/invoke-rc.d.rst b/man8/invoke-rc.d.rst new file mode 100644 index 0000000..fc21a73 --- /dev/null +++ b/man8/invoke-rc.d.rst @@ -0,0 +1,223 @@ +=================== + invoke-rc.d +=================== + +--------------------------------------------------------- +executes System-V style init script actions +--------------------------------------------------------- + +:Manual section: 8 +:Manual group: Debian GNU/Linux +:Author: + Henrique de Moraes Holschuh + +:Version: 1 March 2001 +:Copyright: 2001 Henrique de Moraes Holschuh +:License: GNU General Public License v2 or Later (GPLv2+) + +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. + +SEE ALSO +======== + +| *Debian Policy manual*, +| ``/etc/init.d/skeleton``, +| ``update-rc.d``\(8\), +| ``init``\(8\), +| ``/usr/share/doc/init-system-helpers/README.policy-rc.d.gz`` |