invoke-rc.d - executes System-V style init script actions
[init script parameters...
is a generic interface to execute System V style init script
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
and the dpkg programmers' manual
. 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
, and status
actions are accepted, but they can cause problems to policy-rc.d
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 init script parameters will be passed to the init script(s) being
If an action must be carried out regardless of any local policies, use the
- Display usage help.
- Quiet mode, no error messages are generated.
- Tries to run the init script regardless of policy and init script
subsystem errors. Use of this option in Debian maintainer scripts is
- Tries to run the init script if a non-fatal error is detected.
- Return status code 101 instead of status code 0 if the init script action
is denied by the policy layer.
- Returns one of the status codes 100-106. Does not run the init script, and
implies --disclose-deny and --no-fallback.
- Ignores any fallback action requests by the policy layer. Warning:
this is usually a very bad idea for any actions other than
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:
- 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.
- 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.
- Action not allowed. The requested action will not be performed
because of runlevel or local policy constraints.
- Subsystem error. Init script (or policy layer) subsystem
malfunction. Also, forced init script execution due to --try-anyway
or --force failed.
- Syntax error.
- Action allowed. Init script would be run, but --query is in
- Behavior uncertain. It cannot be determined if action should be
carried out or not, and --query is in effect.
- Fallback action requested. The policy layer denied the requested
action, and supplied an allowed fallback action to be used instead.
INIT SCRIPT POLICY¶
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
itself will only pay attention to the current runlevel, and
block any tries to start an init script in a runlevel it is not configured to
be started at. Other policies are implemented with the use of the
helper, and are only available if
is installed in the system.
- System V init scripts.
- Init script policy layer helper (not required).
- file-rc runlevel configuration.
Please report any bugs using the Debian bug tracking system,
dpkg programmers manual