Re: initscripts: using "/etc/init.d/<package>"

["Eugene V. Lyubimkin" <jackyf.devel@gmail.com>]

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Russ Allbery wrote:
> "Eugene V. Lyubimkin" <jackyf.devel@gmail.com> writes:
> 
>> "The package maintainer scripts must use invoke-rc.d to invoke the
>> /etc/init.d/* initscripts, instead of calling them directly."
>>
>> Then, but, it say:
>>
>> "Most packages will simply need to change:
>>      /etc/init.d/<package>
>>              <action>
>>
>> in their postinst and prerm scripts to:
>>
>>       if which invoke-rc.d >/dev/null 2>&1; then
>>       invoke-rc.d package <action>
>>       else
>>       /etc/init.d/package <action>
>>       fi
>> "
>> ... which is fallback to using /etc/init.d directly if 'invoke-rc.d' is
>> missing. But, how it can be? The package 'sysv-rc' that contains
>> 'invoke-rc.d' has 'required' priority.
> 
> Required priority doesn't mean that you can assume the package is always
> there.  You still have to declare explicit dependencies or fall back if
> it's not unless the package is marked essential, which sysv-rc is not.
> 
Ok, thanks for explanation.
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